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| 型号： | DC571A |
| 厂商： | Linear Technology |
| 文件页数： | 20/48页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2418 |
| 软件下载： | QuikEval System |
| 设计资源： | DC571A Design File DC571A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 7.5 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2418 |
| 已供物品： | 板 |
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LTC2414/LTC2418
27
241418fa
CIN
2414/18 F12
VINCM + 0.5VIN
RSOURCE
IN+
LTC2414/
LTC2418
CPAR
20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN –
CPAR
20pF
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(ppm
OF
V
REF
)
2414/18 F13
50
40
30
20
10
0
VCC = 5V
REF+ = 5V
REF – = GND
IN+ = 3.75V
IN– = 1.25V
FO = GND
TA = 25°C
CIN = 0.01F
CIN = 0.001F
CIN = 100pF
CIN = 0pF
RSOURCE ()
1
10
100
1k
10k
100k
–
FS
ERROR
(ppm
OF
V
REF
)
2414/18 F14
0
–10
–20
–30
–40
–50
VCC = 5V
REF+ = 5V
REF – = GND
IN+ = 1.25V
IN– = 3.75V
FO = GND
TA = 25°C
CIN = 0.01F
CIN = 0.001F
CIN = 100pF
CIN = 0pF
Figure 12. An RC Network at IN+ and IN–
Figure 13. +FS Error vs RSOURCE at IN+ or IN– (Small CIN)
Figure 14. –FS Error vs RSOURCE at IN+ or IN– (Small CIN)
APPLICATIO S I FOR ATIO
WU
UU
typical differential input resistance is 1.8M
which will
generate a gain error of approximately 0.28ppm for each
ohm of source resistance driving IN+ or IN–. When FO =
HIGH (internal oscillator and 50Hz notch), the typical
differential input resistance is 2.16M
whichwillgenerate
a gain error of approximately 0.23ppm for each ohm of
source resistance driving IN+ or IN–. When FO is driven by
an external oscillator with a frequency fEOSC (external
conversion clock operation), the typical differential input
resistance is 0.28 1012/fEOSC and each ohm of
source resistance driving IN+ or IN – will result in
1.78 10–6 fEOSCppm gain error. The effect of the source
resistance on the two input pins is additive with respect to
this gain error. The typical +FS and –FS errors as a function
of the sum of the source resistance seen by IN+ and IN– for
large values of CIN are shown in Figures 15 and 16.
In addition to this gain error, an offset error term may also
appear. The offset error is proportional with the mismatch
between the source impedance driving the two input pins
IN+ and IN– and with the difference between the input and
reference common mode voltages. While the input drive
circuit nonzero source impedance combined with the
converter average input current will not degrade the INL
performance, indirect distortion may result from the modu-
lation of the offset error by the common mode component
of the input signal. Thus, when using large CIN capacitor
values, it is advisable to carefully match the source imped-
ance seen by the IN+ and IN– pins. When FO = LOW (internal
oscillator and 60Hz notch), every 1
mismatch in source
impedance transforms a full-scale common mode input
signal into a differential mode input signal of 0.28ppm.
When FO = HIGH (internal oscillator and 50Hz notch), every
1
mismatch in source impedance transforms a full-scale
common mode input signal into a differential mode input
signal of 0.23ppm. When FO is driven by an external
oscillator with a frequency fEOSC, every 1 mismatch in
source impedance transforms a full-scale common
mode input signal into a differential mode input signal of
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