參數資料
型號： DC1012A-A
廠商： Linear Technology
文件頁數： 19/34頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2499
軟件下載： QuikEval System
設計資源： DC1012A Schematic
DC1012A Design File
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數量： 1
位數： 24
采樣率（每秒）： 7.5
數據接口： I²C，串行
已用 IC / 零件： LTC2499
已供物品： 板
相關產品： LTC2499CUHF#TRPBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499IUHF#TRPBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499IUHF#PBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499CUHF#PBF-ND - IC ADC 24BIT DELTA SIG 38-QFN
LTC2499
2499fd
op amp output enabling stable operation. The LTC6078
can also be biased at supply rails beyond those used by
the LTC2499. This allows the external sensor to swing rail-
to-rail (–0.3V to VCC + 0.3V) without the need of external
level-shift circuitry.
Reference Current
Similar to the analog inputs, the LTC2499 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 k
(if CREF = 100pF up
to 10k will not degrade the performance (see Figures 13
and 14)
).
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 15
and 16)
). If the input common mode voltage is equal to
the reference common mode voltage, a linearity error of
Figure 13. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 14. –FS Error vs RSOURCE at VREF (Small CREF)
Figure 15. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 16. –FS Error vs RSOURCE at VREF (Large CREF)
applications inForMation
RSOURCE ()
0
+FS
ERROR
(ppm)
50
70
90
10k
2499 F13
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
2499 F14
–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
2499 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
2499 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
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