1
Multimedia ICs
Vocal fader IC with input selector
BH3810FS
The BH3810FS is a vocal fader IC that is serial control compatible. It has mode switching that also includes a voice
multiplexing mode, a five-input selector, a gain selector and other such features, which can all be controlled serially.
Eight open-collector terminals and two tri-state terminals are provided on the chip to facilitate control by other ICs.
Applications
Component stereo systems, CD radio cassette players, TVs and car stereos.
Features
Absolute maximum ratings (Ta = 25C)
Recommended operating conditions (Ta = 25C)
Parameter
Applied voltages
Power dissipation
Operating temperature
Storage temperature
V
DD
Pd
Topr
Tstg
+ 5.5
850
40 ~ + 85
55 ~ + 125
V
V
EE
4.5
Symbol
Limits
Unit
mW
C
C
Maximum open collector voltage
V
OP
14
V
Reduced by 8.5mW for each increase in Ta of 1
C over 25
C ,
when mounted on a 50mm
50mm
1.6mm board.
1) Built-in low-pass filter can perform vocal fader func-
tion (erasing of vocals from commercially available
music software) using just one chip.
2) Serial control can be used to switch between vocal
fader, through, multiplex, and mute modes.
3) Built-in gain selector allows selection of gain from
6dB to 20dB in 2dB steps.
4) Five-channel input selector.
5) Mic. mixing amplifier with mute function. Key con-
troller input also provided.
6) SSOP-A32 pin package.
Parameter
Power supply voltage
V
DD
4.0 ~ 5.3
V
V
EE
4.3 ~ 3.0
V
Symbol
Limits
Unit
3
Multimedia ICs
BH3810FS
Electrical characteristics (unless otherwise notes, Ta = 25C, V
DD
= 5V, V
EE
= 4V, G = 14dB, f =1kHz,
Rg = 600
, V
IN
= 150mV, and R
L
= 100k
)
Parameter
Quiescent current
Maximum output voltage
I
Q1
+
I
Q1
I
Q2
+
I
Q2
Vom
mA
Symbol
--
--
--
--
1.5
Min.
4.5
4.1
10.0
7.6
2.2
Typ.
10.0
10.0
20.0
20.0
--
V
rms
Max.
Unit
Conditions
mA
mA
mA
THD = 1%, through mode
L, R gain
G
VT
11
14
17
dB
Through mode
Low-frequency gain
G
VF
8
11
14
dB
Vocal fader mode, f = 100Hz
Microphone gain
G
VM
5
8
11
dB
Crosstalk
CT
54
64
--
dB
f = 1kHz, through mode
f = 1kHz, mute mode or input mute
Mute attenuation
MU
60
80
--
dB
Vocal suppression ratio
SV
15
20
--
dB
Vocal fader mode, f = 1kHz
Total harmonic distortion
THD
--
0.004
0.05
%
V
O
= 1V
rms
, through mode, BW 400Hz
to 30kHz
Noise level
V
N
--
15
22
V
rms
R
g
= 0, DIN AUDIO
Mode switch output DC
differential
DCB
--
0
18
mV
Between each mode with key controller on
Input impedance
R
IN
35
50
65
k
Pins 1 to 5, pins 26, pins 28 to 32
Input selector crosstalk
CT
IN
80
--
--
dB
f = 1kHz
"L" output voltage
V
OL
--
0.15
0.5
V
Pins 17 to 27, I
OL
= 5mA
"H" output leakage current
I
OH
--
0
2.0
A
Pins 17 to 24, 13V applied to collector
Tri-state "H" output voltage
V
SOH
4.5
4.85
--
V
Pins 15 to 16, Io = 1mA
Tri-state "L" output voltage
V
SOL
--
0.05
0.5
V
Pins 15 to 16, Io = 1mA
SI pin source current (pin 13)
I
SI
--
0.4
10
A
When SI pin is at DGND potential
SCK pin source current (pin 14)
I
SCK
--
0.2
10
A
When SCK pin is at DGND potential
Pins 17 to 24, 0.5V between PORT
terminal and GND voltage = 0.5V
Port output current
I
PMax.
5.0
12
--
mA
Through mode V
EE
current
Through mode V
DD
current
Through mode D9 to D16 data1
Through mode D9 to D16 data1
Measured using a Matsushita VP-9690A (average value detector, effective value display) DIN AUDIO filter.
Operating specifications: same phase for the input and output signals.
Not designed for radiation resistance.
--
5
Multimedia ICs
BH3810FS
Circuit operation
(1) About the data format
Data
Descri-
ption
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 D21 D22
17pin 18pin 19pin 20pin 21pin 22pin 23pin 24pin
15pin
16pin
Input
selector
Input
selector
Mode
selector
Open collector port
Tri-state
port
Tri-state
port
Mic.
mute
Chip
select
3bit
Bit number
3bit
3bit
8bit
2bit
2bit
1bit
2bit
D23
MSB
24 bits total
LSB
Fig.2
Data format
Pin
name
Data
0
1
1
(24pin)
PORT
D16
2
(23pin)
PORT
D15
3
(22pin)
PORT
D14
4
(21pin)
PORT
D13
5
(20pin)
PORT
D12
6
(19pin)
PORT
D11
7
(18pin)
PORT
D10
8
(17pin)
PORT
D9
Current sink OFF
Current sink ON
Output port: open collector
D22
D23
0
0
Address is "00"
Mode selector
Gain selector
Mic
Key controller
Input selector
Through mode
6dB
Mute OFF
OFF
LA, RA
At power on
D19
PORT9 (16pin)
D19, D20
D20
Mode
LOW
0
0
OPEN
0
1
OPEN
1
0
HI
1
1
D17
PORT10 (15pin)
D17, D18
D18
Mode
LOW
0
0
OPEN
0
1
OPEN
1
0
HI
1
1
Tri-state
D21
Mode
Mic. ON
0
Mic. MUTE
1
Mic. mute
Output port: current attraction OFF
Tri-state port: Low
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