00W025A
Sound Processor IC
BH3878KS2
Description
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.
Features
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.
Applications
Mini component stereo, micro component stereo, CD radio cassette player, TV
Absolute Maximum Ratings (Ta=25˚C)
Parameter
Power supply voltage
Power dissipation
Operating temperature range
Storage temperature range
∗
Derating : 12.0mW/˚C for operation above Ta=25˚C
Symbol
Vcc
Pd
Topr
Tstg
Limits
10.0
1200
∗
–
20
~
+
70
Unit
V
mW
Dimension (Units : mm)
14.0±0.3
12.0±0.2
48
33
14.0±0.3
12.0±0.2
49
32
0.5
0.125±0.1
0. 15
64
1
0.65
16
17
1.4±0.1
0.1
0.3±0.1
SQFP-T64
–
55
~
+
125
˚C
˚C
Recommended Operating Conditions (Ta=25˚C)
Parameter
Power supply voltage
Symbol
Vcc
Min.
8.5
Typ.
9
Max.
9.5
Unit
V
May, 2001
Electrical characteristics (
Unless otherwise noted; Ta=25˚C, Vcc=9V, f=1kHz, Rg=600Ω, RL=10kΩ,
Parameter
Circuit current at no signal
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
Surround maximum voltage gain
Dynamic bass boost gain
Microphone voltage gain
Symbol
IQ
VOM
GV
THD
VNO
VMNO
CT
ATTMAX
GVF
VGQB
VSUMAX
VBB
GMIC
Min.
—
2.0
0.8
—
—
—
70
86
25
Typ.
40
2.5
2.8
0.01
35
5
80
95
30
Max.
60
—
4.8
0.05
50
20
—
—
—
Unit
mA
Vrms
dB
%
µVrms
µVrms
dB
dB
dB
dB
dB
dB
dB
V
Vin=800mVrms, INPUT SELECTOR=Ach, MODE SELECTOR=through, VOLUME=0dB, SURROUND=0dB,
GRAPHIC EQUALIZER=0dB, DYNAMIC BASS=0dB, SPECTRUM ANALYZER=RESET)
Conditions
At no signal
THD=1%
Vo=1Vrms, 400Hz-30kHz BPF
Rg=0Ω, Biamp=0dB, DIN AUDIO
Rg=0Ω, Volume=–
∞
Biamp=0dB, DIN AUDIO
Rg=0Ω, Biamp=0dB, DIN AUDIO
DIN AUDIO
Vin=200mVrms
fin=100Hz, 300Hz,1kHz,3kHz, or 10kHz
Vin=300mVrms, fin=1kHz
Vin=100mVrms, fin=75Hz, 23pin=GND
Vin=400mVrms
Vin=–12dBV
±
9
5
15
0.6
4.0
±
12
7
18
2.6
4.8
±
15
9
21
4.6
—
Spectrum analyzer max. output level VMAX
Block Diagram
DPLL1
DPLL2
DPLR1
DPLR2
RECL
VFC1
VFC2
F1L1
F1L2
F2L1
F2L2
F3L1
F3L2
F4L1
F4L2
F5L
PS1
MIC
BASS1
BASS2
25 26
Vcc
1
2 Vcc
30 VCC
28 FILTER
54 GND
32 OUTL
27 BASS3
VCA
FILTER
29 CAP
29
30
30
53 55 56
–5dB
INLE 49
–6dB
INLD 47
INLC 45
INLB 43
INLA 41
MODE SELECTOR
2.8dB
51
57 58 59 60
59
60
63 64 3 4 7 8 11 12 15
0~30dB
–30dB
~
–
∞
HPFL1
HPFL2
HPFL3
17 18 19
HPF
30
10K
2.6dB
L-R
EFFECT
PS
5BAND EQ
10K
2.8dB
5BAND EQ
INRA 42
INRB 44
INRC 46
INRD 48
–6dB
INRE 50
–5dB
RECR 52
31 OUTR
31
105Hz
340Hz
1KHz
3.4Hz
3.4KHz 10.5KHz
HPF
DET
DET
DET
DET
DET
ALC
MPX
33 STEPC
33
10.5KHz
DET DET DET DET DET
DIGITAL
CONTROL
35 SCK
34 SI
40
22K
BH3878KS2
36 37 38 39 1 2 5 6 9 10 13 14 16
16
14
13
10
35
34
20 21 22
22
24 23
22
BPOUT
F1R1
F1R2
F2R1
F2R2
F3R1
F3R2
F4R1
F4R2
F5R
BPNF
A
B
C
HPFR1
HPFR2
HPFR3
ALCR
ALCC
40
20
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