Reference Source Resistance for CREF <" />
參數(shù)資料
型號: LTC2499CUHF#PBF
廠商: Linear Technology
文件頁數(shù): 20/34頁
文件大?。?/td> 0K
描述: IC ADC 24BIT DELTA SIG 38-QFN
標準包裝: 52
位數(shù): 24
采樣率(每秒): 7.5
數(shù)據(jù)接口: I²C,串行
轉換器數(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-A-ND - BOARD DELTA SIGMA ADC LTC2499
LTC2499
2499fd
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
approximately 0.67ppm per 100 of reference resistance
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 of reference resistance.
applications inForMation
VIN/VREF
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2499 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)
2499 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)
2499 F19
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
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 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 LTC2499 significantly
simpli-fies 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.
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