LC75421M Description
ENN6866A CMOS IC LC75421M Electronic Volume Controller for Cars Overview The LC75421M is an electronic volume controller that enables control of volume, balance, fader, bass/treble + super bass, input switching, and input and output level control functions using only a small number of external ponents.
LC75421M Key Features
- On-chip buffer amplifier cuts down number of external ponents
- Low switching noise generated by on-chip switch due to use of silicon gate CMOS process
- On-chip reference voltage circuit for analog ground
- Controls performed with serial input (CCB)
- Volume: 0 dB to -79 dB in 1-dB steps, and -∞ (81 positions) Balance function with separate L/R control
- Bass/treble: A tone control circuit can be configured using an external RC, with 15-position control from 0 dB to ±11.9
- Input gain: 0 dB to +18.75 dB (1.25-dB steps) amplification is possible for the input signal
- Output gain: Fader output can be selected among 0 dB, +6.5 dB, and +8.5 dB
- Input switching: Five input signals can be selected for Left and for Right
- Super bass: Step control with 11 positions is possible, with peaking characteristics (type T)