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Quad Channel Ultralow Noise Variable Gain Pre-amplifier

Model: AD8334

  • Ultralow noise preamplifier
  • Low power
  • Wide gain range with programmable postamp
  • Low output-referred noise
  • Active input impedance matching
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The AD8334 is an ultralow noise, quad channel linear-in-dB variable gain pre-amplifier. Although optimized for ultrasound systems, it may be used as a low noise variable gain control in any application whose operating frequency is less than 100 MHz.

Included in each channel are an ultralow noise preamp (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamp 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 48 dB gain range of the VGA makes these devices suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface provides precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V. Factory trim ensures excellent part-to-part and channel-to-channel gain matching. Differential signal paths result in superb second- and third-order distortion performance and low crosstalk.

  • Ultralow noise preamplifier
  • Low power
  • Wide gain range with programmable postamp
  • Low output-referred noise
  • Active input impedance matching
  • Optimized for 10-bit/12-bit ADCs
  • Selectable output clamping level
  • Single 5V supply operation
  • Available in lead frame chip scale package
  • Applications:
    • Ultrasound and sonar time-gain controls
    • High performance automatic gain control (AGC) systems
    • I/Q signal processing
    • High speed, dual ADC drivers
 
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