ADS1110A3IDBVT datasheet(6/17 Pages) TI

Part #	ADS1110A3IDBVT

Description	16-Bit ANALOG-TO-DIGITAL CONVERTER with Onboard Reference

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Manufacturer	TI [Texas Instruments]

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ADS1110

SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003

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6

TYPICAL CHARACTERISTICS (continued)

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

THEORY OF OPERATION

The ADS1110 is a fully differential, 16-bit, self-calibrating,

delta-sigma A/D converter. Extremely easy to design with

and configure, the ADS1110 allows precise measure-

ments to be obtained with a minimum of effort.

The ADS1110 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 ADS1110 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 and

compares it to a reference voltage, which, in the ADS1110,

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.

VOLTAGE REFERENCE

The ADS1110 contains an onboard 2.048V voltage refer-

ence. This reference is always used as the A/D converter’s

voltage reference; an external reference cannot be con-

nected. The ADS1110’s voltage reference is internal only,

and cannot be measured directly or used by external cir-

cuitry.

The onboard reference’s specifications are part of the

ADS1110’s overall gain and drift specifications. The con-

verter’s drift and gain error specifications reflect the perfor-

mance of the onboard reference as well as the perfor-

mance of the A/D converter core. There are no separate

specifications for the onboard reference itself.

OUTPUT CODE CALCULATION

The output code is a scalar value that is, except for clip-

ping, proportional 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 ADS1110 de-

pends 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

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 ADS1110

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

absolute values of the minima and maxima are not the

same; the maximum n−bit code is 2n−1 − 1, while the

minimum n−bit code is −1

× 2n−1.

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ADS1110A3IDBVT Datasheet(PDF) 6 Page - Texas Instruments

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