General Description

The CS5531/32/33/34 are highly integrated ∆Σ Analogto-Digital Converters (ADCs) which use charge-balance techniques to achieve 16-bit (CS5531/33) and 24-bit (CS5532/34) performance. The ADCs are optimized for measuring low-level unipolar or bipolar signals in weigh scale, process control, scientific, and medical applications.

Features

❐ Chopper-stabilized PGIA (Programmable Gain Instrumentation Amplifier, 1x to 64x)

– 12 nV/√Hz @ 0.1 Hz (No 1/f noise) at 64x

– 1200 pA Input Current with Gains >1

❐ Delta-sigma Analog-to-digital Converter

– Linearity Error: 0.0007 FS

– Noise Free Resolution: Up to 23 bits

❐ Two- or Four-channel Differential MUX

❐ Scalable Input Span via Calibration

– ±5 mV to differential ±2.5V

❐ Scalable VREF Input: Up to Analog Supply

❐ Simple Three-wire Serial Interface

– SPI™ and Microwire™ Compatible

– Schmitt Trigger on Serial Clock (SCLK)

❐ R/W Calibration Registers Per Channel

❐ Selectable Word Rates: 6.25 to 3,840 Sps

❐ Selectable 50 or 60 Hz Rejection

❐ Power Supply Configurations

– VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V

– VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V

– VA+ = +3 V; VA- = -3 V; VD+ = +3 V