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MC34216A
Advance Information Programmable Telephone Line Interface Circuit with Loudspeaker Amplifier
The MC34216A is developed for use in telephone applications where, besides the standard telephone functions, the group listening-in feature is also required. In cooperation with a microcontroller, the circuit performs all basic telephone functions including DTMF generation and pulse-dialing. The listening-in part includes a loudspeaker amplifier, an anti-howling circuit and a strong supply. In combination with the TCA3385, the ringing is performed via the loudspeaker. * Programmable DC Mask, for France, U.K., and Voltage Regulated Countries * DC Mask for France and U.K. (MC34216ADWF)
PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER
SEMICONDUCTOR TECHNICAL DATA
28
1
* * * * * *
Programmable Volume for Listening-In and Ringing Small Amount of External Components On-Chip DTMF and Ring Signal Generator Efficient Supply Point for Loudspeaker Amplifier and Peripherals Programmable Modes for Speakerphone, Answering Machine, Fax and Modem Applications Pilot and Idle Tones Provide Extra Phone Features
DW, DWF SUFFIX PLASTIC PACKAGE CASE 751F
PIN CONNECTIONS
AHO1 AHO2 MTF MTC
1 2 3 4 5 6 7 8 9
28 AGC 27 RXO2 26 RXO1 25 RXI 24 LPI 23 LPO 22 Gnd 21 VCC 20 Iref 19 RS 18 Clk 17 D/HS 16 Osc 15 SAI (Top View)
Simplified Block Diagram
Line + DC and AC Termination
AGnd TXI Mic LAO LAI
Handset Earpiece Handset MIcrophone
Ear
DC Mask Generation AC Termination 2-4 Wire Conversion
Supply Stabilizer Line Driver
HYN 10 NDC 11 CM 12 IMP 13 SAO 14
Mic Anti- Howling
Base Loudspeaker
LSP
DTMF and Ring Generator
Microcontroller Interface
ORDERING INFORMATION
Line - Device MC34216ADW MC34216ADWF
(c) Motorola, Inc. 1996
Operating Temperature Range TA = 0 to +70C
Package SO-28L SO-28L
This device contains 6,507 active transistors.
This document contains information on a new product. Specifications and information herein are subject to change without notice.
MOTOROLA ANALOG IC DEVICE DATA
1
MC34216A
FEATURES
Line Driver and Supply * DC and AC Termination of the Line
* * * * * * * * * * * * * * * * * * * * * * *
Programmable DC Mask: France, U.K., Startup, Low Voltage (MC34216ADW) Programmable DC Mask: France, U.K., Startup (MC34216ADWF) Current Protection Adjustable Set Impedance for Resistive and Complex Termination Efficient Supply Point for Loudspeaker Amplifier and Peripherals
Handset Operation * Transmit and Receive Amplifiers Adjustable Sidetone Network Line Length AGC Microphone and Earpiece Mute Earpiece Gain Increase Switch Microphone Squelch Function Transmit Amplifier Soft Clipping
Dialing and Ringing * Generates DTMF, Pilot Tones and Ring Signal Interrupter Driver for Pulse-Dialing Low Current While Pulse-Dialing Optimized for Ringing via Loudspeaker Programmable Ring Melodies Uses Inexpensive 500 kHz Resonator
Loudspeaking Facility * Integrated Loudspeaker Amplifier Peak-to-Peak Limiter Prevents Distortion Programmable Volume Anti-Howling Circuitry for Group Listening-In Interfacing for Handsfree Conversation
Application Areas * Corded Telephony with Group Listening-In Cordless Telephony Base Station with Group Listening-In Telephones with Answering Machines Fax, Intercom, Modem
MAXIMUM RATINGS
Rating Maximum Junction Temperature Storage Temperature Range Symbol TJ Tstg Min - - 65 Max +150 +150 Unit C C
NOTES: 1. Devices should not be operated at or outside these values. The "Recommended Operating Limits" provide for actual device operation. 2. ESD data available upon request.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAA A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A
RECOMMENDED OPERATING CONDITIONS
Characteristic Oscillator Frequency @ Pin 16 Operating Temperature Range Symbol fosc TA Min 495 0 Typ 500 - Max 505 Unit kHz C +70
2
MOTOROLA ANALOG IC DEVICE DATA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A
