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参数资料
| 型号： | DC956A |
| 厂商： | Linear Technology |
| 文件页数： | 18/40页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2485 |
| 软件下载： | QuikEval System |
| 设计资源： | DC956A Design File DC956A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | I²C，串行 |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2485 |
| 已供物品： | 板 |
| 相关产品： | LTC2485CDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#PBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485CDD#PBF-ND - IC ADC 24BIT I2C 10-DFN |
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LTC2485
25
2485fc
APPLICATIONS INFORMATION
In addition to the reference sampling charge, the refer-
ence pins ESD protection diodes have a temperature de-
pendent leakage current. This leakage current, nominally
1nA (±10nA max), results in a small gain error. A 100Ω
source resistance will create a 0.05μV typical and 0.5μV
maximum full-scale error.
Output Data Rate
When using its internal oscillator, the LTC2485 produces up
to 7.5 samples per second (sps) with a notch frequency of
60Hz, 6.25sps with a notch frequency of 50Hz and 6.82sps
with the 50Hz/60Hz rejection mode. The actual output
data rate will depend upon the length of the sleep and
data output phases which are controlled by the user and
which can be made insignicantly short. When operated
Figure 16. +FS Error vs RSOURCE at REF+ or REF– (Small CREF)
Figure 17. –FS Error vs RSOURCE at REF+ or REF– (Small CREF)
Figure 18. +FS Error vs RSOURCE at REF+ or REF– (Large CREF)
Figure 19. –FS Error vs RSOURCE at REF+ or REF– (Large CREF)
Figure 20. INL vs DIFFERENTIAL Input Voltage
and Reference Source Resistance for CREF > 1μF
RSOURCE (Ω)
0
+FS
ERROR
(ppm)
50
70
90
10k
2485 F16
30
10
40
60
80
20
0
–10
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
– = 1.25V
TA = 25°C
CREF = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –30
–10
10
10k
2485 F17
–50
–70
–40
–20
0
–60
–80
–90
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN
+ = 1.25V
VIN
– = 3.75V
TA = 25°C
CREF = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
RSOURCE (Ω)
0
+FS
ERROR
(ppm) 300
400
500
800
2485 F18
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
– = 1.25V
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –200
–100
0
800
2485 F19
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 1.25V
VIN
– = 3.75V
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
VIN/VREF (V)
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2485 F20
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
CREF = 10μF
R = 1k
R = 100Ω
R = 500Ω
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