GENERAL DESCRIPTION

The AD8337 is a low noise, single-ended, linear-in-dB, general purpose variable gain amplifier (VGA) usable at frequencies from dc to 100 MHz; the −3 dB bandwidth is 280 MHz. Excellent bandwidth uniformity across the entire gain range and low output-referred noise makes the AD8337 ideal for gain trim applications and for driving high speed analog-to digital converters (ADCs).

FEATURES

Low noise

  Voltage noise = 2.2 nV/√Hz

  Current noise = 4.8 pA/√Hz (positive input)

Wide bandwidth (−3 dB) = 280 MHz

Nominal gain range: 0 dB to 24 dB (preamp gain = 6 dB)

Gain scaling: 19.7 dB/V

DC-coupled

Single-ended input and output

High speed uncommitted op amp input

Supplies: +5 V, ±2.5 V, or ±5 V

Low power: 78 mW with ±2.5 V supplies

APPLICATIONS

Gain trim

PET scanners

High performance AGC systems

I/Q signal processing

Video

Industrial and medical ultrasound

Radar receivers