SPEECH AMPLIFIERS LOGIC PINS Voltage at IMP (Pin 13) VO1 Follower (I2 = 0 A) VO1 - VO2 LAO (Pin 8) Maximum Current (Source) Maximum Current (Sink) Voltage (LD = 1, I = 100 A) Driver A8 Slope Microphone Amplifier Bias Voltage @ TXI (Pin 6) Voltage at MIC @ 1.0 mA ( MicP = 1) Leakage @ MIC @ 4.5 V (MicP = 0) Bias Voltage at HYN (Pin 10) Normal Mode Bit (LD = 1) AHO2 (Pin 2) AHO1 (Pin 1) Normal Mode (HPI = 0) Supervision Mode (HPI = 1) Loudspeaker Amplifier LPI, Pin 24 LPO, Pin 23 Earpiece Amplifier DC Bias RXI, Pin 25 RXO1, Pin 26 RXO2, Pin 27 RXO1 - RXO2 Offset Reset Output (Pin 19) VCC < 3.0 V VCC > 3.25 V Hysteresis Hook Status Output (Pin 17) Off-Hook, Iout = - 200 A On-Hook, Iout = 200 A Bit LD = 1, Iout = - 200 A Reference Current @ Pin 20 Regulated Supply in Protection Mode, ICC = 30 mA Current Consumption at Pin 21, Bit LD = Hi Regulated Supply at Pin 21 Startup Mode ICC = 10 mA ICC = 100 mA France and U.K. ICC = 10 mA ICC = 50 mA Low Voltage Mode (MC34216ADW Only) ICC = 10 mA ICC = 100 mA VCC = 3.5 (MicM = 0)
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A
VOLTAGE REGULATOR
DC ELECTRICAL CHARACTERISTICS (TA = 25C)
MOTOROLA ANALOG IC DEVICE DATA Normal Mode (MicM = 1)
Characteristic
MC34216A
VHYN VHYN-LD
Vres(on) Vres(off) Vres(hys)
VAHO21 VAHO22
VAHO11 VAHO12
Symbol
VRXI VRXO1 VRXO2 Voffset
VHSO1 VHSO2 VHSO3
ICC LD
VLAO S8
VLPI VLPO
VCC5
VCC3
VCC2
VCC1
VIMP
VTXI VMic Ileak
VO1 VO
Iref
I8 I8
VCC - 1.0 - VCC - 1.0
1.15 -
1.15 2.2
15.3
4.30
3.60 3.75
4.25 4.30
4.25 4.40
Min
- 110 - 1.6
2.2
1.1 40
1.7 - -
2.4 1.4
1.9 1.9
1.7 1.7 1.7 -
- 3.0 -
-
-150 150 - 2.1
1.18 80
- - 0.05
16.3
3.90 4.05
4.50 4.55
4.50 4.65
Typ
1.2
-
- - -
- -
- -
- -
- -
- - - -
- - -
-
0.40 VCC - 0.1 -
-110 - 350 2.6
2.0 0.35 5.5
1.65 0.20
1.65 2.8
17.3
4.80
4.20 4.35
4.75 4.85
4.75 4.90
Max
1.3 120
2.5
2.7 1.7
2.5 2.5
2.3 2.5 2.5 0.4
- 0.4 -
-
mV A/mV
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
V mV
mA
A
A
A
3
MC34216A
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A
Characteristic Symbol Min Typ Max Unit DC MASK CHARACTERISTICS Startup Mode Internal Slope Voltage on SAI (I2C = 5.9 A) Voltage on SAI (I2D = 7.1 A) Delta Offset Voltage on SAI (I2E = 38 A) French Internal Slope Voltage on SAI (I2C = 5.9 A) Voltage on SAI (I2D = 7.1 A) Delta Offset Voltage on SAI (I2E = 38 A) U.K. Internal Slope Voltage on SAI (I2C = 5.9 A) Voltage on SAI (I2D = 7.1 A) Delta Offset Voltage on SAI (I2E = 38 A) Low Voltage Mode (MC34216ADW Only) Internal Slope Voltage on SAI (I2C = 15 A) Voltage on SAI (I2D = 17 A) Delta Offset Voltage on SAI (I2E = 20 A) ri VC VD VE - VD ri VC VD VE - VD ri VC VD VE - VD ri VC VD VE - VD 300 800 - - 76 280 - - 120 420 - - 95 900 - - 485 370 380 - - - 103 - - - 165 - - - 129 - - - 550 410 460 - 1.5 100 130 - 460 30 210 - 675 40 165 - 1.5 100 615 450 mV/A mV V mV mV/A mV mV/A mV mV/A mV Vdc mV mV mV Overvoltage Protection Threshold (VLAI - VSAO) Iprot = 60 A, ICC = 70 mA Protection Voltage Level (VLAI - VSAO) Iprot = 60 A Vclamp1 Vclamp2
DC ELECTRICAL CHARACTERISTICS (continued) (TA = 25C)
AC ELECTRICAL CHARACTERISTICS (TA = 25C)
Characteristic TRANSMIT MODE
Symbol
Min
Typ
Max
Unit
French and U.K. Maximum Transmit Gain (I2 = 5.6 A) Line Length Regulation (I2 = 27.5 A) Gain in Protection Mode (I2 = 29.5 A)
dB
K0 K Kp K0 K Kp
13.5 5.0 13.5 13.5 4.7 13.5 60
14.5 6.0 14.5 14.5 6.0 14.5 -
15.5 7.0 15.5 15.5 7.3 15.5 -
Low Voltage Mode (MC34216ADW Only) Maximum Transmit Gain (I2 = 3.5 A) Line Length Regulation (I2 = 7.7 A) Gain in Protection Mode (I2 = 7.7 A)
dB
Gain Reduction when Microphone is Muted
Kmute
dB
RECEIVE MODE
French Maximum Internal Transconductance (I2 = 5.6 A) Line Length Regulation (I2 = 26 A) Protection Mode (I2 = 26 A) U.K. Maximum Internal Transconductance (I2 = 5.6 A) Line Length Regulation (I2 = 26 A) Protection Mode (I2 = 26 A) Low Voltage Mode (MC34216ADW Only) Maximum Internal Transconductance (I2 = 3.5 A) Line Length Regulation (I2 = 7.9 A) Protection Mode (I2 = 7.9 A) Earpiece Gain Reduction when Muted
Ge0 Ge Gep Ge0 Ge Gep Ge0 Ge Gep
203 5.0 203 203 5.0 203 183 4.7 183 60
230 6.0 230 230 6.0 230 210 6.0 210 -
258 7.0 258 258 7.0 258 241 7.3 241 -
A/V dB A/V A/V dB A/V A/V dB A/V dB dB
Ge mute Ge1
Earpiece Gain Variation (EA Bit Changed to 1)
4.6
5.6
6.6
4
MOTOROLA ANALOG IC DEVICE DATA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A
ANTI-HOWLING MONITORING RECEIVE GAIN PEAK-TO-PEAK AGC (RLS = 25 , C25 = 220 nF, G0 = G1 = G2 = 1, ICC = 40 mA) LINE CURRENT AGC ( RLS = 25 , G0 = G1 = G2 = 1, VLS = 2.0 Vpp, French, U.K., and LV Masks)
OTHER ELECTRICAL CHARACTERISTICS (TA = 25C)
NOTE: VE is the differential earpiece voltage across Pins 26 and 27.
