BH3857AFV is a signal-processing IC for controlling audio quality in CD radio-cassette players and mini-component stereo systems. Three-line serial control is available making it easy to adjust tone and volume using a microprocessor.
The BH3857AFV is a signal‑processing IC designed for volume, tone and surround control in CD radio‑cassette players, mini‑component stereo systems and similar audio equipment. It supports three‑line serial control and also allows direct DC control of volume, bass, treble and surround functions.
The document provides a block diagram, pin descriptions, electrical specifications, timing charts, data tables, and example circuits for implementing the IC. It also includes operation notes on power supply ranges, noise considerations, and recommended external component values.
| Package | 40‑pin SSOP |
|---|---|
| Impedance of VC, TC, BC terminals | 10 kΩ (Typ.) |
| Impedance of SC terminal | 200 kΩ (Typ.) |
| Input amplifier gain | 0 dB |
| Volume control resolution | 256 steps (8 bits) |
| Tone control resolution | 32 steps (5 bits) |
| Maximum output port voltage | 15 V |
The VC, BC and TC terminals each have a typical impedance of 10 kΩ.
Volume data uses 8 bits, giving 256 possible steps.
The output ports must not be driven above 15 V.