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SM8224C Dual-Tone Receiver IC
OVERVIEW
The SM8224C 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
I
PINOUT
(Top view)
I I I I
I I I I I
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: 2.7 to 5.5V Molybdenum-gate CMOS process Package: 20-pin SSOP, Chip form
AGND TIP RING TRQ GND OSCIN OSCOUT MODE TEST DOUT
1
20
DT1 DT2 DTQ S0 S1 VDD CDET CR DTDET
APPLICATIONS
I
I
I I I
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
PACKAGE DIMENSIONS
(Unit: mm)
ORDERING INFORMATION
Device SM8224CM CF8224C Package
1.30 0.10
7.40 max 7.20 0.05
20-pin SSOP Chip form
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
SEIKO NPC CORPORATION --1
0.6 0.15
SM8224C
PAD LAYOUT
(Unit: m)
TIP AGND
2 1
DT1 DT2
20 19 18
(2320,2730)
RING
3
NPC HB8224C
DTQ
TRQ GND
4
17
S0 S1
5
16
OSCIN
6
15
VDD CDET CR
OSCOUT
7
14
MODE
8 9
10 11 12
13
(0,0)
TEST DOUT
STR DTDET
Chip size: 2.32 x 2.73mm Chip thickness: 300 30m PAD size: 80m x 80m Chip base: VDD level
PAD NAME and DIMENSIONS
Pad dimensions [m] Pad number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pad name X AGND TIP RING TRQ GND OSCIN OSCOUT MODE TEST DOUT STR DTDET CR CDET VDD S1 S0 DTQ DT2 DT1 731 448 205 205 205 205 205 205 451 734 1585 1817 2114 2114 2114 2114 2114 2114 1896 1613 Y 2574 2574 2330 1947 1643 1235 789 398 155 155 155 155 451 684 990 1644 1947 2330 2574 2574
SEIKO NPC CORPORATION --2
SM8224C
BLOCK DIAGRAM
TIP Filter RING TRQ DT1 DT2 DTQ Filter (2130Hz) Detector Circuit (2130Hz) Carrier Detector CDET FSK Demodulator Output Circuit DOUT
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
SEIKO NPC CORPORATION --3
SM8224C
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name AGND 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 Reference voltage output. Internal reference voltage (VDD/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. Crystal oscillator input. The crystal oscillator element is connected between this pin and OSCOUT. Crystal 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 power-down state. See table 2. TEST pin. Set OPEN when normal using. Data output. Demodulated FSK signal output. HIGH level output when CDET 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 STR 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
SEIKO NPC CORPORATION --4
SM8224C
SPECIFICATIONS
Absolute Maximum Ratings
GND = 0V
Parameter Supply voltage range Input voltage range Power dissipation Storage temperature range Symbol VDD VIN PD Tstg Condition Rating -0.5 to 7.0 -0.3 to VDD + 0.3 100 -55 to 155 Unit V V mW C
Recommended Operating Conditions
GND = 0V
Rating Parameter Supply voltage Clock frequency Clock frequency accuracy Operating temperature Symbol VDD fCLK fC Topr Condition min 2.7 - -0.1 -20 typ - 3.579545 - - max 5.5 - +0.1 85 V MHz % C Unit
Electrical Characteristics
VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating Parameter Symbol Condition min Supply current consumption IDD No analog signal input, no output load, S1 = 0V, S0 = VDD, MODE = 0V No analog signal input, other inputs = VDD or 0V, no output load, S1 = 0V, S0 = 0V, MODE = VDD - typ - max 8.0 mA Unit
Power-down current MODE, S0, S1 LOW-level input voltage MODE, S0, S1 HIGH-level input voltage OSCIN LOW-level input voltage OSCIN HIGH-level input voltage DOUT, STR, DTDET, CR, CDET LOW-level output current DOUT, STR, DTDET, CR, CDET HIGH-level output current TIP, RING, DT1, DT2, MODE, S1, S0 input leakage current
IDPD
-
-
15
A
VIL1 VIH1 VIL2 VIH2 IOL IOH IIN
- 0.7VDD - 0.7VDD 2 - -1
- - - - - - -
0.3VDD - 0.3VDD - - -0.8 1
V V V V mA mA A
SEIKO NPC CORPORATION --5
SM8224C
AC Electrical Characteristics
Measurement conditions: R1 = 430k, R2 = 34k, R3 = 390k, C1= 0.22F FSK decoder VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating Parameter Input sensitivity S/N ratio1 Carrier detection sensitivity Carrier non-detection sensitivity Oscillator frequency FSKSNR CDON CDOFF fCLK 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