DISTORTION
RECEIVE PABX MODE
TRANSMIT PABX MODE
AC ELECTRICAL CHARACTERISTICS (continued) (TA = 25C)
MOTOROLA ANALOG IC DEVICE DATA
Attenuation Step Internal Resistor RT Muted (G2, G1, G0 = 000) Maximum Gain (G2, G1, G0 = 111) 1 Step AGC Gain Variation (LSB) AGC Lower Threshold France and U.K. Low Voltage (MC34216ADW Only) AGC Upper Threshold France and U.K. Low Voltage (MC34216ADW Only) DC Level at Pin 28 AGC "Off" AGC "On" Line Current for which AGC is Inactive VCC with Current AGC "On" (ICC = 13 mA) Line Current for which AGC is Active Low Voltage (MC34216ADW Only) French and U.K. French Low Voltage Mode (MC34216ADW Only) Internal Transconductance (I2 = 2.0 A) Variation with Line Length (I2 = 20 A) Variation with Line Current (ICC = 16 mA) Variation with Line Current (ICC = 7.0 mA) U.K. Internal Transconductance (I2 = 2.0 A) Variation with Line Length (I2 = 27 A) French Internal Transconductance (I2 = 2.0 A) Variation with Line Length (I2 = 27 A) Low Voltage Mode (MC34216ADW Only) Transmit Gain (I2 = 2.0 A) Variation with Line Length (I2 = 20 A) Variation with Line Current (ICC = 16 mA) Variation with Line Current (ICC = 7.0 mA) French and U.K. Transmit Gain (I2 = 2.0 A) Variation with Line Length (I2 = 27 A) Characteristic Characteristic
Transmit (I2 = 10-20 A) Receive VE = 700 mV (I2 = 20 A) VE = 1350 mV
Transmit (I2 = 10-30 A) Receive VE = 700 mV (I2 = 10 A) VE = 1350 mV
MC34216A
VCC AGC
VAGC(off) VAGC(on)
IAGC(on)
IAGC(off)
VLS(low)
VLS(up)
Symbol
GPABX GPABX GPABX1 GPABX2
KPABX KPABX KPABX1 KPABX2
GPABX GPABX
GPABX GPABX
RT000 RT111
KPABX KPABX
AGC
GLS
Symbol
THDT THDR
THDT THDR
VCC - 5.0%
VCC - 1.9 0.72
VCC - 1.2 0.85
Min
3.5
1.0
1.6 1.2
- 40
21
-
152 -0.5 -0.5 -2.0
157 -0.5
157 -0.5
11.5 -0.5 -0.5 -2.0
11.4 -0.5
Min
- - -
- - -
VCC - 1.6 0.85
VCC - 1.0 1.0
VCC
1.25
Typ
4.5
1.7 1.3
10 60
-
-
12.5 - 0 0
12.5 -
Typ
175 - - -
180 -
180 -
- - -
- - -
1.50
Max
5.5
1.8 1.5
Max
13.6 0.5 0.5 2.0
13.6 0.5
18 80
19
200 0.5 0.5 2.0
207 0.5
207 0.5
3.0 3.0 5.0
3.0 3.0 5.0
- -
- -
-
-
Vrms
Vrms
A/V dB
A/V dB
A/V dB
Unit
Unit
Vdc
Vdc
mA
mA
k
dB
dB
dB
dB
%
%
5
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NOTE: In low voltage mode, above levels must be reduced by 0.5 dB.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA
OTHER ELECTRICAL CHARACTERISTICS (continued) (TA = 25C)
MONITORING SIGNAL IN LOUDSPEAKER (R/S = 0, G2, G1, G0 = 111) SPEAKERPHONE MODE (G2, G1, G0 = 111, Sp Bit = 1) MICROPHONE THRESHOLD RINGING MODE REGULATION Speakerphone Gain DC Level on Pin 1 LS Gain Variation (Mth(on)/Mth(off)) Iu = 33 nA Iu = 110 nA Transmit Gain Variation (Mth(on)/Mth(off)) Iu = 33 nA Iu = 110 nA Minimum VCC Peak Current @ VCC = 4.2 V Ringing Regulator Slope Current Consumption @ VCC = 3.4 V, RLS = Regulated VCC (RLS = , ICC = 10 mA) Characteristic
DTMF LEVELS
IDLE TONE ON LINE
MONITORING SIGNAL IN EARPIECE (Single Ended)
Level on LAI (Pin 9, ICC = 20 to 70 mA, French and U.K. Masks) MFO123 = 1111, High Frequency Group MFO123 = 0111, High Frequency Group MFO123 = 0000, Low Frequency Group
6
High/Low Frequency Pre-Emphasis Step Size Idle Tone Level (MFC01 = 11, MFO123 = 000) Idle Tone (IT = 1) Pilot Tone (PT = 1) DTMF Level Low Frequency High Frequency Ring Tone (RT = 1) SP = 0 SP = 1 Idle Tone (IT = 1) SP = 0 SP = 1 Pilot Tone (PT = 1) SP = 0 SP = 1 DTMF Level SP = 0 Low Frequency High Frequency SP = 1 Low Frequency High Frequency
MC34216A
IIDLE(step)
GLSmth1 GLSmth2
IDTMF15 IDTMF12 IDTMF0
VRXO-L VRXO-H
Kmth1 Kmth2
VRXO-P
VLS-R1 VLS-R2
VLS-L2 VLS-H2
VLS-L1 VLS-H1
VRXO-I
VLS-P1 VLS-P2
Symbol
GDTMF
IR Peak
VAHO1
VLS-I1 VLS-I2
IIDLE0
VCCR
VCC0
Gsp
IcR
gR
1124 988 373
-0.5 -
- -0.5
5.15
Min
400
1.0
2.2
2.0
4.8
30
-
-
-
- -
- -
- -
- -
- -
- -
-
-
MOTOROLA ANALOG IC DEVICE DATA
1336 1175 444 1100 1400 Typ 550 145 700 185 560 700 900 200 250 6.0 8.0 0 7.0 7.0 0 3.8 2.5 6.3 2.0 5.5 62 12 15 32 - 2.0 1586 1397 528 Max 700 2.8 0.5 - - 0.5 3.0 7.8 2.6 5.8 34 - - - - - - - - - - - - - - - - 3.0 A/V Unit Vdc Vdc Vdc mV mV mV mV mV mV mV mA A dB nA nA nA dB dB dB
MC34216A
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAA AA
DTMF FREQUENCIES
Low Group Frequencies Characteristic Min Typ Max Unit Hz Hz Hz Hz Hz Hz Hz Hz DTMF Std 697 770 852 941 % Error -0.09 -0.10 0.14 689.4 761.5 844.7 930.5 696.4 769.2 853.2 939.9 703.4 776.9 861.7 949.3 -0.11 -0.11 0.07 0.16 0.06 High Group Frequencies 1195.6 1207.7 1336.9 1479.3 1634 1219.8 1350.3 1494.1 1650.3 1209 1336 1477 1633 1323.5 1464.5 1617.7
NOTE: Minimum values based on fosc = 495 kHz. Maximum values based on fosc = 505 kHz.
