Broadcom ACPL-0873 3-Channel Digital Filters

Broadcom ACPL-0873 3-Channel Digital Filters are designed specifically for second-order sigma-delta modulators in voltage and current sensing. The individual input channels receive an independent Sigma-Delta (Σ-Δ) modulator bit stream, which is processed by three individual digital decimation filters. The digital filters feature four decimation ratios for Sinc2 mode and three decimation ratios for Sinc3 mode, offset calibration, and fast over-range detection.

The ACPL-0873 provides an output for three channels using an over-current signal, which triggers over-voltage/current conditions. The ACPL-0873 uses an SPI-compatible interface that can directly connect to a microcontroller to output 16 bits of digital filter data and write/read filter registers.


  • Direct interface between Isolated Sigma-Delta
  • Modulator and MCU/DSP
  • Three individual digital filters
  • Fast over-range detection
  • Offset calibration
  • Channel 1 MCLK clock detection at power up
  • Programmable input configuration
  • SPI-compatible interface
  • Compact surface-mount QFN-20 5mm × 5mm
  • Operating temperature –40°C to 125°C
  • SPI clock frequency up to 17MHz
  • Modulator clock frequency up to 25MHz


  • Motor phase and rail current sensing
  • Power inverter current and voltage sensing
  • Industrial process control
  • Data acquisition systems
  • General voltage or current sensing
Published: 2018-12-17 | Updated: 2022-07-28