ADS112C04IPWR datasheet(21/72 Pages) TI1

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Reference

Mux

Precision

Temperature

Sensor

AIN0

AIN1

AIN2

AIN3

AVDD

AVSS

DGND

REFP

REFN

2.048-V

Reference

10 A to

1.5 mA

MUX

DVDD

PGA

16-bit

û ADC

Digital Filter

and

2C Interface

Low Drift

Oscillator

ADS112C04

SDA

SCL

RESET

DRDY

ADS112C04

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SBAS894 – APRIL 2018

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8 Detailed Description

8.1 Overview

The ADS112C04 is a small, low-power, 16-bit, ΔΣ ADC that offers many integrated features to reduce system

cost and component count in applications measuring small sensor signals.

In addition to the ΔΣ ADC core and single-cycle settling digital filter, the device offers a low-noise, high input

impedance, programmable gain amplifier (PGA), an internal 2.048-V voltage reference, and a clock oscillator.

The device also integrates a highly linear and accurate temperature sensor as well as two matched

programmable current sources (IDACs) for sensor excitation. All of these features are intended to reduce the

required external circuitry in typical sensor applications and improve overall system performance. The device is

fully configured through four registers and controlled by six commands through an I2C-compatible interface. The

Functional Block Diagram section shows the device functional block diagram.

The ADS112C04 ADC measures a differential signal, VIN, which is the difference in voltage between nodes AINP

and AINN. The converter core consists of a differential, switched-capacitor, ΔΣ modulator followed by a digital

filter. The digital filter receives a high-speed bitstream from the modulator and outputs a code proportional to the

input voltage. This architecture results in a very strong attenuation of any common-mode signal.

The device has two available conversion modes: single-shot conversion and continuous conversion mode. In

single-shot conversion mode, the ADC performs one conversion of the input signal upon request and stores the

value in an internal data buffer. The device then enters a low-power state to save power. Single-shot conversion

mode is intended to provide significant power savings in systems that require only periodic conversions, or when

there are long idle periods between conversions. In continuous conversion mode, the ADC automatically begins

a conversion of the input signal as soon as the previous conversion is completed. New data are available at the

programmed data rate. Data can be read at any time without concern of data corruption and always reflect the

most recently completed conversion.

8.2 Functional Block Diagram

ADS112C04IPWR Datasheet(PDF) 21 Page - Texas Instruments

ADS112C04IPWR Datasheet(HTML) 21 Page - Texas Instruments

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