LINEAR TECHNOLOGY - LTC2411 Data Sheet Manual User Guide

LTC2411/LTC2411-1

24-Bit No Latency ∆ΣTM ADC with Differential Input and

Reference in MSOP

FEATURES DESCRIPTIO 24-Bit ADC in an MS10 Package The LTC®2411/LTC2411-1 are 2.7V to 5.5V micropower Low Supply Current (200µA in Conversion Mode 24-bit differential ∆Σ analog-to-digital converters with an and 4µA in Autosleep Mode) integrated oscillator, 2ppm INL and 0.29ppm RMS noise. Differential Input and Differential Reference They use delta-sigma technology and provide single cycle

with GND to VCC Common Mode Range settling time for multiplexed applications. Through a 2ppm INL, No Missing Codes single pin, the LTC2411 can be configured for better than 4ppm Full-Scale Error and 1ppm Offset 110d B differential mode rejection at 50Hz or 60Hz ±2%, 0.29ppm Noise and the LTC2411-1 can provide better than 87d B input No Latency: Digital Filter Settles in a Single Cycle. differential mode rejection over the range of 49Hz to Each Conversion Is Accurate, Even After an 61.2Hz, or they can be driven by an external oscillator for Input Step a user-defined rejection frequency. The LTC2411 and Single Supply 2.7V to 5.5V Operation LTC2411-1 are identical when driven by an external Internal Oscillator—No External Components oscillator. The internal oscillator requires no external Required frequency setting components.

110d B Min, Pin Selectable 50Hz/60Hz Notch Filter

The converters accept any external differential reference

(LTC2411)

voltage from 0.1V to VCC for flexible ratiometric and

Simultaneous 50Hz/60Hz Rejection (LTC2411-1)

remote sensing measurement configurations. The full- scale differential input range is from –0.5VREF to 0.5VREF.

APPLICATIO S The reference common mode voltage, VREFCM, and the

input common mode voltage, VINCM, may be indepen-

Direct Sensor Digitizer

dently set anywhere within the GND to VCC range of the

Weight Scales

LTC2411/LTC2411-1. The DC common mode input rejec-

Direct Temperature Measurement

tion is better than 140d B.

Gas Analyzers

Strain Gauge Transducers The LTC2411/LTC2411-1 communicate through a flexible Instrumentation 3-wire digital interface that is compatible with SPI and Data Acquisition MICROWIRETM protocols. Industrial Process Control , LTC and LT are registered trademarks of Linear Technology Corporation. No Latency ∆Σ is a trademark of Linear Technology Corporation.

6-Digit DVMs MICROWIRE is a trademark of National Semiconductor Corporation.

TYPICAL APPLICATIO

VCC 2.7V TO 5.5V 1µF

1µF = INTERNAL OSC/50Hz REJECTION (LTC2411)

= EXTERNAL CLOCK SOURCE

VCC FO

= INTERNAL OSC/60Hz REJECTION (LTC2411) LTC2411/ = SIMULTANEOUS 50Hz/60Hz REJECTION (LTC2411-1)

LTC2411-1 REF+ VCC SCK

BRIDGE

REFERENCE REF+ IN+ 3-WIRE

SCK IMPEDANCE LTC2411/ SDO

VOLTAGE SPI

100Ω TO 10kΩ IN– LTC2411-1

0.1V TO VCC REF– INTERFACE

3-WIRE

SPI INTERFACE REF GND FO

ANALOG INPUT RANGE IN+ SDO –0.5VREF TO 0.5VREF

IN– CS

GND 2411 TA02

2411 TA01