TEMPERATURE SPECIFICATIONS (TA = 65C)
Characteristic DTMF Distortion Level on Pin LAI, Delta Levels (F = Hi Freq - f = 697 Hz) VCC2 in FR Mode @ ICC = 50 mA VCCR @ ICC = 10 mA, RLS = VC on Pin SAI in FR Mode Ri Slope in FR Mode RT111 Resistor on LS in FR Mode K0 in FR Mode Ge0 in FR Mode Reset Off @ VCC = 3.25 V
Symbol DTMFD VCC2 VCCR VC Ri RT111 K0 Ge0 Vresoff
Min - 4.15 5.0 220 65 35 13 170 3.0
Max -27 5.0 6.0 460 155 85 16 270 3.25
Unit dB V V mV k k dB A/V V
PIN FUNCTION DESCRIPTION
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol AHO1 AHO2 MTF MTC AGnd TXI Mic LAO LAI HYN NDC CM IMP SAO SAI Osc D/HS Clk RS Iref Description Anti-Howling Timing, Speakerphone Input Anti-Howling Timing, Low Voltage Line Driver Disable Microphone Threshold Filtering Microphone Threshold Timing Small Signal Ground Microphone Amplifier Input Microphone Bias Current Sink Line Driver Amplifier Output Line Driver Amplifier Input Hybrid Network Input Noise Decoupling DC Mask Signal Filtering Reference Voltage Line Current Sense Amplifier Output Line Current Sense Amplifier Input Oscillator Input. Connect to 500 kHz Resonator Data Input, Hookstatus Output Clock Input Reset Output Reference Current
MOTOROLA ANALOG IC DEVICE DATA
7
MC34216A
PIN FUNCTION DESCRIPTION (continued)
Pin 21 22 23 24 25 26 27 28 Symbol VCC Gnd LPO LPI RXI RXO1 RXO2 AGC Supply Voltage Large Signal Ground Loudspeaker Amplifier Output Loudspeaker Amplifier Input Receive Amplifier Input Receive Amplifier Output Receive Amplifier Output Loudspeaker AGC Timing Description
CIRCUIT DESCRIPTION
Concept With the MC34216A, a microcontroller and a switched mode power supply, a telephone set with listening-in function and ringing via loudspeaker can be built as shown in Figure 1. In off-hook position, the application is in speech mode. The line current flows through transistor T2 and supplies the application at the supply point VCC which is stabilized by the MC34216A. The Vline, Iline characteristic is programmed by the microcontroller and adjusted by the external components Z0, Z1, Z21 and R1 which are in a regulator loop, acting on transistor T2. The ac impedance is generated in a similar way. Handset and loudspeaker can be connected directly to the MC34216A to perform handset and listening-in operation. Via the bus, the microcontroller programs the MC34216A to perform the DTMF/pulse-dialing and supervise the device. The user keyboard has to be connected to the microcontroller. In on-hook position, the SMPS supplies the application in presence of a ringing signal. The microcontroller programs the MC34216A and a ringing melody can be generated via the loudspeaker. The block diagram of the MC34216A (see Figure 2), shows the basic blocks of the device plus the essential external components.
Figure 1. Telephone Concept with MC34216A
Hookswitch
Z1 Z21 A/B
Z0
T2 VCC
Handset
MC34216A
Micro
SMPS
Loudspeaker
R1
Gnd
8
MOTOROLA ANALOG IC DEVICE DATA
MC34216A
Figure 2. Block Diagram of the MC34216A with Essential Components
Line + To IMP To SAI Z1 C17 To IMP C20 RXO1 26 RXO2 R6 Handset Earpiece 27 RXI 25 C5 TXI 6 Mic Mic Handset Microphone C24 7 LPO 23 R30 LPI Speaker 24 R28 C21 Line - 28 AGC C25 To IMP 1 AHO1 2 C26 AHO2 3 C27 MTF C28 4 MTC SAI 15 C29 16 Osc X1 Volume LSP Anti-Howling Microphone Threshold DTMF/Tone and Ring Generator Micro- Interface Clock Hook-Detect Ear Mute, AGC Mute, AGC MC34216A Line Driver LAO 8 RS 19 Clk 18 D/HS 17 R1 To Micro- controller T3 DC Mask Generation AC Termination 2-4 Wire Conversion Line Length AGC Protection Supply- Stabilizer References Ring- Regulator R20 HYN 10 12 C16 CM C12 Z21 LAI 9 IMP 13 20 Z0 NDC SAO 11 14 R12 Iref VCC 21 AGnd 5 Gnd 22 C7
T2
R9
DC CHARACTERISTICS AND STARTUP
Figure 3. General Form of the DC Mask of the MC34216A
V line
4 VLP
adjustments. The software adjustments make it possible to program the 4 different basic masks: France, United Kingdom, Low Voltage and Startup. The hardware adjustments can be used for fine-tuning. The adjustment possibilities will be discussed below with the aid of the block diagram of Figure 4. In Region 1, the transfer of the amplifier G at the HYN input equals zero. The voltage difference between SAO and SAI will equal VO1. The slope RE1 of the Vline, Iline characteristic will equal: R E1 Z0 + R1 x 1 ) Z21
3 VLK 2 VLC 1 Iline 0 ILC ILP ILK IVLP Region 1: Startup, Low Line Current, High Slope Region 2: Mid Range Line Current, Small Slope Region 3: High Line Current, High Slope Region 4: Overload Protection
In Region 2, the output current of the amplifier G will be proportional to the input current. As a result, the voltage between SAO and SAI will increase with the line voltage. Speech signals on the line are of no influence on this because they are filtered out via capacitor C16. The slope RE2 of the Vline, Iline characteristic will equal:
R
E2
+ R1 x 1 ) Ri
1 Z21 Z0 Z1
)
The MC34216A offers the possibility to adjust the dc characteristics of all 4 regions via both software and hardware
In Region 3, the output current of the amplifier G is kept constant. As a result, the slope in Region 3 will equal the slope of Region 1.
MOTOROLA ANALOG IC DEVICE DATA
9
MC34216A
Figure 4. DC Part of the Block Diagram of the MC34216A
Line + C16 Z1 2.4 V CM + 2VBE 1.4 V I2 HYN NDC + C12 RX VO1 SAI Line - MC34216A + VO2 R1 Gnd G + + SAO Z21 LAI + LAO T3 + VCC C7 IMP + Z0 R5 T2
The transfer from Region 2 to 3 occurs at the point VLK, ILK, which is calculated:
+ Z1 x I2CD ) 2VBE ) VCD ) VO2 Z21 x Z1 x I2CD ) 2V ) VCD BE ILK + Z0 R1 With : I2CD + I2C ) I2D , and V + VC ) VD , CD
VLK and 2V BE
When the protection mode is entered, the line current is reduced to a lower value ILP of:
ILP
+
V clamp2
)
V -V O1 O2 R1
[ 1.4 V,
2
V O2
[ 1.1 V
2
When the French or U.K. mask is selected, this transfer takes place for line currents of 30 mA to 40 mA depending on the components settings. With the Startup and Low Voltage mask, the transfer lies outside the normal operating range with line currents of 90 mA or more. In most applications, the transfer from Region 1 to 2 takes place for line currents below 10 mA. With proper settings, Region 4 is only entered during an overload condition. In this mode, the power consumption in the telephone set is limited. In order to detect an overload condition, the voltage between the Pins LAI and SAO is monitored. When the voltage difference is larger than the threshold Vclamp1, the protection is made active. The relation for the line voltage VLP at this point is given as: VLP Z0 + Z21 xV clamp1
When the line voltage becomes smaller than VLP, the overload condition is gone and the MC34216A will leave Region 4. The current drawn from the line by the dc part is used to supply the MC34216A and peripheral circuits. The surplus of current is sunk away by the voltage stabilizer at Pin VCC where a reservoir capacitor is connected. The reference for the circuit is Pin Gnd. Startup of the application is ensured by an internal startup circuit. During the startup, the internal registers of the MC34216A are reset, and the reset Pin RS goes high. This signals is meant to indicate to the microcontroller that the programming of the MC34216A can start. When the line current flows, the hook status output Pin D/HS goes high. This serves as the information for the microcontroller that the set is off-hook. When the line current is no longer present, the pin goes low again. Because the line current is monitored, and not the line voltage, an interrupt of the exchange can be recognized.
