ADS1014IRUGR datasheet(11/33 Pages) TI1

Numer części	ADS1014IRUGR

Szczegółowy opis	Ultra-Small, Low-Power, 12-Bit Analog-to-Digital Converter with Internal Reference

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Producent	TI1 [Texas Instruments]

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0x7FF0

-

FS

¼

0

¼

FS

InputVoltage(AIN

AIN )

-

P

N

0x7FE0

0x0001

0x0000

0x8000

0xFFF0

0x8010

-

FS

2

-

1

11

2

11

FS

2

-

1

11

2

11

ADS1013

ADS1014

ADS1015

www.ti.com

SBAS473C – MAY 2009 – REVISED OCTOBER 2009

DATA FORMAT

The

ADS1013/4/5

digital

filter

provides

some

attenuation of high-frequency noise, but the digital

The ADS1013/4/5 provide 12 bits of data in binary

Sinc filter frequency response cannot completely

twos complement format. The positive full-scale input

replace an anti-aliasing filter. For a few applications,

produces an output code of 7FF0h and the negative

some external filtering may be needed; in such

full-scale input produces an output code of 8000h.

instances, a simple RC filter is adequate.

The output clips at these codes for signals that

exceed full-scale. Table 4 summarizes the ideal

When designing an input filter circuit, be sure to take

output codes for different input signals. Figure 13

into account the interaction between the filter network

shows code transitions versus input voltage.

and the input impedance of the ADS1013/4/5.

Table 4. Input Signal versus Ideal Output Code

OPERATING MODES

INPUT SIGNAL, VIN

The ADS1013/4/5 operate in one of two modes:

(AINP – AINN)

IDEAL OUTPUT CODE(1)

continuous conversion or single-shot. In continuous

≥ FS (211 – 1)/211

7FF0h

conversion mode, the ADS1013/4/5 continuously

+FS/211

0010h

perform conversions. Once a conversion has been

completed, the ADS1013/4/5 place the result in the

0

Conversion register and immediately begins another

–FS/211

FFF0h

conversion. In single-shot mode, the ADS1013/4/5

≤ –FS

8000h

wait until the OS bit is set high. Once asserted, the bit

is set to '0', indicating that a conversion is currently in

1. Excludes the effects of noise, INL, offset, and

progress. Once conversion data are ready, the OS bit

gain errors.

reasserts and the device powers down. Writing a '1'

to the OS bit during a conversion has no effect.

RESET AND POWER-UP

When the ADS1013/4/5 powers up, a reset is

performed.

As

part

of

the

reset

process,

the

ADS1013/4/5 set all of the bits in the Config register

to the respective default settings.

The ADS1013/4/5 respond to the I2C general call

reset command. When the ADS1013/4/5 receive a

general call reset, an internal reset is performed as if

the device had been powered on.

DUTY CYCLING FOR LOW POWER

For many applications, the improved performance at

low data rates may not be required. For these

applications, the ADS1013/4/5 support duty cycling

Figure 13. ADS1013/4/5 Code Transition Diagram

that

can

yield

significant

power

savings

by

periodically requesting high data rate readings at an

effectively

lower

data

rate.

For

example,

an

ALIASING

ADS1013/4/5 in power-down mode with a data rate

As with any data converter, if the input signal

set

to

3300SPS

could

be

operated

by

a

contains frequencies greater than half the data rate,

microcontroller that instructs a single-shot conversion

aliasing occurs. To prevent aliasing, the input signal

every 7.8ms (128SPS). Because a conversion at

must be bandlimited. Some signals are inherently

3300SPS

only

requires

about

0.3ms,

the

bandlimited.

For

example,

the

output

of

a

ADS1013/4/5

enter

power-down

mode

for

the

thermocouple, which has a limited rate of change.

remaining

7.5ms.

In

this

configuration,

the

Nevertheless, they can contain noise and interference

ADS1013/4/5 consume about 1/25th the power of the

components. These components can fold back into

ADS1013/4/5 operated in continuous conversion

the sampling band in the same way as with any other

mode. The rate of duty cycling is completely arbitrary

signal.

and

is

defined

by

the

master

controller.

The

ADS1013/4/5 offer lower data rates that do not

implement duty cycling and offer improved noise

performance if it is needed.

Submit Documentation Feedback

11

Product Folder Link(s): ADS1013 ADS1014 ADS1015

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