ltc2484 Linear Technology Corporation, ltc2484 Datasheet

ltc2484

Manufacturer Part Number

ltc2484

Description

24-bit Delta Sigma Adc With Easy Drive Input Current Cancellation

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC2484.pdf (40 pages)

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FEATURES

TYPICAL APPLICATIO

■

APPLICATIO S

■

Easy Drive Technology Enables Rail-to-Rail Inputs

with Zero Differential Input Current

Directly Digitizes High Impedance Sensors with

Full Accuracy

600nV RMS Noise

Integrated Temperature Sensor

GND to V

Programmable 50Hz, 60Hz or Simultaneous

50Hz/60Hz Rejection Mode

2ppm INL, No Missing Codes

1ppm Offset and 15ppm Total Unadjusted Error

Selectable 2x Speed Mode (15Hz Using Internal

Oscillator)

No Latency: Digital Filter Settles in a Single Cycle

Single Supply 2.7V to 5.5V Operation

Internal Oscillator

Available in a Tiny (3mm × 3mm) 10-Lead

DFN Package

Direct Sensor Digitizer

Weight Scales

Direct Temperature Measurement

Strain Gauge Transducers

Instrumentation

Industrial Process Control

DVMs and Meters

SENSE

10k

Input/Reference Common Mode Range

DIFF

1µF

= 0

–

GND

LTC2484

REF

2484 TA01

SDI

SDO

SCK

1µF

Easy Drive Input Current Cancellation

4-WIRE

SPI INTERFACE

DESCRIPTIO

The LTC

to-digital converter with patented Easy Drive™ technol-

ogy. 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 LTC2484 includes an on-chip temperature sensor and

oscillator. The LTC2484 can be configured to measure an

external signal or internal temperature 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 LTC2484 allows a wide common mode input range

(0V to V

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

to V

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.

No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners. Patent pending.

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

. The LTC2484 includes an on-chip trimmed oscil-

2484 combines a 24-bit No Latency ∆Σ™ analog-

–20

–40

–80

–60

) independent of the reference voltage. The

+FS Error vs R

REF

= GND

= 25°C

–

= 5V

= 3.75V

= 1.25V

= 5V

24-Bit ∆Σ ADC with

100

SOURCE

(Ω)

= 1µF

at IN

10k

and IN

2484 TA02

100k

LTC2484

–

2484fa

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