Multimedia ICs
Headphone / speaker amplifier
BA7785FS
The internal linear audio circuits of the BA7785FS include a ster...
Multimedia ICs
Headphone / speaker amplifier
BA7785FS
The internal linear audio circuits of the BA7785FS include a stereo headphone amplifier, BTL monaural speaker amplifier, and an electronic volume circuit, making this IC ideal for LCD TVs and notebook computers.
Applications
LCD TVs, notebook computers, and wordprocessors, etc.
Features
1) Internal stereo headphone amplifier that allows for mixed input, along with a BTL monaural speaker amplifier.
2) Internal anti-pop circuit, which prevents popping sounds when the power is turned on.
3) Internal electronic volume and mute circuit.
4) Low-
voltage operation (3.3V). 5) Internal input switch that also allows for the input of
computer beeps.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Power supply
voltage Power dissipation
VCC Pd
Operating temperature
Topr
Storage temperature
Tstg
∗ Reduced by 7.5mW for each increase in Ta of 1°C over 25°C.
When mounted on a 90 × 50 × 1.6mm glass epoxy board.
Limits 18 750∗
– 10 ~ + 70 – 55 ~ + 125
Unit V
mW °C °C
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ.
Power supply
voltage SP / HP VCC 3.0
—
Max. 6.0
Unit V
1
Multimedia ICs
Block diagram
BA7785FS
EVR CTRL
1
LINE IN (L)
2
MUTE CTRL
3
R
VR
LINE IN (R)
4
R
BIAS IN
5
VR
MIX OUT
6
MIX Amp
SP IN 1
7
SP IN 2
8
SP IN CTRL
9
SP ON / OFF
10
6dB HP Amp
HP Amp
6dB
RR
6dB SP Amp
INV SP Amp
6dB
20 HP VCC 19 HP OUT (L) 18 HP OUT (R) 17 HP GND 16 SP VCC 15 FILTE...