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LTC1292BCJ8 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1292BCJ8
Description  Single Chip 12-Bit Data Acquisition Systems
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1292BCJ8 Datasheet(HTML) 9 Page - Linear Technology

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9
LTC1292/LTC1297
12927fb
LTC1292 Operating Sequence
S
APPLICATI
I FOR ATIO
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. A dummy DIN word sent to the
data register starts the SPI process. With two 8-bit transfers,
the A/D result is read into the MPU (Figure 1). For the
LTC1292 the first 8-bit transfer clocks B11 through B8 of
the A/D conversion result into the processor. The second
8-bit transfer clocks the remaining bits B7 through B0 into
Microprocessor Interfaces
The LTC1292/LTC1297 can interface directly (without
external hardware) to most popular microprocessors’
(MPU) synchronous 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 LTC1292/LTC1297. Included here are
one serial interface example and one example showing a
parallel port programmed to form the serial interface.
Figure 1. Data Exchange Between LTC1292 and MC68HC11
CLK
tCYC
CS
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
tCONV
DOUT
Hi-Z
tSMPL
tSMPL
LTC1292/7 AI01
LTC1297 Operating Sequence
CLK
CS
DOUT
MPU
RECEIVED WORD
LTC1292/7 F01
B7
B6
B5
B4
B3
B2
B1
B0
B1
B8
B9
B10
B11
BYTE 2
B10
B9
B8
B11
O
?
?
?
1ST TRANSFER
2ND TRANSFER
BYTE 1
B2
B1
B0
B3
B4
B6
B7
B5
CLK
tCYC
CS
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
tCONV
DOUT
Hi-Z
tSMPL
LTC1292/7 AI02
tsuCS
POWER SHUTDOWN MODE


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