Datasheet

LTC2413
30
sn2413 2413fs
APPLICATIO S I FOR ATIO
WUU
U
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-
Figure 28. Offset Error vs Output Data Rate and Temperature
Figure 29. +FS Error vs Output Data Rate and Temperature Figure 30. –FS Error vs Output Data Rate and Temperature
OUTPUT DATA RATE (READINGS/SEC)
0 102030405060708090100
OFFSET ERROR (ppm OF V
REF
)
2413 F28
500
450
400
350
300
250
200
150
100
50
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 (ppm OF V
REF
)
2413 F29
7000
6000
5000
4000
3000
2000
1000
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 (ppm OF V
REF
)
2413 F30
0
–1000
–2000
–3000
–4000
–5000
–6000
–7000
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
ures␣ 28 through 35, inclusive. 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 temperature. In
certain circumstances, a reduction of the differential refer-
ence voltage may be beneficial.