ADS1112 datasheet(6/18 Pages) BURR-BROWN

Numer części	ADS1112

Szczegółowy opis	16-Bit Analog-to-Digital Converter with Input Multiplexer and Onboard Reference

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Producent	BURR-BROWN [Burr-Brown (TI)]

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6 / 18 page

ADS1112

SBAS282D − JUNE 2003 − REVISED MARCH 2004

www.ti.com

6

TYPICAL CHARACTERISTICS (continued)

At TA = 25°C and VDD = 5V, unless otherwise noted.

THEORY OF OPERATION

The ADS1112 is a 16-bit, self-calibrating, delta-sigma A/D

converter with an input multiplexer. Extremely easy to de-

sign with and configure, the ADS1112 allows precise mea-

surements to be obtained with a minimum of effort.

The ADS1112 consists of a delta-sigma A/D converter

core with adjustable gain, a 2.048V reference, a clock os-

cillator, and an I2C interface. Each of these blocks are de-

scribed in detail in the sections that follow.

ANALOG-TO-DIGITAL CONVERTER

The ADS1112 A/D converter core consists of a differential

switched-capacitor delta-sigma modulator followed by a

digital filter. The modulator measures the voltage differ-

ence between the positive and negative analog inputs se-

lected by the input multiplexer and compares it to a refer-

ence voltage, which, in the ADS1112, is 2.048V. The digital

filter receives a high-speed bitstream from the modulator

and outputs a code, which is a number proportional to the

input voltage.

MULTIPLEXER

The ADS1112 has an input multiplexer that provides for

two differential or three single-ended input channels. Two

bits in the configuration register control the multiplexer

setting.

VOLTAGE REFERENCE

The ADS1112 contains an onboard 2.048V voltage refer-

ence. This reference is always used as the ADC voltage

reference; an external reference cannot be connected.

The ADS1112 voltage reference is internal only, and can-

not be measured directly or used by external circuitry.

The onboard reference specifications are part of the over-

all gain and drift specifications of the ADS1112. The con-

verter drift and gain error specifications reflect the perfor-

mance of the onboard reference as well as the

performance of the A/D converter core. There are no sepa-

rate specifications for the onboard reference itself.

OUTPUT CODE CALCULATION

The output code is a scaled value that is proportional, ex-

cept for clipping, to the voltage difference between the two

analog inputs. The output code is confined to a finite range

of numbers; this range depends on the number of bits

needed to represent the code. The number of bits needed

to represent the output code for the ADS1112 depends on

the data rate, as shown in Table 1.

DATA RATE

NUMBER OF

BITS

MINIMUM

CODE

MAXIMUM

CODE

15SPS

16

−32,768

32,767

30SPS

15

−16,384

16,383

60SPS

14

−8192

8191

240SPS

12

−2048

2047

Table 1. Minimum and Maximum Codes

For a minimum output code of Min Code, gain setting of the

PGA, and positive and negative input voltages of VIN+ and

VIN−, the output code is given by the expression:

Output Code

+ −1

Min Code

PGA

(V

IN

)) * (VIN*)

2.048V

In the previous expression, it is important to note that the

negated minimum output code is used. The ADS1112

outputs codes in binary two’s complement format, so the

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