VCA820 Texas instruments

VCA820

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VCA820

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Описание

The VCA820 is a dc-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. The VCA820 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 VCA820 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 set externally with two resistors, providing flexibility in designs. The maximum gain is intended to be set between +2 V/V and +100 V/V. Operating from ±5-V supplies, the gain control voltage for the VCA820 adjusts the gain linearly in dB as the control voltage varies from 0 V to +2 V. For example, set for a maximum gain of +10 V/V, the VCA820 provides 20 dB, at +2-V input, to 20 dB at 0-V input of gain control range. The VCA820 offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between 1 V and 2 V, the gain does not deviate by more than ±0.4dB (maximum at +25°C).

150-MHz Small-Signal Bandwidth
137-MHz, 5-V_PP Bandwidth (G = +10 V/V)
0.1-dB Gain Flatness to 28 MHz
1700-V/µs Slew Rate
> 40-dB Gain Adjust Range
High Gain Accuracy: 20 dB ±0.4dB
High Output Current: 160 mA
APPLICATIONS
- AGC Receivers With RSSI
- Differential Line Receivers
- Pulse Amplitude Compensation
- Variable Attenuators

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PGA/VGA	VGA
Number of channels	1
BW at Acl (MHz)	150
Vs (max) (V)	12
Vs (min) (V)	7
Acl, min spec gain (V/V)	10
Gain (max) (dB)	40
Slew rate (typ) (V/µs)	1700
Operating temperature range (°C)	-40 to 85
Features	Analog Gain Set, Differential to Single-ended conversion
Rating	Catalog