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LTC2485CDD датащи(PDF) 25 Page - Linear Technology

номер детали LTC2485CDD
подробное описание детали  24-Bit ?誇 ADC with Easy Drive Input Current Cancellation and I2C Interface
PDF  40 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
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LTC2485CDD датащи(HTML) 25 Page - Linear Technology

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LTC2485
2485fa
current. This leakage current, nominally 1nA (
±10nA max),
results in a small gain error. A 100
Ω source resistance will
create a 0.05
µV 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 insignificantly short. When oper-
ated with an external conversion clock (CA0/F0 connected
to an external oscillator), the LTC2485 output data rate can
be increased as desired. The duration of the conversion
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 17. –FS Error vs RSOURCE at REF+ or REF– (Small CREF)
Figure 16. +FS Error vs RSOURCE at REF+ or REF– (Small CREF)
Figure 20. INL vs DIFFERENTIAL Input Voltage and Reference
Source Resistance for CREF > 1µF
RSOURCE (Ω)
0
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
–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
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
–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
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 = 100
Ω
R = 500
Ω
APPLICATIO S I FOR ATIO



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