Multimedia ICs
•Block diagram
–
– MIC AMP CH 1
MIC AMP CH 2
–
BA7760 / BA7760F
•Pin descriptions
Pin No.
Pin name
Function
Pin type
1 RIPPLE FILTER Ripple filter
Base (NPN) // 15kΩ
2 GND
GND
—
3 MIC IN ( + ) Ch1 CH1 microphone amplifier input ( + ) Base (NPN) // 120kΩ
4 MIC IN ( – ) Ch1 CH1 microphone amplifier input ( – ) Base (NPN)
5 FILTER Ch1
CH1 microphone amplifier fc
Base (NPN) ~ 450Ω
6 MIC OUT Ch1 CH1 microphone amplifier output
Push-pull
7 MIX IN
Mixer buffer input
Base (NPN) // 65kΩ
8 MIX OUT
Mixer buffer output
Push-pull
9 MIC OUT Ch2 CH2 microphone amplifier output
Push-pull
10 FILTER Ch2
CH2 microphone amplifier fc
Base (NPN) ~ 450Ω
11 MIC IN ( + ) Ch2 CH2 microphone amplifier input ( – ) Base (NPN)
12 MIC IN ( – ) Ch2 CH2 microphone amplifier input ( + ) Base (NPN) // 120kΩ
13 MUTE CTRL
Mute control
Fig.1
14
VCC
VCC
—
∗ “Parallel” and “series” respectively refer to parallel and series insertion. All figures are standard values.
2