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ADS1226

24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator

Analog Devices 

BurrĆBrown Products

from Texas Instruments

ADS1225 ¨

ADS1226 ¨

ADS1225

ADS1226

SBAS346 – MAY 2006

24-Bit Analog-to-Digital Converter

with One- and Two-Channel Differential Inputs and Internal Oscillator

FEATURES

• 100SPS Data Rate (High-Speed Mode)

• Single-Cycle Settling

• Easy Conversion Control with START Pin

• Automatic Shutdown

• Low Noise: 4µVRMS Noise (High-Resolution

Mode)

• Input Multiplexer with Two Differential

Channels (ADS1226)

• Voltage Reference Supports Ratiometric

Measurements

• Self-Calibrating

• Simple Read-Only 2-Wire Serial Interface

• Internal High-Impedance Input Buffer

• Internal Temperature Sensor

• Internal Oscillator

• Low-Power: 1mW While Operating, < 1µA

During Shutdown

• Analog and Digital Supplies: 2.7V to 5.5V

APPLICATIONS

• Hand-Held Instrumentation

• Portable Medical Equipment

• Industrial Process Control

TEMPEN

AVDD

DESCRIPTION

The ADS1225 and ADS1226 are 24-bit delta-sigma

analog-to-digital (A/D) converters. They offer

excellent performance, ease-of-use, and low power

in a small 4mm × 4mm QFN package and are

well-suited for demanding high-resolution

measurements, especially in portable and other

space-saving and power-constrained applications.

The ADS1225 and ADS1226 convert on command

using a dedicated START pin. Simply pulse this pin

to initiate a conversion. Data is read in a single cycle

for retrieval over a 2-wire serial interface that easily

connects to popular microcontrollers like the

MSP430. After the conversion completes, the

ADS1225 and ADS1226 automatically shuts down all

circuitry.

Internal features include a two-channel multiplexer

(ADS1226), selectable input buffer, temperature

sensor, and oscillator. The full-scale range is defined

by the external voltage reference with support

provided for up to a 5V differential input signal. Two

operating modes allow for speed (100SPS data rate,

15µVRMS noise) or resolution (4µVRMS noise, 16SPS

data rate).

The ADS1225/6 supports 2.7 to 5.5V analog and

digital supplies. Power consumption is 1mW while

converting with 3V supplies. The ADS1225 and

ADS1226 are fully specified over an extended

industrial temperature range of –40°C to +105°C.

VREFP VREFN DVDD

AINP1

AINN1

AINP2

AINN2

MUX

Buffer

START

DS

ADC

Serial Interface

SCLK

DRDY/DOUT

Oscillator

MODE

MUX

ADS1226 Only

BUFEN

GND

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Copyright © 2006, Texas Instruments Incorporated

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