Datasheet Linear Technology LTC2492

Manufacturer	Linear Technology
Series	LTC2492

24-Bit 2-/4-Channel Delta Sigma ADC with Easy Drive Input Current Cancellation

Datasheets

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PDF, 619 Kb, Language: en, File uploaded: Aug 21, 2017, Pages: 38
24-Bit 2-/4-Channel ΔΣ ADC with Easy Drive Input Current Cancellation

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Packaging

	LTC2492CDE#PBF	LTC2492CDE#TRPBF	LTC2492IDE#PBF	LTC2492IDE#TRPBF
N	1	2	3	4
Package	4x3 DFN-14 Package Outline Drawing	4x3 DFN-14 Package Outline Drawing	4x3 DFN-14 Package Outline Drawing	4x3 DFN-14 Package Outline Drawing
Package Code	DE	DE	DE	DE
Package Index	05-08-1708	05-08-1708	05-08-1708	05-08-1708
Pin Count	14	14	14	14

Parametrics

Parameters / Models	LTC2492CDE#PBF	LTC2492CDE#TRPBF	LTC2492IDE#PBF	LTC2492IDE#TRPBF
ADC INL, LSB	33.5	33.5	33.5	33.5
ADCs	1	1	1	1
Architecture	Delta Sigma	Delta Sigma	Delta Sigma	Delta Sigma
Bipolar/Unipolar Input	Unipolar	Unipolar	Unipolar	Unipolar
Bits, bits	24	24	24	24
Number of Channels	4	4	4	4
DNL, LSB	1	1	1	1
Demo Boards	DC1009A-A	DC1009A-A	DC1009A-A	DC1009A-A
Design Tools	Linduino File	Linduino File	Linduino File	Linduino File
Export Control	no	no	no	no
Features	No Latency, Easy Drive, Temp Sensor, 50Hz & 60Hz Rejection	No Latency, Easy Drive, Temp Sensor, 50Hz & 60Hz Rejection	No Latency, Easy Drive, Temp Sensor, 50Hz & 60Hz Rejection	No Latency, Easy Drive, Temp Sensor, 50Hz & 60Hz Rejection
I/O	Serial SPI	Serial SPI	Serial SPI	Serial SPI
INL ppm, ppm	2	2	2	2
Input Drive	Differential, Single-Ended	Differential, Single-Ended	Differential, Single-Ended	Differential, Single-Ended
Input Span	В±VREF/2, 0V to VREF/2 (COM=GND), 0V to VREF (COM=VREF/2)	В±VREF/2, 0V to VREF/2 (COM=GND), 0V to VREF (COM=VREF/2)	В±VREF/2, 0V to VREF/2 (COM=GND), 0V to VREF (COM=VREF/2)	В±VREF/2, 0V to VREF/2 (COM=GND), 0V to VREF (COM=VREF/2)
Internal Reference	no	no	no	no
Operating Temperature Range, °C	0 to 70	0 to 70	-40 to 85	-40 to 85
Power, mW	0.8	0.8	0.8	0.8
Simultaneous	no	no	no	no
Speed, ksps	0.015	0.015	0.015	0.015
Supply Voltage Range	2.7V to 5.5V	2.7V to 5.5V	2.7V to 5.5V	2.7V to 5.5V

Eco Plan

	LTC2492CDE#PBF	LTC2492CDE#TRPBF	LTC2492IDE#PBF	LTC2492IDE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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вЂњEasy DriveвЂќ Delta-Sigma Analog-to-Digital Converters Cancel Input Current Errors &mdash DN368
PDF, 75 Kb, File published: Jun 2, 2005
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вЂњEasy DriveвЂќ Delta-Sigma Analog-to-Digital Converters
Cancel Input Current Errors вЂ“ Design Note 368
Mike Mayes
Introduction
It is now possible to place large RC networks directly in front of high resolution в€†ОЈ analog-to-digital
converters without degrading their DC accuracy
(see Figure 1). The LTC В®248x family of converters
solves this problem with Easy Driveв„ў technology,
a fully passive sampling network that automatically
cancels the differential input current. Easy Drive
technology does not use on-chip buffers, which
compromise performance (see What is Wrong with
On-Chip Buffers?), but instead uses a new architecture
that maintains 0.002% full-scale error with input RC
networks up to 100kО© and 10ОјF. This new technology
offers many advantages over previous generation в€†ОЈ
ADCs: Rail-to-rail common mode input range Direct digitization of high impedance sensors Elimination of sampling spikes seen at the ADC input
pins Simple external lowpass п¬Ѓltering Noise/power reduction Cancellation of external RC settling errors Easy interface to external ampliп¬Ѓers Removal of transmission line effects for remote
sensors
RSOURCE
SENSOR IDIFF = 0
RSOURCE VIN+
CEXT Easy Drive …
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Easy Drive ADCs Simplify Measurement of High Impedance Sensors &mdash DN379
PDF, 146 Kb, File published: Oct 26, 2005
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advertisement Easy Driveв„ў ADCs Simplify Measurement of
High Impedance Sensors вЂ“ Design Note 379
Mark Thoren
Delta-sigma ADCs, with their high accuracy and high noise
immunity, are ideal for directly measuring many types
of sensors. Nevertheless, input sampling currents can
overwhelm high source impedances or low-bandwidth,
micropower signal conditioning circuits. The LTCВ®2484
family of delta sigma converters solves this problem by
balancing the input currents, thus simplifying or eliminating the need for signal conditioning circuits.
A common application for a delta-sigma ADC is thermistor
measurement. Figure 1 shows the LTC2484 connections
for direct measurement of thermistors up to 100kО©. Data
I/O is through a standard SPI interface and the sampling
current in each input is approximately:
вЋ› VREF вЋћ
вЋњвЋќ
вЋџ вЂ“ VCM
V + + VINвЂ“
2 вЋ
, where VCM = IN
1.5Mв„¦
2 …

Articles

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Easy Drive Delta-Sigma ADCs Deliver Powerful Features and Reduce Design Effort &mdash LT Journal
PDF, 346 Kb, File published: Jan 28, 2008
Extract from the document
LINEAR TECHNOLOGY MArch 2007 IN THIS ISSUEвЂ¦
Cover Article
Easy Drive Delta-Sigma ADCs Deliver
Powerful Features and Reduce Design
Effort.1
Mark Thoren Linear Technology in the NewsвЂ¦.2
Design Features
Current Mode Flyback DC/DC Controller
Provides Tremendous Design Flexibility
.8
Arthur Kelley Isolated Forward Controllers Offer
Buck Simplicity and Performance.10
Charles Hawkes and Arthur Kelley Rugged 3.3V RS485/RS422
Transceivers with Integrated
Switchable Termination.14
Steven Tanghe and Ray Schuler Tiny High Efficiency 2A Buck Regulator
Directly Accepts Automotive, Industrial
and Other Wide Ranging Inputs.18
Kevin Huang 36V Dual 1.4A Monolithic
Step-Down Converter has Start-Up
Tracking and Sequencing.21 VOLUME XVII NUMBER 1 Easy Drive Delta-Sigma
ADCs Deliver Powerful
Features and Reduce …

Model Line

Series: LTC2492 (4)

LTC2492CDE#PBF LTC2492CDE#TRPBF LTC2492IDE#PBF LTC2492IDE#TRPBF

Manufacturer's Classification

Data Conversion > Analog-to-Digital Converters (ADC) > Precision ADCs (Fs < 10Msps) > Multi Channel ADCs