FEATURES

24 BITS NO MISSING CODES

INL: 0.0012% of FSR (max)

FULL-SCALE INPUT: ±2VREF

PGA FROM 1 TO 128

22 BITS EFFECTIVE RESOLUTION

PGA = 1), 19 BITS (PGA = 128)

SINGLE CYCLE SETTLING MODE

PROGRAMMABLE DATA OUTPUT RATES

UP TO 1kHz

ON-CHIP 1.25V/2.5V REFERENCE

ON-CHIP CALIBRATION

SPI COMPATIBLE

POWER SUPPLY: 2.7V to 5.25V

< 1mW POWER CONSUMPTION, VDD = 3V

APPLICATIONS

INDUSTRIAL PROCESS CONTROL

LIQUID/GAS CHROMATOGRAPHY

BLOOD ANALYSIS

SMART TRANSMITTERS

PORTABLE INSTRUMENTATION

WEIGH SCALES

PRESSURE TRANSDUCERS

DESCRIPTION

The ADS1217 is a precision, wide dynamic range, deltasigma,

Analog-to-Digital (A/D) converter with 24-bit resolution

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 Converter (DAC) 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 2nd-order,

delta-sigma modulator and programmable sinc filter. The

reference input is differential and can be used for ratiometric

measurements. The onboard current DACs 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

ADS1217 is designed for high-resolution measurement applications

in smart transmitters, industrial process control, weigh

scales, chromatography, and portable instrumentation.