ADS1113 datasheet(28/50 Pages) TI2

28 / 50 page

0.1 µF

VDD

DIN

DOUT

Microcontroller or

Microprocessor

with SPI Port

SCLK

GND

AIN0

AIN1

DIN

DOUT/

DRDY

VDD

AIN3

AIN2

Device

Inputs Selected

from Configuration

SCLK

50 W

ADS1118

SBAS457F – OCTOBER 2010 – REVISED SEPTEMBER 2019

www.ti.com

Product Folder Links: ADS1118

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10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Application Information

The ADS1118 is a precision, 16-bit ΔΣ ADC that offers many integrated features to ease the measurement of the

most common sensor types including various type of temperature and bridge sensors. The following sections

give example circuits and suggestions for using the ADS1118 in various situations.

10.1.1 Serial Interface Connections

The principle serial interface connections for the ADS1118 are shown in Figure 45.

Figure 45. Typical Connections of the ADS1118

Most microcontroller SPI peripherals can operate with the ADS1118. The interface operates in SPI mode 1

where CPOL = 0 and CPHA = 1. In SPI mode 1, SCLK idles low and data are launched or changed only on

SCLK rising edges; data are latched or read by the master and slave on SCLK falling edges. Details of the SPI

communication protocol employed by the ADS1118 can be found in the Timing Requirements: Serial Interface

section.

It is a good practice to place 50-Ω resistors in the series path to each of the digital pins to provide some short

circuit protection. Care must be taken to still meet all SPI timing requirements because these additional series

resistors along with the bus parasitic capacitances present on the digital signal lines could slew the signals.

The fully-differential input of the ADS1118 is ideal for connecting to differential sources (such as thermocouples

and thermistors) with a moderately low source impedance. Although the ADS1118 can read fully-differential

signals, the device cannot accept negative voltages on either of its inputs because of ESD protection diodes on

each pin. When an input exceeds supply or drops below ground, these diodes turn on to prevent any ESD

damage to the device.

10.1.2

GPIO Ports for Communication

Most microcontrollers have programmable input/output (I/O) pins that can be set in software to act as inputs or

outputs. If an SPI controller is not available, the ADS1118 can be connected to GPIO pins and the SPI bus

protocol can be simulated. Using GPIO pins to generate the SPI interface only requires that the pins be

configured as push or pull inputs or outputs. Furthermore, if the SCLK line is held low for more than 28 ms, the

communication times out. This condition means that the GPIO ports must be capable of providing SCLK pulses

with no more than 28 ms between pulses.

ADS1113 Datasheet(PDF) 28 Page - Texas Instruments

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