LTC2984 datasheet(59/78 Pages) AD

59 / 78 page

LTC2984

2984fb

For more information www.linear.com/LTC2984

APPLICATIONS INFORMATION

Typical Application Thermocouple Measurements

The LTC2984 includes 20 fully configurable analog input

channels. Each input channel can be configured to accept

any sensor type. Figure 34 shows a typical application

digitizing multiple thermocouples. Each thermocouple

requires a cold junction sensor and each cold junction

sensor can be shared amongst multiple thermocouples.

For example, the thermocouple tied to CH1 can use the

diode tied to CH2 as a cold junction sensor. However,

any thermocouple (CH1, CH3, CH5, CH6, CH9, CH10, or

CH16) can use any diode (CH2, CH4, or CH7), RTD (CH13,

CH14), or Thermistor (CH19, CH20) as its cold junction

compensation. The LTC2984 simultaneously measures

both the thermocouple and cold junction sensor and

outputs the results in °C or °F.

Figure 34. Typical Thermocouple Application

CH2

CH3

CH4

CH5

CH6

CH7

CH8

CH9

CH11

CH12

CH13

CH14

CH15

CH10

CH1

VDD

SDI

SDO

SCK

VREFOUT

VREFP

2, 4, 6, 8, 45

2.85V TO 5.25V

2984 F34

CH16

CH17

CH18

CH19

CH20

COM

0.1µF

10µF

1µF

VREF_BYP

1µF

LDO

10µF

(OPTIONAL, DRIVE

LOW TO RESET)

SPI INTERFACE

1, 3, 5, 7, 9, 12, 15, 44

RESET

INTERRUPT

GND

RSENSE

4-WIRE

RTD

LTC2984 Datasheet(PDF) 59 Page - Analog Devices

LTC2984 Datasheet(HTML) 59 Page - Analog Devices

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