) VCD ) VO2
10
MOTOROLA ANALOG IC DEVICE DATA
MC34216A
AC CHARACTERISTICS
Impedance In Figure 5, the block diagram of the MC34216A performing the ac impedance is depicted. As can be seen, it is partly in common with the dc mask block diagram. The part generating the dc mask is replaced by a dc voltage source because for ac, this part has no effect. Figure 5. AC Stage of the MC34216A V
Line + T2
Transmit When on Pin LAI a current is injected, via the loop depicted in Figure 5, a signal is created on the line. In this way, the microphone signals and DTMF signals from the internal generator are transmitted. It can be derived that the signal voltage on the line (Vline) depends on the signal current injected in LAI (ILAI) according to: x + -ILAI x ZZ0 ) ZZline line in
line
Z0 MC34216A LAI Z21 + SAO VO1 SAI R1 Line - + VO2 Gnd + LAO
R5 VCC T3 + C7
With this relation, a simplified replacement circuit can be made for the transmit amplifier (see Figure 7). Here the product of ILAI and Z0 is replaced by one voltage source. Figure 7. Replacement Diagram for the Transmit Amplifier
Zin + + -ILAI*Z0 Vline Zline
-
When calculating the ac loop, it can be derived that the set impedance Zin equals: Z in
+I
V
line
line
+ R1 1 )
Z0 Z21
[
R1 x Z0 Z21
The microphone signal current is derived from the microphone signal according to the schematic in Figure 8. Figure 8. Microphone Amplifier Input Stage
VCC Cmic MC34216A R Mic Line AGC Ru Cu Iu TXI MIC Handset Microphone Microphone Threshold RTXI Ku ILAI
As can be noticed, the formula for the ac impedance Zin equals the formula for the dc slope in Regions 1 and 3. However, because for the dc slopes the resistive part of Z0 and Z21 are used, the actual values for Zin and the dc slopes do not have to be equal. A complex impedance can be made by making either Z0 or Z21 complex. When Z0 is made complex to fit the set impedance, the transmit characteristics will be complex as well. The complex impedance is therefore preferably made via the Z21 network. Because Z21 is in the denominator of the Zin formula, Z21 will not be a direct copy of the required impedance, but a derivative of it. Figure 6 shows the derived network to be used for Z21. Figure 6. Derived Network for Z21 in Case of Complex Set Impedance
Rv SAO Ra Rw Rb Cb Rv LAI
The input stage in Figure 8 consists of a current amplifier with transfer Ku and impedance RTXI = 1.0 k plus an attenuator which reduces the signal current at high line currents, the so-called line length regulated gain or line AGC. This attenuator can be switched on/off via the microcontroller. The input current Iu within the telephony speech band is derived from the microphone signal according to: Iu
Cw Gnd
+R
Vu Vu ) Ru ) RTXI [ Ru Mic
+ 2(Ra R1 x Z0- R1) ) Rb R1 x Z0 (Ra - R1) Rw + 4Rb (Ra ) Rb - R1)
Rv Cw Cb + 4Rb2xxZ0 R1
With: Vu = signal of the microphone only loaded with RMic. The overall gain from microphone to line (ATX) now follows as: A TX line Ku + VVu + Ru Z0 x Z x Z
) Zline in
line 11
Practically, the gain can only be varied with Z0, Ru and RMic.
MOTOROLA ANALOG IC DEVICE DATA
MC34216A
Figure 9. Receive Part of the MC34216A
2.4 V MC34216A IMP + HYN Vref + Ge RXO1 Rload + 2VBE + VO1 SAI Line - R1 Gnd Line AGC RXI Cload + Cear -1 X RXO2
Line +
Z1
R20
C17
Handset Earpiece
The noise which is transmitted to the line can be reduced when the microphone threshold feature is enabled. This is also called squelch. When there is no microphone signal present, the transmit gain is reduced by 7.0 dB with respect to nominal. In between, the gain is varied in steps of 1.0 dB dependent on the signal level. The detection of the microphone signal level is done via an integrator which uses the external capacitors C28 and C29 for timing and filtering. This feature is also very useful to reduce the howling effect during listening-in. The MC34216A offers the possibility to mute the microphone, also called privacy mode. In this case, the far end user no longer hears the local user. It is possible to send during this mode an idle tone to the line to make the far end user aware of this. During pulse-dialing, the microphone biasing can be switched off by programming. Pin Mic will then be made high impedance, meaning that the microphone dc current no longer flows into this pin. This reduces the current consumption of the application during pulse-dialing. It can also be used to disconnect the handset microphone signal and enable another transmit signal, for instance from a handsfree microphone. Receive The receive portion of the MC34216A is shown in Figure 9. The receive signal is picked up by the amplifier at the HYN input. This is the same amplifier as present in the dc loop of Figure 4. The signal is first converted to current by the transconductance amplifier with transfer Ge. The multiplier placed after performs line length dependent gain or line AGC. Afterwards, the current is converted back to voltage via the external feedback network Zload. The resulting voltage is available at output RXO1, and at RXO2 which is the inverted earpiece output. From the diagram of Figure 9 the receive gain (A RX) can be derived as: A RX
The earpiece can either be connected as a single-ended or as a bridge-tied load. The above calculated gain is valid for the single-ended case. When connecting as a bridge-tied load, the gain is increased by 6.0 dB. The MC34216A offers the possibility to increase the receive gain to the earpiece with an extra 6.0 dB via the microcontroller on command of the user of the telephone set. This is useful for people with hearing problems or when the far end user speaks very softly. The MC34216A offers the possibility to mute the signal coming from the line to the earpiece. This is useful during pulse-dialing or to mute the far end user. Sidetone When a transmit signal is transmitted to the line, a part of the signal is returned to the receive channel due to the nature of the 2 to 4 wire conversion of the hybrid. During transmit, the signal on the line will be -Iline x Zline. During receive, the signal on the line will be Iline x Zin. When replacing Zin in the formula for the receive gain, it follows that the signal on the earpiece output due to a sending signal on the line will be: V ear V line-transmit
+ Ge x R1 x Zload x
1- 1 Z Z h line
The sidetone can be minimized by making Zh equal to Zline. A complex sidetone network can therefore be made via a complex Z1. The coupling capacitor C17 in series with R20 is only meant to block dc. Line Length AGC The MC34216A offers the possibility to vary the transmit and receive gains over line length in order to compensate for the loss in gain at longer line lengths. In the block diagrams of the transmit and receive channels the attenuator performing the line AGC is already drawn. The line AGC can be switched on/off via the microcontroller. In case the line AGC is switched off, the transmit and receive gain are lowered 2.0 dB with respect to the value calculated via the formulas above. The line AGC characteristics for both transmit and receive channels have the general shape depicted in Figure 10.
