參數(shù)資料
型號(hào)： LTC2431IMS#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 25/40頁(yè)
文件大小： 0K
描述： IC ADC 20BIT DIFFINPUT/REF10MSOP
標(biāo)準(zhǔn)包裝： 50
位數(shù)： 20
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 1mW
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： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 管件
輸入數(shù)目和類型： 1 個(gè)差分，雙極
配用： DC586A-ND - BOARD DELTA SIGMA ADC LTC2431
LTC2430/LTC2431
31
24301f
Traditional high order delta-sigma modulators, while pro-
viding very good linearity and resolution, suffer from
potential instabilities at large input signal levels. The pro-
prietary architecture used for the LTC2430/LTC2431 third
order modulator resolves this problem and guarantees a
predictable stable behavior at input signal levels of up to
150% of full scale. In many industrial applications, it is
not uncommon to have to measure microvolt level sig-
nals superimposed over volt level perturbations and
LTC2430/LTC2431 are eminently suited for such tasks.
When the perturbation is differential, the specification of
interest is the normal mode rejection for large input sig-
nal levels. With a reference voltage VREF = 5V, the
LTC2430/LTC2431 have a full-scale differential input range
of 5V peak-to-peak. Figures 36 and 37 show measure-
ment results for the LTC2430/LTC2431 normal mode re-
jection ratio with a 7.5V peak-to-peak (150% of full scale)
input signal superimposed over the more traditional nor-
mal mode rejection ratio results obtained with a 5V peak-
to-peak (full scale) input signal. It is clear that the LTC2430/
LTC2431 rejection performance is maintained with no
compromises in this extreme situation. When operating
with large input signal levels, the user must observe that
such signals do not violate the device absolute maximum
ratings.
APPLICATIO S I FOR ATIO
WU
UU
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2431 F32
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
Figure 32. Input Normal Mode Rejection
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2431 F33
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
Figure 33. Input Normal Mode Rejection
INPUT FREQUENCY (Hz)
0
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240
NORMAL
MODE
REJECTION
(dB)
2431 F34
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
VIN(P-P) = 5V
FO = GND
TA = 25°C
MEASURED DATA
CALCULATED DATA
Figure 34. Input Normal Mode Rejection vs Input Frequency
Figure 35. Input Normal Mode Rejection vs Input Frequency
INPUT FREQUENCY (Hz)
0
25
50
75
100
125
150
175
200
NORMAL
MODE
REJECTION
(dB)
2431 F35
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
VIN(P-P) = 5V
FO = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
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