Datasheet

Transfer Functions
Figures 15–18 show the MAX1491/MAX1493s’ transfer
functions. The transfer function for the MAX1493/
MAX1495 with AIN+ - AIN- ≥ 0 and RANGE = GND is:
The transfer function for the MAX1493 with AIN+ - AIN-
< 0 and RANGE = GND is:
The transfer function for the MAX1491 with AIN+ - AIN-
≥ 0 and RANGE = GND is:
The transfer function for the MAX1491 with AIN+ - AIN-
< 0 and RANGE = GND is:
The transfer function for the MAX1493/MAX1495 with
AIN+ - AIN- ≥ 0 and RANGE = DV
DD
is:
The transfer function for the MAX1493 with AIN+ - AIN-
< 0 and RANGE = DV
DD
is:
The transfer function for the MAX1491 with AIN+ - AIN-
≥ 0 and RANGE = DV
DD
is:
The transfer function for the MAX1491 with AIN+ - AIN-
< 0 and RANGE = DV
DD
is:
Counts
VV
VV
AIN AIN
REF REF
=× ×
⎛
⎝
⎜
⎞
⎠
⎟
×+
+
+
1 024 2000 10 1.
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=×
⎛
⎝
⎜
⎞
⎠
⎟
××
+
+
1 024 2000 10.
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=× ×
⎛
⎝
⎜
⎞
⎠
⎟
×+
+
+
1 024 20 000 10 1. ,
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=×
⎛
⎝
⎜
⎞
⎠
⎟
××
+
+
1 024 20 000 10. ,
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=× ×
⎛
⎝
⎜
⎞
⎠
⎟
+
+
+
1 024 2000 1.
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=×
⎛
⎝
⎜
⎞
⎠
⎟
×
+
+
1 024 2000.
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=× ×
⎛
⎝
⎜
⎞
⎠
⎟
+
+
+
1 024 20 000 1. ,
-
-
-
-
Counts
VV
VV
AIN AIN
REF REF
=×
⎛
⎝
⎜
⎞
⎠
⎟
×
+
+
1 024 20 000. ,
-
-
-
-
MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
______________________________________________________________________________________ 19
Figure 15. MAX1493/MAX1495 Transfer Function ±2V Range
-2V
0
ANALOG INPUT VOLTAGE
+2V
LCD
1 - - - -
19,999
2
1
0
- 0
- 1
- 2
-19,999
- 1 - - - -
-100µV
100µV
Figure 16. MAX1493/MAX1495 Transfer Function ±200mV Range
-200mV
0
ANALOG INPUT VOLTAGE
+200mV
LCD
1 - - - -
19,999
2
1
0
- 0
- 1
- 2
-19,999
- 1 - - - -
-10µV
10µV