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 ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ PINOUT 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 (Top view) AGND 1 20 TIP DT2 RING DTQ TRQ S0 GND S1 VDD OSCIN CDET OSCOUT APPLICATIONS ■ ■ ■ ■ ■ 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 DT1 CR MODE TEST DOUT DTDET 11 10 STR PACKAGE DIMENSIONS (Unit: mm) ORDERING INFORMATION 0.6 ± 0.15 1.30 ± 0.10 0.62 typ Chip form 0.20 ± 0.05 7.90 ± 0.20 CF8224C 7.40 max 7.20 ± 0.05 5.30 ± 0.05 20-pin SSOP 2.10 max SM8224CM 1.80 ± 0.10 Package 0.10 ± 0.10 Device 0 to 8 0.65 0.68 ± 0.12 0.10 0.30 ± 0.10 0.13 M SEIKO NPC CORPORATION —1 SM8224C PAD LAYOUT (Unit: µm) TIP AGND 2 RING 3 TRQ 1 DT1 DT2 20 (2320,2730) 19 NPC HB8224C 18 DTQ 4 17 S0 GND 5 16 S1 OSCIN 6 15 VDD OSCOUT 7 14 CDET 13 CR MODE 8 9 (0,0) 10 TEST DOUT 11 12 STR DTDET Chip size: 2.32 × 2.73mm Chip thickness: 300 ± 30µm PAD size: 80µm × 80µm Chip base: VDD level PAD NAME and DIMENSIONS Pad dimensions [µm] Pad number Pad name X Y 1 AGND 731 2574 2 TIP 448 2574 3 RING 205 2330 4 TRQ 205 1947 5 GND 205 1643 6 OSCIN 205 1235 7 OSCOUT 205 789 8 MODE 205 398 9 TEST 451 155 10 DOUT 734 155 11 STR 1585 155 12 DTDET 1817 155 13 CR 2114 451 14 CDET 2114 684 15 VDD 2114 990 16 S1 2114 1644 17 S0 2114 1947 18 DTQ 2114 2330 19 DT2 1896 2574 20 DT1 1613 2574 SEIKO NPC CORPORATION —2 SM8224C BLOCK DIAGRAM TIP Filter RING FSK Demodulator Output Circuit DOUT TRQ Carrier Detector DT1 CDET DT2 Filter (2130Hz) DTQ Detector Circuit (2130Hz) Level Detector Filter Time-constant Circuit AGND Filter (2750Hz) Bias Circuit Detector Circuit (2750Hz) STR CR DTDET Level Detector Crystal Oscillator Circuit OSCIN OSCOUT Power-down Circuit MODE S1 S0 VDD GND SEIKO NPC CORPORATION —3 SM8224C PIN DESCRIPTION Number Name I/O Function 1 AGND O Reference voltage output. Internal reference voltage (VDD/2) output level 2 TIP I Tip input. Connected to the telephone line through a protection circuit 3 RING I Ring input. Connected to the telephone line through a protection circuit 4 TRQ O Input-stage amplifier gain-select output. Used to adjust the gain of the input-stage amplifier. 5 GND – Ground. Connected to the system ground potential. 6 OSCIN I Crystal oscillator input. The crystal oscillator element is connected between this pin and OSCOUT. 7 OSCOUT O Crystal oscillator output. The crystal oscillator element is connected between this pin and OSCIN. 8 MODE I When MODE is HIGH, and S1 and S0 are both LOW, the device is in power-down state. See table 2. 9 TEST – TEST pin. Set OPEN when normal using. 10 DOUT O Data output. Demodulated FSK signal output. HIGH level output when CDET goes HIGH. 11 STR O 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. 12 DTDET O Dual-tone detector output. HIGH-level output when dual tone is detected. 13 CR I/O Dual tone RC time constant circuit connection. The dual tone detection signal passes through the RC network to generate the STR signal. 14 CDET O FSK signal carrier detector output. LOW-level when active carrier is detected. 15 VDD – Supply 16 S1 I Function select bit 1. Selects the device mode in combination with S0 and MODE. See table 2. 17 S0 I Function select bit 1. Selects the device mode in combination with S1 and MODE. See table 2. 18 DTQ O Dual-tone signal input-stage amplifier output. Used to adjust the gain of the input-stage amplifier. 19 DT2 I Dual-tone signal input-stage operational amplifier inverting input 20 DT1 I Dual-tone signal input-stage operational amplifier non-inverting input SEIKO NPC CORPORATION —4 SM8224C SPECIFICATIONS Absolute Maximum Ratings GND = 0V Parameter Symbol Condition Rating Unit Supply voltage range VDD −0.5 to 7.0 V Input voltage range VIN −0.3 to VDD + 0.3 V Power dissipation PD 100 mW Storage temperature range Tstg −55 to 155 °C Recommended Operating Conditions GND = 0V Rating Parameter Symbol Condition Unit min typ max Supply voltage VDD 2.7 – 5.5 V Clock frequency fCLK – 3.579545 – MHz Clock frequency accuracy ∆fC −0.1 – +0.1 % Operating temperature Topr −20 – 85 °C Electrical