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

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).

This product suits for the following applications:

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

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