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SM8224B
NIPPON PRECISION CIRCUITS INC.
Dual-Tone Receiver IC
OVERVIEW
The SM8224B is a receiver and decoder that supports the Bellcore TR-NWT-000030 and SR-TSV-002476 standards calling number identification (caller ID) and call waiting dual-tone signals. It has separate caller ID signal and call waiting signal inputs, which allows the gain for each input to be adjusted independently. It is fabricated in CMOS and features a power-down function, realizing low power dissipation operation.
FEATURES
s
PINOUT
(Top view)
s s s s
s s s s
TR-NWT-000030 and SR-TSV-002476 standards (Bellcore) Call waiting FSK decoder High input sensitivity Independent input gain adjustment for caller ID signal and call waiting signal inputs Power-down mode Crystal oscillator circuit built-in Single supply operation:4.5 to 5.5V Molybdenum-gate CMOS process
AGND TIP RING TRQ GND OSCIN OSCOUT MODE TEST DOUT
1
20
DT1 DT2 DTQ S0 S1 VDD CDET CR DTDET
SM8224B
APPLICATIONS
s
s
s s s
Telephones, fax machines and modems that support pre- and mid-conversation information services Adapters for pre- and mid-conversation information service functions Telephone answering machines Facsimile machines Computer peripheral equipment
10
11
STR
ORDERING INFORMATION
D e vice SM8224BM SM8224BS P ackag e 20-pin SSOP 20-pin SOP
NIPPON PRECISION CIRCUITS--1
SM8224B
PACKAGE DIMENSIONS
(Unit: mm)
20-pin SSOP
1.30 0.10
7.40 max 7.20 0.05
0.20 0.05
5.30 0.05
7.90 0.20
0.62 typ
1.80 0.10
2.10 max
0 to 8
0.10 0.10
0.68 0.12 0.10 0.30 0.10
0.65
0.13 M
20-pin SOP
12.75 0.10
0.275
10.31 0.20
7.50 0.10
0.51 0.2 45
0 to 8
0.41 0.05
0.20 0.10
1.27
2.34 0.10
NIPPON PRECISION CIRCUITS--2
0.76 0.25
0.6 0.15
0.045
SM8224B
BLOCK DIAGRAM
TIP Filter RING TRQ DT1 DT2 DTQ Filter (2130Hz)
FSK Demodulator
Output Circuit
DOUT
Carrier Detector
CDET
Detector Circuit (2130Hz)
Filter
Level Detector Time-constant Circuit
AGND Bias Circuit
Filter (2750Hz)
Detector Circuit (2750Hz)
STR CR DTDET
Level Detector Crystal Oscillator Circuit Power-down Circuit
OSCIN OSCOUT
MODE S1 S0
VDD GND
NIPPON PRECISION CIRCUITS--3
SM8224B
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name AG N D TIP RING TRQ GND OSCIN OSCOUT MODE TEST DOUT STR DTDET CR CDET VDD S1 S0 DTQ DT2 DT1 I/O O I I O - I O I - O O O I/O O - I I O I I Function Analog ground output. Internal reference voltage (V D D /2) output level Tip input. Connected to the telephone line through a protection circuit Ring input. Connected to the telephone line through a protection circuit Input-stage amplifier gain-select output. Used to adjust the gain of the input-stage amplifier. Ground. Connected to the system ground potential. Cr ystal oscillator input. The crystal oscillator element is connected between this pin and OSCOUT. Cr ystal oscillator output. The crystal oscillator element is connected between this pin and OSCIN. When MODE is HIGH, and S1 and S0 are both LOW , the device is in pow er-down state. See table 2. TEST pin. Set OPEN when nor mal using. Data output. Demodulated FSK signal output. HIGH level output when C D E T goes HIGH. Dual-tone confirmation output. Function is selected by S0 and S1. See table 2. Dual-tone confirmation: Active-LOW output when dual tone detection signal passes through RC time constant delay circuit. Dual-tone detector output. HIGH-level output when dual tone is detected. Dual tone RC time constant circuit connection. The dual tone detection signal passes through the RC network to generate the S T R signal. FSK signal carrier detector output. LOW -level when active carrier is detected. Supply Function select bit 1. Selects the device mode in combination with S0 and MODE. See table 2. Function select bit 1. Selects the device mode in combination with S1 and MODE. See table 2. Dual-tone signal input-stage amplifier output. Used to adjust the gain of the input-stage amplifier. Dual-tone signal input-stage operational amplifier inverting input Dual-tone signal input-stage operational amplifier non-inverting input
