LTC2422

U U LTC2421/LTC2422 1-/2-Channel 20-Bit µPower No Latency ∆ΣTMADCs in MSOP-10 FEATURES DESCRIPTIO s 20-Bit ADCs in Tiny MSOP-10 Packages s 1- or 2-Channel Inputs s Single Supply 2.7V to 5.5V Operation s Low Supply Current (200µA) and Auto Shutdown s Automatic Channel Selection (Ping-Pong) (LTC2422) s No Latency: Digital Filter Settles in a Single Conversion Cycle s 8ppm INL, No Missing Codes s 4ppm Full-Scale Error s 0.5ppm Offset s 1.2ppm Noise s Zero Scale and Full Scale Set for Reference and Ground Sensing s Internal Oscillator—No External Components Required s 110dB Min, 50Hz/60Hz Notch Filter s Reference Input Voltage: 0.1V to VCC s Live Zero—Extended Input Range Accommodates 12.5% Overrange and Underrange s Pin Compatible with LTC2401/LTC2402 U APPLICATIO S s Weight Scales s Direct Temperature Measurement s Gas Analyzers s Strain Gauge Transducers s Instrumentation s Data Acquisition s Industrial Process Control The LTC®2421/LTC2422 are 1- and 2-channel 2.7V to 5.5V micropower 20-bit analog-to-digital converters with an integrated oscillator, 8ppm INL and 1.2ppm RMS noise. These ultrasmall devices use delta-sigma technology and a new digital filter architecture that settles in a single cycle. This eliminates the latency found in conventional ∆Σ converters and simplifies multiplexed applications. Through a single pin, the LTC2421/LTC2422 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or can be driven by an external oscillator for a user defin...