MAX1492 Datasheet, PDF (31/35 Pages) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
R = 100Ω for ±2V RANGE
10Ω for ±200mV RANGE
4–20mA
0.1µF
R
0.1µF
AIN+
MAX1492
MAX1494
AIN-
±1.8.8.8.8
Figure 23. 4–20mA Measurement
LCD ADC RESULT
1 - - - - >4E1Fh
19,999 4E1Fh
2 0002h
1 0001h
0 0000h
- 0 FFFFh
- 1 FFFEh
- 2 FFFDh
-19,999 B1E0h
- 1 - - - - <B1E0h
-2V
-100µV 0 100µV
+2V
ANALOG INPUT VOLTAGE
Figure 24. MAX1494 Transfer Function, ±2V Range
LCD ADC RESULT
1 - - - - 4E1Fh
19,999 4E1Fh
2 0002h
1 00001h
0 0000h
- 0 FFFFh
- 1 FFFEh
- 2 FFFDh
-19,999 B1E0h
- 1 - - - - <B1E0h
-200mV
-10µV 0 10µV
+200mV
ANALOG INPUT VOLTAGE
Figure 25. MAX1494 Transfer Function ±200mV Range
LCD ADC RESULT
1 - - - 7CFh
1999 7CFh
2 002h
1 001h
0 000h
- 0 FFFh
- 1 FFEh
- 2 FFDh
-1999 830h
- 1 - - - <830h
-200mV
-100µV 0 100µV
+200mV
ANALOG INPUT VOLTAGE
Figure 26. MAX1492 Transfer Function ±200mV Range
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