FEATURES
C0068 20-Bit Effective Resolution
C0068 High-Impedance Buffered Input
C0068 ±2.5V Differential Input Range
C0068 Pin-Compatible with ADS1244
C0068 0.0006% INL (typ), 0.0015% INL (max)
C0068 Simple Two-Wire Serial Interface
C0068 Simultaneous 50Hz and 60Hz Rejection
C0068 Single Conversions with Sleep Mode
C0068 Single-Cycle Settling
C0068 Self-Calibration
C0068 Well Suited for Multi-Channel Systems
C0068 Easily Connects to the MSP430
C0068 Current Consumption: 158µA
C0068 Analog Supply: 2.5V to 5.25V
C0068 Digital Supply: 1.8V to 3.6V
APPLICATIONS
C0068 Hand-Held Instrumentation
C0068 Portable Medical Equipment
C0068 Industrial Process Control
C0068 Test and Measurement Systems
DESCRIPTION
The ADS1245 is a 24-bit, delta-sigma analog-to-digital
converter (ADC). It offers excellent performance and very
low power in an MSOP-10 package and is well suited for
demanding high-resolution measurements, especially in
portable and other space- and power-constrained
systems.
The buffered input presents an impedance of 3GΩ, mini-
mizing measurement errors when using high-impedance
sources. The ADS1245 is compatible with ADS1244 and
offers a direct upgrade path for designs requiring higher in-
put impedance.
A third-order delta-sigma (∆Σ) modulator and digital filter
form the basis of the ADC. The analog modulator has a
±2.5V differential input range. The digital filter rejects both
50Hz and 60Hz signals, completely settles in one cycle,
and outputs data at 15 samples per second (SPS).
A simple, two-wire serial interface provides all the
necessary control. Data retrieval, self-calibration, and
Sleep mode are handled with a few simple waveforms.
When only single conversions are needed, the ADS1245
can be shut down (Sleep mode) while idle between
measurements to dramatically reduce the overall power
dissipation. Multiple ADS1245s can be connected
together to create a synchronously sampling multichannel
measurement system. The ADS1245 is designed to easily
connect to microcontrollers, such as the MSP430.
The ADS1245 supports 2.5V to 5.25V analog supplies and
1.8V to 3.6V digital supplies. Power is typically less than
470µW in normal operation and less than 1µW during
Sleep mode.
Digital
Filter
Serial
Interface
DRDY/DOUT
SCLK
CLK
AINN
AINP
VREFP VREFN AVDD
GND
DVDD
3rd−Order
Modulator
Buffer
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SBAS287A − JUNE 2003 − REVISED SEPTEMBER 2003
Low-Power, 24-Bit
Analog-to-Digital Converter
ADS1245
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Copyright  2003, Texas Instruments Incorporated
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.