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| 型号： | DC571A |
| 厂商： | Linear Technology |
| 文件页数： | 37/48页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2418 |
| 软件下载： | QuikEval System |
| 设计资源： | DC571A Design File DC571A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 7.5 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2418 |
| 已供物品： | 板 |
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LTC2414/LTC2418
42
241418fa
APPLICATIO S I FOR ATIO
WU
UU
20
18
17
16
19
SDI
SCK
SDO
CS
FO
REF+
REF–
CH0
CH1
CH2
CH3
CH14
CH15
11
12
21
22
23
24
7
8
GND
VCC
LTC2418
5V
9
15
0.1
F
R1
25k
0.1%
PT2
100
RTD
PT1
100
RTD
PT8
100
RTD
2418 F48
10
F
+
4-WIRE
SPI
Figure 48. Measurement of a Ladder of Sensors Using
Differential Mode
Multichannel Bridge Digitizer and Digital Cold
Junction Compensation
The bridge application as shown in Figures 41, 42, and 43
can be expanded to multiple bridge transducers. Figure 54
shows the expansion for simple bridge measurement.
Also included is the temperature measurement.
In Figure 54, CH0 to CH13 are configured as differential to
measure up to seven bridge transducers using the LTC2418.
CH14 and CH15 are configured as single-ended. CH14
measures the thermocouple while CH15 measures the
output of the cold junction sensor (diode, thermistor,
etc.). The measured cold junction sensor output is then
used to compensate the thermocouple output to find the
absolute temperature. The final temperature value may
then be used to compensate the temperature effects of the
bridge transducers.
Sample Driver for LTC2414/LTC2418 SPI Interface
The LTC2414/LTC2418 have a simple 4-wire serial inter-
face and it is easy to program microprocessors and
microcontrollers to control the device.
Figure 49 shows the 4-wire SPI connection between the
LTC2414/LTC2418 and a PIC16F84 microcontroller. The
sample program for CC5X compiler in Figure 50 can be
used to program the PIC16F84 to control the LTC2414/
LTC2418. It uses PORT B to interface with the device.
The program begins by declaring variables and allocating
four memory locations to store the 32-bit conversion
result. In execution, it first initiates the PORT B to the
proper SPI configuration and prepares channel address.
The LTC2414/LTC2418 is activated by setting the CS low.
Then the microcontroller waits until a logic LOW is de-
tected on the data line, signifying end-of-conversion. After
a LOW is detected, a subroutine is called to exchange data
between the LTC2414/LTC2418 and the microcontroller.
The main loop ends by setting CS high, ending the data
output state.
The performance of the LTC2414/LTC2418 can be verified
using the demonstration board DC434A, see Figure 51 for
the schematic. This circuit uses the computer’s serial port
to generate power and the SPI digital signals necessary for
starting a conversion and reading the result. It includes a
SCK
SDI
SDO
CS
18
20
17
16
8
9
10
11
PIC16F84
LTC2414/
LTC2418
RB2
RB3
RB4
RB5
2414/18 F49
Figure 49. Connecting the LTC2414/LTC2418 to
a PIC16F84 MCU Using the SPI Serial Interface
LabVIEW
TM application software program (see Figure 52)
which graphically captures the conversion results. It can
be used to determine noise performance, stability and with
an external source linearity. As exemplified in the sche-
matic, the LTC2414/LTC2418 is extremely easy to use.
This demonstration board and associated software is
available by contacting Linear Technology.
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