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LTC1272-8CCN 数据表(PDF) 15 Page - Linear Technology

部件名 LTC1272-8CCN
功能描述  12-Bit, 3us, 250kHz Sampling A/D Converter
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1272-8CCN 数据表(HTML) 15 Page - Linear Technology

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LTC1272
S
APPLICATI
I FOR ATIO
OLD DATA
DB7-DB0
NEW DATA
DB11-DB8
TRACK
HOLD
DATA
BUSY
RD
CS
RD
LTC1272 • TA19
t8
t1
t2
t3
tCONV
t11
t9
t8
t9
t5
t1
t4
t5
t10
t3
t7
t3
t7
t12
t12
HBEN
t7
t4
t1
t8
t9
NEW DATA
DB7-DB0
t2
t4
t5
Figure 17. ROM Mode, Two Byte Read Timing Diagram
Table 5. ROM Mode, Two Byte Read Data Bus Status
Data Outputs
D7
D6
D5
D4
D3/11
D2/10
D1/9
D0/8
First Read
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Second Read
Low
Low
Low
Low
DB11
DB10
DB9
DB8
Third Read
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ROM Mode, Two Byte READ
As previously mentioned for a two byte read, only data
outputs D7 . . . D0/8 are used. Conversion is started in the
normal way with a Read operation and the data output
status is the same as the ROM Mode, Parallel Read. See
Figure 17 timing diagram and Table 5 data bus status. Two
more Read operations are required to access the new
conversion result. A delay equal to the LTC1272 conver-
sion time must be allowed between conversion start and
the second data Read operation. The second Read opera-
tion, with HBEN high, disables conversion start and places
the high byte (4 MSBs) on data outputs D3/11 . . . DO18.
A third read operation accesses the low data byte (DB7
. . . DB0) and starts another conversion. The 4 MSB’s
appear on data outputs D11 . . . D8 during all three read
operations above.
Microprocessor Interfacing
The LTC1272 is designed to interface with microproces-
sors as a memory mapped device. The CS and RD control
inputs are common to all peripheral memory interfacing.
The HBEN input serves as a data byte select for 8-bit
processors and is normally connected to the micropro-
cessor address bus.
MC68000 Microprocessor
Figure 18 shows a typical interface for the MC68000. The
LTC1272 is operating in the Slow Memory Mode. Assum-
ing the LTC1272 is located at address C000, then the
following single 16-bit Move instruction both starts a
conversion and reads the conversion result:
Move.W $C000,D0


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