Electronic Design

Sigma-Delta ADC Line Adds Lower-Cost Version

A lower-cost offering, the CS5530, has been added to Cirrus Logic's CS5531/32/33/34 family of integrated delta-sigma analog-to-digital converters (ADCs). The CS5530 offers the same low-noise performance and output word rate flexibility of the previous devices. With its low-noise instrumentation amplifier, 24-bit performance, and advanced features, the CS5530 is ideal for scientific measurement applications like weigh scales, low-cost temperature controllers, digital panel meters, and process control modules.

A single differential input channel and a fixed gain of 64x in the high-performance chopper-stabilized instrumentation amplifier delivers noise performance of 12 nV per root hertz at 0.01 Hz. Digital scaling is also available, which can provide additional effective gain of up to 40. The delta-sigma modulator is identical to that used throughout the CS553X product family and features both 50-Hz and 60-Hz rejection. The range of user-selectable output word rates is also unchanged, with 20 rates between 6.25 and 3840 samples per second when operating from a 4.9152-MHz master clock. With a simple three-wire SPI and microwire-compatible serial interface, the CS5530 is easily connected to most popular microcontrollers.

Currently sampling to key customers, the CS5530 comes in a 20-lead TSSOP package and is priced at $3.99 in quantities of 1000.

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