Characteristics VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max Supply current consumption IDD No analog signal input, no output load, S1 = 0V, S0 = VDD, MODE = 0V – – 8.0 mA Power-down current IDPD No analog signal input, other inputs = VDD or 0V, no output load, S1 = 0V, S0 = 0V, MODE = VDD – – 15 µA MODE, S0, S1 LOW-level input voltage VIL1 – – 0.3VDD V MODE, S0, S1 HIGH-level input voltage VIH1 0.7VDD – – V OSCIN LOW-level input voltage VIL2 – – 0.3VDD V OSCIN HIGH-level input voltage VIH2 0.7VDD – – V DOUT, STR, DTDET, CR, CDET LOW-level output current IOL 2 – – mA DOUT, STR, DTDET, CR, CDET HIGH-level output current IOH – – −0.8 mA TIP, RING, DT1, DT2, MODE, S1, S0 input leakage current IIN −1 – 1 µA SEIKO NPC CORPORATION —5 SM8224C AC Electrical Characteristics Measurement conditions: R1 = 430kΩ, R2 = 34kΩ, R3 = 390kΩ, C1= 0.22µF FSK decoder VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max – −43 CDON dBm FSKSNR 20 – – dB Carrier detection sensitivity CDON – −43 −37.78 dBm Carrier non-detection sensitivity CDOFF −50 −46 – dBm fCLK typ − 0.1% 3.579545 typ + 0.1% MHz Input sensitivity S/N ratio1 Oscillator frequency 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 85°C unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max Frequency (low frequency) fL – 2130 – Hz Frequency (high frequency) fH – 2750 – Hz Detection frequency deviation 1.1 – – % Non-detection frequency deviation 3.5 – – % −37.78 – – dBm Non-detection sensitivity – – −43.78 dBm Signal level deviation – – 6 dB Detection sensitivity Note: (S0, S1, MODE) = (VDD, 0V, 0V) Input-stage amplifier Characteristics VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max IIN – – 1 µA GOL 30 – – dB Unity gain frequency fC 80 – – kHz Load capacitance CL – – 100 pF Load resistance RL 50 – – kΩ Input leakage current DC open-loop voltage gain SEIKO NPC CORPORATION —6 SM8224C Timing Characteristics FSK decoder VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max Power-down release to start-up time tDOSC – 5 – ms Carrier detection ON time tDAQ 2.5 – 10 ms Final data to carrier detection OFF time tDCH 3 – 15 ms Output timing VDD = 2.7 to 5.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C, FSK input data = 1200 ± 12 baud unless otherwise noted. Rating Parameter Symbol Condition Unit min typ max STR, DOUT rise time tr0 – – 200 ns STR, DOUT fall time tf0 – – 200 ns Input/output delay tIDD – – 5 ms 1188 1200 1212 baud DOUT data rate Input to DOUT SEIKO NPC CORPORATION —7 SM8224C TIMING DIAGRAMS FSK demodulator timing 2nd Ring 1st Ring L1/L2 101010... 1 Data PDWN CDET tDCH tDAQ DOUT 101010...1 Data OSCOUT tDOSC PDWN is an internal signal (set by S0, S1, MODE) Output timing DOUT 90% DOUT 10% tr0 tf0 STR 90% STR 10% tf0 tr0 Data timing STOP START TIP/RING b6 b7 1 STOP START 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 b0 b1 b2 b3 b4 STOP 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 Description Modulation type Continuous-phase binary frequency-shift-keying Logic “1” data (mark) 1200 ± 12 Hz Logic “0” data (space) 2200 ± 22 Hz Signal level (mark) −32 to −12 dBm Signal level (space) −36 to −12 dBm Data transfer rate 1200 ± 12 baud Table 2. Function select S1 S0 MODE Function STR LOW LOW HIGH Power-down HIGH LOW (dual tone confirmation) HIGH LOW LOW Dual-tone detection from DT1/DT21 LOW HIGH LOW FSK and dual-tone detection from TIP/RING LOW (dual tone confirmation) HIGH HIGH LOW FSK detection from TIP/RING HIGH LOW Test mode2 LOW LOW 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% R6 1% R8 1% R9 1% VDD Protection Circuit R1 1% R2 1% R4 1% L1 C1 5% VDD R5 1% R3 1% L2 C1 5% R1 1% R2 1% 0.1µF 20% AGND DT1 TIP DT2 RING DTQ TRQ S0 GND S1 OSCIN R7 1% VDD VDD OSCOUT CDET MODE CR TEST DTDET DOUT STR 0.1µF 20% Note : Please set this capacitor nearby IC pin. Symbol Rating1 Unit R1 330 kΩ R2 27 kΩ R3 220 kΩ C1 0.001 µF R4 47.5 kΩ R5 60.4 kΩ R6 430 + 34 kΩ R7 390 kΩ C2 0.22 µF R8 52.3 kΩ R9 60.4 kΩ 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: [email protected] NC0021CE 2006.04 SEIKO NPC CORPORATION —11