Rainbow Electronics MAX1494 - Manual (Page 30)

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
30 ______________________________________________________________________________________
SENSOR
MAX1492
MAX1494
ISOLATION
BARRIER
GND GND
4
SPI
4
SPI
3
SPI
µP/µC DAC
V+ V+
R GAIN
R
OFST
R FDBK
C C
VOLTAGE
REGULATOR
±1.8.8.8.8
R Y
R X
R SENSE
V IN+
V IN-
4–20mA LOOP
INTERFACE
Figure 22. 4–20mA Transmitter
MAX1492
MAX1494
MAX6062
+5V
+2.048V
TEMP
SENSOR
THERMOCOUPLE
JUNCTION
0.1 µF
0.47 µF
SPI
µC
AIN+
AIN-
REF+
REF-
GND
Figure 21. Thermocouple Application with MAX1492/MAX1494
MAX1492
MAX1494
AV DD DV DD
DOUT
DIN
SCLK
4.7 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
ANALOG SUPPLY
FERRITE
BEAD
R REF
R
R
ACTIVE
GAUGE
DUMMY
GAUGE
REF+
REF-
AIN+
AIN-
GND
EOC
CS
4.7 µF
0.1 µF
Figure 20. Strain-Gauge Application with MAX1492/MAX1494