LTC2421 - 1-/2-Channel 20-Bit µPower No Latency Delta Sigma ADCs in MSOP-10

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 defined rejection frequency in the range 1Hz to 120Hz. The internal oscillator requires no external frequency setting components.

These converters accept an external reference voltage from 0.1V to VCC. With an extended input conversion range of –12.5% VREF to 112.5% VREF (VREF = FSSET – ZSSET), the LTC2421/LTC2422 smoothly resolve the offset and overrange problems of preceding sensors or signal conditioning circuits.

The LTC2421/LTC2422 communicate through a 2- or 3-wire digital interface that is compatible with SPI and MICROWIRE™ protocols.

Features

20-Bit ADCs in Tiny MSOP-10 Packages
1- or 2-Channel Inputs
Single Supply 2.7V to 5.5V Operation
Low Supply Current (200µA) and Auto Shutdown
Automatic Channel Selection (Ping-Pong) (LTC2422)
No Latency: Digital Filter Settles in a Single Conversion Cycle
8ppm INL, No Missing Codes
4ppm Full-Scale Error
0.5ppm Offset
1.2ppm Noise
Zero Scale and Full Scale Set for Reference and Ground Sensing
Internal Oscillator—No External Components Required
110dB Min, 50Hz/60Hz Notch Filter
Reference Input Voltage: 0.1V to VCC
Live Zero—Extended Input Range Accommodates 12.5% Overrange and Underrange
Pin Compatible with LTC2401/LTC2402

Typical Application

Applications

Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gauge Transducers
Instrumentation
Data Acquisition
Industrial Process Control

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC2421CMS#PBF	MS-10	C	$5.40	$4.35
LTC2421CMS#TRPBF	MS-10	C		$4.41
LTC2421IMS#PBF	MS-10	I	$6.10	$4.90
LTC2421IMS#TRPBF	MS-10	I		$4.96

Datasheet

LTC2421/LTC2422 - 1-/2-Channel 20-Bit µPower No Latency Delta Sigma ADCs in MSOP-10

Application Note

AN96 - Delta Sigma ADC Bridge Measurement Techniques

Design Note