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參數(shù)資料
| 型號(hào)： | LTC2480CDD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-Bit ADC with Easy Drive |
| 中文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 31/40頁 |
| 文件大?。?/td> | 535K |
| 代理商： | LTC2480CDD |
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31
LTC2480
2480f
external oscillator), the LTC2480 output data rate can be
increased as desired. The duration of the conversion
phase is 41036/f
EOSC
. If f
EOSC
= 307.2kHz, the converter
behaves as if the internal oscillator is used and the notch
is set at 60Hz.
An increase in f
EOSC
over the nominal 307.2kHz will
translate into a proportional increase in the maximum
output data rate. The increase in output rate is neverthe-
less accompanied by three potential effects, which must
be carefully considered.
First, a change in f
EOSC
will result in a proportional change
in the internal notch position and in a reduction of the
converter differential mode rejection at the power line
frequency. In many applications, the subsequent perfor-
mance degradation can be substantially reduced by rely-
ing upon the LTC2480’s exceptional common mode rejec-
tion and by carefully eliminating common mode to differ-
ential mode conversion sources in the input circuit. The
user should avoid single-ended input filters and should
maintain a very high degree of matching and symmetry in
the circuits driving the IN
+
and IN
–
pins.
Second, the increase in clock frequency will increase
proportionally the amount of sampling charge transferred
through the input and the reference pins. If large external
input and/or reference capacitors (C
IN
, C
REF
) are used, the
previous section provides formulae for evaluating the
effect of the source resistance upon the converter perfor-
mance for any value of f
EOSC
. If small external input and/or
reference capacitors (C
IN
, C
REF
) are used, the effect of the
external source resistance upon the LTC2480 typical
performance can be inferred from Figures 13, 14, 15 and
16 in which the horizontal axis is scaled by 307200/f
EOSC
.
Third, an increase in the frequency of the external oscilla-
tor above 1MHz (a more than 3
×
increase in the output data
rate) will start to decrease the effectiveness of the internal
autocalibration circuits. This will result in a progressive
degradation in the converter accuracy and linearity. Typi-
cal measured performance curves for output data rates up
to 100 readings per second are shown in Figures 20 to 27.
In order to obtain the highest possible level of accuracy from
this converter at output data rates above 20 readings per
second, the user is advised to maximize the power supply
voltage used and to limit the maximum ambient operating
APPLICATIU
W
U
U
Figure 20. Offset Error vs Output Data Rate and Temperature
Figure 21. +FS Error vs Output Data Rate and Temperature
Figure 22. –FS Error vs Output Data Rate and Temperature
OUTPUT DATA RATE (READINGS/SEC)
–10
O
R
)
10
30
50
0
20
40
20
40
60
80
2480 F20
100
10
0
30
50
70
90
V
IN(CM)
= V
V
CC
REF
= 5V
V
IN
= 0V
F
O
= EXT CLOCK
T
A
= 85
°
C
T
A
= 25
°
C
OUTPUT DATA RATE (READINGS/SEC)
0
0
+
R
)
500
1500
2000
2500
3500
10
50
70
2480 F21
1000
3000
40
90 100
20 30
60
80
V
IN(CM)
= V
V
CC
REF
= 5V
F
O
= EXT CLOCK
T
A
= 85
°
C
T
A
= 25
°
C
OUTPUT DATA RATE (READINGS/SEC)
0
–3500
–
R
)
–3000
–2000
–1500
–1000
0
10
50
70
2480 F22
–2500
–500
40
90 100
20 30
60
80
V
IN(CM)
= V
V
CC
= 5V
F
O
= EXT CLOCK
T
A
= 85
°
C
T
A
= 25
°
C
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