Sound Processor IC
BH3878KS2
Description
Dimension (Units : mm)
Features
00W025A
May, 2001
Absolute Maximum Ratings (Ta=25C)
Applications
Power supply voltage
Power dissipation
Operating temperature range
Storage temperature range
Parameter
Symbol
Limits
Unit
Vcc
Pd
Topr
Tstg
10.0
1200
+
70
+
125
20
55
~
~
mW
C
C
V
Power supply voltage
Vcc
9
8.5
9.5
V
Recommended Operating Conditions (Ta=25C)
Parameter
Min.
Max.
Unit
Typ.
Symbol
Derating : 12.0mW/C for operation above Ta=25C
BH3878KS2 is a sound controller IC for mini component
stereo. 5-channel input selector, vocal fader, volume,
surround, 5-band graphic equalizer, dynamic bass, and
5-band spectrum analyzer are all integrated into this single
chip. Switching noise is reduced when volume, vocal fader,
surround and dynamic bass are changed by soft switch.
1) All in one chip IC incorporating functions of volume, tone,
and spectrum analyzer.
2) Soft switching that can reduce the stepping switching noise
when volume, mode selector, surround, dynamic bass and
the gain of graphic equalizer are switched.
3) 5-channel input selector, mode selector, volume, surround
graphic equalizer, dynamic bass, and spectrum analyzer
can be controlled by serial control from micro controller.
4) Built-in matrix surround, B.P.F for spectrum analyzer.
5) Low distortion, low noise by BiCMOS process using
resistance ladder type volume.
6) Mode of dynamic bass and bi-amplifier can be switched.
Mini component stereo, micro component stereo, CD radio cassette player, TV
SQFP-T64
49
64
1
.
4
0
.
1
0
.
1
1
4
.
0
0
.
3
1
2
.
0
0
.
2
0.3
0.1
0.65
1
17
16
32
0.125
0.1
0. 15
0
.
5
12.0
0.2
14.0
0.3
48
33
Block Diagram
Circuit current at no signal
IQ
--
2.0
0.8
--
--
--
70
86
25
9
40
2.5
2.8
0.01
35
5
80
95
30
12
60
--
4.8
0.05
50
20
--
--
--
15
mA
Vrms
dB
%
Vrms
Vrms
dB
dB
dB
dB
VOM
GV
THD
VNO
VMNO
CT
ATTMAX
GVF
VGQB
Maximum output voltage
Voltage gain
Total harmonic distortion rate
Output noise voltage
Residual noise voltage
Cross talk
Volume maximum attenuation
Vocal fader suppressed quantity
Graphic equalizer gain
At no signal
THD=1%
Vo=1Vrms, 400Hz-30kHz BPF
Rg=0
, Biamp=0dB, DIN AUDIO
Rg=0
, Volume=
Biamp=0dB, DIN AUDIO
Rg=0
, Biamp=0dB, DIN AUDIO
Vin=200mVrms
fin=100Hz, 300Hz,1kHz,3kHz, or 10kHz
Electrical characteristics (
Unless otherwise noted; Ta=25C, Vcc=9V, f=1kHz, Rg=600
, RL=10k,
Vin=800mVrms, INPUT SELECTOR=Ach, MODE SELECTOR=through, VOLUME=0dB, SURROUND=0dB,
GRAPHIC EQUALIZER=0dB, DYNAMIC BASS=0dB, SPECTRUM ANALYZER=RESET)
5
15
0.6
4.0
7
18
2.6
4.8
9
21
4.6
--
dB
dB
dB
V
VSUMAX
VBB
GMIC
VMAX
Surround maximum voltage gain
Dynamic bass boost gain
Microphone voltage gain
Spectrum analyzer max. output level
Vin=300mVrms, fin=1kHz
Vin=100mVrms, fin=75Hz, 23pin=GND
Vin=400mVrms
Vin=12dBV
Symbol
Min.
Max.
Unit
Conditions
Typ.
Parameter
3
0
2
9
3
1
3
5
3
4
3
3
1
6
1
4
1
3
1
0
D
E
T
D
E
T
D
E
T
D
E
T
D
E
T
4
0
2
2
1
0
.
5
K
H
z
3
.
4
K
H
z
2
0
A
L
C
C
A
L
C
R
H
P
F
R
3
H
P
F
R
2
H
P
F
R
1
F
5
R
F
4
R
2
F
4
R
1
F
3
R
2
F
3
R
1
F
2
R
2
F
2
R
1
F
1
R
2
F
1
R
1
B
P
O
U
T
C
B
A
B
P
N
F
F
5
L
F
4
L
2
F
4
L
1
F
3
L
2
F
3
L
1
F
2
L
2
F
2
L
1
F
1
L
2
F
1
L
1
P
S
1
P
S
E
F
F
E
C
T
R
E
C
L
D
P
L
L
1
D
P
L
L
2
D
P
L
R
1
D
P
L
R
2
M
I
C
V
F
C
2
V
F
C
1
M
O
D
E
S
E
L
E
C
T
O
R
H
P
F
L
3
H
P
F
L
2
H
P
F
L
1
B
A
S
S
2
B
A
S
S
1
39 1 2 5 6 9 10 13 14 16
FILTER
DIGITAL
CONTROL
VCA
HPF
HPF
ALC
BH3878KS2
36
40
37 38
20 21 22
2
2
24 23
63 64
5
9
60
58
57
59
51
56
55
53
60
49
47
45
43
41
5dB
6dB
5dB
6dB
2.8dB
2.8dB
L-R
2.6dB
10K
10K
105Hz
340Hz
1KHz
3.4Hz
10.5KHz
22K
0~30dB
30dB
~
Vcc
Vcc
5BAND EQ
5BAND EQ
44
42
46
48
50
52
3 4 7 8 11 12 15
17 18 19
25 26
30
28
3
0
54
3
0
32
27
29
31
35
34
33
MPX
DET
DET
DET
DET
DET
STEPC
SI
SCK
OUTR
CAP
BASS3
OUTL
GND
FILTER
VCC
INLE
INLD
INLC
INLB
INLA
INRA
INRB
INRC
INRD
INRE
RECR
1
2
DIN AUDIO
52
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