Texas Instruments ADS1218 Data Sheet / Manual
Summary
Achieve ultra-precise data acquisition with this 24-bit delta-sigma Analog-to-Digital Converter. Featuring wide dynamic range, internal flash memory, and high-resolution multiplexed channels, it is ideal for demanding instrumentation. The accompanying technical manual provides comprehensive details on setup, programmable gain (PGA), error correction, SPI interfacing, and specialized applications like industrial control, weight scales, and smart transmitters. This tool is essential for engineers and developers building portable or complex measurement systems requiring exceptional accuracy.
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ADS1218
ADS1218
SBAS187 – SEPTEMBER 2001
8-Channel, 24-Bit
ANALOG-TO-DIGITAL CONVERTER with FLASH Memory
FEATURES DESCRIPTION
24 BITS NO MISSING CODES The ADS1218 is a precision, wide dynamic range, delta-sigma, Analog-to-
0.0015% INL Digital (A/D) converter with 24-bit resolution and FLASH memory operating from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to
22 BITS EFFECTIVE RESOLUTION
24 bits of no missing code performance and effective resolution of 22 bits.
(PGA = 1), 19 BITS (PGA = 128)
The eight input channels are multiplexed. Internal buffering can be selected
4K BYTES OF FLASH MEMORY
to provide a very high input impedance for direct connection to transducers
PROGRAMMABLE FROM 2.7V TO 5.25V
or low-level voltage signals. Burn out current sources are provided that allow
PGA FROM 1 TO 128
for the detection of an open or shorted sensor. An 8-bit Digital-to-Analog (D/
SINGLE CYCLE SETTLING MODE A) converter provides an offset correction with a range of 50% of the FSR
PROGRAMMABLE DATA OUTPUT RATES (Full-Scale Range).
UP TO 1k Hz The PGA (Programmable Gain Amplifier) provides selectable gains of 1 to
128 with an effective resolution of 19 bits at a gain of 128. The A/D
PRECISION ON-CHIP 1.25V/2.5V REFERENCE:
ACCURACY: 0.2% conversion is accomplished with a second-order delta-sigma modulator and DRIFT: 5ppm/°C programmable sinc filter. The reference input is differential and can be used for ratiometric conversion. The on-board current DACs (Digital-to-Analog
EXTERNAL DIFFERENTIAL REFERENCE
Converters) operate independently with the maximum current set by an
OF 0.1V TO 2.5V
external resistor.
ON-CHIP CALIBRATION
The serial interface is SPI compatible. Eight bits of digital I/O are also provided
PIN COMPATIBLE WITH ADS1216
that can be used for input or output. The ADS1218 is designed for high-resolution
SPI™ COMPATIBLE measurement applications in smart transmitters, industrial process control, weight
2.7V TO 5.25V scales, chromatography, and portable instrumentation.
< 1m W POWER CONSUMPTION
AGND AVDD RDAC VREFOUT VRCAP VREF+ VREF– XIN XOUT
8-Bit
IDAC2
APPLICATIONS IDAC
Clock Generator
1.25V or 2.5V
INDUSTRIAL PROCESS CONTROL 8-Bit
IDAC1 Reference
AVDD IDAC
LIQUID/GAS CHROMATOGRAPHY
2µA Offset
BLOOD ANALYSIS
SMART TRANSMITTERS
PORTABLE INSTRUMENTATION
AIN1 A = 1:128 Registers
AIN2 IN+ Program-
WEIGHT SCALES 2nd-Order
AIN3 mable RAM
MUX BUF PGA Controller
IN– Modulator Digital
PRESSURE TRANSDUCERS Filter 4K Bytes
AIN5 WREN
FLASH
SPI is a registered trademark of Motorola. AIN7
AINCOM
2µA Digital I/O Serial Interface DIN
Interface DOUT
AGND CS
D7...D0 DSYNCPDWN RESET DRDYBUFENDGNDDVDD
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.
PRODUCTION DATA information is current as of publication date. Copyright © 2001, Texas Instruments Incorporated Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
www.ti.com
Page Summary Contents For Texas Instruments ADS1218 Data Sheet / Manual
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 30 |
| File Size | 463.01 KB |
| Published | July 15, 2026 |
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Frequently Asked Questions
What is the effective resolution of the ADS1218 converter?
It provides 24 bits of no missing code performance, with an effective resolution of up to 22 bits (PGA = 1).
How can I adjust the signal gain using the ADS1218?
The device features a Programmable Gain Amplifier (PGA) that allows selectable gains from 1 to 128.
What type of interface is used for data output and clocking?
The serial interface is SPI compatible, and eight bits of digital I/O are also provided.
What operating temperature range should the ADS1218 handle?
The recommended operating temperature range is –40°C to +85°C.