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Электронный компонент: BA7655A

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Multimedia ICs
Dual Voltage-controlled Amplifier
BA7655A / BA7655AF
The BA7655A and BA7655AF are dual voltage-controlled amplifier ICs designed for use in camcorders and VCRs.
By varying the control voltage the amplifier gain can varied from -6dB to +6dB. When the control pin voltage drops
below 1V the amplifier enters Power Save Mode which mutes the output and reduces the current drawn by the IC.
Applications
Video cassette recorders and camcorders
Features
1) Wide bandwidth.
2) Wide dynamic range.
3) Low power cousumption.
4) Output muting possible.
5) Low voltage gain temperature drift.
Block diagram
VCA2
VCA1
GND
OUT1
CTL1
IN1
IN2
CTL2
OUT2
5
6
7
8
1
2
3
4
V
CC
2
Multimedia ICs
BA7655A / BA7655AF
Pin descriptions
Pin name
1
IN1
Input 1
2
CTL1
Control 1
3
OUT1
Output 1
4
GND
GND
5
OUT2
Output 2
6
CTL2
Control 2
7
IN2
Input 2
8
V
CC
Power supply
Pin No.
Function
Input circuits
2, 6
1, 7
3, 5
V
CC
V
CC
40k
40k
V
CC
(Typ.)
(Typ.)
3.0V (Typ.)
1m (Typ.)
2.5V
(Typ.)
Absolute maximum ratings
Parameter
Symbol
Unit
Power supply voltage
V
CCMax.
8.0
V
Power dissipation
Pd
500 (BA7655A : DIP8)
1
350 (BA7655AF : SOP8)
2
mW
Operating temperature
Topr
C
Storage temperature
Tstg
C
20 ~ + 80
55 ~ + 125
1 Reduced by 5.0mW for each increase in Ta of 1
C over 25
C.
2 Reduce by 3.5mW for each increase in Ta of 1
C over 25
C, when mounted on a 50mm
50mm.
Limits
Recommended operating conditions (Ta = 25C)
Parameter
Symbol
Limits
Unit
Power supply voltage
V
CC
4.5 ~ 5.5
V
3
Multimedia ICs
BA7655A / BA7655AF
Electrical characteristics (unless otherwise noted , Ta = 25C , V
CC
= 5.0V)
Not designed for radiation resistance.
Items marked with an asterisk are rerference values.
Parameter
Symbol
Min.
Typ.
Max.
Unit
Voltage
Conditions
Supply current
One channel
ICC1
--
4.6
7.0
mA
3.0
Set control voltage to 1V or less,
when only one channel is used.
Both channels
ICC2
--
7.8
12.0
Maximum output voltage
VMax.
2.5
2.8
--
V
P-P
5.0
Frequency characteristics
Gf
1.0
0.0
dB
3.0
Minimum voltage gain
GVMin. 8.0
6.0
4.0
dB
2.0
f = 1MHz
Maximum voltage gain
GVMax.
4.0
6.0
8.0
dB
5.0
f = 1MHz
Secondary harmonic distortion
2HD
--
40
--
dB
3.0
Audio distortion
AD
--
1.0
--
%
3.0
Muting output voltage
VMUTE
--
--
100
mV
1.0
Set control voltage to 1 V or less
V S / N
--
60
--
dB
3.0
A S / N
--
60
--
dB
3.0
Audio
S / N
Video
S / N
1.0
f = 1kHz, THD = 1%
f = 13MHz / 1MHz, V
IN
= 0.5V
P-P
f = 5.0M, V
IN
= 1V
P-P
f = 1kHz, V
IN
= 1V
P-P
Circuit operation
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
POWER SAVE MODE
8
6
4
2
0
2
4
6
8
10
12
14
Control voltage (V)
GAIN (dB)
Fig. 1 Voltage gain vs.
control voltage characteristics
The gain of a VCA (voltage-controlled amplifier) can be
varied by an external control voltage. By varying the
control voltage from 2V to 5V (in the case of a 5V
power supply), the gain of the amplifiers in this IC can
be varied over the range -6dB to +6dB (see Figs. 1
and 2 below).
When only one of the two amplifiers is being used, by
setting the voltage on the CTL pin of the unused ampli-
fier to 1V or less, it can be put into Power Save Mode.
In Power Save Mode, the circuit current for the IC is
cut by 40%, and the output is muted.
VCA
IN
OUT
Control voltage
Fig. 2
CTL Voltage
Status
2V ~ 5V
Variable gain
1V or less
Power save
4
Multimedia ICs
BA7655A / BA7655AF
Electrical characteristic curves
1M
10M
100M
10.0
8.0
6.0
4.0
2.0
0.0
100K
2.0
4.0
6.0
10.0
8.0
CONTROL VOLTAGE = 5V
CONTROL VOLTAGE = 3V
CONTROL VOLTAGE = 2V
VOLTAGE GAIN : V
G
(dB)
V
CC
= 5V
V
IN
= 0.5V
P-P
FREQUENCY :
f (Hz)
Fig. 3 Voltage gain vs.
frequency
7
6.5
6
5.5
5
0
25
50
75
100
25
50
Max. VOLTAGE GAIN (dB)
AMBIENT TEMPERATURE : Ta (
C)
V
CC
= 5V
Fig. 4 Maximum voltage gain vs.
ambient temperature
1
0.5
0
0
25
50
75
100
0.5
1
50
25
Typ. VOLTAGE GAIN (dB)
AMBIENT TEMPERATURE : Ta (
C)
V
CC
= 5V
Fig. 5 Voltage gain vs.
temperature
0
25
50
75
100
5
5.5
6
6.5
7
50
25
Min. VOLTAGE GAIN (dB)
AMBIENT TEMPERATURE : Ta (
C)
V
CC
= 5V
Fig. 6 Minimum voltage gain vs.
temperature
External dimensions (Units: mm)
BA7655A
BA7655AF
DIP8
SOP8
0.5
0.1
3.2
0.2
3.4
0.3
8
5
1
4
9.3
0.3
6.5
0.3
0.3
0.1
0.51Min.
2.54
0
~ 15
7.62
0.4
0.1
1.27
0.15
0.3Min.
0.15
0.1
0.11
6.2
0.3
4.4
0.2
5.0
0.2
8
5
4
1
1.5
0.1