AD8372:  41 dB Range, 1 dB Step Size, Programmable Dual VGA

The AD8372 is a dual, digitally controlled, variable gain amplifier that provides precise gain control, high IP3, and low noise figure. The excellent distortion performance and moderate signal ...More

AD8372:  41 dB Range, 1 dB Step Size, Programmable Dual VGA

Product Description

The AD8372 is a dual, digitally controlled, variable gain amplifier that provides precise gain control, high IP3, and low noise figure. The excellent distortion performance and moderate signal bandwidth make the AD8372 a suitable gain control device for a variety of multichannel receiver applications.

For wide input dynamic range applications, the AD8372 provides a broad 41 dB gain range. The gain is programmed through a bidirectional 4-pin serial interface. The serial inter-face consists of a clock, latch, data input, and data output lines for each channel.

The AD8372 provides the ability to set the transconductance of the output stage using a single external resistor. The RXT1 and RXT2 pins provide a band gap derived stable reference voltage of 1.56 V. Typically 2.0 kΩ shunt resistors to ground are used to set the maximum gain to a nominal value of 31 dB. The current setting resistors can be adjusted to manipulate the gain and distortion performance of each channel. This is a flexible feature in applications where it is desirable to trade off distortion performance for lower power consumption.

The AD8372 is powered on by applying the appropriate logic level to the ENB1, ENB2 pins. When powered down, the AD8372 consumes less than 2.6 mA and offers excellent input-to-output isolation. The gain setting is preserved when powered down.

Fabricated on an Analog Devices high frequency BiCMOS process, the AD8372 provides precise gain adjustment capabilities with good distortion performance. The quiescent current of the AD8372 is typically 106 mA per channel. The AD8372 amplifier comes in a compact, thermally enhanced 5 mm × 5 mm 32-lead LFCSP package and operates over the temperature range of −40°C to +85°C.

Applications

  • Differential ADC drivers
  • CMTS upstream direct sampling receivers
  • CATV modem signal scaling
  • Generic RF/IF gain stages
  • Single-ended-to-differential conversion

    • Data Sheet, Rev. 0, 11/07

    Features

    • Dual independent digitally controlled VGA
    • Differential input and output
      150 Ω differential input
      Open-collector differential output
    • 7.8 dB noise figure to 100 MHz @ maximum gain
    • HD2/HD3 better than 77 dBc for 1 V p-p differential output
    • −3 dB bandwidth of 150 MHz
    • 41 dB gain range
    • 1 dB step size ± 0.2 dB
    • Serial 8-bit bidirectional SPI control interface
    • Wide input dynamic range
    • Pin-programmable output stage
    • Power-down feature
    • Single 5 V supply: 106 mA per channel

    Diagrams

    AD8372 Diagram
    Functional Block Diagram for AD8372

    Specifications

    Supply Voltage (V) +5V
    Gain Low End (dB) -9dB
    Gain High End (dB) +32dB
    -3 dB BW (MHz) 130MHz
    Gain Accuracy (dB) ±0.3dB
    Supply Current 116mA
    Package 32-Lead CSP

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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 $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
    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 32mA - 2 8-Lead SOIC/8-Lead uSOIC $2.52
    AD8351 Analog 2200 0 +26 - 2.7 +5 32mA - 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 700 +25 +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 690 -4 +20 1 - +5 130mA ±0.2 19 24-Lead LFCSP $4.54
    AD8376 Digital 690 -4 +20 2 - +5 260mA ±0.2 19 32-Lead CSP $6.57
    ADL5330 Analog 3000 -34 +22 1 - +5 240mA - 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 - - - -0.02 - 40-Lead LFCSP -

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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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.

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