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KA8601C
INTRODUCTION
SPEAKER PHONE WITH SPEECH NETWORK
The KA8601C is a monolithic integrated circuit for use in high performance speaker phone system. The KA860lC consists of speaker phone and speech network. Speaker phone includes attenuators, amplifiers, level detectors, attenuator control, hybrid amplifiers, regulator and AGC circuit. Speech network includes transmit amp, receive amp, voltage regulator for dialer, side tone control, and line equalizer.
48-SDIP-600
FEATURES
* Speaker Phone - Low Operating Voltage (3.0 ~ 6.5V) - High Attenuator Gain Range (52dB) - Improved Sensitivity (Four-point Signal Sensing) - Chip Disable for Active or Standby Operation - Microphone Amp Gain set by External Components * Speech Network - Low Operating Voltage (1.5V : speech) - Regulated Voltage for Dialer (Typically 3.3V) - Transmit, Receive, Side Tone Gains set by External Components - Mute Input for DTMF Dialing
ORDERING INFORMATION
Device KA8601C Package 48-SDIP-600 Operating Temperature - 25C ~ + 75C
BLOCK DIAGRAM
DETO RX1
DETO RX2
DETO TX1
DETO TX2
DETI RX1
DETI RX2
DETI TX1
DETI TX2
RXO ATT
DTO-
TXO ATT 26
RXI ATT
TXI ATT
PD RX
PD TX
MICO
GND
MICI
47 DTI
36
46
45
44
43
42
41
40
39
38
37
35
34
33
32
31
30
29
28
27
48
25 VCC 24 POWER BNM : Back Noise Monitor 3.3Vreg
level detector
mic amp
level detector
RX Attenuator
SPEAKER PHONE PART
hybrid amp 1
ATTENUATOR CONTROLLER
hybrid amp 2
sidetone amp
TX amp2
BNM
FILTER
SPEECH NET8 WORK PART
DC level shift
1.7Vreg
AGC
mic amp
15 TX amp1
REC amp
RXOSUM 21
10
11
14
16
17
18
19
20
22
RX amp
TX Attenuator
BNM
AGC
12
13
RXO+
DTO+
MICI+
MICO
RXO-
MICI-
GND
AGC
TXI
RXI
MS
CD
MT
NC
NC
FO
VR
LC
VI
FI
ZB
VL
23
1
2
3
4
5
6
7
9
VDD
MT
VC
VB
CT
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
PIN CONFIGURATION
DTO+ CD FI FO R4 VI VL LC VR MICIMICI+ GND MICO TXI AGC RXO+ NC NC RXORXI RXOSUM ZB MS VCC
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39
DTODTI RXOATT RXIATT GND PDRX DETIRX1 DETORX1 DETOTX1 DETITX1 MICO MICI MT VC CT DETIRX2 DETORX2 DETOTX2 DETITX2 PDTX VB TXIATT TXOATT VDD
KA8601C
38 37 36 35 34 33 32 31 30 29 28 27 26 25
Fig. 2
PIN DESCRIPTION
Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Symbol DTO+ CD FI FO MT VI VL LC VR MICIMICI+ GND MICO TXI AGC Description Output of the second hybrid amplifier. Chip Disable. A logic low (<0.8V) sets normal operation. Filter input. Filter output. Mute input. A logic "1" sets normal speech mode. A resistor connected from this pin to VSS sets the AC terminating impedance. Power supply for the speech network. Supply voltage is derived from loop current. T X amp output operates on this pin. Resistor at this pin set the DC characteristics of the circuit. A 1.7 volt regulated output which can be used to bias the mic. Inverting differential input to the mic amp. Non-inverting differential input to the mic amp. Ground pin for the speech network. Mic amp output. Input to the TX amp from the Mic amp. Loop current sensing input.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
PIN DESCRIPTION (continued)
