ROHM BA7760F, BA7760 Datasheet
1
Multimedia ICs
Microphone Amplifier
BA7760 / BA7760F
The BA7760 and BA7760F are dual microphone amplifiers designed for audio signal amplification. These are low
noise amplifiers with a low -122dBV (typically) equivalent input noise voltage. Each IC has an internal mixer buffer
amplifier for the mixing of signals from two channels. When used with the BA7725S or BA7725FS, the BA7726AS or
BA7726AFS and BU9252S or BU9252F, these ICs simplify the configuration of digital echo systems with two inputs
(for karaoke duets, for instance).
•
Features
1) Internal 2-channel low noise microphone amplifier.
2) Internal mixer buffer amplifier with mute function.
3) Available in 2 types of packages: DIP 14-pin or SOP
14-pin.
•
Applications
Audio equipment with karaoke features, VCRs, LDs, etc.
•
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
Applied voltage 15 V
BA7760
mW
BA7760F
Operating temperature °C
Storage temperature °C
V
CC
Power
dissipation
600
∗
1
450
∗
2
Pd
Topr – 25 ~ + 75
– 55 ~ + 125Tstg
∗
1 Unmounted. Reduced by – 6.0mW for each increase in Ta of 1°C over 25°C.
∗
2 Unmounted. Reduced by – 4.5mW for each increase in Ta of 1°C over 25°C.
•
Recommended operating conditions
Parameter Symbol Limits Unit
Power supply voltage V
CC 6 ~ 14 V
2
Multimedia ICs BA7760 / BA7760F
•
Pin descriptions
Pin name Pin type
1 Ripple filter
2GND GND —
3 MIC IN ( + ) Ch1 CH1 microphone amplifier input ( + )
4 MIC IN ( – ) Ch1 CH1 microphone amplifier input ( – ) Base (NPN)
5 CH1 microphone amplifier fc Base (NPN) ~ 450Ω
6 CH1 microphone amplifier output Push-pull
7 Mixer buffer input
8 Mixer buffer output Push-pull
9 CH2 microphone amplifier output Push-pull
10 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 ( + )
13 Mute control Fig.1
14 —
RIPPLE FILTER
FILTER Ch1
MIX IN
MIC OUT Ch1
MIX OUT
MIC OUT Ch2
FILTER Ch2
MUTE CTRL
V
CC VCC
Base (NPN) // 15kΩ
Base (NPN) // 120kΩ
Base (NPN) // 65kΩ
Base (NPN) // 120kΩ
Pin No. Function
∗
“Parallel” and “series” respectively refer to parallel and series insertion. All figures are standard values.
•
Block diagram
+
–
–
+
–
+
8
9
10
11
12
13
14 1
2
3
4
5
6
7
GND
MIX IN
MIC OUT Ch1
FILTER Ch1
RIPPLE FILTER
MIX OUT
MUTE CTRL
V
CC
MIC IN Ch1 ( – )
MIC IN Ch1 ( + )
MIC AMP CH 1
MIC AMP CH 2
MIX BF
MIC OUT Ch2
FILTER Ch2
MIC IN Ch2 ( + )
MIC IN Ch2 ( – )
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