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.