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MAX132ENG 18-Bit ADC with Serial Interface MaximIC
Maxim Integrated MaximIC
MAX132ENG Datasheet PDF : 16 Pages
First Prev 11 12 13 14 15 16
±18-Bit ADC with Serial Interface
of the overall accuracy of the current source. The cur-
rent source delivers 2mA, resulting in about 500mV
across the 250resistor—suitable to fit the MAX132’s
±512mV full-scale range. Note that the accuracy of the
reference resistor (0.1%) sets the circuit’s accuracy.
The power consumption of the RTD sensor is small
(0.5mW), minimizing errors caused by self-heating.
Interfacing to a µP Parallel Port
Figure 12 shows a high-level software subroutine for
reading output/status data and writing command data
to the MAX132. It provides an algorithm for serial com-
munication when the µP port does not have a prede-
fined serial interface protocol (i.e., SPI™ or Microwire™).
The routine sends command data (TxByte) to the
MAX132 while concurrently collecting the MAX132’s
output register data (selected by the previous write
cycle). Note that a write is required before each read to
change the next output register to be read, and that
the subroutine must be repeated three times to read
the output status register, Output Register 0, and
Output Register 1.
+5V
IN
0.1µF
IC1
MAX872
4.096V
OUT
GND
SERIAL-
DATA
INTERFACE
2k
CHIP SELECT
DATA IN
DATA OUT
CLOCK
VR
250
0.1%
RTD
PT100
RW1
VS
RW2
-5V
+5V
10µF
10µF
0.1µF
13
24
V-
V+
1 CS
2 DIN
3 DOUT
4 SCLK
11 EOC
7 PG0
8 PG1
9 PG2
10 PG3
IC2
MAX132
BUF OUT 23
INT OUT 22
INT IN 21
CREF+ 19
CREF- 20
REF+ IN 18
REF- IN 17
OSC2 5
600k
4.7nF
0.1µF
14 IN HI
15 IN LO
32,768Hz
OSC1 6
DGND
12
AGND
16
RW1, RW2 WIRE RESISTANCE
Figure 11. Ratiometric Configuration Using the Differential Reference Inputs
SPI is a trademark of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
______________________________________________________________________________________ 15
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