REF+ and REF
參數(shù)資料
型號(hào): DC575A
廠商: Linear Technology
文件頁數(shù): 21/48頁
文件大?。?/td> 0K
描述: BOARD DELTA SIGMA ADC LTC2410
軟件下載: QuikEval System
設(shè)計(jì)資源: DC575A Design File
DC575A Schematic
標(biāo)準(zhǔn)包裝: 1
系列: QuikEval™
ADC 的數(shù)量: 2
位數(shù): 24
采樣率(每秒): 7.5
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
工作溫度: 0°C ~ 70°C
已用 IC / 零件: LTC2410
已供物品:
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LTC2410
28
APPLICATIO S I FOR ATIO
WU
U
REF+ and REFpins and external capacitance CREF con-
nected to these pins are shown in Figures 22, 23, 24
and 25.
In addition to this gain error, the converter INL perfor-
mance is degraded by the reference source impedance.
When FO = LOW (internal oscillator and 60Hz notch), every
100
of source resistance driving REF+ or REFtranslates
into about 1.34ppm additional INL error. When FO = HIGH
(internal oscillator and 50Hz notch), every 100
of source
resistance driving REF+ or REFtranslates into about
1.1ppm additional INL error. When FO is driven by an
external oscillator with a frequency fEOSC, every 100 of
source resistance driving REF+ or REFtranslates into
about 8.73 10–6 fEOSCppm additional INL error.
Figure 26 shows the typical INL error due to the source
resistance driving the REF+ or REFpins when large CREF
values are used. The effect of the source resistance on the
two reference pins is additive with respect to this INL error.
In general, matching of source impedance for the REF+
and REFpins does not help the gain or the INL error. The
user is thus advised to minimize the combined source
impedance driving the REF+ and REFpins rather than to
try to match it.
Figure 22. +FS Error vs RSOURCE at REF+ or REF(Small CIN)
Figure 23. –FS Error vs RSOURCE at REF+ or REF(Small CIN)
Figure 24. +FS Error vs RSOURCE at REF+ and REF(Large CREF)
Figure 25. –FS Error vs RSOURCE at REF+ and REF(Large CREF)
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(ppm
OF
V
REF
)
2410 F22
0
–10
–20
–30
–40
–50
VCC = 5V
REF+ = 5V
REF = GND
IN+ = 5V
IN = 2.5V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ()
1
10
100
1k
10k
100k
FS
ERROR
(ppm
OF
V
REF
)
2410 F23
50
40
30
20
10
0
VCC = 5V
REF+ = 5V
REF = GND
IN+ = GND
IN = 2.5V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ()
0 100 200 300 400 500 600 700 800 900 1000
+
FS
ERROR
(ppm
OF
V
REF
)
2410 F24
0
–90
–180
–270
–360
–450
VCC = 5V
REF+ = 5V
REF= GND
IN+ = 3.75V
IN = 1.25V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.1F
CREF = 1F, 10F
RSOURCE ()
0 100 200 300 400 500 600 700 800 900 1000
FS
ERROR
(ppm
OF
V
REF
)
2410 F25
450
360
270
180
90
0
VCC = 5V
REF+ = 5V
REF= GND
IN+ = 1.25V
IN = 3.75V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.1F
CREF = 1F, 10F
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