Linear Technology LTC2431IMS#PBF

Description
The LTC2430/LTC2431 are 20-bit, 2.7V to 5.5V micropower differential AΣ analog-to-digital converters with an integrated oscillator, 3ppm INL, and 0.56ppm RMS noise. They utilize delta-sigma technology and provide single-cycle settling time for multiplexed applications. The converters accept any external differential reference voltage from 0.1V to Vcc for flexible ratiometric and remote sensing measurement configurations. The full-scale differential input range is from -0.5VREF to 0.5VREF-. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCм, may be independently set anywhere within GND to Vcc. The DC common mode input rejection is better than 120dB. The LTC2430/LTC2431 communicate through a flexible 3-wire digital interface that is compatible with SPI and MICROWIRE™ protocols.

Features
20-Bit No Latency AΣ™ ADCs with Differential Input
Low Supply Current (200μA in Conversion Mode and 4μA in Autosleep Mode)
Differential Input and Differential Reference with GND to Vcc Common Mode Range
3ppm INL, No Missing Codes
10ppm Full-Scale Error and 1ppm Offset
0.56ppm Noise, 20.8 ENOBS
No Latency: Digital Filter Settles in a Single Cycle. Each Conversion Is Accurate, Even After an Input Step
Single Supply 2.7V to 5.5V Operation
Internal Oscillator - No External Components Required
110dB Min, 50Hz/60Hz Notch Filter
Pin Compatible with 24-Bit LTC2410/LTC2411

Applications
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gauge Transducers
Instrumentation
Data Acquisition
Industrial Process Control
DVMs and Meters