in 1.67 10–6 fEOSC<" />
參數(shù)資料
型號： DC939A
廠商： Linear Technology
文件頁數(shù)： 22/42頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2484
軟件下載： QuikEval System
設(shè)計(jì)資源： DC939A Design File
DC939A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 6.8
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2484
已供物品： 板
相關(guān)產(chǎn)品： LTC2484CDD#TRPBF-ND - IC ADC 24BIT 10-DFN
LTC2484IDD#TRPBF-ND - IC ADC 24BIT 10-DFN
LTC2484IDD#PBF-ND - IC ADC 24BIT 10-DFN
LTC2484CDD#PBF-ND - IC ADC 24BIT 10-DFN
LTC2484
29
2484fd
APPLICATIONS INFORMATION
in 1.67 10–6 fEOSCppm gain error. The typical +FS and
–FS errors for various combinations of source resistance
seen by the VREF pin and external capacitance connected
to that pin are shown in Figures 15-18.
In addition to this gain error, the converter INL per-
formance is degraded by the reference source imped-
ance. The INL is caused by the input dependent terms
–VIN2/(VREF REQ) – (0.5 VREF DT)/REQ in the reference
pin current as expressed in Figure 11. When using internal
oscillator and 60Hz mode, every 100Ω of reference source
resistance translates into about 0.67ppm additional INL
error. When using internal oscillator and 50Hz/60Hz mode,
every 100Ω of reference source resistance translates into
about 0.61ppm additional INL error. When using internal
oscillator and 50Hz mode, every 100Ω of reference source
resistance translates into about 0.56ppm additional INL
error. When fO is driven by an external oscillator with a
frequency fEOSC, every 100Ω of source resistance driving
RSOURCE (Ω)
0
+FS
ERROR
(ppm)
50
70
90
10k
2484 F15
30
10
40
60
80
20
0
–10
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
– = 1.25V
fO = GND
TA = 25°C
CREF = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
Figure 15. +FS Error vs RSOURCE at VREF (Small CREF)
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –30
–10
10
10k
2484 F16
–50
–70
–40
–20
0
–60
–80
–90
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN
+ = 1.25V
VIN
– = 3.75V
fO = GND
TA = 25°C
CREF = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
Figure 16. –FS Error vs RSOURCE at VREF (Small CREF)
RSOURCE (Ω)
0
+FS
ERROR
(ppm) 300
400
500
800
2484 F17
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
– = 1.25V
fO = GND
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
Figure 17. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 18. –FS Error vs RSOURCE at VREF (Large CREF)
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –200
–100
0
800
2484 F18
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 1.25V
VIN
– = 3.75V
fO = GND
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
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