AD8270:  Precision Dual-Channel, Difference Amplifier

The AD8270 is a low distortion, dual-channel amplifier with internal gain setting resistors. With no external components, it can be configured as a high performance difference amplifier with gains of ...More

AD8270:  Precision Dual-Channel, Difference Amplifier

Product Description

The AD8270 is a low distortion, dual-channel amplifier with internal gain setting resistors. With no external components, it can be configured as a high performance difference amplifier with gains of 0.5, 1, or 2. It can also be configured in over 40 single-ended configurations, with gains ranging from −2 to +3.

The AD8270 is the first dual-difference amplifier in the small 4 mm × 4 mm LFCSP. It requires the same board area as a typical single-difference amplifier. The smaller package allows a 2× increase in channel density and a lower cost per channel, all with no compromise in performance.

The AD8270 operates on both single and dual supplies and requires only 2.5 mA maximum supply current for each amplifier. It is specified over the industrial temperature range of −40°C to +85°C and is fully RoHS compliant.

Applications

  • Instrumentation amplifier building blocks
  • Level translators
  • Automatic test equipment
  • High performance audio
  • Sine/Cosine encoders

    • Data Sheet, Rev. 0, 1/08

    Features

    • With no external resistors
      Difference amplifier: gains of 0.5, 1, or 2
      Single ended amplifiers: over 40 different gains
      Set reference voltage at midsupply
    • Excellent ac specifications
      15 MHz bandwidth
      30 V/μs slew rate
    • High accuracy dc performance
      0.08% maximum gain error
      10 ppm/°C maximum gain drift
      80 dB minimum CMRR (G = 2)
    • Two channels in small 4 mm × 4 mm LFCSP
    • Supply current: 2.5 mA per channel
    • Supply range: ±2.5 V to ±18 V

    Diagrams

    AD8270 Diagram
    Functional Block Diagram for AD8270

    Specifications

    Single/Dual Supply Dual
    Voltage Supply (Vmax) +36V
    Gain Setting Method Pin
    Gain Range (min to max) 1.5
    Bandwidth G=10 (kHz typ) 10000kHz
    CMRR (dB) 98dB
    Vnoise RTI 1-10 Hz µVp-p 1µV p-p
    Temperature Range -40 to +125
    Supply Current (max) 2.5mA

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    Part# Description Single/Dual Supply Vcc-Vee Gain Setting Method Bandwidth G=10 (kHz typ) Gain min. Gain max. Min CMRR @ 60 Hz Min Gain Min CMRR @ 60Hz Max Gain Vnoise RTI 1-10 Hz µVp-p Price* (1000-4999)
    AD522 Diff Amp Dual 10V to 36V Resistor 3 1 1,000 75dB 100dB 4 -
    AD524 Precision IA Dual 12V to 36V Pin 400 1 1,000 70dB 110dB 0.3 $9.52
    AD526 Software Programmable Dual 9V to 33V Software 350 1 16 - - 3 $6.39
    AD620 General Purpose IA Dual 4.6V to 36V Resistor 800 1 10,000 73dB 110dB 0.28 $3.18
    AD621 Precision IA Dual 4.6V to 18V Pin 800 10 100 93dB 110dB 0.28 $4.09
    AD622 Low Cost IA Dual 5.2V to 36V Resistor 800 1 1,000 66dB 103dB 0.3 $2.51
    AD623 S.S R-R IA Single/Dual 2.7V to 12V Resistor 100 1 1,000 70dB 105dB 2 $1.40
    AD624 Precision IA Dual 12V to 36V Pin 400 1 1,000 70dB 110dB 0.3 $11.93
    AD625 Programmable Gain IA Dual 12V to 36V Resistor 400 1 10,000 70dB 110dB 0.3 $8.78
    AD626 Diff Amp Single/Dual 2.4V to 12V Pin 100 10 100 55dB 55dB 2 $3.70
    AD627 Micropower IA Single/Dual 2.2V to 36V Resistor 30 5 1,000 77dB 77dB 1.2 $2.56
    AD628 High CMV DA Single/Dual 4.5V to 36V Pin, Resistor 600 0.1 100 75dB 75dB 15 $1.78
    AD629 High CMV DA Dual