AD8335

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Quad Low Noise, Low Cost Variable Gain Amplifier

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Overview

  • Low noise preamplifier (PrA)
  • Voltage noise = 1.3 nV/√Hz typical
  • Current noise = 2.4 pA/√Hz typical
  • NF = 7 dB (RS = RIN = 50 Ω)
  • Single-ended input; VIN maximum = 625 mV p-p
  • Active input match
  • Input SNR (noise bandwidth = 20 MHz) = 92 dB
  • VGA
    Differential output
    VOUT maximum = 5 V p-p, RL = 500 Ω differential
    Gain range (8 dB output gain step)
    −10 dB to +38 dB—low gain mode
    −2 dB to +46 dB—high gain mode
    Accurate linear-in-dB gain control
  • For additional features please see data sheet

The AD8335 is a quad variable gain amplifier (VGA) with low noise preamplifier intended for cost and power sensitive applications. Each channel features a gain range of 48 dB, fully differential signal paths, active input preamplifier matching, and user-selectable maximum gains of 46 dB and 38 dB. Individual gain controls are provided for each channel.

The preamplifier (PrA) has a single-ended to differential gain of ×8 (18.06 dB) and accepts input signals <625 mV p-p. PrA noise is 1.2 nV/√Hz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/√Hz at maximum gain.

Assuming a 20 MHz noise bandwidth (NBW), the Nyquist frequency for a 40 MHz ADC, the input SNR is 92 dB. The HLxx pin optimizes the output SNR for 10-bit and 12-bit ADCs with 1 V p-p or 2 V p-p full-scale (FS) inputs.

Channel 1 and Channel 2 are enabled through the EN12 pin and Channel 3 and Channel 4 are enabled through the EN34 pin. For VGA only applications, the PrAs can be powered down, significantly reducing power consumption.

The AD8335 is available in a 64-lead lead frame chip scale package (9 mm × 9 mm) for the industrial temperature range of −40°C to +85°C.

Applications

  • Medical imaging (ultrasound, gamma cameras)
  • Sonar
  • Test and measurement
  • Precise, stable wideband gain control
  • Data Sheet, Rev A, 08/2008

    AD8335
    Quad Low Noise, Low Cost Variable Gain Amplifier
    AD8335-fbL
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    Evaluation Kits

    EVAL-AD8335

    AD8335 Evaluation Board

    Product Details

    Jumpers provide for exercising the user-selectable features of the AD8335, such as the preamp and VGAs and the optional high and low gain ranges. Test pins are provided for power and gain voltage connections and for probes used to observe waveforms at the input and outputs. Provisions are also made for driving the gain controls dynamically.


    See the AD8335 data sheet for measurement setup, board layout and further details.

    EVAL-AD8335
    AD8335 Evaluation Board

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