ISO122 Precision Isolation Amplifier |

ISO122 (ACTIVE) Precision Isolation Amplifier


Recommended alternative parts

  • ISO124  -  0.01% Gain error non-linearity compared to 0.02%
  • ISO721  -  Digital isolation amplifier instead of analog.

Learn about our next generation ±12V reinforced isolated amplifier ISO224.


The ISO122 is a precision isolation amplifier incorporating a novel duty cycle modulation-demodulation technique. The signal is transmitted digitally across a 2-pF differential capacitive barrier. With digital modulation the barrier characteristics do not affect signal integrity, thus resulting in excellent reliability and good high-frequency transient immunity across the barrier. Both barrier capacitors are imbedded in the plastic body of the package.

The ISO122 is easy to use. No external components are required for operation. The key specifications are 0.020% maximum nonlinearity, 50-kHz signal bandwidth, and 200-V/°C VOS drift. A power supply range of 4.5 V to 18 V and quiescent currents of 5 mA on VS1 and ±5.5 mA on VS2 make the ISO122 ideal for a wide range of applications.

The ISO122 is available in 16-pin plastic DIP and 28-lead plastic surface-mount packages.


  • 100% Tested for High-Voltage Breakdown
  • Rated 1500 Vrms
  • High IMR: 140 dB at 60 Hz
  • Bipolar Operation: VO = ±10 V
  • 16-Pin Plastic DIP and 28-Lead SOIC
  • Ease of Use: Fixed Unity Gain Configuration
  • 0.020% Maximum Nonlinearity
  • ±4.5-V to ±18-V Supply Range


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Part number Order Input range (Vp-p) Isolation working voltage VIOWM (rms) (V) Input offset (+/-) (Max) (mV) Input offset drift (+/-) (Typ) (uV/C) Gain error (+/-) (Max) (%) Gain error drift (+/-) (Typ) (ppm/°C) Gain non-linearity (+/-) (Max) (%) Small signal bandwidth (Typ) (kHz) Rating Operating temperature range (C) Leakage current at 240 V/60 Hz (Max) (uArms)
ISO122 Order now ±10     1500     50     200     0.5     10     0.02     50     Catalog     -25 to 85     0.5    
ISO124 Samples not available ±10     1500     50     200     0.5     10     0.01     50     Catalog     -25 to 85     0.5