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SM8224CM Fiches technique(PDF) 4 Page - Nippon Precision Circuits Inc |
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SM8224CM Fiches technique(HTML) 4 Page - Nippon Precision Circuits Inc |
4 / 11 page SM8224C SEIKO NPC CORPORATION —4 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 |
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