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AD8264:  Quad, 235 MHz, DC Coupled VGA and Differential Output Amplifier

The AD8264 is a 4-channel, linear-in-dB, general-purpose variable gain amplifier (VGA) with a preamplifier (preamp), and a flexible differential output buffer. Intended for a broad range of applications, dc coupling combined with wide band-width makes this amplifier a very good pulse processor.

Each channel includes a single-ended input preamp/VGA section to preserve the wide bandwidth and ...More

AD8264:  Quad, 235 MHz, DC Coupled VGA and Differential Output Amplifier

Product Description

The AD8264 is a 4-channel, linear-in-dB, general-purpose variable gain amplifier (VGA) with a preamplifier (preamp), and a flexible differential output buffer. Intended for a broad range of applications, dc coupling combined with wide band-width makes this amplifier a very good pulse processor.

Each channel includes a single-ended input preamp/VGA section to preserve the wide bandwidth and fast slew rate for low-distortion pulse applications. A 6 dB differential output buffer with common-mode and offset adjustments enable direct coupling to most modern high speed analog-to-digital converters (ADCs), using the converter reference output for perfect dc matching levels.

The −3 dB bandwidth of the preamp/VGA is dc to 235 MHz, and the bandwidth of the differential driver is 80 MHz. The floating gain control interface provides a precise linear-in-dB scale of 20 dB/V and is easy to interface to a variety of external circuits.

The gain of each channel is adjusted independently, and all channels are referenced to a single pin, GNLO. Combined with a multi-output, digital-to-analog converter (DAC), each section of the AD8264 can be used for active calibration or as a trim amplifier.

The gain range of the VGA section is 24 dB. Operation from a dual polarity power supply enables amplification of negative voltage pulses that are generated by current-sinking pulses into a grounded load, such as is typical of photodiodes or photo-multiplier tubes (PMT). Delay-free processing of wide-band video signals is also possible. The differential output amplifier permits convenient level shifting and interfacing to single-supply ADCs using the VOCM and OFSx pins.

The AD8264 is available in a 40-lead, 6 mm × 6 mm LFCSP with an operating temperature range of −40°C to +105°C.

Applications

  • Multi-Channel Data Acquisition
  • Positron Emission Tomography
  • Gain Trim
  • Industrial and Medical Ultrasound
  • Radar Receivers

RESOURCES & TOOLS

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  • Low Noise
    Voltage noise = 2.3 nV/√Hz
    Current noise = 2 pA/√Hz
  • Wide Bandwidth
    Small Signal: 235 MHz (VGAx); 80 MHz (Diff. Amp Out)
    Large Signal: 80 MHz (1Vp-p)
  • Gain Range:
    0 to 24 dB (input to VGA output)
    6 to 30 dB (input to differential output)
  • Gain Scaling: 20 dB/V
  • DC-Coupled
  • Single - ended input and differential output
  • Supplies: ±2.5V to ±5V
  • Low power: 140 mW per channel @ ±3.3V
  • Supply Voltage (V): ±5V
  • Gain Low End (dB): 0
  • Gain High End (dB): +24dB
  • -3 dB BW (MHz): 235MHz
  • Spectral Noise (nV/rtHz): 2.3nV/rtHz
  • Gain Accuracy (dB): +2dB
  • Supply Current : 99mA
  • Package: 40-Lead LFCSP

Functional Block Diagram for AD8264

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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 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 $5.47
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
AD8264 Analog 235 0 +24 4 2.3 ±5 99mA +2 - 40-Lead LFCSP $11.95
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 18 20-Lead TSSOP $3.80
AD8328 Digital 107 -27.5 +31.5 1 135 - 120mA ±1 18.4 20-Lead LFCSP, 20-Lead QSOP $1.92
AD8330 Analog 150 0 +50 1 5 +6 20mA ±0.5 - 16-Lead LFCSP, 16-Lead QSOP $4.44
AD8331 Analog 120 -4.5 +43 1 0.74 +5 25mA +0.5 7 - $5.45
AD8332 Analog 120 -4.5 +43.5 2 0.74 +5 58mA +0.5 7 28-Lead TSSOP, 32-Lead CSP $10.57
AD8334 Analog 100 +4.5 +43.5 4 0.74 +5 116mA +0.5 7 64-Lead LFCSP $14.66
AD8335 Analog 70 -10 +38 4 1.3 +5 76mA ±0.2 18 64-Lead LFCSP $12.14
AD8336 Analog 115 -14 +46 1 3 ±12 25mA ±0.5 11 16-Lead LFCSP $4.59
AD8337 Analog 280 0 +24 1 2.2 ±5 15mA ±0.25 - 8-Lead LFCSP $2.49
AD8350 Analog 900 +15 +20 - 1.7 +11 28mA - 2 8-Lead SOIC/8-Lead uSOIC $2.52
AD8351 Analog 2200 0 +26 - 2.7 +5 28mA - 13 10-Lead uSOIC $2.68
AD8352 Analog 2200 +3 +25 - 2.6 +5.5 37mA - 13 16-Lead LFCSP $3.53
AD8366 Digital 1000 +4.5 +20.5 - - - 180mA - - 32-Lead CSP -
AD8367 Analog 500 -2.5 +42.5 1 1.84 +5.5 26mA ±0.2 8.1 14-Lead TSSOP $4.60
AD8368 Analog 800 -12 +22 1 - +5 - ±0.4 13 24-Lead LFCSP $4.60
AD8369 Digital 600 -5 +40 1 2 +5.5 37mA ±0.5 0.5 16-Lead TSSOP $4.25
AD8370 Digital 750 -11 +34 1 2.1 +5.5 78mA - 14 16-Lead TSSOP $4.25
AD8372 Digital 130 -9 +32 2 - +5 116mA ±0.3 - 32-Lead CSP $6.58
AD8375 Digital 630 -4 +20 1 - +5 125mA ±0.2 19 24-Lead LFCSP $4.54
AD8376 Digital 700 -4 +20 2 - +5 250mA ±0.2 19 32-Lead CSP $6.57
ADL5330 Analog 3000 -34 +22 1 - +5 215mA - 1.2 24-Lead LFCSP $5.04
ADL5331 Analog 1500 -14 +17 1 - - 240mA - - - -
ADL5390 Analog 2400 - +7 1 - +5 130mA - 9.6 24-Lead LFCSP $7.59
ADL5391 Analog 2000 - +9.5 1 26.7 +5 135mA - 15.1 16-Lead LFCSP $4.95
ADL5561 - 2900 +6 +15.5 - 2.1 - 40mA - - 16-Lead LFCSP $3.68
ADL5592 Digital 2400 - +30.5 1 - - 189mA -0.02 - 40-Lead LFCSP -
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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.