參數(shù)資料
型號(hào)： LTC2480CMS
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： ADC
英文描述： 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
封裝： PLASTIC, MSOP-10
文件頁(yè)數(shù)： 31/40頁(yè)
文件大?。?/td> 601K
代理商： LTC2480CMS
37
LTC2480
2480fa
APPLICATIO S I FOR ATIO
WU
UU
rejection identical as that for the 1x speed mode. The
averaging operation still keeps the output rate with the
following algorithm:
Result 1 = average (sample 0, sample 1)
Result 2 = average (sample 1, sample 2)
……
Result n = average (sample n – 1, sample n)
The main advantage of the running average is that it
achieves simultaneous 50Hz/60Hz rejection at twice the
effective output rate, as shown in Figure 42. The raw
output data provides a better than 70dB rejection over
48Hz to 62.4Hz, which covers both 50Hz
±2% and 60Hz
±2%. With running average on, the rejection is better than
87dB for both 50Hz
±2% and 60Hz ±2%.
Complete Thermocouple Measurement System with
Cold Junction Compensation
The LTC2480 is ideal for direct digitization of thermocouples
and other low voltage output sensors. The input has a typical
offset error of 500nV (2.5
V max) offset drift of 10nV/°C
and a noise level of 600nVRMS. The input span may be
optimized for various sensors by setting the gain of the
PGA. Using an external 5V reference with a PGA gain of 64
gives a
±78mV input range—perfect for thermocouples.
Figure 44 (last page of this data sheet) is a complete type
K thermocouple meter. The only signal conditioning is a
simple surge protection network. In any thermocouple
meter, the cold junction temperature sensor must be at the
same temperature as the junction between the thermo-
couple materials and the copper printed circuit board
traces. The tiny LTC2480 can be tucked neatly underneath
an Omega MPJ-K-F thermocouple socket ensuring close
thermal coupling.
The LTC2480’s 1.4mV/
°C PTAT circuit measures the cold
junction temperature. Once the thermocouple voltage and
cold junction temperature are known, there are many ways
of calculating the thermocouple temperature including a
straight-line approximation, lookup tables or a polynomial
curve fit. Calibration is performed by applying an accurate
500mV to the ADC input derived from an LT
1236 refer-
ence and measuring the local temperature with an accu-
rate thermometer as shown in Figure 43. In calibration
mode, the up and down buttons are used to adjust the local
temperature reading until it matches an accurate ther-
mometer. Both the voltage and temperature calibration
are easily automated.
The complete microcontroller code for this application is
available on the LTC2480 product webpage at:
http://www.linear.com
It can be used as a template for may different instruments
and it illustrates how to generate calibration coefficients
for the onboard temperature sensor. Extensive comments
detail the operation of the program. The read_LTC2480()
function controls the operation of the LTC2480 and is
listed below for reference.
Figure 43. Calibration Setup
CS
SCK
SDO
SDI
FO
6
9
7
1
10
VCC
5V
LTC2480
REF
GND
IN–
IN+
3
ISOTHERMAL
2
C7
0.1
F
C8
1
F
4
R2
2k
R7
8k
6
2
5
4
R8
1k
5
2480 F43
26.3C
TYPE K
THERMOCOUPLE
JACK
(OMEGA MPJ-K-F)
11
8
GND
IN OUT
G1
NC1M4V0
TRIM
GND
LT1236
+
相關(guān)PDF資料
PDF描述
LTC2480IMS#TR 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
LTC2480IMS 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
LTC2480CMS#TR 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
LTC2480HDD#TRPBF 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
LTC2480HDD#PBF 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2480CMS#PBF 功能描述:IC ADC 16BIT 10-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
LTC2480CMS#PBF 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, MSOP-10
LTC2480CMS#TRPBF 功能描述:IC ADC 16BIT 10-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
LTC2480HDD#PBF 功能描述:IC ADC 16BIT SRL 7.5SPS 10DFN RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
LTC2480HDD#TRPBF 功能描述:IC ADC DELTA SIGMA 16BIT 10DFN RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
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