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LTAEZ Datasheet

  • LTAEZ

  • Linear Integrated Systems [Differential Input 16-Bit No Lat...

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  • LINEAR

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LTC2433-1
APPLICATIO S I FOR ATIO
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 LTC2433-1 typical
performance can be inferred from Figures 14, 15, 19 and
20 in which the horizontal axis is scaled by 139,800/f
EOSC
.
8
V
CC
= 5V
V
REF
= 5V
V
INCM
= 2.5V
V
IN
= 0V
F
O
= EXT OSC
T
A
= 85掳C
0
OFFSET ERROR (LSB)
+FS ERROR (LSB)
T
A
= 25掳C
0
鈥?
0
10 20 30 40 50 60 70 80 90 100
OUTPUT DATA RATE (READINGS/SEC)
24331 F24
Figure 24. Offset Error vs Output Data Rate and Temperature
6
T
A
= 25掳C
0
T
A
= 85掳C
鈥?
V
CC
= 5V
V
REF
= 5V
鈥? IN
+
= 1.25V
IN
鈥?/div>
= 3.75V
F
O
= EXT OSC
鈥?
0 10 20 30 40 50 60 70 80 90 100
OUTPUT DATA RATE (READINGS/SEC)
24331 F26
NUMBER OF READINGS (%)
3
鈥揊S ERROR (LSB)
Figure 26. 鈥揊S Error vs Output Data Rate and Temperature
U
Third, an increase in the frequency of the external oscilla-
tor above 460800Hz (a more than 3脳 increase in the output
data rate) will start to decrease the effectiveness of the
internal autocalibration circuits. This will result in a pro-
gressive degradation in the converter accuracy and linear-
ity. Typical measured performance curves for output data
rates up to 100 readings per second are shown in Fig-
ures 24, 25, 26, 27, 28 and 29. In order to obtain the
15
12
9
6
T
A
= 85掳C
3
T
A
= 25掳C
V
CC
= 5V
V
REF
= 5V
IN
+
= 3.75V
IN
鈥?/div>
= 1.25V
F
O
= EXT OSC
鈥?
0
10 20 30 40 50 60 70 80 90 100
OUTPUT DATA RATE (READINGS/SEC)
24331 F25
W
U U
Figure 25. +FS Error vs Output Data Rate and Temperature
50
GAUSSIAN DISTRIBUTION
m = 3.1碌V
蟽
= 1.59碌V
RMS
V
CC
= 5V
V
REF
= 0.1V
V
IN
= 0V
REF
+
= 0.1V
REF
鈥?/div>
= GND
IN
+
= GND
IN
鈥?/div>
= GND
F
O
= 2.048MHz
T
A
= 125掳C
40
30
20
10
0
鈥?
0
1
3
2
OUTPUT CODE
4
5
2433 F27
Figure 27. Noise Histogram (Output Rate = 100Hz,
V
CC
= 5V, V
REF
= 100mV, 125掳C)
24331fa
25

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  • LTAEY
    英文版
    Differential Input 16-Bit No Latency DS ADC
    LINEAR
    LTAEY
  • LTAEZ
    英文版
    Linear Integrated Systems [Differential Input 16-Bit No Lat...
    LINEAR
    LTAEZ

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