1. Mark signal and SPACE signal are same level. Noise: Random noise from 200Hz to 3400Hz.
Dual tone detector VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating Parameter 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) = (VDD, 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 = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating Parameter Input leakage current DC open-loop voltage gain Unity gain frequency Load capacitance Load resistance Symbol IIN GOL fC CL RL Condition min - 30 80 - 50 typ - - - - - max 1 - - 100 - A dB kHz pF k Unit
SEIKO NPC CORPORATION --6
SM8224C
Timing Characteristics
FSK decoder VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C unless otherwise noted.
Rating Parameter Power-down release to start-up time Carrier detection ON time Final data to carrier detection OFF time Symbol tDOSC tDAQ tDCH Condition min - 2.5 3 typ 5 - - max - 10 15 ms ms ms Unit
Output timing VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = -20 to 85C, FSK input data = 1200 12 baud unless otherwise noted.
Rating Parameter STR, DOUT rise time STR, DOUT fall time Input/output delay DOUT data rate Symbol tr0 tf0 tIDD Input to DOUT Condition min - - - 1188 typ - - - 1200 max 200 200 5 1212 ns ns ms baud Unit
SEIKO NPC CORPORATION --7
SM8224C
TIMING DIAGRAMS
FSK demodulator timing
1st Ring
L1/L2
2nd Ring 101010... 1 Data
PDWN
CDET
tDAQ
DOUT
tDCH
Data
101010...1
OSCOUT
tDOSC
PDWN 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
SEIKO NPC CORPORATION --8
SM8224C
FUNCTIONAL DESCRIPTION
The SM8224C 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 dual-tone 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 SM8224C FSK demodulator processes this signal. The FSK signal conforms to the following Bellcore standard.
Table 1. FSK signal
Parameter Modulation type Logic "1" data (mark) Logic "0" data (space) Signal level (mark) Signal level (space) Data transfer rate Description Continuous-phase binary frequency-shift-keying 1200 12 Hz 2200 22 Hz -32 to -12 dBm -36 to -12 dBm 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 Power-down Dual-tone detection from DT1/DT21 FSK and dual-tone detection from TIP/RING FSK detection from TIP/RING Test mode2 Function HIGH LOW (dual tone confirmation) LOW (dual tone confirmation) HIGH STR
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 SM8224C detects the 2 signals from the background noise. It uses 2 separate high-order 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.
SEIKO NPC CORPORATION --9
SM8224C
TYPICAL APPLICATION CIRCUIT
Speech Network Circuit
R6 1% C2 5%
C2 5% Protection Circuit L1 C1 5% L2 C1 5% R1 1% VDD VDD R1 1%
R6 1%
R9 1% R4 1% R5 1% R2 1% 0.1F 20%
R8 1%
R2 1%
AGND TIP R3 1% RING TRQ GND OSCIN
DT1 DT2 DTQ S0 S1 VDD VDD R7 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
Rating1 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
1. Circuit values are preliminary.
SEIKO NPC CORPORATION --10
SM8224C
Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter "Products") are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORATION (hereinafter "NPC"). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies.
SEIKO NPC CORPORATION
15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: sales@npc.co.jp
NC0021CE 2006.04
SEIKO NPC CORPORATION --11

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