ADS1218| Datasheet

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Burr Brown Products from Texas Instruments

ADS1218
SBAS187C SEPTEMBER 2001 REVISED SEPTEMBER 2005

8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory
FEATURES
24 BITS NO MISSING CODES 0.0015% INL 22 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128) 4K BYTES OF FLASH MEMORY PROGRAMMABLE FROM 2.7V TO 5.25V PGA FROM 1 TO 128 SINGLE CYCLE SETTLING MODE PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz PRECISION ON-CHIP 1.25V/2.5V REFERENCE: ACCURACY: 0.2% DRIFT: 5ppm/ C EXTERNAL DIFFERENTIAL REFERENCE OF 0.1V TO 2.5V ON-CHIP CALIBRATION PIN-COMPATIBLE WITH ADS1216 SPITM COMPATIBLE 2.7V TO 5.25V < 1mW POWER CONSUMPTION 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.
AGND AVDD RDAC VREFOUT VRCAP VREF+ VREF- XIN XOUT

IDAC2

APPLICATIONS
INDUSTRIAL PROCESS CONTROL LIQUID/GAS CHROMATOGRAPHY BLOOD ANALYSIS SMART TRANSMITTERS PORTABLE INSTRUMENTATION WEIGHT SCALES PRESSURE TRANSDUCERS
IDAC1

8-Bit IDAC 1.25V or 2.5V Reference Clock Generator

8-Bit IDAC

Offset DAC

AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AINCOM POL Serial Interface SCLK DIN DOUT CS DVDD DGND BUFEN D0 ... D7 PDWN DSYNC RESET DRDY MUX BUF + PGA 2nd-Order Modulator
Program- mable Digital F ilter

Registers RAM 4K Bytes FLASH

Controller

WREN

DESCRIPTION
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.

Digital I/O Interface

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. SPI is a trademark of Motorola. All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.