SM8223B is NIPPON PRECISION CIRCUITS INC. FSK Decoder and DTMF Receiver IC manufactured by Nippon Precision Circuits Inc.
| Part Number | Description |
|---|---|
| SM8223A | FSK Decoder and DTMF Receiver |
| SM8220 | Calling Number Identification Receiver |
| SM8221 | Calling Number Identification Receiver |
| SM8222A | Caller ID Service |
| SM8224B | Dual-Tone Receiver |
Connected to the telephone line through a protection circuit I Ring input. Connected to the telephone line through a protection circuit O Input-stage amplifier gain-select output. Used to adjust the gain of the input-stage amplifier.
