參數資料
型號: LTC2486IDE#PBF
廠商: Linear Technology
文件頁數: 27/36頁
文件大?。?/td> 0K
描述: IC ADC 16BIT W/PGA 14-DFN
標準包裝: 91
位數: 16
采樣率(每秒): 15
數據接口: MICROWIRE?,串行,SPI?
轉換器數目: 1
功率耗散(最大): 800µW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 14-WFDFN 裸露焊盤
供應商設備封裝: 14-DFN-EP(4x3)
包裝: 管件
輸入數目和類型: 4 個單端,雙極;2 個差分,雙極
產品目錄頁面: 1348 (CN2011-ZH PDF)
配用: DC1009A-C-ND - BOARD DELTA SIGMA ADC LTC2486
LTC2486
33
2486fd
APPLICATIONS INFORMATION
Easy Drive ADCs Simplify Measurement of High
Impedance Sensors
Delta-Sigma ADCs, with their high accuracy and high noise
immunity, are ideal for directly measuring many types
of sensors. Nevertheless, input sampling currents can
overwhelm high source impedances or low-bandwidth,
micropower signal conditioning circuits. The LTC2486
solves this problem by balancing the input currents, thus
simplifying or eliminating the need for signal conditioning
circuits.
A common application for a delta-sigma ADC is thermistor
measurement. Figure 38 shows two examples of thermistor
digitization beneting from the Easy Drive technology.
The rst circuit (applied to input channels CH0 and CH1)
uses balanced reference resistors in order to balance the
common mode input/reference voltage and balance the
differential input source resistance. If reference resistors
R1 and R4 are exactly equal, the input current is zero and
no errors result. If these resistors have a 1% tolerance,
the maximum error in measured resistance is 1.6Ω due
to a shift in common mode voltage; far less than the 1%
error of the reference resistors themselves. No amplier
is required, making this an ideal solution in micropower
applications.
Easy Drive also enables very low power, low bandwidth
ampliers to drive the input to the LTC2486. As shown in
Figure 38, CH2 is driven by the LT1494. The LT1494 has
excellent DC specs for an amplier with 1.5μA supply
current (the maximum offset voltage is 150μV and the
open loop gain is 100,000). Its 2kHz bandwidth makes
it unsuitable for driving conventional delta sigma ADCs.
Adding a 1kΩ, 0.1μF lter solves this problem by providing
a charge reservoir that supplies the LTC2486 instantaneous
current, while the 1k resistor isolates the capacitive load
from the LT1494.
Conventional delta sigma ADCs input sampling current
lead to DC errors as a result of incomplete settling in the
external RC network.
The Easy Drive technology cancels the differential input
current. By balancing the negative input (CH3) with a 1kΩ,
0.1μF network errors due to the common mode input
current are cancelled.
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