FEATURES
20-BIT EFFECTIVE RESOLUTION
CURRENT CONSUMPTION: 90μA
ANALOG SUPPLY: 2.5V to 5.25V
DIGITAL SUPPLY: 1.8V to 3.6V
±5V DIFFERENTIAL INPUT RANGE
0.0002% INL (TYP), 0.0008% INL (MAX)
SIMPLE 2-WIRE SERIAL INTERFACE
SIMULTANEOUS 50Hz AND 60Hz REJECTION
SINGLE CONVERSIONS WITH SLEEP MODE
SINGLE-CYCLE SETTLING
SELF-CALIBRATION
WELL-SUITED FOR MULTICHANNEL SYSTEMS
EASILY CONNECTS TO THE MSP430

APPLICATIONS
HAND-HELD INSTRUMENTATION
PORTABLE MEDICAL EQUIPMENT
INDUSTRIAL PROCESS CONTROL
WEIGH SCALES

DESCRIPTION
The ADS1244 is a 24-bit, delta-sigma Analog-to-Digital (A/D)
converter. 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.
A 3rd-order delta-sigma modulator and digital filter form the
basis of the A/D converter. The analog modulator has a ±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.
A simple, 2-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 ADS1244 can be shut down
(Sleep Mode) while idle between measurements to dramatically
reduce the overall power dissipation. Multiple ADS1244s
can be connected together to create a synchronously sampling
multichannel measurement system. The ADS1244 is
designed to easily connect to microcontrollers, such as the
MSP430.
The ADS1244 supports 2.5V to 5.25V analog supplies and
1.8V to 3.6V digital supplies. Power is typically less than
270μW in normal operation and less than 1μW during Sleep
Mode.