RSOURCE ( ) 0 +FS ERROR (ppm) 50 70 90 10k 2493 F12 30 10 40 6" />
參數(shù)資料
型號(hào)： DC1010A-A
廠商： Linear Technology
文件頁(yè)數(shù)： 17/32頁(yè)
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2493
軟件下載： QuikEval System
設(shè)計(jì)資源： DC1010A Design File
DC1010A 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）： 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
24
2493fd
RSOURCE ( )
0
+FS
ERROR
(ppm)
50
70
90
10k
2493 F12
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 = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ( )
0
–FS
ERROR
(ppm) –30
–10
10
10k
2493 F13
–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 = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ( )
0
+FS
ERROR
(ppm) 300
400
500
800
2493 F14
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
2493 F15
–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
Reference Current
Similar to the analog inputs, the LTC2493 samples the
differential reference pins (REF+ and REF–) transferring
small amounts of charge to and from these pins, thus
producing a dynamic reference current. If incomplete set-
tling occurs (as a function the reference source resistance
andreferencebypasscapacitance)linearityandgainerrors
are introduced.
Forrelativelysmallvaluesofexternalreferencecapacitance
(CREF< 1nF), the voltage on the sampling capacitor settles
for reference impedances of many kΩ
(if CREF = 100pF
up to 10k will not degrade the performance (see Figures
12 and 13)
).
In cases where large bypass capacitors are required on
the reference inputs (CREF > .01F), full-scale and linear-
ity errors are proportional to the value of the reference
resistance. Every ohm of reference resistance produces
a full-scale error of approximately 0.5ppm
(while operat-
ing in simultaneous 50Hz/60Hz mode (see Figures 14
and 15)
). If the input common mode voltage is equal to
Figure 12. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 13. –FS Error vs RSOURCE at VREF (Small CREF)
Figure 14. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 15. –FS Error vs RSOURCE at VREF (Large CREF)
applicaTions inForMaTion
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