Pin No 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Symbol RXO+ NC NC RXORXI RXO SUM ZB MS VCC VDD TXOATT TXIATT VB PD TX DETITX2 DETOTX2 DETORX2 DETIRX2 CT VC MT MICI MICO DETTX1 DETOTX1 DETORX1 DETIRX1 PD RX GND RXI ATT RXO ATT DTI DTO Description RX amp non-inverting differential output. No connection. No connection. RX amp inverting differential output. Input to the RX amp. Summed output of the RX current amp. Input to the RX current amp. Mode select input. A logic "1" pulse dialing, A logic "0" tone (DTMF) dialing. A supply voltage pin for the speaker phone part. A regulated 3.3 volt output for an external dialer. Output of the TX attenuator. Input to the TX attenuator. This voltage is a system AC ground, and biases the volume control. A filter cap is required. An RC at this pin sets the time constant for the TX background monitor. Input to the TX level detector on the mike/speaker side. Output of the TX level detector on the mike/speaker side. Output of the RX level detector on the mike/speaker side. Input to the RX level detector on the mike/speaker side. This pin sets the response time for the circuit to switch modes. Volumn control input. Mute input. A logic low (<0.8V) sets normal operation. A logic high (>2.0V) mutes the mic amp. Input and summing node of the mic amp. Output of the mic amp is set by external resistors. Input to the TX level detector on the line side. Output of the TX level detector on the line side. Output of the RX level detector on the line side. Input to the RX level detector on the line side. A RC at this pin sets the time constant for the RX background monitor. Ground pin for the speaker phone part. Input to the RX attenuator and dial tone detector. Output of the RX attenuator. Input and summing node of the mic amp. Output of the first hybrid amplifier.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
ABSOLUTE MAXIMUM RATINGS
Characteristic Supply Voltage Speaker Phone Voltage at VC Voltage at CD,MT Voltage at TXI, RXI, HFI Supply Voltage Speech Network Supply Voltage for dialer Voltage at MTS, MS Current Through VL, LC Current into ZB Operating Temperature Storage Temperature Symbol VCC VI (VC) VI (CM) VI (TRH) VCC VDD VI (MS) II (VL, LC) II (ZB) T OPR T STG (Ta = 25C) Test Conditions Min Typ Max Unit Value - 1.0 ~ + 7.0 - 1.0 ~ VCC + 0.5 -1.0 ~ VCC + 1.0 - 0.5 ~ VCC + 0.5 - 1.0 ~ + 12 - 1.0 ~ + 6.0 - 1.0 ~ VDD + 0.5 130 3 - 25 ~ + 75 - 65 ~ + 150 Unit V V V V V V V mA mA C C
ELECTRICAL CHARACTERISTICS
Characteristic Symbol
SPEECH NETWORK (Ta = 25C, unless otherwise noted) Speech Mode Line Voltage VL Pulse Mode Tone Mode VR Voltage MF Operating Voltage VR VDD (MF) IL = 30mA VL = 4.5V Tone Mode IL = 30mA IL = 120mA IL = 30mA Speech Mode Tone Mode IDD = 1.6mA Speech Mode MF Operating Current (Max) IDD MF (MAX) IL = 30mA Pulse Mode Tone Mode MICO Bias Voltage TXI Bias Voltage MIC Amp Gain MIC Common Mode Rejection Ratio MIC Gain Reduction T X Gain T X Distortion RX Gain RX Distortion Side Tone Gain VBIAS (MPO) VBIAS (TxTs) GV (MIC) CMRR(MIC) GV (MIC) GV (TX) THD TX GV (RX) THD RX GV (ST) MT = 0V Speech Mode IL = 30mA Speech Mode IL = 30mA IL = 30mA IL = 30mA IL = 80mA Speech Mode IL = 30mA IL = 80mA Speech Mode Speech Mode IL = 30mA IL = 30mA IL = 30mA Speech Mode Speech Mode Speech Mode 3.0 8 4.4 1.55 3.0 3.0 0.5 2 2 0.8 0.04 27 30 -10 30 28 -15 -17 3.9 9.8 5.1 1.7 3.3 3.3 1.1 2.8 2.8 1.08 0.086 30 64 -60 34.8 31 -10.5 -14 10 4.7 11.5 6.5 1.85 3.8 V 3.8 2.0 4 4 1.4 0.2 33 60 34 2 -2 dB -10 2 15 % dB dB % V V dB dB dB mA V V
