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AD8335:  QUAD LOW NOISE, LOW COST VARIABLE GAIN AMPLIFIER

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 ...More

AD8335:  QUAD LOW NOISE, LOW COST VARIABLE GAIN AMPLIFIER

Product Description

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

    RESOURCES & TOOLS

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    • 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
    • Supply Voltage (V): +5V
    • Gain Low End (dB): -10dB
    • Gain High End (dB): +38dB
    • -3 dB BW (MHz): 70MHz
    • Spectral Noise (nV/rtHz): 1.3nV/rtHz
    • Gain Accuracy (dB): ±0.2dB
    • Supply Current : 76mA
    • Package: 64-Lead LFCSP

    Functional Block Diagram for AD8335

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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.