SM8224B is Dual-Tone Receiver manufactured by Nippon Precision Circuits Inc.
| Part Number | Description |
|---|---|
| SM8220 | Calling Number Identification Receiver |
| SM8221 | Calling Number Identification Receiver |
| SM8222A | Caller ID Service |
| SM8223A | FSK Decoder and DTMF Receiver |
| SM8223B | NIPPON PRECISION CIRCUITS INC. FSK Decoder and DTMF Receiver IC |
Internal reference voltage (V D D /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.
