CS5516 datasheet(10/41 Pages) CIRRUS

10 / 41 page

GENERAL DESCRIPTION

The CS5516 and CS5520 are monolithic CMOS

A/D converters which include an instrumentation

amplifier input, an on-chip programmable gain

amplifier, and a DAC for offset trimming.

While the devices are optimized for ratiometric

measurement of Wheatstone bridge applications,

they can be used for general purpose low-level

signal measurement.

Each of the devices includes a two-channel dif-

ferential delta-sigma modulator (the signal

measurement input and the reference input are

digitized independently before a digital output

word is computed), a calibration microcontroller,

a two-channel digital filter, a programmable in-

strumentation amplifier block, a 4-bit DAC for

coarse offset trimming, circuitry for generation

and demodulation of AC (actually switched DC)

bridge excitation, and a serial port. The CS5516

outputs 16-bit words; the CS5520 outputs 20-bit

words.

The CS5516/20 devices can measure either

unipolar or bipolar signals.

Self-calibration is

utilized to maximize performance of the meas-

urement system.

To better understand the

capabilities of the CS5516/20, it is helpful to ex-

amine some of the error sources in bridge

measurement systems.

XOUT

VD+

VA+

VREF+

VREF-

DGND

VA-

µF

AIN+

AIN-

MDRV-

0.1

µF

BX1

BX2

SCLK

SOD

SID

SMODE

CS5516

CS5520

XIN

0.1

µF

Ω

0.1

µF

VD-

AGND2

MDRV+

DRDY

Ω

+5V

Analog

Supply

-5V

Analog

Supply

Excitation Supply

Synch. Signals

0.1

µF

µF1 µF

µF

RST

AGND1

320

Bridge

Excitation

Supply

Unused logic inputs

must be connected

to DGND or VD+

Optional

Clock

Source

Control

Logic

Serial

Data

Interface

Figure 1. System Connection Diagram: AC Excitation Mode Using External Excitation

CS5516, CS5520

DS74F1

DS74F2

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