NIPPON PRECISION CIRCUITS--4
SM8224B
SPECIFICATIONS
Absolute Maximum Ratings
GND = 0V
P arameter Supply voltage range Input voltage range Pow er dissipation Storage temperature range Symbol VDD V IN PD T stg Condition Rating - 0.5 to 7.0 - 0.3 to V D D + 0.3 44 -40 to 125 Unit V V mW C
Recommended Operating Conditions
GND = 0V
Rating P arameter Supply voltage Clock frequency Clock frequency accuracy Operating temperature Symbol VDD fC L K f C T opr Condition min 4.5 - -0.1 -20 typ - 3.579545 - - max 5.5 - +0.1 85 V MHz % C Unit
Electrical Characteristics
VDD = 5.0V 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating P arameter Symbol Condition min Supply current consumption ID D No analog signal input, no output load, S1 = 0V, S0 = V D D , MODE = 0V No analog signal input, other inputs = V D D or 0V, no output load, S1 = 0V, S0 = 0V, MODE = V D D - typ - max 8.0 mA Unit
Pow er-down current MODE, S0, S1 LOW -level input voltage MODE, S0, S1 HIGH-level input voltage O S C I N L OW -level input voltage OSCIN HIGH-level input voltage D O U T, S T R , DTDET, CR, C D E T L O W -level output current D O U T, S T R , DTDET, CR, C D E T HIGH-level output current TIP, RING, DT1, DT2, MODE, S1, S0 input leakage current
ID P D
-
-
15
A
V IL1 V IH1 V IL2 V IH2 IO L IO H IIN
- 0.7V D D - 0.7V D D 2 - -1
- - - - - - -
0.3V D D - 0.3V D D - - -0.8 1
V V V V mA mA A
NIPPON PRECISION CIRCUITS--5
SM8224B
AC Electrical Characteristics
Measurement conditions: R1 = 430k, R2 = 34k, R3 = 390k, C1= 0.22F FSK decoder VDD = 5.0V 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating P arameter Input sensitivity S/N ratio 1 FSKSNR CDON C DOFF fC L K Symbol Condition min - 20 - -50 typ - 0.1% typ -43 - -43 -46 3.579545 max CDON - -37.78 - typ + 0.1% dBm dB dBm dBm MHz Unit
Carrier detection sensitivity Carrier non-detection sensitivity Oscillator frequency
1. M a r k signal and SPA CE signal are same level. Noise: Random noise from 200Hz to 3400Hz.
Dual tone detector VDD = 5.0V 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating P arameter Frequency (low frequency) Frequency (high frequency) Detection frequency deviation Non-detection frequency deviation Detection sensitivity Non-detection sensitivity Signal level deviation Note: (S0, S1, MODE) = (V D D , 0V, 0V) Symbol fL fH Condition min - - 1.1 3.5 -37.78 - - typ 2130 2750 - - - - - max - - - - - -43.78 6 Hz Hz % % dBm dBm dB Unit
Input-stage amplifier Characteristics
VDD = 5.0V 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating P arameter Input leakage current DC open-loop voltage gain Unity gain frequency Load capacitance Load resistance Symbol IIN G OL fC CL RL Condition min - 30 80 - 50 typ - - - - - max 1 - - 100 - A dB kHz pF k Unit
NIPPON PRECISION CIRCUITS--6
SM8224B
Timing Characteristics
FSK decoder VDD = 5.0V 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating P arameter Pow er-down release to start-up time Carrier detection ON time Final data to carrier detection OFF time Symbol tD O S C tD A Q tD C H Condition min - 2.5 3 typ 5 - - max - 10 15 ms ms ms Unit
Output timing) VDD = 5.0V 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C, FSK input data = 1200 12 baud unless otherwise noted.
