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 ...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

    Features

    • 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

    Diagrams

    AD8335 Diagram
    Functional Block Diagram for AD8335

    技术指标

    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 (max) 76mA
    Package 64-Lead LFCSP

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    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 ±1 26.5 28-Lead PSOP, 28-Lead TSSOP $3.95
    AD8327 Digital 160 -18 +30 1 64 +5 105mA ±1