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See Technical Specifications

VCA821ID

Wideband, > 40dB Adjust Range, Linear in dB Variable Gain Amplifier

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

VCA821ID
Datasheet:

VCA821ID Datasheet (PDF)
Amplifier Type:

Variable Gain
Number of Circuits:

1
Slew Rate:

2500V/µs
-3db Bandwidth:

710 MHz
EDA/CAD Models:

Request Free CAD Models for VCA821ID

Email: [email protected]

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VCA821ID General Description

The VCA821 device is a DC-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. It 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 (R_G) and feedback resistor (R_F).

The VCA821 device 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 6 dB and 32 dB. Operating from ±5-V supplies, the gain control voltage for the VCA821 device adjusts the gain linearly in dB as the control voltage varies from 0V to +2 V. For example, set at a maximum gain of 20 dB, the VCA821 device provides 20 dB, at V_G = +2 V, to less than –20 dB at V_G = 0 V. The VCA821 device 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 ±0.3 dB (maximum at +25°C).

Key Features

710-MHz Small-Signal Bandwidth
(G = +2 V/V)
320 MHz, 4 V_PP 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

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersInstrumentation, OP Amps, Buffer Amps	Series	-
Amplifier Type	Variable Gain	Number of Circuits	1
Output Type	-	Slew Rate	2500V/µs
-3db Bandwidth	710 MHz	Current - Input Bias	19 µA
Voltage - Input Offset	4 mV	Current - Supply	34mA
Current - Output / Channel	90 mA	Voltage - Supply Span (Min)	7 V
Voltage - Supply Span (Max)	12 V	Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount	Base Product Number	VCA821