+ VRXO + Ge x R1 x Zload x V
line h x + R1R20Z1 ,
1 Z h
) Z1
in
With : Z
also see the sidetone characteristics below. 12 MOTOROLA ANALOG IC DEVICE DATA
MC34216A
Figure 10. General Line AGC Characteristics
Gain Gain Nominal Gain
+
Nominal Gain
1
)
IL - IL start IL range
The first part of the loudspeaker amplifier equals the receive part of the earphone amplifier. It therefore also includes the anti sidetone circuit and the line current AGC. The overall gain from line to loudspeaker output LPO is therefore: A LSP
+ 1 ) R30 R28
xR
T
x G e x R1 x
1 Z h
) Z1
in
Reduced Gain
Iline IL start IL range
For small line currents, and thus long lines, the gains are nominal. When the line current has increased above IL start with a current ILrange, the gain is reduced by 6.0 dB. Due to the general characteristics of the line AGC curve, the gain will be decreased further for higher currents. For France and the U.K., the line AGC will be active in Region 3 of the dc characteristics. The ILstart is approximately equal to the ILK. The range is determined by: IL range
The gain of the loudspeaker amplifier can be adjusted by the external components as indicated in the formula above. However, the gain is also influenced by line length AGC, volume control and the signal limiter AGC. The influence of line length AGC on the loudspeaker channel is equal to its influence on the receive amplifier of the earpiece because it is in their common path. The volume of the loudspeaker is controlled via the microcontroller. In total, 8 levels can be programmed: 7 levels with equal steps of 4.5 dB and one level which completely mutes the loudspeaker amplifier. The output signal is limited by an AGC circuit when the peaks of the signal are larger than a certain threshold (peak AGC) and when the line current available is not sufficient (current AGC). This prevents distortion of the output signal and a drop of the supply voltage VCC. Listening-In During group listening-in, both the handset and the loudspeaker are active. Via the acoustic coupling from loudspeaker to handset microphone, howling can occur when the handset is held close to the base. In order to reduce howling, an anti-howling correlator and a microphone threshold are incorporated in the MC34216A. Both functions can be switched on/off via the microcontroller. The anti-howling correlator monitors the microphone and loudspeaker signal via capacitors C26 through C29. When both signals show a high correlation, then both contain a common signal. In practice, this means that howling is present. In this case, the anti-howling correlator will reduce the loudspeaker gain in steps of 1.25 dB, until the correlation is below a certain threshold.
+ Z1 x (I2R - I2CD) R
E3
For Low Voltage mask, the line AGC is active in Region 2. Loudspeaking Facility The MC34216A incorporates a loudspeaking facility which facilitates group listening-in with incorporated anti-howling circuitry, handsfree conversation with external duplex controller and ringing via loudspeaker with external switched mode power supply. Loudspeaker Amplifier The block diagram of the loudspeaker amplifier which is incorporated in the MC34216A is depicted in Figure 11.
Figure 11. Block Diagram of the Loudspeaker Amplifier
2.4 V MC34216A IMP HYN + IRX Microphone Volume Threshold Control
Z1 Line +
R20
C17
+
LPO
C24
C23
R30
RT Signal Limiter
LPI ACG R28 Loudspeaker C25 C21
+ 2VBE + VO1 SAI Line - R1 Gnd
Line AGC
Anti- Howl
MOTOROLA ANALOG IC DEVICE DATA
13
MC34216A
The microphone threshold reduces the gain in the acoustic feedback loop by 7.0 dB. When there is no, or only a small microphone signal, the gain in the transmit path is reduced by 7.0 dB with respect to nominal. The loudspeaker gain is then at its nominal value. At a high microphone input current, the microphone gain is back to its nominal value and the loudspeaker gain reduced by 7.0 dB. The behavior of the microphone threshold feature is depicted in Figure 12. Figure 12. Behavior of the Microphone Threshold Feature
Gain
mode, the signal on this pin will be amplified to the loudspeaker output. In this way, the features and functionality of the MC34216A are optimally used, like its powerful supply, loudspeaker amplifier with anti-distortion circuitry and line current regulation. More details about this application can be found in the user manual. Ringing The MC34216A offers the possibility to generate a ringing melody via the loudspeaker, which avoids the use of a piezo buzzer. The power needed to supply the loudspeaker is transformed out of the ringer signal by a switched mode power supply TCA3385. The melody is generated by the MC34216A and programmed via the microcontroller. This concept is depicted in Figure 13. As can be seen in Figure 13, the high voltage ring signal is first transformed into a low voltage supply point with high current capability. This is needed because, compared to a piezo resonator, a loudspeaker is low ohmic. In the ringing mode, the voltage of the supply point is stabilized by the MC34216A to 5.5 V. The ringing melody can be programmed via the microcontroller and is generated internally. The output signal level is regulated via a gain control loop. The loop couples the value of VCC to the output current of the ringing melody generator. No ringing melody is made audible when VCC is below 3.8 V and the maximum volume is reached when VCC has reached 5.5 V. To ensure optimum output power under low line current conditions, the current consumption of the MC34216A in ringing mode is reduced down to 2.0 mA. The MC34216A offers the possibility to listen to the ringing melody while in the speech mode. Although the feeding conditions are not equal for ringing and speech mode, this offers the user the possibility to program his own melody and to adjust the volume.
