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SM8224 Datasheet(PDF) 4 Page - Nippon Precision Circuits Inc |
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SM8224 Datasheet(HTML) 4 Page - Nippon Precision Circuits Inc |
4 / 11 page SM8224B NIPPON PRECISION CIRCUITS—4 PIN DESCRIPTION Number Name I/O Function 1 A G N D O Analog ground 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 T R Q O Input-stage amplifier gain-select output. Used to adjust the gain of the input-stage amplifier. 5 G N D – Ground. Connected to the system ground potential. 6 OSCIN I Cr ystal oscillator input. The cr ystal oscillator element is connected between this pin and OSCOUT. 7 OSCOUT O Cr ystal oscillator output. The cr ystal 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 pow er-down state. See table 2. 9 TEST – TEST pin. Set OPEN when nor mal using. 1 0 DOUT O Data output. Demodulated FSK signal output. HIGH level output when CDET goes HIGH. 1 1 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. 1 2 DTDET O Dual-tone detector output. HIGH-level output when dual tone is detected. 1 3 C R I/O Dual tone RC time constant circuit connection. The dual tone detection signal passes through the RC network to generate the S T R signal. 1 4 CDET O FSK signal carrier detector output. L OW -level when active carrier is detected. 1 5 V D D – Supply 1 6 S 1 I Function select bit 1. Selects the device mode in combination with S0 and MODE. See table 2. 1 7 S 0 I Function select bit 1. Selects the device mode in combination with S1 and MODE. See table 2. 1 8 D T Q O Dual-tone signal input-stage amplifier output. Used to adjust the gain of the input-stage amplifier. 1 9 D T 2 I Dual-tone signal input-stage operational amplifier inverting input 2 0 D T 1 I Dual-tone signal input-stage operational amplifier non-inverting input |
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