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AD8224:  Precision, Dual-Channel, JFET Input, Rail-to-Rail Instrumentation Amplifier

The AD8224 is the first single-supply, JFET input instrumentation amplifier available in the space-saving 16-lead, 4 mm × 4 mm LFCSP. It requires the same board area as a typical single instrumentation amplifier yet doubles the channel density and offers a lower cost per channel without compromising performance.

Designed to meet the needs of high performance, portable instrumentation, the ...More

AD8224:  Precision, Dual-Channel, JFET Input, Rail-to-Rail Instrumentation Amplifier

Product Description

The AD8224 is the first single-supply, JFET input instrumentation amplifier available in the space-saving 16-lead, 4 mm × 4 mm LFCSP. It requires the same board area as a typical single instrumentation amplifier yet doubles the channel density and offers a lower cost per channel without compromising performance.

Designed to meet the needs of high performance, portable instrumentation, the AD8224 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 10 kHz for G = 1. Maximum input bias current is 10 pA and typically remains below 300 pA over the entire industrial temperature range. Despite the JFET inputs, the AD8224 typically has a noise corner of only 10 Hz.

With the proliferation of mixed-signal processing, the number of power supplies required in each system has grown.

Designed to alleviate this problem, the AD8224 can operate on a ±18 V dual supply, as well as on a single +5 V supply. The device’s rail-to-rail output stage maximizes dynamic range on the low voltage supplies common in portable applications. Its ability to run on a single 5 V supply eliminates the need for higher voltage, dual supplies. The AD8224 draws 750 μA of quiescent current per amplifier, making it ideal for battery powered devices.

In addition, the AD8224 can be configured as a single-channel, differential output, instrumentation amplifier. Differential outputs provide high noise immunity, which can be useful when the output signal must travel through a noisy environment, such as with remote sensors. The configuration can also be used to drive differential input ADCs.

For a single-channel version, use the AD8220.

Applications

  • Medical instrumentation
  • Precision data acquisition
  • Transducer interfaces
  • Differential drives for high resolution input ADCs
  • Remote sensors

    • Data Sheet, Rev. A, 4/07

    RESOURCES & TOOLS

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    • Two channels in a small 4 mm × 4 mm LFCSP
    • High CMRR
      100 dB CMRR (minimum), G = 10 (B Grade)
      90 dB CMRR (minimum) to 10 kHz, G = 10 (B Grade)
    • Excellent ac specifications and low power
      1.5 MHz bandwidth (G = 1)
      14 nV/√Hz input noise (1 kHz)
      Slew rate: 2 V/μs
      750 μA quiescent current per amplifier
    • Low input currents
    • 10 pA maximum input bias current (B Grade)
    • 0.6 pA maximum input offset current (B Grade)
    • Versatility
      Rail-to-rail output
      Input voltage range to below negative supply rail
      4 kV ESD protection
      4.5 V to 36 V single supply
      ±2.25 V to ±18 V dual supply
      Gain set with single resistor (G = 1 to 1000)
    • Single/Dual Supply: Single/Dual
    • Gain Setting Method: Resistor
    • Bandwidth G=10 (kHz typ): 800kHz
    • Vnoise RTI 1-10 Hz µVp-p : 0.8µV p-p
    • Temperature Range: -40 to +85
    • Supply Current : 0.8mA
    • Package: LFCSP

    Functional Block Diagram for AD8224

    OF NOTE

    Technical Articles:

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    AD620 General Purpose IA Dual 4.6V to 36V Resistor 800 1 10,000 73dB 110dB 0.28 $3.31
    AD621 Precision IA Dual 4.6V to 36V 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 150 1 1,000 70dB 110dB 0.3 $15.87
    AD625 Programmable Gain IA Dual 12V to 36V Resistor 400 1 10,000 70dB 110dB 0.3 $8.78
    AD626 Diff Amp Single/Dual 4.8V 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 0.56 $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 5V to 36V fixed 500 1 1 77dB 77dB 15 $2.84
    AD8129 Low Cost Diff Amp Single/Dual 4.5V to 25V Resistor 200000 10 - 94dB - - $1.57
    AD8202 High CMV DA Single 3.5V to 12V fixed 50 - - 82dB 82dB 10 $1.51
    AD8203 High CMV DA Single 3.5V to 12V fixed 60 - - 82dB 82dB 10 $1.37
    AD8205 S.S Diff Amp Single 4.5V to 5.5V fixed 50 - - 78dB 78dB 20 $1.51
    AD8206 S.S Diff Amp Single 4.5V to 5.5V fixed 100 - - 76dB 76dB 20 $1.37
    AD8210 Bi-Directional Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $1.81
    AD8211 High CMV Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $0.81
    AD8212 High CMV Shunt Mon Single 7V to 65V Resistor 1000 1 1,000 100dB 100dB 1.1 $0.93
    AD8213 Dual High CMV Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $2.01
    AD8214 High CMV Threshold Detec Single 5V to 65V Resistor - 1 100 80dB 80dB 2.2 $0.76
    AD8215 High CMV Shunt Mon Single 4.5V to 5.5V fixed 450 20 20 100dB 100dB 7 $1.21
    AD8216 High BW 65 V Diff Amp Single 4.5V to 5.5V fixed 3000 3 3 80dB 80dB 20 $1.62
    AD8220 R-R JFET IA Single/Dual 4.6V to 36V Resistor 800 1 1,000 78dB 94dB 0.8 $2.32
    AD8221 High Performance IA Dual 4.6V to 36V Resistor 562 1 1,000 80dB 130dB 0.25 $2.01
    AD8222 Dual High Performance IA Dual - to - Resistor 750 1 1,000 80dB 130dB 0.25 $3.63
    AD8223 S.S R-R IA Single/Dual 3V to 24V Pin 125 5 1,000 80dB 90dB 0.6 $1.05
    AD8224 Dual JFET R-R IA Single/Dual 4.6V to 36V Resistor 800 1 1,000 78dB 94dB 0.8 $4.17
    AD8225 Fixed G=5 IA Dual 3.4V to 36V fixed 900 - - 86dB 86dB 1.5 $3.29
    AD8226 Wide Supply R-R out IA Single/Dual 2.2V to 36V Resistor 200 5 1,000 80dB 105dB 2 $1.40
    AD8227 Wide Supply R-R out IA Single/Dual 2.2V to 36V Resistor 200 5 1,000 90dB 105dB 0.5 $1.38
    AD8228 Precision IA Dual 4.6V to 36V Pin 650 10 100 100dB 120dB 0.5 $3.03
    AD8230 Zero Drift IA Single/Dual 8V to 16V Resistor 2 2 1,000 - 110dB 3 $2.99
    AD8231 Zero Drift Software Prog Single 3V to 6V Digital, Pin, Software 700 1 128 80dB 110dB 0.7 $1.71
    AD8236 - Single 1.8V to 5.5V Resistor 9 - - 94dB 110dB 4 $0.99
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    AD8251 Software Programmable Dual 10V to 34V Digital, Pin 2500 1 8 80dB 98dB 1.2 $5.01
    AD8253 Software Programmable Dual 10V to 34V Digital, Pin 4000 1 1,000 80dB 100dB 1 $4.95
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