參數(shù)資料
型號(hào)： LTC2440CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： ADC
英文描述： 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
中文描述： 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 23/28頁(yè)
文件大?。?/td> 316K
代理商： LTC2440CGN
LTC2440
23
sn2440, 2440fas
Figure 17. Direct Connection to Low Impedance (<350
) Source
is Possible if the Sensor is Located Close to the ADC.
Direct Connection to Low Impedance Sources
If the ADC can be located physically close to the sensor, it
can be directly connected to sensors or other sources with
impedances up to 350
with no other components re-
quired (see Figure 17).
Buffering the LTC2440
Many applications will require buffering, particularly where
high impedance sources are involved or where the device
being measured is located some distance from the
LTC2440. When buffering the LTC2440 a few simple steps
should be followed.
Figure 19 shows a network suitable for coupling the inputs
of a LTC2440 to a LTC2051 chopper-stabilized op amp.
The 3
μ
V offset and low noise of the LTC2051 make it a
good choice for buffering the LTC2440. Many other op
amps will work, with varying performance characteristics.
The LTC2051 is configured to be able to drive the 1
μ
F
capacitors at the inputs of the LTC2440. The 1
μ
F capaci-
tors should be located close to the ADC input pins.
The measured total unadjusted error of Figure 19 is well
within the specifications of the LTC2440 by itself. Most
autozero amplifiers will degrade the overall resolution to
some degree because of the extremely low input noise of
the LTC2440, however the LTC2051 is a good general
purpose buffer. The measured input referred noise of two
LTC2051s buffering both LTC2440 inputs is approxi-
mately double that of the LTC2440 by itself, which reduces
the effective resolution by 1-bit for all oversample ratios.
Adding gain to the LTC2051 will increase gain and offset
errors and will not appreciably increase the overall resolu-
tion, so it has limited benefit.
Procedure For Coupling Any Amplifier to the LTC2440
The LTC2051 is suitable for a wide range of DC and low
frequency measurement applications. If another amplifier
is to be selected, a general procedure for evaluating the
suitability of an amplifier for use with the LTC2440 is
suggested here:
1. Perform a thorough error and noise analysis on the
amplifier and gain setting components to verify that the
amplifier will perform as intended.
2. Measure the large signal response of the overall circuit.
The capacitive load may affect the maximum slew rate of
the amplifier. Verify that the slew rate is adequate for the
APPLICATIU
W
U
U
Longer Connections to Low Impedance Sources
If longer lead lengths are unavoidable, adding an input
capacitor close to the ADC input pins will average the
charging pulses and prevent reflections or ringing (see
Figure 18). Averaging the current pulses results in a DC
input current that should be taken into account. The
resulting 110k
input impedance will result in a gain error
of 0.44% for a 350
bridge (within the full scale specs of
many bridges) and a very low 12.6ppm error for a 2
thermocouple connection.
Figure 18. Input Capacitors Allow Longer Connection Between
the Low Impedance Source and the ADC.
2440 F17
REF
+
REF
–
IN
+
IN
–
LTC2440
1
μ
F
4.5V to 5.5V
2440 F18
1
μ
F
4.5V to 5.5V
REMOTE
THERMOCOUPLE
V
REF
+
V
CC
GND
IN
+
IN
–
LTC2440
1
μ
F
1
μ
F
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2440CGN#PBF 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP 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:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤(pán)（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類(lèi)型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱(chēng):296-25851-6
LTC2440CGN#PBF 制造商:Linear Technology 功能描述:24BIT ADC DELTA SIG HS 16SSOP 制造商:Linear Technology 功能描述:24BIT ADC, DELTA SIG, HS, 16SSOP
LTC2440CGN#TR 功能描述:IC CONV A/D 24-BIT DIFF 16-SSOP RoHS:否 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:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:2 個(gè)單端，單極
LTC2440CGN#TRPBF 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP 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:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:2 個(gè)單端，單極
LTC2440CGNPBF 制造商:Linear Technology 功能描述:ADC,LTC2440C 24bit diff D-S SPI SSOP
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