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| Audio ICs Electronic volume for VCRs and audio devices BA7735FS The BA7735FS is an electronic volume IC developed for VCRs and audio devices. FApplications VCRs FFeatures 1) Internal high-performance electronic volume with a dynamic range of 100dB (Typ.). 2) Internal switching between EVR ON and EVR OFF modes. FAbsolute maximum ratings (Ta = 25_C) 3) Gain of output amplifier can be set to any value between 0 and 12dB using an external resistor. 4) 2 power supply supported. 865 Audio ICs FBlock diagram BA7735FS 866 Audio ICs FPin descriptions BA7735FS FInput / output circuit 867 Audio ICs FElectrical characteristics (unless otherwise noted, VCC = )5.0V, VEE = -5.0V, Ta = 25_C) BA7735FS 868 Audio ICs FMeasurement circuit BA7735FS FControl pin description EVR ON / OFF This selects the EVR ON or EVR OFF mode. 869 Audio ICs FCircuit operation EVR control characteristic Gain control is carried out by means of voltage divider between the GND and the EVR REF pin (pin 2). BA7735FS FOperation notes (1) Since muting measures are not taken in the IC when the power supply is turned on or off, these measures should be taken externally if necessary. (2) The gain for the output amplifier should be set to a value between 0 and 12dB. (3) DC offset voltage may be produced, depending on the EVR control point. If this is a problem, insert a coupling capacitor at the point where connection is made to the next stage. (4) If DC offset voltage is a problem when switching modes, countermeasures such as providing a time constant to the control pin (pin 8) can be taken. FExternal dimensions (Units: mm) 870 |
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