LTC2445 datasheet(1/28 Pages) LINER

Teilenummer	LTC2445

Bauteilbeschribung	24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution

PDF	28 Pages

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Hersteller	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC2444/LTC2445/

LTC2448/LTC2449

1

sn2444589 2444589fs

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

■ High Speed Multiplexing

■

Weight Scales

■ Auto Ranging 6-Digit DVMs

■ Direct Temperature Measurement

■

High Speed Data Acquisition

■ Up to 8 Differential or 16 Single-Ended Input

Channels

■ Up to 8kHz Output Rate

■ Up to 4kHz Multiplexing Rate

■ Selectable Speed/Resolution

■ 2µVRMS Noise at 1.76kHz Output Rate

■ 200nVRMS Noise at 13.8Hz Output Rate with

Simultaneous 50/60Hz Rejection

■ Guaranteed Modulator Stability and Lock-Up

Immunity for any Input and Reference Conditions

■ 0.0005% INL, No Missing Codes

■ Autosleep Enables 20µA Operation at 6.9Hz

■ <5µV Offset (4.5V < VCC < 5.5V, – 40°C to 85°C)

■ Differential Input and Differential Reference with

GND to VCC Common Mode Range

■ No Latency Mode, Each Conversion is Accurate Even

After a New Channel is Selected

■ Internal Oscillator—No External Components

■ LTC2445/LTC2449 Include MUXOUT/ADCIN for

External Buffering or Gain

■ Tiny QFN 5mm x 7mm Package

24-Bit High Speed

8-/16-Channel ∆Σ ADCs with

Selectable Speed/Resolution

The LTC

®2444/LTC2445/LTC2448/LTC2449 are 8-/16-

channel (4-/8-differential) high speed 24-bit No Latency

∆Σ

TM ADCs. They use a proprietary delta-sigma architec-

ture enabling variable speed/resolution. Through a simple

4-wire serial interface, ten speed/resolution combinations

6.9Hz/280nVRMS to 3.5kHz/25µVRMS (4kHz with external

oscillator) can be selected with no latency between con-

version results or shift in DC accuracy (offset, full-scale,

linearity, drift). Additionally, a 2X speed mode can be

selected enabling output rates up to 7kHz (8kHz if an

external oscillator is used) with one cycle latency.

Any combination of single-ended or differential inputs can

be selected with a common mode input range from ground

to VCC, independent of VREF. While operating in the 1X

speed mode the first conversion following a new speed,

resolution, or channel selection is valid. Since there is no

settling time between conversions, all 8 differential chan-

nels can be scanned at a rate of 500Hz. At the conclusion

of each conversion, the converter is internally reset elimi-

nating any memory effects between successive conver-

sions and assuring stability of the high order delta-sigma

modulator.

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

LTC2444/LTC2448

Speed vs RMS Noise

Simple 24-Bit Variable Speed Data Acquisition System

SDI

SCK

SDO

CS

FO

REF+

VCC

4.5V TO 5.5V

1µF

COM

REF –

GND

THERMOCOUPLE

VARIABLE SPEED/

RESOLUTION

DIFFERENTIAL

24-BIT ∆Σ ADC

16-CHANNEL

MUX

+

–

2444 TA01

4-WIRE

SPI INTERFACE

LTC2448

= EXTERNAL OSCILLATOR

= INTERNAL OSCILLATOR

(SIMULTANEOUS 50Hz/60Hz

REJECTION AT 6.9Hz OUTPUT RATE)

CH0

CH1

•

CH7

CH8

CH15

CONVERSION RATE (Hz)

1

0.1

1

10

100

10

100

2440 TA02

1000

10000

2.8µV AT 880Hz

280nV AT 6.9Hz

(50/60Hz REJECTION)

VCC = 5V

VREF = 5V

VIN

+ = V

IN

– = 0V

2X SPEED MODE

NO LATENCY MODE

No Latency ∆Σ is a trademark of Linear Technology Corporation.

Ähnliche Beschreibung - LTC2445

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