ACPL-0873-500E

ACPL-0873-500E is a three-channel digital filter for second order sigma-delta modulators in voltage and current sensing. Each input channel can receive an independent Sigma-Delta (Σ-Δ) modulator bit stream. The bit streams are processed by three individual digital decimation filters. Features of the digital filter include four decimation ratios for Sinc2 mode and three decimation ratios for Sinc3 mode, offset calibration, and fast over-range detection. The ACPL-0873 outputs an over-current signal for three channels, signalling over-voltage/current conditions. Through SPI compatible interface, ACPL-0873 can directly connect to a microcontroller to output 16 bits digital filter data and write/read filter registers. Applications include motor phase and rail current sensing, power inverter current and voltage sensing, industrial process control, data acquisition systems, general voltage or current sensing.

• 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
• SPI clock frequency is 17MHz max at 4.5V ≤ VDD ≤ 5.5V
• Modulator clock frequency is 25MHz maximum
• Supply voltage range from 3 to 5.5V
• Quiescent power supply current is 1µA max (all 3 channels MCLK and MDAT short to GND, no SPI clock)
• Compact surface-mount QFN-20 package
• Operating temperature range from -40°C to 125°C