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CS5525-BS

16-Bit/20-Bit Multi-Range ADC with 4-Bit Latch

Cirrus Logic 

CS5525

CS5526

16-Bit/20-Bit Multi-Range ADC with 4-Bit Latch

Features

Delta-Sigma A/D Converter

- Linearity Error: 0.0015%FS

- Noise Free Resolution: 18-bits

Bipolar/Unipolar Input Ranges

- 25 mV, 55 mV, 100 mV, 1 V, 2.5 V and 5 V

Chopper Stabilized Instrumentation Amplifier

On-Chip Charge Pump Drive Circuitry

4-Bit Output Latch

Simple three-wire serial interface

- SPI™ and Microwire™ Compatible

- Schmitt Trigger on Serial Clock (SCLK)

Programmable Output Word Rates

- 3.76 Hz to 202Hz (XIN = 32.768 kHz)

- 11.47 Hz to 616 Hz (XIN = 100 kHz)

Output Settles in One Conversion Cycle

Simultaneous 50/60 Hz Noise Rejection

System and Self-Calibration with

Read/Write Registers

Single +5 V Analog Supply

+3.0 V or +5 V Digital Supply

Low Power Mode Consumption: 4.9 mW

- 1.8 mW in 1 V, 2.5 V, and 5 V Input Ranges

General Description

The 16-bit CS5525 and the 20-bit CS5526 are highly in-

tegrated ∆Σ A/D converters which include an

instrumentation amplifier, a PGA (programmable gain

amplifier), eight digital filters, and self and system cali-

bration circuitry.

The converters are designed to provide their own nega-

tive supply which enables their on-chip instrumentation

amplifiers to measure bipolar ground-referenced signals

≤±100 mV. By directly supplying NBV with -2.5 V and

with VA+ at 5 V, ±2.5 V signals (with respect to ground)

can be measured.

The digital filters provide programmable output update

rates between 3.76 Hz to 202 Hz (XIN = 32.768 kHz).

Output word rates can be increased by approximately 3X

by using XIN = 100 kHz. Each filter is designed to settle

to full accuracy for its output update rate in one conver-

sion cycle. The filters with word rates of 15 Hz or less

(XIN = 32.768 kHz) reject both 50 and 60 Hz (±3 Hz) line

interference simultaneously.

Low power, single conversion settling time, programma-

ble output rates, and the ability to handle negative input

signals make these single supply products ideal solu-

tions for isolated and non-isolated applications.

ORDERING INFORMATION

See page26.

VA+

AGND

VREF+ VREF-

DGND

VD+

AIN+

AIN-

+

X20

-

Programmable

Gain

NBV

A0

A1

A2

A3

Latch

Calibration

Memory

Differential

4th Order

Delta-Sigma

Modulator

Digital Filter

Calibration µC

Clock

Gen.

Calibration

Register

Control

Register

Output

Register

CS

SCLK

SDI

SDO

Cirrus Logic, Inc.

www.cirrus.com

CPD

XIN XOUT

Copyright  Cirrus Logic, Inc. 2003

(All Rights Reserved)

Nov ‘03

DS202F3

1

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