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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 recorders and camcorders Video cassette *Features 1) Wide 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 VCC 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 1C over 25C. 2 Reduce by 3.5mW for each increase in Ta of 1C over 25C, when mounted on a 50mm x 50mm. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Limits 4.5 ~ 5.5 Unit V 2 Multimedia ICs BA7655A / BA7655AF *Electrical characteristics (unless otherwise noted , Ta = 25C , 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. *Circuit operation (voltage-controlled amplifier) can be The gain 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. GAIN (dB) 8 6 4 2 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 |
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