Nominal
A TX
Reduced
A LSP Iu (Arms) 33 n 110 n
Handsfree A speakerphone application for handsfree conversation can easily be made with the MC34216A by adding one of the Motorola speakerphone cores to it. The TXI input can be used to amplify the transmit signal and the earphone output can be used to monitor the receive signal. The receive output of the speakerphone core can be connected to AHO1. When programming the MC34216A in speakerphone
Figure 13. Concept of Ringing Via Loudspeaker
Hookswitch LI R24 R4 Phone Line L1 Gnd VCC RDO Microcontroller R1 Bus IR LPI R30 C4 Off Hook Application CO DRV TCA3385 Rin T1 D10 C7 C8 VCC Gnd
Ringer Supply Regulator and Melody Generator
MC34216A LPO C24
SAI of MC34216A
14
MOTOROLA ANALOG IC DEVICE DATA
MC34216A
Programming Possibilities The MC34216A can be programmed by a microcontroller via a 2 wire bus. In this way, it is possible to program the dc mask, DTMF tones, listening-in mode, loudspeaker volume, etc. The bus interface of the microcontroller with the MC34216A consists of 2 wires: a data wire and a clock wire connected to Pins D/HS and CLK respectively. Also, the reset Pin RST of the MC34216A is connected to the microcontroller. The MC34216A itself has a local oscillator connected to Pin Osc. The local oscillator needs a 500 kHz parallel mode ceramic resonator, with approximately 75 pF capacitance, connected to ground (for instance, the TOKO FCRK500A-P35). The local oscillator is the reference for all the internal timings of the MC34216A. The 2 wire bus is based on the SCI standard. This standard includes things such as de-bouncing and bus monitoring in order to check that the data is sent over correctly. The full bus specification is depicted in Figure 14. The data is read in during the falling edge of the clock signal. The clock has to be active only during the transfer of the data. After the data is sent, the clock has to be kept low. The D/HS pin is not only the input for the data but also the output for the hookswitch information. When there is line current flowing, this pin will be high, provided that the clock line is low. The reset Pin RST of the MC34216A is high for supply voltages on VCC of 3.1 V and higher. It is the indication for the microcontroller that programming of the device is possible. When RST becomes high and D/HS is high as well, the microcontroller can start programming the registers for the speech mode. When information from the ringer indicates that there is a ring signal present on the line, the microcontroller can start programming the registers for ringing mode. The registers of the MC34216A are 8-bits wide. The register bits are shown in Figure 15. The 8-bits can be split up into 2 address bits and 6 data bits of the format A1A0D5D4D3D2D1D0. Data is sent over starting with the address bits (A1 and A0) and then the data bits, D5 through D0. During startup of the MC34216A, the registers are internally reset in order to have a defined state. The contents of the registers after the reset are also given in Figure 15. In summary, it starts up with LV mask and handset mode with the transducers muted.
Figure 14. Bus Specification
TI Tclk T(on)
Clk
D/HS TDS TDH
T1 Clk
D/HS
Symbol
Description
Min
Max
Unit
Tclk T(on) TDS TDH TD TI T1 Vihc Vilc Vihd Vild
Clock Period High Level Duration Data Setup Time Data Hold Time Debounce Time Data Reset Time to First Clock Rising Edge Interval Between 2 Successive 8-Bit Words High Input Level - Clock Low Input Level - Clock High Input Level - Data Low Input Level - Data
125 66 10 20 16 40 700 0.7 0.0 1.7 0.0
1000 - Ton 900 - - - 5.0 0.3 5.0 1.2
s s s s s s s Vdc Vdc Vdc Vdc 15
MOTOROLA ANALOG IC DEVICE DATA
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DCM1 MFC1 1 1 0 0 1 1 0 0 DCM0 MFC0 1 0 1 0 1 0 1 0 French Mask Low Voltage Mask U.K. Mask Startup Mask for France Select DTMF/Idle Tone Level (Level ILAI) Select Pilot/Idle/Ring Tone Frequency Select DTMF-Pair and Generate Switch DTMF Generation "Off" A1, A0 = 11 A1, A0 = 10 A1, A0 = 01 A1, A0 = 00 Address Function Function Data D5 D4 D3 D2 D1 D0 D5 D4 D3 D2 D1 D0 D5 D4 D3 D2 D1 D0 D5 D4 D3 D2 D1 D0
16 Figure 15. Register Description
Symbol DCM1 DCM0 MFC1 MFC0 MicM MicP MF3 MF2 MF1 MF0 HPI R/S Mth GR EM G2 G1 G0 EA RT PT LD Sp IT
MC34216A
Microphone Threshold
Anti-Howling
Line Length Regulation
Speakerphone Mode
DC Mask Control
DC Mask Control
Ring Tone
Loudspeaker Gain
Loudspeaker Gain
Loudspeaker Gain
Earphone Gain 6.0 dB
Ring/Speech Mode
Tone Select
Tone Select
Tone Select
Tone Select
Tone Control
Tone Control
Microphone Power
Idle Tone
Pilot Tone
Loop Disconnect
Earphone Mute
Microphone Mute
Function
G2
1
1
1
1
0
0
0
0
G1
1
1
0
0
1
1
0
0
MOTOROLA ANALOG IC DEVICE DATA
0 = "On" 0 = "On" 0 = "On" 0 = "Off" 1, See Tables Below 0, See Tables Below 0 = Tone "Off" 0, See Tables Below 0, See Tables Below 0, See Tables Below 0 = Nominal Gain 0 = Speech Mode 0, See Tables Below 0, See Tables Below 0, See Tables Below 0, See Tables Below 0, See Tables Below 0, See Tables Below 0 = Power "Off" 0 = Tone "Off" 0 = Tone "Off" 0 = Loop Closed 0 = Muted 0 = Muted G0 State at Reset 1 0 1 0 1 0 1 0 No Attenuation, Nominal Gain Gain Reduction 4.5 dB Gain Reduction 9.0 dB Function Gain Reduction 13.5 dB Gain Reduction 18.0 dB Gain Reduction 22.5 dB Gain Reduction 27.0 dB Loudspeaker Amplifier Muted
AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAA A A A A A A A AA AAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAA A A A A A A A AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA A A AAA A A A A AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA A AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA A AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A AAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAA A A A A A AAA AAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA A A AAA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA A A AAA AAAAAAAAAAAAAAAAAAAAAAA
MF3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 MF2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 MF1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0
The dc mask of the MC34216A can be programmed to fit the different country requirements. During startup, this will be the first register which has to be programmed in order to have a dc setting as soon as possible. The pulse-dialing is timed by the microcontroller (make/brake ratio, inter-digit pause) by making the LD bit high and low. Also, memory dialing or last number redial can be done. During LD = 1, the MC34216A makes its output LAO low for the line break and reduces its internal current consumption. The current through the microphone can be stopped also by making bit MicP low. The transmit path can be muted by making the MicM bit low. It effectively mutes both the signal from the handset microphone as well as the signal coming from a speakerphone circuit. During this microphone mute state, a
MOTOROLA ANALOG IC DEVICE DATA Figure 16. Register Description
MF0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
MC34216A
Low
MFC1 = 0, MFC0 = 1
697
697
697
697
770
770
770
770
852
852
852
852
941
941
941
941
DTMF-Pair (in Hz)
1209
1336
1477
1633
1209
1336
1477
1633
1209
1336
1477
1633
1209
1336
1477
1633
High
melody can be sent to the line (melody on hold). In order to enable the idle tone function, the IT bit has to be made high. The squelch function can be enabled by making the Mth bit low. The line AGC feature can be enabled by making the GR bit low. The receive path can be muted by making the EM bit low. It effectively mutes both the signal from the line to the handset earpiece as well as to the loudspeaker output. During this mute state, a pilot tone melody can be sent to the earpiece or loudspeaker. This is very useful during pulse-dialing, programming of telephone numbers in memories or during operation of an answering or fax machine. In order to enable the pilot tone function, the PT bit has to be made high. The gain of the earphone amplifier can be increased by 6.0 dB by making the EA bit high.
