参数资料
型号: DC575A
厂商: Linear Technology
文件页数: 18/48页
文件大小: 0K
描述: BOARD DELTA SIGMA ADC LTC2410
软件下载: QuikEval System
设计资源: DC575A Design File
DC575A Schematic
标准包装: 1
系列: QuikEval™
ADC 的数量: 2
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: LTC2410
已供物品:
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LTC2410
25
APPLICATIO S I FOR ATIO
WU
U
The effect of this input dynamic current can be analyzed
using the test circuit of Figure 16. The CPAR capacitor
includes the LTC2410 pin capacitance (5pF typical) plus
the capacitance of the test fixture used to obtain the results
shown in Figures 17 and 18. A careful implementation can
bring the total input capacitance (CIN + CPAR) closer to 5pF
thus achieving better performance than the one predicted
by Figures 17 and 18. For simplicity, two distinct situa-
tions can be considered.
Figure 15. LTC2410 Equivalent Analog Input Circuit
Figure 16. An RC Network at IN+ and IN
Figure 18. –FS Error vs RSOURCE at IN
+ or IN(Small CIN)
Figure 17. +FS Error vs RSOURCE at IN
+ or IN(Small CIN)
IIN
VV
V
R
IIN
VV
V
R
IREF
VV
V
R
V
VR
IREF
VV
V
R
V
VR
where
AVG
IN
INCM
REFCM
EQ
AVG
IN
INCM
REFCM
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
+
+
() = +
() = +
() =
+
() =
+
+
05
15
05
15
05
2
.
::
.
./
V
REF
V
REF
VIN
IN
V
IN
R
M
INTERNAL OSCILLATOR
Hz Notch F
LOW
R
M
INTERNAL OSCILLATOR
Hz Notch F
HIGH
R
f
EXTERNAL OSCILLATOR
REF
REFCM
IN
INCM
EQ
O
EQ
O
EQ
EOSC
=
+
=
==
()
==
()
=
()
+
2
361
60
432
50
0 555 1012
VREF+
VIN+
VCC
RSW (TYP)
20k
ILEAK
VCC
ILEAK
VCC
RSW (TYP)
20k
CEQ
18pF
(TYP)
RSW (TYP)
20k
ILEAK
IIN+
VIN
IIN
IREF+
IREF
2410 F15
ILEAK
VCC
ILEAK
SWITCHING FREQUENCY
fSW = 76800Hz INTERNAL OSCILLATOR (FO = LOW OR HIGH)
fSW = 0.5 fEOSC EXTERNAL OSCILLATOR
VREF
RSW (TYP)
20k
CIN
2410 F16
VINCM + 0.5VIN
RSOURCE
IN+
LTC2410
CPAR
20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN
CPAR
20pF
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(ppm
OF
V
REF
)
2410 F17
50
40
30
20
10
0
VCC = 5V
REF+ = 5V
REF = GND
IN+ = 5V
IN= 2.5V
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
)
2410 F18
0
–10
–20
–30
–40
–50
VCC = 5V
REF+ = 5V
REF = GND
IN+ = GND
IN= 2.5V
FO = GND
TA = 25°C
CIN = 0.01F
CIN = 0.001F
CIN = 100pF
CIN = 0pF
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