Datasheet

LTC2436-1
25
24361f
Figure 24. Offset Error vs Output Data Rate and Temperature
Figure 25. +FS Error vs Output Data Rate and Temperature
Figure 26. –FS Error vs Output Data Rate and Temperature
Figure 27. Resolution (Noise
RMS
1LSB)
vs Output Data Rate and Temperature
APPLICATIO S I FOR ATIO
WUUU
OUTPUT DATA RATE (READINGS/SEC)
0 102030405060708090100
OFFSET ERROR (LSB)
24361 F24
30
15
0
T
A
= 85°C
V
CC
= 5V
REF
+
= 5V
REF
= GND
V
INCM
= 2.5V
V
IN
= 0V
F
O
= EXTERNAL OSCILLATOR
T
A
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
0 102030405060708090100
+FS ERROR (LSB)
24361 F25
420
360
300
240
180
120
60
0
T
A
= 85°C
V
CC
= 5V
REF
+
= 5V
REF
= GND
IN
+
= 3.75V
IN
= 1.25V
F
O
= EXTERNAL OSCILLATOR
T
A
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
0 102030405060708090100
–FS ERROR (LSB)
24361 F26
0
60
120
180
240
300
360
420
T
A
= 85°C
V
CC
= 5V
REF
+
= 5V
REF
= GND
IN
+
= 1.25V
IN
= 3.75V
F
O
= EXTERNAL OSCILLATOR
T
A
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
0 102030405060708090100
RESOLUTION (BITS)
24361 F27
17
16
15
14
13
12
T
A
= 85°C
V
CC
= 5V
REF
+
= 5V
REF
= GND
V
INCM
= 2.5V
V
IN
= 0V
F
O
= EXTERNAL OSCILLATOR
RESOLUTION = LOG
2
(V
REF
/NOISE
RMS
)
T
A
= 25°C
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 LTC2436-1 typical
performance can be inferred from Figures 14, 15, 19 and
20 in which the horizontal axis is scaled by 139,800/f
EOSC
.
Third, an increase in the frequency of the external oscilla-
tor above 460800Hz (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 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