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參數(shù)資料
| 型號： | MAX132EWG+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT SERIAL 24-SOIC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1,000 |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 100 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 電壓電源： | 雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個偽差分，雙極 |
MAX132
±18-Bit ADC with Serial Interface
______________________________________________________________________________________
15
MAX132
RW2
RW1
V-
V+
DGND
IN
GND
AGND
RW1, RW2 WIRE RESISTANCE
4.096V
1
13
CS
VS
250
0.1%
2k
600k
0.1
F10F
2
DIN
3
DOUT
4
SCLK
11
EOC
7
PG0
8
PG1
VR
9
PG2
10
PG3
14
IN HI
15
23
24
-5V
+5V
22
21
19
20
18
17
5
6
12
16
IN LO
BUF OUT
INT OUT
OUT
INT IN
4.7nF
32,768Hz
CREF+
CHIP SELECT
DATA IN
DATA OUT
SERIAL-
DATA
INTERFACE
CLOCK
RTD
PT100
CREF-
REF+ IN
REF- IN
OSC2
OSC1
IC2
MAX872
IC1
0.1
F
0.1
F
10
F
+5V
Figure 11. Ratiometric Configuration Using the Differential Reference Inputs
SPI is a trademark of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
of the overall accuracy of the current source. The cur-
rent source delivers 2mA, resulting in about 500mV
across the 250
resistor—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 P 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 P 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.
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