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
ELECTRICAL CHARACTERISTICS
Characteristic Side Tone Rejection MUTE Input Impedance MUTE Input Low Voltage MUTE Input High Voltage MS Input Low Voltage MS Input High Voltage
(Continued) Test Condition Min 20 VDD -0.3 2.0 Speech Mode 2.1 2.1 3.4 2.9 2.9 4.3 Typ 25 60 Max 1.0 V 0.8 3.5 3.5 5.2 V Unit dB K
Symbol RST ZI (MUTE) VIL (MUTE) VIH (MUTE) VIL (MS) VIH (MS) VLC
LC Level Shift
IL = 30mA
Pulse Mode Tone Mode
SPEAKER PHONE (Ta = 25C, VCC = 5.0V, unless otherwise noted) Operating Current ICC VCC = 6.5V CD = 0.8V CD = 2V 1.8 Reference Voltage VREF VCC = 3.5V VC = VB RX Attenuator Gain RX Attenuator Gain Change RX Attenuator AGC Gain Change RX Attenuator Gain (Idle Mode) RX Attenuator Gain Range RX Volume Control Range RX DC Output Voltage RX DC Output Voltage Change RX DC Output High Voltage RX DC Output Low Voltage (with respect to VB) RX Mode Distortion CT Voltage (with respect to VB) Dial Tone Detector Threshold T X Attenuator Gain T X Attenuator Gain Range T X Output DC Voltage T X Output DC Voltage Change GATT (RX) GATT (RX) GATT AGC (RX) GATT RX (IM) GATT (RX) GV CTL (RX) VO (RX) VO (RX) VOH (RX) VOL (RX) THD RX RX Mode VCT VTH (DET) GATT (TX) GATT (TX) VO (TX) VO (TX) Idle Mode T X Mode VC = VB, VRXI = 3.0V RX to TX Mode VRXI = 3.5V VRXI = 1V VCC = 3.5V, VC = VB VCC = 2.8V, VC = VB VCC = 3.5V, to 5.0V VCC = 2.8V, to 5.0V VC = VB VC = VB (RX to TX Mode) VC = 0.1VB IL = 1.0mA 1.5 4.0 4.0 -0.5 -22 49 27 3.7 10 4.0 49 5.5 0.6 2.1 1.7 1.3 6.0 6.0 -19 0 -25 -20 52 35 VB 10 -1.5 0.5 +240 0 -240 15 6.0 52 VB 30 8.0 mA 0.8 2.4 1.9 8.0 8.0 -11 +0.5 -15 -17 54 150 -1.0 3 20 8.0 54 150 mV dB dB V mV mV dB dB dB dB dB V mV V V % dB V
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
ELECTRICAL CHARACTERISTICS
Characteristic T X Output High Voltage T X Output Low Voltage T X Mode Distortion MIC Voltage Gain MIC Output Offset Voltage MIC Output High Voltage MIC Output Low Voltage MIC Input Bias Current Muting (Gain) MIC Amp Distortion MUTE Input High Voltage MUTE Input Low Voltage Open Loop Gain (Hybrid Amp) DTO-Output High Voltage DTO-Output Low Voltage DTO+Output High Voltage DTO+Output Low Voltage DTO Distortion Filter Offset Voltage Filter Input Bias Current
(Continued) Test Conditions VTXI = 3.5V VTXI = 1.0V Min 3.7 70 -50 VMIC = 1.0V VMIC = 3.0V 3.7 VMT = 2V, f = 1KHz -55 0.3KHz f 10KHz 2.0 0 60 3.7 IO = -5mA IO = 5mA IO = -5mA IO = 5mA 3.7 -22 0 Typ 0.5 0.8 80 0 -40 0.15 80 0.3 -90 -50 Max 1 3 +50 200 VCC 0.8 250 250 0 Unit V V % dB mV V mV nA dB % V V dB V mV V mV % mV mA
Symbol VOH (TX) VOL (TX) THDTX GV (MIC) VOO (MIC) VOH (MIC) VOL (MIC) IBIAS (MIC) GV (MUTE) THD MIC VIH (MUTE) VIL (MUTE) GV (HA) VOH (DTO -) VOL (DTO -) VOH (DTO +) VOL (DTO +) THD DTO VIO (F) VBIAS (F)
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
APPLICATION INFORMATION FUNCTION DESCRIPTION
SPEECH NETWORK 1. MICROPHONE AMPLIFIER This microphone amplifier is equipped with a fixed gain (30dB). Its basic configuration is shown in figure 3.
