Harman Kardon AVR 171/230, Service Manual

Page: 114 / 174

BD3812F
Audio ICs
Rev.A 1/2
2 channel Volume IC
BD3812F
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.
z
Applications
z
External 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.
z
Features
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.
z
Absolute 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
∗
+ +
z
Operating 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