FUNCTIONAL BLOCK DIAGRAM

? Matched programmable excitation currents

? Internal clock oscillator

? On-chip bias voltage generator

? Low-side power switch

? General-purpose outputs

? Multiple filter options

? Internal temperature sensor

? Self and system calibration

? Sensor burnout detection

? Automatic channel sequencer

? Per channel configuration

? Power supply: 2.7 V to 3.6 V and ±1.8 V

? Independent interface power supply

? Power-down current: 5 μA maximum

? Temperature range: ?40°C to +125°C

? 32-lead LFCSP

? 3-wire or 4-wire serial interface

? SPI, QSPI, MICROWIRE, and DSP compatible

? Schmitt trigger on SCLK

? ESD: 4 kV

FEATURES

? Functional safety approved to SC3 by TüV Rheinland, File

Number 968/FSP 2188.01/23

? Three power modes

? RMS noise

? Low power: 24 nV rms at 1.17 SPS, gain = 128 (255 μA

typical)

? Mid power: 20 nV rms at 2.34 SPS, gain = 128 (355 μA

typical)

? Full power: 23 nV rms at 9.4 SPS, gain = 128 (930 μA typical)

? Up to 22 noise free bits in all power modes (gain = 1)

? Output data rate

? Full power: 9.38 SPS to 19,200 SPS

? Mid power: 2.34 SPS to 4800 SPS

? Low power: 1.17 SPS to 2400 SPS

? Rail-to-rail analog inputs for gains > 1

? Simultaneous 50 Hz/60 Hz rejection at 25 SPS (single cycle settling)

? Diagnostic functions (which aid safe integrity level (SIL) certification)

? Crosspoint multiplexed analog inputs

? 4 differential/7 pseudodifferential inputs

? Programmable gain (1 to 128)

? Band gap reference with 15 ppm/°C drift maximum (70 μA)

APPLICATIONS

? Temperature measurement

? Pressure measurement

? Industrial process control

? Instrumentation

? Smart transmitters