VCA821 Wideband, > 40dB Adjust Range, Linear in dB Variable Gain Amplifier | TI.com

VCA821 (ACTIVE)

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

 

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 (RG) and feedback resistor (RF).

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 VG = +2 V, to less than –20 dB at VG = 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).

Features

  • 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

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Parametrics Compare all products in Programmable & variable gain amplifiers (PGA/VGA)

 
PGA/VGA
Number of channels (#)
Vs (Min) (V)
Vs (Max) (V)
BW @ Acl (MHz)
Acl, min spec gain (V/V)
Gain (Max) (dB)
Slew Rate (Typ) (V/us)
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
VCA821 VCA820 VCA822 VCA824
VGA     VGA     VGA     VGA    
1     1     1     1    
7     7     7     8    
12     12     12     12    
710     150     150     710    
2     10     10     2    
40     40     40     40    
2500     1700     1700     2500    
-40 to 85     -40 to 85     -40 to 85     -40 to 85    
SOIC | 14
VSSOP | 10    
SOIC | 14
VSSOP | 10    
SOIC | 14
VSSOP | 10    
SOIC | 14
VSSOP | 10    
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)
10VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 10)    
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)
10VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 10)    
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)
10VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 10)    
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)
10VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 10)