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参数资料
| 型号： | DC941A |
| 厂商： | Linear Technology |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2482 |
| 软件下载： | QuikEval System |
| 设计资源： | DC941A Design File DC941A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2482 |
| 已供物品： | 板 |
| 相关产品： | LTC2482IDD#TRPBF-ND - IC ADC 16BIT 10-DFN LTC2482CDD#TRPBF-ND - IC ADC 16BIT 10-DFN LTC2482IDD#PBF-ND - IC ADC 16BIT 10-DFN LTC2482CDD#PBF-ND - IC ADC 16BIT 10-DFN |
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LTC2482
24
2482fc
APPLICATIONS INFORMATION
resistance is 1.1MΩ and the resulting full-scale error is
0.46ppm for each ohm of source resistance driving the
VREF pin. When fO is driven by an external oscillator with
a frequency fEOSC (external conversion clock operation),
the typical differential reference resistance is 0.33 1012/
fEOSC ΩandeachohmofsourceresistancedrivingtheVREF
pin will result in 1.53 10–6 fEOSCppm gain error. The typ-
ical +FS and –FS errors for various combinations of source
resistance seen by the VREF pin and external capacitance
connected to that pin are shown in Figures 14-17.
In addition to this gain error, the converter INL performance
is degraded by the reference source impedance. The INL
is caused by the input dependent terms –VIN2/(VREF
REQ) – (0.5 VREF DT)/REQ in the reference pin current
as expressed in Figure 10. When using internal oscillator
with 50Hz/60Hz rejection, every 100Ω of reference source
resistance translates into about 0.61ppm additional INL
error. When fO is driven by an external oscillator with a
frequency fEOSC, every 100Ω of source resistance driving
VREF translates into about 1.99 10–6 fEOSCppm addi-
tional INL error. Figure 18 shows the typical INL error due
to the source resistance driving the VREF pin when large
CREF values are used. The user is advised to minimize the
source impedance driving the VREF pin.
RSOURCE (Ω)
0
+FS
ERROR
(ppm)
50
70
90
10k
2482 F14
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 = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –30
–10
10
10k
2482 F15
–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 = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
Figure 14. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 15. –FS Error vs RSOURCE at VREF (Small CREF)
RSOURCE (Ω)
0
+FS
ERROR
(ppm) 300
400
500
800
2482 F16
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
– = 1.25V
fO = GND
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –200
–100
0
800
2482 F17
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 1.25V
VIN
– = 3.75V
fO = GND
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
Figure 16. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 17. –FS Error vs RSOURCE at VREF (Large CREF)
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