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Part: BA7655A
Category:
Multimedia
Description:
Company: ROHM Electronics
Datasheet: Download BA7655A datasheet File size : 124 kB
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Datasheet text preview:
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.
pp cations ·iAeolicassette recorders and camcorders Vd
eatu ·)FWideres 1 bandwidth. 2) Wide dynamic range. 3) Low power cousumption.
4) Output muting possible. 5) Low voltage gain temperature drift.
·Block diagram
VCC 8 IN2 7 CTL2 6 OUT2 5
VCA2
VCA1
1 IN1
2 CTL1
3 OUT1
4 GND
1
Multimedia ICs
BA7655A / BA7655AF
·Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 Pin name IN1 CTL1 OUT1 GND OUT2 CTL2 IN2 VCC Input 1 Control 1 Output 1 GND Output 2 Control 2 Input 2 Power supply Function
·Input circuits
40k
(Typ.)
VCC
VCC
VC C
40k
(Typ.)
3, 5 2.5V (Typ.) 1, 7 2, 6 3.0V (Typ.)
1m (Typ.)
·Absolute maximum ratings
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCCMax. Pd Topr Tstg Limits 8.0 500 (BA7655A : DIP8)1 350 (BA7655AF : SOP8)2 20 ~ + 80 55 ~ + 125 Unit V mW °C °C
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.
·Recommended operating conditions (Ta = 25°C)
Parameter Power supply voltage Symbol VCC Limits 4.5 ~ 5.5 Unit V
2
Multimedia ICs
BA7655A / BA7655AF
·Electrical characteristics (unless otherwise noted , Ta = 25°C , VCC = 5.0V)
Parameter Supply current One channel Both channels Symbol ICC1 ICC2 VMax. Gf Min. -- -- 2.5 1.0 Typ. 4.6 7.8 2.8 0.0 Max. 7.0 12.0 -- 1.0 4.0 8.0 -- -- 100 -- -- Unit mA VP-P dB dB dB dB % mV dB dB Voltage 3.0 5.0 3.0 2.0 5.0 3.0 3.0 1.0 3.0 3.0 Conditions Set control voltage to 1V or less, when only one channel is used. f = 1kHz, THD = 1% f = 13MHz / 1MHz, VIN = 0.5VP-P f = 1MHz f = 1MHz f = 5.0M, VIN = 1VP-P f = 1kHz, VIN = 1VP-P Set control voltage to 1 V or less Maximum output voltage Frequency characteristics Minimum voltage gain Maximum voltage gain Secondary harmonic distortion Audio distortion Muting output voltage Video Audio S/N S/N
GVMin. 8.0 6.0 GVMax. 2HD AD VMUTE VS/N AS/N 4.0 -- -- -- -- -- 6.0 40 1.0 -- 60 60
Items marked with an asterisk are rerference values.
Not designed for radiation resistance.
cuit ·hCeirgainoperation (voltage-controlled amplifier) can be T of a VCA 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 amplifier 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.
8 6 4 2 GAIN (dB) 0 2 4 6 8 10 12 14 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Control voltage (V) POWER SAVE MODE
Fig. 1 Voltage gain vs. control voltage characteristics
IN VCA
OUT
CTL Voltage 2V ~ 5V Variable gain Power save
Status
Control voltage
1V or less
Fig. 2
3
Multimedia ICs
BA7655A / BA7655AF
·Electrical characteristic curves
10.0 8.0 VOLTAGE GAIN : VG (dB) 6.0 4.0 2.0 CONTROL VOLTAGE = 3V 0.0 2.0 4.0 6.0 CONTROL VOLTAGE = 2V CONTROL VOLTAGE = 5V VCC = 5V VIN = 0.5VP-P Max. VOLTAGE GAIN (dB)
7 VCC = 5V 6.5 Typ. VOLTAGE GAIN (dB)
1 VCC = 5V 0.5
6
0
5.5
0.5
8.0 10.0 100K
5 1M 10M 100M FREQUENCY : f (Hz)
50 25
0
25
50
75
100
1
50 25
0
25
50
75
100
AMBIENT TEMPERATURE : Ta (°C)
AMBIENT TEMPERATURE : Ta (°C)
Fig. 3 Voltage gain vs. frequency
Fig. 4 Maximum voltage gain vs. ambient temperature
Fig. 5 Voltage gain vs. temperature
5 VCC = 5V Min. VOLTAGE GAIN (dB) 5.5
6
6.5
7
50 25
0
25
50
75
100
AMBIENT TEMPERATURE : Ta (°C)
Fig. 6 Minimum voltage gain vs. temperature
·External dimensions (Units: mm)
BA7655A
9.3 ± 0.3 6.5 ± 0.3 8 5
BA7655AF
5.0 ± 0.2 8 6.2 ± 0.3 4.4 ± 0.2 5
0.51Min.
7.62
3.2 ± 0.2 3.4 ± 0.3
1.5 ± 0.1
1
4
0.3 ± 0.1
0.11
1.27
0.4 ± 0.1
0.3Min. 0.15
2.54
0.5 ± 0.1 0° ~ 15°
DIP8
SOP8
4
0.15 ± 0.1
1
4
Others parts begin by ba
BA-1 BA-2 BA-3 BA-4 BA-5 BA-6 BA-7 BA-8 BA-9 BA-10 BA-11 BA-12 BA-13 BA-14 BA-15 BA-16 BA-17 BA-18
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