FEATURES
240SPS Data Rate with 4MHz Clock
20-Bit Effective Resolution
Input Multiplexer with Four Differential
Channels
Pin-Selectable, High-Impedance Input Buffer
±5V Differential Input Range
0.0003% INL (typ), 0.0015% INL (max)
Self-Calibrating
Simple 2-Wire Serial Interface
On-Chip Temperature Sensor
Single Conversions with Standby Mode
Low Current Consumption: 300μA
Analog Supply: 2.7V to 5.5V
Digital Supply: 2.7V to 5.5V

APPLICATIONS
Hand-Held Instrumentation
Portable Medical Equipment
Industrial Process Control
Weigh Scales

DESCRIPTION
The ADS1224 is a 4-channel, 24-bit, delta-sigma analog-
to-digital (A/D) converter. It offers excellent performance
and low power in a TSSOP-20 package. The
ADS1224 is well-suited for demanding, high-resolution
measurements, especially in portable systems and other
space-saving and power-constrained applications.
A delta-sigma (ΔΣ) modulator and digital filter form the
basis of the A/D converter. The analog modulator has
a ±5V differential input range. An input multiplexer
(MUX) is used to select between four separate
differential input channels. A buffer can be selected to
increase the input impedance of the measurement.
A simple, 2-wire serial interface provides all the
necessary control. Data retrieval, self-calibration, and
Standby mode are handled with a few simple
waveforms. When only single conversions are needed,
the ADS1224 can be quickly shut down (Standby mode)
while idle between measurements to dramatically
reduce the overall power consumption. Multiple
ADS1224s can be connected together to create a
synchronously sampling multichannel measurement
system. The ADS1224 is designed to easily connect to
microcontrollers, such as the MSP430.
The ADS1224 supports 2.7V to 5.5V analog supplies
and 2.7V to 5.5V digital supplies. Power is typically less
than 1mW in 3V operation and less than 1μW during
Standby mode.