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LTC2480 Datasheet(PDF) 31 Page - Linear Technology

Part # LTC2480
Description  16-Bit ?誇 ADC with Easy Drive Input Current Cancellation
Download  42 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2480 Datasheet(HTML) 31 Page - Linear Technology

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LTC2480
31
2480fc
APPLICATIONS INFORMATION
VREF translates into about 2.18 • 10–6 • fEOSCppm addi-
tional INL error. Figure 19 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.
In applications where the reference and input common
mode voltages are different, extra errors are introduced.
For every 1V of the reference and input common mode
voltage difference (VREFCM – VINCM) and a 5V reference,
each Ohm of reference source resistance introduces an
extra (VREFCM – VINCM)/(VREF • REQ) full-scale gain error,
which is 0.074ppm when using internal oscillator and 60Hz
mode. When using internal oscillator and 50Hz/60Hz mode,
the extra full-scale gain error is 0.067ppm. When using
RSOURCE (Ω)
0
50
70
90
10k
2480 F15
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
Figure 15. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 16. –FS Error vs RSOURCE at VREF (Small CREF)
Figure 17. +FS Error vs RSOURCE at VREF (Large CREF)
RSOURCE (Ω)
0
–30
–10
10
10k
2480 F16
–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
RSOURCE (Ω)
0
300
400
500
800
2480 F17
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
Figure 18. –FS Error vs RSOURCE at VREF (Large CREF)
Figure 19. INL vs Differential Input Voltage and
Reference Source Resistance for CREF > 1μF
RSOURCE (Ω)
0
–200
–100
0
800
2480 F18
–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
VIN/VREF (V)
–0.5
2
6
10
0.3
2480 F19
–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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