LTC2485 datasheet, PDF - EEWORLD Datasheet

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LTC2485: Description24-Bit ツヒ ADC with Easy Drive Input Current Cancellation and I2C Interface; File Size463KB，40 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC2485 Overview

24-Bit ツヒ ADC with Easy Drive Input Current Cancellation and I2C Interface

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LTC2485

24-Bit

∆Σ

ADC with Easy Drive

Input Current Cancellation and I

C Interface

FEATURES

■

DESCRIPTIO

Easy Drive

Technology Enables Rail-to-Rail

Inputs with Zero Differential Input Current

Directly Digitizes High Impedance Sensors with

Full Accuracy

Integrated Temperature Sensor

GND to V

Input/Reference Common Mode Range

2-Wire I

C Interface

Programmable 50Hz, 60Hz or Simultaneous

50Hz/60Hz Rejection Mode

2ppm (0.25LSB) INL, No Missing Codes

1ppm Offset and 15ppm Full-Scale Error

Selectable 2x Speed Mode

No Latency: Digital Filter Settles in a Single Cycle

Single Supply 2.7V to 5.5V Operation

Internal Oscillator

Six Addresses Available and One Global Address for

Synchronization

Available in a Tiny (3mm

3mm) 10-Lead

DFN Package

The LTC

2485 combines a 24-bit plus sign No Latency

∆Σ

analog-to-digital converter with patented Easy Drive tech-

nology and I

C digital interface. The patented sampling

scheme eliminates dynamic input current errors and the

shortcomings of on-chip buffering through automatic

cancellation of differential input current. This allows large

external source impedances and input signals, with rail-to-

rail input range to be directly digitized while maintaining

exceptional DC accuracy.

The LTC2485 includes on-chip temperature sensor and an

oscillator. The LTC2485 can be configured through an I

interface to measure an external signal or internal tem-

perature sensor and reject line frequencies. 50Hz, 60Hz or

simultaneous 50Hz/60Hz line frequency rejection can be

selected as well as a 2x speed-up mode.

The LTC2485 allows a wide common mode input range

(0V to V

) independent of the reference voltage. The

reference can be as low as 100mV or can be tied directly

to V

. The LTC2485 includes an on-chip trimmed oscil-

lator eliminating the need for external crystals or oscilla-

tors. Absolute accuracy and low drift are automatically

maintained through continuous, transparent, offset and

full-scale calibration.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

No Latency

∆Σ

and Easy Drive are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

APPLICATIO S

■

Direct Sensor Digitizer

Weight Scales

Direct Temperature Measurement

Strain Gauge Transducers

Instrumentation

Industrial Process Control

DVMs and Meters

TYPICAL APPLICATIO

+FS Error vs R

SOURCE

at IN

and IN

–

= 5V

REF

= 5V

IN+

= 3.75V

–

40 V

= 1.25V

= GND

20 T

= 25°C

= 1µF

–20

–40

10k

SENSE

10k

DIFF

= 0

1µF

IN+

IN–

REF

LTC2485

GND

SCL

SDA

CA0/F

CA1

2485 TA01

2-WIRE

C INTERFACE

6 ADDRESSES

+FS ERROR (ppm)

1µF

REF

–

–60

–80

100

SOURCE

(Ω)

10k

100k

2485 TA02

2485fa

LTC2485 Related Products

	LTC2485	LTC2485CDD
Description	24-Bit ツヒ ADC with Easy Drive Input Current Cancellation and I2C Interface	24-Bit ツヒ ADC with Easy Drive Input Current Cancellation and I2C Interface

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