AD8337

通用型，低成本，直流耦合VGA General-Purpose, Low Cost, DC-Coupled VGA

GENERAL DESCRIPTION

The 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