AD8331:  Single VGA with Ultralow Noise Preamplifier and Programmable RIN

The AD8331 is a single, ultralow noise, linear-in-dB, variable gain amplifier (VGA). Optimized for ultrasound systems, it is usable as a low noise variable gain element at frequencies up to 120 ...More

AD8331:  Single VGA with Ultralow Noise Preamplifier and Programmable RIN

Product Description

The AD8331 is a single, ultralow noise, linear-in-dB, variable gain amplifier (VGA). Optimized for ultrasound systems, it is usable as a low noise variable gain element at frequencies up to 120 MHz.

Included is an ultralow noise preamplifier (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamplifier with adjustable output limiting. The LNA gain is 19 dB with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a signal source without compromising noise performance.

The operating temperature range is -40°C to +85°C. The AD8331 is available in a 20-lead QSOP package.

The AD8331 is a single version of the dual AD8332 and quad AD8334.

For information on specs, please see the AD8331/AD8332 datasheet.

Features

  • Ultralow noise preamplifier:
    Voltage noise = 0.74 nV/√Hz
    Current noise = 2.5 pA/√Hz
  • 3 dB bandwidth: 120 MHz
  • Low power: 125 mW/channel
  • Wide gain range with programmable postamp
    -4.5 dB to +43.5 dB
    +7.5 dB to +55.5 dB
  • Low output-referred noise:
    48 nV/√Hz typical
  • Active input impedance matching
  • Optimized for 10-bit/12-bit ADCs
  • Selectable output clamping level
  • Single 5 V supply operation
  • Available in a 20-lead QSOP package

Diagrams

AD8331 Diagram
Functional Block Diagram for AD8331

技术指标

Supply Voltage (V) +5V
Gain Low End (dB) -4.5dB
Gain High End (dB) +43dB
-3 dB BW (MHz) 120MHz
Spectral Noise (nV/rtHz) 0.74nV/rtHz
Gain Accuracy (dB) +0.5dB
Supply Current (max) 25mA

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订阅新产品资料
Part# Gain Control -3 dB BW (MHz) Gain Low End (dB) Gain High End (dB) Number of Channels Spectral Noise (nV/rtHz) Supply Voltage (V) Supply Current (max) Gain Accuracy (dB) 1 dB Comp Point (dBm) Package Price* (1000-4999)
AD600 Analog 35 0 +40 2 1.4 ±5 14mA - - - $16.61
AD602 Analog 35 -10 +30 2 1.4 ±5 14mA - - - $13.36
AD603 Analog 90 -11 +31 1 1.4 ±5 20mA ±0.5 - 8-Lead DIP, 8-Lead SOIC $4.40
AD604 Analog 40 0 +48 2 0.8 ±5 31mA ±0.3 15 24-Lead SOIC, 24-Lead SSOP $16.45
AD605 Analog 40 -14 +34 2 1.8 +5 23mA ±0.2 15 16-Lead SOIC $9.91
AD8260 Digital 180 -6 +24 1 2.4 +3.3 28mA +0.25 - - $3.84
AD8320 Digital 150 -10 +26 1 53 +12 105mA ±0.2 22.5 20-Lead SOIC -
AD8321 Digital 120 -27.4 +26 1 20 +9 90mA ±1 19.5 20-Lead SOIC $4.40
AD8322 Digital 180 -12.6 +29.5 1 64 +5 113mA ±2 19 28-Lead TSSOP $3.19
AD8323 Digital 100 -26 +27.5 1 - +5 - - - 28-Lead TSSOP $3.34
AD8324 Digital 100 -25.5 +33.5 1 157 +3.3 207mA ±1 21 20-Lead LFCSP, 20-Lead QSOP $1.73
AD8325 Digital 100 -29.5 +30 1 56 +5 133mA ±1 18.5 28-Lead TSSOP $3.34
AD8326 Digital 100 -26 +27.5 1 100 ±5 157mA