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PDF BH3874AKS2 Data sheet ( Hoja de datos )
| Número de pieza | BH3874AKS2 | |
| Descripción | Sound processor IC | |
| Fabricantes | ROHM Semiconductor | |
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Audio ICs
Sound processor IC
BH3874AKS2
BH3874AKS2
The BH3874AKS2 is a sound control IC for mini-component stereo. 4-ch input selector, vocal fade, volume, surround, 5-
band graphic equalizer, dynamic bass, and 5-band spectrum analyzer are integrated into a single chip. Soft switch can
reduce the switching noise occurred when volume, vocal fade, surround, and dynamic bass are switched.
!Applications
Mini component stereo, Micro component stereo, CD radio cassette players, and TV.
!Features
1) A single chip IC integrates all functions of volume, tone control, and spectrum analyzer.
2) Soft switching can reduce the noise occured when volume, mode selector, surround, dynamic bass, and gain of
graphic equalizer are switched.
3) 4-ch input selector, mode selector, volume, surround, graphic equalizer, dynamic bass, and spectrum analyzer.
4) Built-in matrix surround, pseudo stereo circuit, and band pass filter for spectrum analyzer.
5) Low distortion and low noise due to the BiCMOS process adopting resistance ladder volume.
6) Filters of dynamic bass and biamp can be set freely by the combination of LPF and HPF.
!Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Power supply voltage
Power dissipation
VCC
Pd
Operating temperature range
Topr
Storage temperature range
Tstg
∗ Reduced by 12mW for each increase in Ta of 1°C over 25°C.
A standard board, 70×70×1.6mm, shall be mounted.
Limits
10.0
1200∗
−12 to +85
−55 to +125
Unit
V
mW
°C
°C
!Recommended operating conditions (Ta=25°C)
Parameter
Power supply voltage
Symbol
VCC
Min.
8.0
Typ.
−
Max.
9.5
Unit
V
1 page  
Audio ICs
Pin No. Pin name Pin voltage
63 F1L1
1 F1R1
7 F3L1
9 F3R1
VCC/2
64 F1L2
2 F1R2
8 F3L2
10 F3R2
VCC/2
15 F5L
16 F5R
VCC/2
Equivalent circuit
VCC
4k
16k
4k
10k
GND
VCC
GND
VCC
GND
VCC
16k
17k
17k
56 MIC
VCC/2
3 F2L1
5 F2R1
11 F4L1
13 F4R1
VCC/2
GND
VCC
GND
10k
3k
12k
4k
10k
4 F2L2
6 F2R2
12 F4L2
14 F4R2
VCC/2
VCC
GND
12k
BH3874AKS2
Pin description
A pin for setting graphic equalizer
frequency characteristic.
A pin for setting graphic equalizer
frequency characteristic.
A pin for setting graphic equalizer
frequency characteristic.
A pin for inputting a microphone
signal.
The input impedance is 10kΩ
(upon typical setting).
A pin for setting graphic equalizer
frequency characteristic.
A pin for setting graphic equalizer
frequency characteristic.
5 Page 
Audio ICs
BH3874AKS2
Parameter
Symbol Min. Typ. Max. Unit
Conditions
Simulated stereo maximum
voltage gain Lch
VMONL
6.5
8.5 10.5
dB
VIN=100mVrms
fIN=680Hz
Simulated stereo maximum
voltage gain Rch
VMONR
11.3
13.3
15.3
dB
VIN=100mVrms
fIN=680Hz
Input
pin
Measure-
ment
pin
[1]
[2]
[3]
Data setting
[4] [4] [5] [5]
[6]
[7]
[8]
Switch control table
SW SW SW SW SW
1/4 2/5 3/6 7 8
41,42
41,42
32
31
00 05 1B 04 0C 02 0A 06 91 07 1 1 1 2 1
Spectrum analyzer
maximum output level
VMAX 4.0 4.8 −
V VIN=−19dBV
41,42
41,42
39
Spectrum analyzer
output offset voltage
VOS
0 30 200 mV VIN=0Vrms
− 39
Spectrum analyzer
standard output level
VST 0.65 1.35 1.7
Ripple rejection
∗
RR
31 −
−
V
VIN=−37dBV
fIN=105Hz, 340Hz, 1kHz,
3.4kHz, or 10.5kHz
41,42
41,42
dB
VRR=100mVrms
fRR=100Hz, DIN AUDIO
30
39
32
31
47
C7
00 05 03 04 0C 02 0A 06 81 27 1 1 1 2 1
A7
67
47
C7
00 05 03 04 0C 02 0A 06 81 27 − − − − −
A7
67
47
C7
00 05 03 04 0C 02 0A 06 81 27 1 1 1 2 1
A7
67
00 15 03 04 0C 02 0A 06 81 07 1 2 − 2 1
Design against radiation-proof is not made.
∗ VP-9690A (Average value detection, effective value display) DIN AUDIO filter by Matsushita Communication is used for ∗ measurement.
11 Page | ||
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| PDF Descargar | [ Datasheet BH3874AKS2.PDF ] | |
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