ADS1100A5IDBVT datasheet(6/23 Pages) TI1

No. de pieza	ADS1100A5IDBVT

Descripción Electrónicos	Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER

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Fabricante Electrónico	TI1 [Texas Instruments]

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ADS1100

6

SBAS239B

www.ti.com

THEORY OF OPERATION

The ADS1100 is a fully differential, 16-bit, self-calibrating,

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

and configure, the ADS1100 allows you to obtain precise

measurements with a minimum of effort.

The ADS1100 consists of a delta-sigma A/D converter core with

adjustable gain, a clock generator, and an I2C interface. Each of

these blocks are described in detail in the sections that follow.

ANALOG-TO-DIGITAL CONVERTER

The ADS1100 A/D converter core consists of a differential

switched-capacitor delta-sigma modulator followed by a digital

filter. The modulator measures the voltage difference between

the positive and negative analog inputs and compares it to a

reference voltage, which, in the ADS1100, is the power

supply. The digital filter receives a high-speed bitstream from

the modulator and outputs a code, which is a number

proportional to the input voltage.

OUTPUT CODE CALCULATION

The output code is a scalar value that is (except for clipping)

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 ADS1100 depends on the data rate, as shown in Table I.

TYPICAL CHARACTERISTICS (Cont.)

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

V

DD = 2.7V

V

DD = 5V

10

9

8

7

6

DATA RATE vs TEMPERATURE

–60

–40

–20

0

20

40

60

80

100

120

140

Temperature (

°C)

Data Rate = 8SPS

0

–20

–40

–60

–80

–100

FREQUENCY RESPONSE

0.1

1

10

100

1k

Input Frequency (Hz)

Data Rate = 8SPS

DATA RATE

NUMBER OF BITS

MINIMUM CODE MAXIMUM CODE

8SPS

16

–32,768

32,767

16SPS

15

–16,384

16,383

32SPS

14

–8192

8191

128SPS

12

–2048

2047

TABLE I. Minimum and Maximum Codes.

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

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

and power supply of VDD, the output code is given by the

expression:

Output Code = –1• Min Code • PGA •

V

IN+

( ) ( )

–

V

IN

DD

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

negated

minimum output code is used. The ADS1100 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.

For example, the ideal expression for output codes with a

data rate of 16SPS and PGA = 2 is:

Output Code = 16384 • 2 •

V

IN+

( ) ( )

–

V

IN

DD

The ADS1100 outputs all codes right-justified and sign-

extended. This makes it possible to perform averaging on the

higher data rate codes using only a 16-bit accumulator.

See Table II for output codes for various input levels.

SELF-CALIBRATION

The previous expressions for the ADS1100’s output code do

not account for the gain and offset errors in the modulator. To

compensate for these, the ADS1100 incorporates self-cali-

bration circuitry.

The self-calibration system operates continuously, and re-

quires no user intervention. No adjustments can be made to

the self-calibration system, and none need to be made. The

self-calibration system cannot be deactivated.

The offset and gain error figures shown in the Electrical

Characteristics include the effects of calibration.

Número de pieza similar - ADS1100A5IDBVT

Fabricante Electrónico	No. de pieza	Datasheet	Descripción Electrónicos
Burr-Brown (TI)	ADS1100A5IDBVT	282Kb / 18P	Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER
Texas Instruments	ADS1100A5IDBVT	486Kb / 22P	[Old version datasheet] Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER NOVEMBER 2003
	ADS1100A5IDBVT	882Kb / 24P	[Old version datasheet] Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER
	ADS1100A5IDBVTG4	882Kb / 24P	[Old version datasheet] Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER
	ADS1100A5IDBVTG4	486Kb / 22P	[Old version datasheet] Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER NOVEMBER 2003

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Descripción similar - ADS1100A5IDBVT

Fabricante Electrónico	No. de pieza	Datasheet	Descripción Electrónicos
Texas Instruments	ADS1100	486Kb / 22P	[Old version datasheet] Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER NOVEMBER 2003
Burr-Brown (TI)	ADS1100	282Kb / 18P	Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER
Texas Instruments	ADS1100	882Kb / 24P	[Old version datasheet] Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER
Texas Instruments	ADS850	304Kb / 15P	[Old version datasheet] 14-Bit, 10MSPS Self-Calibrating ANALOG-TO-DIGITAL CONVERTER
List of Unclassifed Man...	MN6400	1Mb / 8P	50kHz, 16-bit Self-Calibrating Sampling A/D Converter
National Semiconductor ...	ADC16061	905Kb / 21P	Self-Calibrating 16-Bit, 2.5MSPS, 390mW A/D Converter
List of Unclassifed Man...	MN6450	1Mb / 8P	47KHZ 16-BIT SELF-CALIBRATING SAMPLING A/D CONVERTER
API Technologies Corp	MN6400	1Mb / 8P	50kHz, 16-bit Self-Calibrating Sampling A/D Converter
API Technologies Corp	MN6450	1Mb / 8P	47kHz, 16-bit Self-calibrating Sampling A/D Converter
Micro Analog systems	MAS6501	205Kb / 16P	16-Bit Analog-to-Digital Converter

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