16-Bit, Programmable, Delta-Sigma A/D Converter with 6-Bit Latch

The 16-bit CS5529 is a low-power programmable Delta-Sigma analog-to-digital converter (ADC) which includes coarse/fine charge buffers, a fourth-order Delta-Sigma modulator, a calibration micro-controller, a digital filter with programmable decimation rates, a 6-bit output latch, and a three-wire serial interface. The A/D converter is designed to operate from single or dual analog supplies and a single digital supply.

The digital filter is programmable with output update rates between 1.88 Hz to 101 Hz. These output rates are specified for XIN = 32.768 kHz. Output word rates can be increased by approximately 3X by using XIN = 100 kHz. The filter is designed to settle to full accuracy for the selected output word rate in one conversion. When operated at word rates of 15 Hz or less, the filter rejects both 50 Hz and 60 Hz simultaneously.

Low power, single conversion settling time, programmable output rates, and the ability to handle negative input signals make this single or dual supply product an ideal solution for isolated and non-isolated applications.

• Delta-Sigma analog-to-digital converter
  • Linearity error: 0.0015%FS
  • Noise-free resolution: 16-bits
• 2.5V bipolar/unipolar buffered input range
• 6-bit output latch
• Eight digital filters
  • Selectable output word rates
  • Output settles in one conversion cycle
  • 50/60 Hz ±3 Hz simultaneous rejection
• Simple three-wire serial interface
  • SPI and Microwire compatible
  • Schmitt Trigger on Serial Clock (SCLK)
• System/self-calibration with read/write registers
• Power supply configurations
  • VA+ = 5V; VA- = 0V; VD+ = 3 to 5V
  • VA+ = 2.5V; VA- = -2.5V; VD+ = 3 to 5V
• Low power consumption: 2.5 mW
• Package: 20-pin SSOP, 20-pin PDIP