參數(shù)資料
型號(hào)： LTC1291DIN8
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： Single Chip 12-Bit Data Acquisition System
中文描述： 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 376K
代理商： LTC1291DIN8
10
LTC1291
Table 1. Microprocessor with Hardware Serial Interfaces
Compatible with the LTC1291**
PART NUMBER
Motorola
MC6805S2, S3
MC68HC11
MC68HC05
RCA
CDP68HC05
Hitachi
HD6305
HD6301
HD63701
HD6303
HD64180
National Semiconductor
COP400 Family
COP800 Family
NS8050U
HPC16000 Family
Texas Instruments
TMS7002
TMS7042
TMS70C02
TMS70C42
TMS32011*
TMS32020*
TMS370C050
* Requires external hardware
**Contact factory for interface information for processors not on this list
MICROWIRE and MICROWIRE/PLUS are trademarks of National
Semiconductor Corp.
TYPE OF INTERFACE
SPI
SPI
SPI
SPI
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
MICROWIRE
MCROWIRE/PLUS
MICROWIRE/PLUS
MICROWIRE/PLUS
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
SPI
Unipolar Transfer Curve
0
1
V
R
–
V
R
–
V
R
V
IN
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
1291 AI05b
Output Code
The LTC1291 performs a unipolar conversion. The follow-
ing shows the output code and transfer curve:
OUTPUT CODE
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
1LSB
0V
INPUT VOLTAGE
(V
REF
= 5V)
4.9988V
4.9976V
0.0012V
0V
1291 AI05a
Unipolar Output Code
Microprocessor Interfaces
The LTC1291 can interface directly (without external hard-
ware) to most popular microprocessors’s (MPU) synchro-
nous serial formats (see Table 1). If an MPU without a
dedicated serial port is used, then three of the MPU’s
parallel port lines can be programmed to form the serial
link to the LTC1291. Included here are one serial interface
example and one example showing a parallel port pro-
grammed to form the serial interface.
Motorola SPI (MC68HC11)
The MC68HC11 has been chosen as an example of an MPU
with a dedicated serial port. This MPU transfers data MSB
-first and in 8-bit increments. The D
IN
word sent to the data
register starts the SPI process. With three 8-bit transfers,
the A/D result is read into the MPU. The second 8-bit
transfer clocks B11 through B8 of the A/D conversion
result into the processor. The third 8-bit transfer clocks the
remaining bits, B7 through B0, into the MPU. The data is
right justified in the two memory locations. ANDing the
second byte with 0D
HEX
clears the four most significant
bits. This operation was not included in the code. It can be
inserted in the data gathering loop or outside the loop
when the data is processed.
U
S
A
O
PPLICATI
IU
U
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