Multi-channel diagnostic-quality ECG acquisition ASIC for AED applications

Multi-channel diagnostic-quality ECG acquisition ASIC for AED applications

The low-power low-noise ASIC includes 3 differential bio-potential channels and one bio-impedance measurement channel to measure body impedance variation due to respiration. Fully configurable digital filtering and processing blocks and lead-off check and pacemaker detection blocks are also embedded in the ASIC, together with right leg driver, shield driver and Wilson common terminal blocks, making it ideal for (battery-operated) ECG systems.

FEATURES

  • 3 differential bio-potential channels (up to 10 kHz)
  • 1 body-impedance measurement channel
  • embedded pacemaker pulse detection
  • fully integrated high-pass filter to remove half-cell DC values (0.6V)
  • 5uV absolute accuracy @ mV input-range
  • low supply voltage: 1.62 V to 3.6 V
  • maximum flexibility due to input connection circuit matrix
  • configurable band-pass filters
  • IQ impedance demodulation
  • DC and AC lead-off detection
  • Right leg driver (RLD), low 1/f-noise Wilson common terminal (WCT) and shield driver (SD)
  • Less than 1 mA/channel at maximum bandwidth and maximum resolution
  • SPI daisy chain to connect 4 ICs in parallel
  • EMI tolerant
  • 6x6mm 40-lead LGA
  • 0.13um CMOS

Chip layout