Resistance for CREF <" />
參數(shù)資料
型號: LTC2495CUHF#TRPBF
廠商: Linear Technology
文件頁數(shù): 20/34頁
文件大?。?/td> 0K
描述: IC ADC 16BIT W/PGA 38-QFN
標準包裝: 2,500
位數(shù): 16
采樣率(每秒): 15
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
供應商設(shè)備封裝: 38-QFN(5x7)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 16 個單端,雙極;8 個差分,雙極
配用: DC1012A-C-ND - BOARD DELTA SIGMA ADC LTC2495
LTC2495
2495fd
Figure 17. INL vs Differential Input
Voltage and Reference Source
Resistance for CREF > 1F
Figure 19. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Rejection Mode
Figure 18. Input Normal Mode Rejection, Internal
Oscillator and 50Hz Rejection Mode
results (see Figure 17). In applications where the input
and reference common mode voltages are different, the
errorsincrease.A1Vdifferenceinbetweencommonmode
input and common mode reference results in a 6.7ppm
INL error for every 100
W of reference resistance.
In addition to the reference sampling charge, the reference
ESDprotectiondiodeshaveatemperaturedependentleak-
age current. This leakage current, nominally 1nA (±10nA
max) results in a small gain error. A 100
W reference
resistance will create a 0.5V full-scale error.
Normal Mode Rejection and Anti-Aliasing
One of the advantages delta-sigma ADCs offer over
conventional ADCs is on-chip digital filtering. Combined
with a large oversample ratio, the LTC2495 significantly
simplifies anti-aliasing filter requirements. Additionally,
the input current cancellation feature allows external
lowpass filtering without degrading the DC performance
of the device.
The SINC4 digital filter provides excellent normal mode
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (fS) (see Figures
18 and 19). The modulator sampling frequency is fS =
15,360Hz while operating with its internal oscillator and
fS = fEOSC/20 when operating with an external oscillator
of frequency fEOSC.
applications inForMation
Figure 15. +FS Error vs RSOURCE
at VREF (Large CREF)
Figure 16. –FS Error vs RSOURCE
at VREF (Large CREF)
RSOURCE ( )
0
+FS
ERROR
(ppm) 300
400
500
800
2495 F15
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
fO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
RSOURCE ( )
0
–FS
ERROR
(ppm) –200
–100
0
800
2495 F16
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
fO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
VIN/VREF
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2495 F17
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
CREF = 10F
R = 1k
R = 100
R = 500
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0 fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2495 F18
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2495 F19
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
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