Key
C
D
A
B
1
2
3
4
5
6
7
8
9
0
#
*
MFC1 = 1, MFC0 = 0
Single Tone (in Hz)
2093
1760
1661
1319
1047
988
880
784
698
659
622
587
554
523
494
440
17
MC34216A
The MC34216A incorporates a DTMF generator with integrated filters. The DTMF pairs can be selected by the microcontroller via the MF bits. In this way, the whole DTMF range for a 4x4 keyboard is available which fulfills the CCITT requirements. The DTMF level on the line can be adjusted by external components and it can also be programmed via the MF bits. For listening-in operation, the loudspeaker has to be switched on and the anti-howling circuitry has to be activated. The loudspeaker is switched on by making the G2G1G0 bits high. They also set the volume. The anti-howling circuit is activated by making bit HPI low. By making bit Mth high, the microphone threshold feature is enabled which further reduces the effect of howling. By making the SP bit high, the speakerphone mode is programmed. This automatically disables the earpiece by muting the RXO2 output, and it enables the AHO1 input as a speakerphone signal input. By making the MicP bit low, the handset microphone is no longer powered and is thus muted. This ensures that only the signal from the base microphone is transmitted to the line. By making the R/S bit high, the ringing mode is programmed. The ringing melody is programmed via the microcontroller and generated by the MC34216A. The volume can be programmed via the 3 loudspeaker gain bits G2G1G0. The ring melody is enabled by making the ring tone switch RT high. The melody can be tested during normal speech mode by activating the ring tone switch RT while R/S is low. The answering machine mode is entered by making the R/S bit high. This enables the microphone, earphone and loudspeaker amplifiers while the set is on-hook. This makes it possible to record a message with the handset microphone and to playback messages via the earpiece or loudspeaker. Other blocks of the circuit are not activated. During off-hook operation, the incoming messages can be recorded and the outgoing message can be played in the normal way. More details about the answering machine application can be found in the user manual. Support Material Device Specification: Brief description of the MC34216A, block diagram, device data, bus specification, test diagram, typical application
User Manual MC34216A: Extended description of the circuit and its concept, description of the programmability, adjustment procedure, application hints and proposals Demonstration Board: Performance of the MC34216A is shown in an application with the TCA3385 switched mode power supply and a MC68HC705 microcontroller A QBASIC program which helps the customer to find the right component values for fulfilling the requirements Visualizes the register contents which are transmitted on the demonstration board by means of LEDs
Adjustment Software:
Register Display Board:
18
MOTOROLA ANALOG IC DEVICE DATA
Figure 17. Typical Application
Line + C11 R14 C14 To IMP R16 C17 R20 C16 10 C19 26 R6 27 25 RXI 20 15 R7 Value Value Component LV F Value U.K. Value Component LV Value Value F U.K. RXO2 AGnd Gnd Value Component LV, F, U.K. RXO1 MC34216A HYN CM NDC SAO LAI IMP 12 11 14 9 13 20 Iref VCC 21 C31 5 22 R5 + C7 C12 R12 To IMP C13 C32 T2 To SAI R21 R13 C10 R15 To HYN
MOTOROLA ANALOG IC DEVICE DATA
From VCC 6 TXI C34 7 Mic C35 LPO C24 C23 R30 23 24 LPI LAO 330 p 470 p 10 n 8 T3 560 k 0 750 k 150 k 7.5 k 20 k 330 k 620 k 620 k 120 k 13 k 15 k RS 19 R1 R5 R6 R7 R9 R12 R13 R14 R15 R16 R20 R21 R28 R29 R30 R31 AGC 28 C25 R28 C21 AHO1 1 C26 AHO2 2 C27 15 820 150 k 1.0 k 39 k 69.8 k 560 k 620 k 620 k 120 k 5.1 k 16.2 k 10 k 10 220 k 1.8 k C2 C3 C5 C6 C7 C10 C11 C12 C13 C14 C16 C17 C19 C20 C21 470 p 220 p 10 n 22 n 470 0 4.7 n 220 p 470 p 10 n 1.0 n 470 p 470 p 470 n 680 n 100 n 10 68 n Clk D/HS MTF 3 C28 MTC 4 C29 X1 C22 R29 To IMP C2 R1 SAI 15 Osc 16 18 17 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C34 C35 T2 T3 X1 100 n 330 p 47 220 n 220 n 220 n 15 n 100 n 10 100 n 1.0 n 4.7 n 2.2 MJE350 MPSA42 500 kHz LV = Low Voltage Mode F = France U.K. = United Kingdom
C20
Handset Earpiece
C3
+
MC34216A
C6
R31
C30
R9
C5
Handset Microphone
To Microcontroller
Speaker
Line -
19
MC34216A
OUTLINE DIMENSIONS
DW, DWF SUFFIX PLASTIC PACKAGE CASE 751F-04 ISSUE E
-A28 15 14X
-B1 14
P 0.010 (0.25)
M
B
M
28X D
0.010 (0.25)
M
TA
S
B
S
M R X 45
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A B C D F G J K M P R MILLIMETERS MIN MAX 17.80 18.05 7.40 7.60 2.35 2.65 0.35 0.49 0.41 0.90 1.27 BSC 0.23 0.32 0.13 0.29 0 8 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.701 0.711 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0 8 0.395 0.415 0.010 0.029
-T26X
C G K -TSEATING PLANE
F J
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JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, Toshikatsu Otsuki, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-3521-8315 HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298
20
*MC34216A/D*
MC34216A/D MOTOROLA ANALOG IC DEVICE DATA

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