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CS5516

16/20-bit bridge transducer A/D conveter

Cirrus Logic 

CS5516, CS5520

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.

+5V

Analog

Supply 1 µF

Bridge

Excitation

Supply

-

Unused logic inputs

must be connected

to DGND or VD+

-5V

Analog

Supply

10 Ω

0.1 µF

0.1 µF 1 µF

3

1 µF

VA+

2 MDRV-

20

VD+

XOUT 23

1 MDRV+

12 BX1

Excitation Supply

Synch. Signals

11

BX2

CS5516

CS5520

XIN 22

SCLK 16

18

9 VREF+

SOD

SID 17

+

10 VREF-

SMODE 24

Optional

Clock

Source

Serial

Data

Interface

6 AIN+

7 AIN-

5 AGND1

8 AGND2

DRDY 15

RST 13

CS 14

DGND 19

Control

Logic

0.1 µF 1 µF

VA-

VD-

4

21

10 Ω

1 µF

0.1 µF

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

1100

DS74F21

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