FEATURES
24 BITS—NO MISSING CODES
19 BITS EFFECTIVE RESOLUTION UP TO
20kHz DATA RATE
LOW NOISE: 1.5ppm
DIFFERENTIAL INPUTS
INL: 15ppm (max)
EXTERNAL REFERENCE (0.5V to 5V)
POWER-DOWN MODE
SYNC MODE
LOW POWER: 8mW at 20kHz
5mW at 10kHz

APPLICATIONS
CARDIAC DIAGNOSTICS
DIRECT THERMOCOUPLE INTERFACES
BLOOD ANALYSIS
INFRARED PYROMETERS
LIQUID/GAS CHROMATOGRAPHY
PRECISION PROCESS CONTROL

DESCRIPTION
The ADS1251 is a precision, wide dynamic range, deltasigma,
Analog-to-Digital (A/D) converter with 24-bit resolution
operating from a single +5V supply. The delta-sigma
architecture features wide dynamic range, and 24 bits of no
missing code performance. Effective resolution of 19 bits
(1.5ppm of rms noise) is achieved at conversion rates up to
20kHz.
The ADS1251 is designed for high-resolution measurement
applications in cardiac diagnostics, smart transmitters, industrial
process control, weigh scales, chromatography, and
portable instrumentation. The converter includes a flexible,
2-wire synchronous serial interface for low-cost isolation.
The ADS1251 is a single-channel converter and is offered in
an SO-8 package. It is pin-compatible with the faster ADS1252
(41.7kHz data rate).