CS5530-IS datasheet(1/36 Pages) CIRRUS

Part #	CS5530-IS

Description	24-bit ADC with Ultra-low-noise Amplifier

PDF	36 Pages

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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Copyright

 Cirrus Logic, Inc. 2009

http://www.cirrus.com

CS5530

24-bit ADC with Ultra-low-noise Amplifier

Features & Description

 Chopper-stabilized Instrumentation

Amplifier, 64X

• 12 nV/

√Hz @ 0.1 Hz (No 1/f noise)

• 1200 pA Input Current

 Digital Gain Scaling up to 40x

 Delta-sigma Analog-to-digital Converter

• Linearity Error: 0.0015% FS

• Noise Free Resolution: Up to 19 bits

 Scalable VREF Input: Up to Analog Supply

 Simple Three-wire Serial Interface

• SPI™ and Microwire™ Compatible

• Schmitt-trigger on Serial Clock (SCLK)

 Onboard Offset and Gain Calibration

Registers

 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

General Description

The CS5530 is a highly integrated

ΔΣ Analog-to-Digital

Converter (ADC) which uses charge-balance techniques

to achieve 24-bit performance. The ADC is optimized for

measuring low-level unipolar or bipolar signals in weigh

scale,

process

control,

scientific,

and

medical

applications.

To accommodate these applications, the ADC includes

a very-low-noise, chopper-stabilized instrumentation

amplifier (12 nV/

√Hz @ 0.1 Hz) with a gain of 64X. This

device also includes a fourth-order

ΔΣ modulator fol-

lowed by a digital filter which provides twenty selectable

output word rates of 6.25, 7.5, 12.5, 15, 25, 30, 50, 60, 100,

120, 200, 240, 400, 480, 800, 960, 1600, 1920, 3200, and

3840 Sps (MCLK = 4.9152 MHz).

To ease communication between the ADC and a micro-

controller, the converter includes a simple three-wire se-

rial interface which is SPI and Microwire compatible with

a Schmitt-trigger input on the serial clock (SCLK).

High dynamic range, programmable output rates, and

flexible power supply options make this device an ideal

solution

for

weigh

scale

and

process

control

applications.

ORDERING INFORMATION

See page 35.

VA+

C1

C2

VREF+

VREF-

VD+

DIFFERENTIAL

4TH ORDER

ΔΣ

MODULATOR

PROGRAMMABLE

SINC FIR FILTER

AIN1+

AIN1-

SERIAL

INTERFACE

LATCH

CLOCK

GENERATOR

CALIBRATION

SRAM/CONTROL

LOGIC

DGND

CS

SDI

SDO

SCLK

OSC2

OSC1

A1

A0

VA-

64X

NOV ‘09

DS742F3

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