Texas Instruments ADS1222 Data Sheet Handbook User Guide
Summary
The ADS1222 is a high-performance, low-power 24-bit delta-sigma Analog-to-Digital Converter (ADC) designed for precise measurement applications. It offers robust features like excellent effective resolution and single conversion modes while enabling ultra-low standby power consumption. This technical manual details the ADC's comprehensive specifications, including usage instructions, electrical characteristics, and optimal operating procedures. It is essential reading for engineers developing portable medical devices, industrial control systems, and precision hand-held instrumentation requiring high-resolution data acquisition.
Page 1 Text Content
查询ADS1222供应商
SBAS314A − APRIL 2004 − REVISED SEPTEMBER 2004
FEATURES DESCRIPTION 240SPS Data Rate with 4MHz Clock The ADS1222 is a 2-channel, 24-bit, delta-sigma ana-
log-to-digital (A/D) converter. It offers excellent perfor-
20-Bit Effective Resolution
mance and low power in a TSSOP-14 package. The
Input Multiplexer with Two Differential
ADS1222 is well-suited for demanding, high-resolution
Channels
measurements, especially in portable systems and oth-
Pin-Selectable, High-Impedance Input Buffer
er space-saving and power-constrained applications.
±5V Differential Input Range
A delta-sigma modulator and digital filter form the basis
0.0003% INL (typ), 0.0015% INL (max) of the A/D converter. The analog modulator has a ±5V
Self-Calibrating differential input range. An input multiplexer (mux) is used to select between two separate differential input
Simple 2-Wire Serial Interface
channels. A buffer can be selected to increase the input
On-Chip Temperature Sensor
impedance of the measurement.
Single Conversions with Standby Mode
A simple, 2-wire serial interface provides all the
Low Current Consumption: 300µA necessary control. Data retrieval, self-calibration, and
Analog Supply: 2.7V to 5.5V Standby mode are handled with a few simple waveforms. When only single conversions are needed, APPLICATIONS the ADS1222 can be quickly shut down (Standby mode) while idle between measurements to dramatically
Hand-Held Instrumentation
reduce the overall power consumption. Multiple
Portable Medical Equipment ADS1222s can be connected together to create a
Industrial Process Control synchronously sampling multichannel measurement system. The ADS1222 is designed to easily connect to
Weigh Scales
microcontrollers, such as the MSP430. The ADS1222 supports 2.7V to 5.5V supplies. Power is typically less than 1m W in 3V operation and less than 1µW during Standby mode.
TEMPEN VDD VREFP VREFN
AINP1
Digital Filter
AINN1 ∆Σ SCLK
Mux Buffer and
Modulator
AINP2 DRDY/DOUT
Serial Interface
AINN2
BUFEN GNDMUX
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Page Summary Contents For Texas Instruments ADS1222 Data Sheet Handbook User Guide
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 21 |
| File Size | 232.00 KB |
| Published | July 15, 2026 |
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Frequently Asked Questions
What is the core resolution and functionality of the ADS1222?
It is a 2-channel, 24-bit delta-sigma A/D converter offering excellent performance and low power consumption.
How can I reduce overall power consumption when using the device?
Use Standby mode when only single conversions are needed; this process can dramatically reduce total power use (less than 1µW).
What is the allowable voltage range for powering the ADS1222?
The Analog Supply must operate within a range of 2.7V to 5.5V.
What types of systems are suggested applications for this converter?
Recommended applications include portable medical equipment, hand-held instrumentation, and industrial process control systems.