Datasheet > LTC2444_15

LTC2444_15

更新时间： 2024-09-24 01:08:43

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
28页	307K
描述
24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution

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中文翻译

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LTC2444_15 数据手册

LTC2444/LTC2445/

LTC2448/LTC2449

24-Bit High Speed

8-/16-Channel ∆Σ ADCs with

Selectable Speed/Resolution

FEATURES

DESCRIPTIO

The LTC^®2444/LTC2445/LTC2448/LTC2449 are 8-/16-

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

∆Σ^TMADCs. 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/280nV_RMSto 3.5kHz/25µV_RMS(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.

■

Up to 8 Differential or 16 Single-Ended Input

Channels

■

Up to 8kHz Output Rate

■

Up to 4kHz Multiplexing Rate

■

Selectable Speed/Resolution

■

2µV_RMSNoise at 1.76kHz Output Rate

■

200nV_RMSNoise 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 < V_CC< 5.5V, –40°C to 85°C)

Any combination of single-ended or differential inputs can

beselectedwithacommonmodeinputrangefromground

to V_CC, independent of V_REF. 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.

■

Differential Input and Differential Reference with

GND to V_CCCommon 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}U^{7mm Package}

APPLICATIO S

■

High Speed Multiplexing

■

Weight Scales

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

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

■

Auto Ranging 6-Digit DVMs

■

Direct Temperature Measurement

■

High Speed Data Acquisition

TYPICAL APPLICATIO

LTC2444/LTC2448

Simple 24-Bit Variable Speed Data Acquisition System

Speed vs RMS Noise

4.5V TO 5.5V

100

= 5V

REF

1µF

–

= V = 0V

REF

2X SPEED MODE

CH0

CH1

= EXTERNAL OSCILLATOR

NO LATENCY MODE

= INTERNAL OSCILLATOR

(SIMULTANEOUS 50Hz/60Hz

REJECTION AT 6.9Hz OUTPUT RATE)

•

2.8µV AT 880Hz

CH7

CH8

SDI

SCK

SDO

16-CHANNEL

MUX

VARIABLE SPEED/

RESOLUTION

DIFFERENTIAL

24-BIT ∆Σ ADC

280nV AT 6.9Hz

(50/60Hz REJECTION)

–

4-WIRE

SPI INTERFACE

THERMOCOUPLE

•

CH15

COM

0.1

–

REF

100

1000

10000

CONVERSION RATE (Hz)

GND

LTC2448

2440 TA02

2444 TA01

2444589fb

12 3 4 5 6 7...28

中文翻译

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与LTC2444_15相关器件

型号	品牌	获取价格	描述	数据表
LTC2444C	Linear	获取价格	24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444CUHF	Linear	获取价格	24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444CUHF#PBF	Linear	获取价格	LTC2444 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolutio
LTC2444CUHF#TRPBF	Linear	获取价格	LTC2444 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolutio
LTC2444I	Linear	获取价格	24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444IUHF	Linear	获取价格	24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444IUHF#PBF	Linear	获取价格	LTC2444 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolutio
LTC2444IUHF#TR	Linear	获取价格	LTC2444 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolutio
LTC2444IUHF#TRPBF	Linear	获取价格	LTC2444 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolutio
LTC2445	ADI	获取价格	具可选速度 / 分辨率的 24 位高速 8 / 16 通道 ΔΣ ADC

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