MICI+ MIC20K 20K
+ 30dB MT MICO
Fig .3
This amplifier has a mute function. If a mute signal from the dialer is inputted when the speech network is in the mute mode, the microphone amplifier will be muted. 2. VOLTAGE REGULATOR (DIALER INTERFERENCE) This voltage regulator has a minimum output voltage of 3.1 volts. When the dialer is not in motion, its minimum current is 1.0mA, where as when the dialer is moving the minimum current is 2.2mA. 3. VOLTAGE REFERENCE Generally when in the voltage reference mode, the microphone's bias voltage is used, but when in the TXlATT mode, DC bias voltage is used. The output voltage of the voltage reference is a minimum of 1.6 volts. SPEAKER PHONE 1. MICROPHONE AMPLIFIER This device amplifies outside microphone signals, which are inputted while in the inverting mode. As it alters elements, the microphone amplifier allows for them to be modulated. Its open loop gain is 80dB, while the band width is typically 1.0KHz. It has a mute function, and when operating in the mute mode at least 2.0V, the microphone amplifier gain is reduced to around 40dB. If the mute mode is not used, it must connected with the ground.
Rf MIC Ri + MT Bias Voltage MICO
Fig. 4
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
2.
VOLUME CONTROL The volume control can only be applied in the receive mode. If the voltage of the VC mode is the same as the VB, the receive attenuator gain is maximized and the transmit gain is minimized. At the same time, if the VC mode voltage is less than the VB, the receive attenuator gain is reduced.
VB KA8601C VC VOLUME
Fig. 5
3.
VOICE DETECTION FUNCTION The voice detection function compares the microphone amplifier output level with the outside audio amplifier level and the transmit attenuator output level with the receive attenuator input level, after which they are inputted into the control box. The block diagram of the voice detection function is as follows:
DETO RX 1
PDRX Background Noise Monitor
PDTX
DETO TX 1
DETIRX 1
A1
Log Amp Comparator
A3
Log Amp Comparator
DETI TX
1
C1
C2
CO1 Log Amp DETITX 1
CO2
CO3
CO4
Log Amp
A2
Attenuator Control Box
A4
DETI RX 1
DETO TX 1
DETO TX 1
Fig. 6
It is useful to use a background noise monitor when high background noise occurs. When the input signals to the background noise monitor are increased, voltage for the PDRX (PDTX) mode is stably increased. The increase time is determined by 100K and 47F. 4. ATTENUATOR CONTROL BOX In figure 6, each signal coming into the log amplifier is amplified and then inputted into the comparator (C1, C2). The comparator compares the amplified signal levels, after which they are inputted into the attenuator control box. The attenuator control box processes these signals (CO1, CO2, CO3, CO4) as logic signals, and which are put into one of the following modes:
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
1. Receive Mode 2. Transmit Mode 3. Slow Idle Mode 4. Fast Idle Mode Which of the above modes is to be determined depending on the following conditions: 1) Receive Mode DETOTX1 < DETORX1, DETOTX2 < DETORX2, PDTX, X, PDRX : 1 2) Transmit Mode DETOTX1 > DETORX1, DETOTX2 > DETORX2, PDTX : 1, PDRX : X 3) Slow Idle Mode DETOTX1 > DETORX1, DETOTX2 > DETORX2, PDTX : 0, PDRX : X DETOTX1 < DETORX1, DETOTX2 < DETORX2, PDTX : 0, PDRX : X DETOTX1 < DETORX1, DETOTX2 > DETORX2, PDTX : 0, PDRX : X DETOTX1 > DETORX1, DETOTX2 < DETORX2, PDTX : 0, PDRX : X 4) Fast Idle Mode DETOTX1 > DETORX1, DETOTX2 < DETORX2, PDTX : 0, PDRX : 0 DETOTX1 < DETORX1, DETOTX2 > DETORX2, PDTX : Y, PDRX : Y * "<" and ">" refer to voltage level : "X" refers to "It doesn't matter : "Y" is not zero 5. SWITCHING TIME The switching time of the speaker phone is determined by the CT and RT of the outside elements. 1. Idle Mode RX or TX Mode ST = 4,000 X CT 2. TX or RX Mode Fast Idle Mode ST = 2,000 X CT 3. TX or RX Mode Slow Idle Mode ST = RT X CT * CT, RT refer to the capacitor and resistor between Pin 34 and VCC.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
APPLICATION CIRCUIT

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