AVR 171 (serv.man3) - Harman Kardon Audio Service Manual (repair manual). Page 114

BD3812F

 

Audio ICs 

  

Rev.A 

1/2 

2 channel Volume IC 

 
 
BD3812F is a sound processor IC that has features of volume, and gain amplifier required for AV receiver and 
mini-component stereo. Up to 4 chips can be used with common bus line by chip select pin. 
 
 
zApplications                                                                                                                  zExternal dimensions 

(Unit : mm) 

SOP14

1

14

8.7±0.2

7

8

4.4±0.2

6.2±0.3

0.4±0.1

0.11

1.5±0.1

0.15±0.1

0.3Min.

1.27

0.1

AV receiver and mini stereo set. 
 
 
zFeatures 
1) Volume residual noise : 1.2

µ Vrms {Dynamic range : 131dB (IHF-A)} 

2) Volume is 2ch-independence. (0 to -103dB, MUTE 1dB / step) 
3) BUS is common and be possible to maximum 8channnel-ization of 

6ch-Volume IC. 

4) It can be controlled until 4 chips with common bus line at the same time. 
5) Maximum output voltage : 4.2Vrms (Vcc=7V, V

EE

=−7V, RL=10k

Ω) 

6) The serial data control of 2-wire type. (correspond to 3.3V and 5V) 
7) Built-in the convenient output gain amp.(0, 6 to 18dB, 2dB / step) for the 

adjustment of the output signal. 

8) Output mute be able to serial data and external mute terminal both. 
 
 
 
 
 
zAbsolute maximum ratings

 (Ta=25

°C) 

Impressed voltage

Power dissipation

Operating temperature

Storage temperature

Parameter

Unit

∗  

This value decreases 4.5mW/ ˚C for Ta=25˚C or more.

    A standard board,70  70  1.6mm, shall be mounted.

mW

˚C

˚C

V

Input voltage

Symbol

V

CC

−

V

EE

Pd

Topr

Tastg

V

IN

Limits

15

450

−

20 to 

+

75

−

55 to 

+

125

V

CC

+

0.3 to V

EE

−

0.3

V

∗

+ +

 

 
 
zOperating voltage range 

(Ta=25

°C) 

Power supply (Positive)

V

Power supply (Negative)

V

Parameter

5

−

5

Min.

7.3

−

7.3

Max.

Unit

−
−

Typ.

V

CC

−

GND

V

EE

−

GND

Symbol

 

 
 
 
 
 
 

Harman Kardon

AVR 171 Service Manual

Page 114 of 174