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
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