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  2. Amplifiers
  3. Variable Gain Amplifiers (VGA)
  4. Analog Control Variable Gain Amplifiers (VGAs)
  5. AD8335


Features and Benefits

  • 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

Product Details

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.


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

    Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD8335ACPZ Material Declaration Reliability Data 64-Lead LFCSP (9mm x 9mm w/ EP)
    AD8335ACPZ-REEL Material Declaration Reliability Data 64-Lead LFCSP (9mm x 9mm w/ EP)
    AD8335ACPZ-REEL7 Material Declaration Reliability Data 64-Lead LFCSP (9mm x 9mm w/ EP)
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