Texas Instruments VCA824
The VCA824 is a DC-coupled, wideband, linear-in V/V, continuously variable, voltage-controlled gain amplifier. The device provides a differential input to single-ended conversion with a high-impedance gain control input used to vary the gain down 40 dB from the nominal maximum gain set by the gain resistor (RG) and feedback resistor (RF). The maximum gain is set externally with two resistors, providing flexibility in designs.| Part No. | VCA824 |
|---|---|
| Datasheet | VCA824 Download |
| Manufacturer |  Texas Instruments |
| Description | Variable Gain Amplifier |
| Buy | Stock & Price |
FEATURES
●1 710-MHz Small-Signal Bandwidth (G = 2 V/V)● 320 MHz, 4-VPP Bandwidth (G = 10 V/V)
● 0.1-dB Gain Flatness to 135 MHz
● 2500-V/µs Slew Rate
● > 40-dB Gain Adjust Range
● High Gain Accuracy: 20-dB ±0.3-dB
● High Output Current: ±90 mA 2
APPLICATIONS
● Differential Line Receivers● Differential Equalizers
● Pulse Amplitude Compensation
● Variable Attenuators
● Voltage-Tunable Active Filters 3
DESCRIPTION
SPACE Differential Equalizer VIN1 VIN2 +VIN RF RS RG+ R1 RG FB VCA824 C1 RG-VIN 20W RS The VCA824 internal architecture consists of two input buffers and an output current feedback amplifier stage integrated with a multiplier core to provide a complete variable gain amplifier (VGA) system that does not require external buffering. The maximum gain is intended to be set between 2 V/V and 40 V/V. Operating from ±5-V supplies, the gain control voltage for the VCA824 adjusts the gain linearly in V/V as the control voltage varies from 1 V to –1 V. For example, set for a maximum gain of 10 V/V, the VCA824 provides 10 V/V, at 1-V input, to 0.1 V/V at –1-V input of gain control range.