Rating P arameter S T R , DOUT rise time S T R , DOUT fall time Input/output delay DOUT data rate Symbol tr0 tf0 tI D D Input to DOUT Condition min - - - 1188 typ - - - 1200 max 200 200 5 1212 ns ns ms baud Unit
NIPPON PRECISION CIRCUITS--7
SM8224B
TIMING DIAGRAMS
FSK demodulator timing
1st Ring L1/L2 101010... 1 Data 2nd Ring
PDWN
CDET
tDAQ
DOUT 101010...1 Data
tDCH
OSCOUT
tDOSC
P D WN is an internal signal (set by S0, S1, MODE)
Output timing
DOUT
DOUT
90% 10%
tr0
tf0
STR
STR
90% 10%
tf0
tr0
Data timing
STOP START STOP START
TIP/RING
b6 b7 1
0 b0 b1 b2 b3 b4 b5 b6 b7 1
0 b0 b1 b2 b3 b4 b5 b6
tIDD
START
DOUT
b4 b5 b6 b7
b0 b1 b2 b3 b4 b5 b6 b7
STOP
b0 b1 b2 b3 b4
NIPPON PRECISION CIRCUITS--8
SM8224B
FUNCTIONAL DESCRIPTION
The SM8224B receiver with caller ID service conforms to the Bellcore standards. It incorporates FSK demodulator and dual-tone detection functions in a single chip. It has a dedicated dual-tone signal input so that the FSK signal input amplification and dualtone signal input amplification can be set independently. This allows systems can be easily constructed that provide pre- and mid-conversation information services.
FSK Demodulator
Calling number identification service is sent as an FSK signal, and the SM8224B FSK demodulator processes this signal. The FSK signal conforms to the following Bellcore standard.
Table 1. FSK signal
P arameter Modulation type Logic "1" data (mark) Logic "0" data (space) Signal level (mark) Signal level (space) Data transfer rate Description Continuous-phase binar y frequency-shiftkeying 1200 12 Hz 2200 22 Hz -32 to -1 2 d B m -36 to -1 2 d B m 1200 12 baud
Table 2. Function select
S1 LOW HIGH LOW HIGH LOW S0 LOW LOW HIGH HIGH LOW MODE HIGH LOW LOW LOW LOW Pow er-dow n Dual-tone detection from DT1/DT2 1 FSK and dual-tone detection from TIP/RING FSK detection from TIP/RING Test mode 2 Function STR HIGH L O W (dual tone confirmation) L O W (dual tone confirmation) HIGH
1. DT1, DT2, DTQ are active in this mode only. 2. Test mode should not be used. Note: S1, S0, MODE setting should be used from above combination except Test mode.
Dual Tone Detector
When using mid-conversation information services, 2 mixed signals of 2130Hz and 2750Hz are sent on lines L1 and L2. The SM8224B detects the 2 signals from the background noise. It uses 2 separate highorder filters with center frequencies of 2130Hz and 2750Hz to detect the presence of the signal frequencies. In series with the filters are level detectors. When the input level exceeds the preset rating, the signal is detected. When the input level is below the rating, the signal is not detected. If both the 2130Hz and 2750Hz signals are simultaneously detected, DTDET goes HIGH and starts charging the time constant circuit comprised by an external capacitor and external resistor. When the time constant circuit voltage rises above a fixed voltage level, STR signal goes LOW to indicate dual tone detection.
NIPPON PRECISION CIRCUITS--9
SM8224B
TYPICAL APPLICATION CIRCUIT
Speech Network Circuit
R6 1% C2 5% C2 5%
R6 1%
R9 1% R4 1% R5 1% R2 1% 0.1F 20%
R8 1%
Protection Circuit L1 C1 5% L2 C1 5%
VDD R1 1% R2 1% VDD
AGND TIP RING TRQ GND OSCIN
DT1 DT2 DTQ S0 S1 VDD VDD R7 1%
R3 1%
R1 1%
OSCOUT CDET MODE TEST DOUT CR DTDET STR 0.1F 20%
Note : Please set this capacitor nearby IC pin.
Symbol R1 R2 R3 C1 R4 R5 R6 R7 C2 R8 R9 1. Circuit values are preliminary.
Rating 1 330 27 220 0.001 47.5 60.4 430 + 34 390 0.22 52.3 60.4
Unit k k k F k k k k F k k
NIPPON PRECISION CIRCUITS--10
SM8224B
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698
NC9910AE 2000.02
NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS--11

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