The SINC4 digital filter provides excellent normal mode reject" />
參數(shù)資料
型號： DC1010A-A
廠商： Linear Technology
文件頁數(shù)： 18/32頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2493
軟件下載： QuikEval System
設(shè)計資源： DC1010A Design File
DC1010A Schematic
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 15
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2493
已供物品： 板
相關(guān)產(chǎn)品： LTC2493IDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493CDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493CDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493IDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493
25
2493fd
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
17 and 18). 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.
Figure 16. INL vs Differential Input Voltage and
Reference Source Resistance for CREF > 1F
Figure 18. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Rejection Mode
Figure 17. Input Normal Mode Rejection, Internal
Oscillator and 50Hz Rejection Mode
the reference common mode voltage, a linearity error of
approximately 0.67ppm per 100Ω of reference resistance
results (see Figure 16). 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 100Ω 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 100Ω 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 LTC2493 significantly
simplifies anti-aliasing filter requirements. Additionally,
the input current cancellation feature allows external
lowpass filtering without degrading the DC performance
of the device.
applicaTions inForMaTion
VIN/VREF
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2493 F16
–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)
2493 F17
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)
2493 F18
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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