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The ADS1218 is a precision, wide dynamic range, delta-sigma, Analog-to-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 24 bits of no missing code performance and effective resolution of 22 bits.
The eight input channels are multiplexed. Internal buffering can be selected to provide a very high input impedance for direct connection to transducers or low-level voltage signals. Burnout current sources are provided that allow for the detection of an open or shorted sensor. An 8-bit Digital-to-Analog (D/A) converter provides an offset correction with a range of 50% of the FSR (Full-Scale Range).
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 conversion is accomplished with a second-order delta-sigma modulator and programmable sinc filter. The reference input is differential and can be used for ratiometric conversion. The on-board current DACs (Digital-to-Analog Converters) operate independently with the maximum current set by an external resistor.
The serial interface is SPI-compatible. Eight bits of digital I/O are also provided that can be used for input or output. The ADS1218 is designed for high-resolution measurement applications in smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | 8-Channel, 24-Bit, Analog-to-Digital Converter with FLASH Memory datasheet (Rev. C) | 26 Sep 2005 | |
| Application note | Calculating Conversion Latency and System Cycle Time for Delta-Sigma ADCs (Rev. A) | PDF | HTML | 18 Mar 2024 | |
| Application note | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 29 Mar 2023 | |
| E-book | Fundamentals of Precision ADC Noise Analysis (Rev. A) | 19 Jun 2020 | ||
| Application note | Measuring Temperature with the ADS1216, ADS1217, or ADS1218 (Rev. B) | 16 Nov 2017 | ||
| Application note | Measuring Single-Ended 0V-5V Signals with Differential Delta-Sigma ADCs (Rev. A) | 18 May 2015 | ||
| Application note | The Offset DAC (Rev. A) | 01 Apr 2015 | ||
| E-book | Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs | 19 Mar 2015 | ||
| Application note | Calibration Routines and Register Value Generation for the ADS121x Series | 19 Jun 2003 | ||
| Application note | Inputs Currents for High-Resolution ADCs | 06 Mar 2003 |
For additional terms or required resources, click any title below to view the detail page where available.
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TQFP (PFB) | 48 | Ultra Librarian |
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Analog Engineer's Calc Installer
General calculator tool for analog design support.
This is the first release of this tool.