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參數(shù)資料
| 型號： | LTC2497CUHF#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT W/PGA 38-QFN |
| 標(biāo)準(zhǔn)包裝： | 52 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 7.5 |
| 數(shù)據(jù)接口： | I²C，串行 |
| 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： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 38-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 38-QFN（5x7） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 16 個單端，雙極；8 個差分，雙極 |
| 產(chǎn)品目錄頁面： | 1348 (CN2011-ZH PDF) |
| 配用： | DC1012A-B-ND - BOARD DELTA SIGMA ADC LTC2497 |
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LTC2497
0
2497fa
zero, the common mode input current (IIN+ + IIN–)/2 is
proportional to the difference between the common mode
input voltage (VIN(CM)) and the common mode reference
voltage (VREF(CM)).
In applications where the input common mode voltage is
equal to the reference common mode voltage, as in the
case of a balanced bridge, both the differential and com-
mon mode input current are zero. The accuracy of the
converter is not compromised by settling errors.
In applications where the input common mode voltage is
constant but different from the reference common mode
voltage, the differential input current remains zero while
the common mode input current is proportional to the
difference between VIN(CM) and VREF(CM). For a reference
common mode voltage of 2.5V and an input common
mode of 1.5V, the common mode input current is ap-
proximately 0.74A. This common mode input current
does not degrade the accuracy if the source impedances
tied to IN+ and IN– are matched. Mismatches in source
impedance lead to a fixed offset error but do not effect
the linearity or full-scale reading. A 1% mismatch in a 1k
source resistance leads to a 74V shift in offset voltage.
In applications where the common mode input voltage
varies as a function of the input signal level (single-ended
type sensors), the common mode input current varies
proportionally with input voltage. For the case of balanced
inputimpedances,thecommonmodeinputcurrenteffects
are rejected by the large CMRR of the LTC2497, leading
to little degradation in accuracy. Mismatches in source
impedances lead to gain errors proportional to the dif-
ference between the common mode input and common
mode reference. 1% mismatches in 1k source resistances
lead to gain errors on the order of 15ppm. Based on the
stability of the internal sampling capacitors and the ac-
curacy of the internal oscillator, a one-time calibration will
remove this error.
In addition to the input sampling current, the input ESD
protection diodes have a temperature dependent leakage
current. This current, nominally 1nA (±10nA max), results
in a small offset shift. A 1k source resistance will create a
1V typical and a 10V maximum offset voltage.
Automatic Offset Calibration of External Buffers/
Amplifiers
In addition to the Easy Drive input current cancellation,
the LTC2497 allows an external amplifier to be inserted
between the multiplexer output and the ADC input (see
Figure 10). This is useful in applications where balanced
Figure 10. External Buffers Provide High Impedance Inputs
and Amplifier Offsets are Automatically Cancelled.
–
+
–
+
1/2 LTC6078
1
2
3
5
6
7
∑ ADC
WITH
EASY DRIVE
INPUTS
INPUT
MUX
MUXOUTP
MUXOUTN
17
2497 F10
LTC2497
ANALOG
INPUTS
SCL
SDA
0.1F
1k
0.1F
applicaTions inForMaTion
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