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AS89020 Converter with digital output

4-channel, current input 12-bit Analog-to-Digital Converter (ADC)


  • 4 channel, current input analog-to-digital converter (ADC)
  • 12-bit digital output
  • Each channel is addressable and programmable in 17 levels
  • Measurement of positive and negative currents
  • Temperature compensation on chip
  • Fast SPI serial digital output


  • Conversion of 4 sensor signals of photodiodes or other sensors with current signal output
  • Each channel separately programmable in 17 stages
  • Parallel sampling + MUX + SPI output
  • High amplification linearity, no cross talk
  • High absolute accuracy without additional sources
  • Supply and temperature independet performance
  • Low power consumption

Product parameters

Interface Fast SPI up to 16MHz
Programmable Transimpedance in 17 stages 20kOhm - 102MOhm
Sensitivity up to 2.8 pA/LSB
Input Current 12nA - 12µA
Signal Frequencies [kHz] 3 to 340
Supply Voltage [V] 2.7 to 3.6
Package SSOP20
Size [mm] 8.56 x 5.84 x 1.62
Temperature Range [°C] -25 to 85
Size [mm]

General description

The AS89020 is a 12-bit, 4-channel, current input Analog-to-Digital Converter (ADC). It combines current-to-voltage (TIA) and analog-to-digital (AD) conversion, so that 4 separate current output devices (e.g. photodiodes) can be directly connected to its inputs and digitized.
For each of the 4 inputs the AS89020 provides an input amplifier with a track and hold circuit. The outputs of the track and hold stages are serial converted to 12-bit digital words using an analog-to-digital converter (ADC).

Not Recommended for New Designs
ams-OSRAM AG is discontinuing production of this device. Final lifetime buy order must be placed by June 30, 2021. Please contact your local sales representative for further information.

This product suits for the following applications:

  • Industrial automation
  • Process control
  • Color matching
  • Print control

Technical documents

Type Description Language
Datasheet Document version 3V01 English


Type Description Language
EoL Notification AS1xxx, AS25xx, AS3xxx, AS73211, AS89020, SL900A, TMD4704 (issued 2020-Dec) English
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