www.cirrus.com

CS5560/70/80 Family

High-Throughput Delta-Sigma A/D Converters

The CS556x/7x/8x family of 24- and

16-bit Delta-Sigma analog-to-digital

converters combine the higher-bandwidth,

low-distortion performance of SAR

converters with high-resolution, low-

noise performance typical of Delta-Sigma

ADCs. The breakthrough combination of

features provides designers of precision

instrumentation, such as industrial process

controllers, laboratory instrumentation,

medical instrumentation, and high-speed

weighing systems, with a significantly

higher level of measurement accuracy,

lower noise and higher throughput.

The CS556x provides a much higher

level of noise suppression than SAR

converters, resulting in higher accuracy

conversions and reduced post-conversion

processing. The family features DNL

error as low as ±0.04 LSB typical

(CS5571), compared to ±1 LSB typical

within SAR converters. In addition, the

single-clock latency digital filter allows

conversion-rate switching of the input

with no loss in throughput. The CS556x’s

high-throughput precision performance

stands out among high-resolution Delta-

Sigma converters. With near-flat digital

FIR filter characteristics, the CS556x

product line achieves unrestricted,

wide-bandwidth signal throughput

usually seen only in higher-speed SAR

converters – at resolutions up to 24

bits. With this flat filter, output data is

a 1:1 representation of the input signal

across the entire frequency range, up

to the sampling rate of the converter. In

comparison, most Delta-Sigma converters

utilize Sinc filters, which attenuate

the signal at specific frequencies.

Other additional key features

of the CS556x include:

• High-impedance buffered inputs

that simplify external circuitry;

• Fully differential inputs that provide

the best possible noise rejection and

dynamic accuracy, with the ability

to measure bipolar signals; and

• Self calibration to ensure superior

measurement accuracy over variations

in supply and temperature.

A flexible serial interface eases

connections to a variety of

microcontrollers without external

components (includes slave and

self-sequencing master modes).

CS5560/70/80

CS5560/70/80

24-pin SSOP

2.56 mm x 1.69 mm

actual size

CS5560