ZHCSK14E November 2007 – July 2019 VCA824
PRODUCTION DATA.
The VCA824 is a voltage controlled variable gain amplifier with differential inputs and a single ended output. The maximum gain is set by external resistors while the gain range is controlled by an external analog voltage. The maximum gain is designed for gains of 2 V/V up to 100 V/V and the analog control allows a gain range of over 40 dB. The VCA824 Input consists of two buffers, which together create a fully symmetrical, high impedance differential input with a typical common mode rejection of 80 dB. The gain set resistor is connected between the two input buffer output pins, so that the input impedance is independent of the gain settings. The bipolar inputs have a input voltage range of 1.6 and –2.1 V on ±5 V supplies. The amplifier maximum gain is set by external resistors, but the internal gain control circuit is controlled by a continuously variable, analog voltage. The gain control is a multiplier stage which is linear in V/V. The gain control input pin operates over a voltage range of –1 V to 1 V. The VCA824 contains a high-speed, high-current output buffer. The output stage can typically swing ±3.9 V and source/sink ±90 mA. The VCA824 can be operated over a voltage range of ±3.5 V to ±6 V.