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LTC1296 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC1296
Description  Single Chip 12-Bit Data Acquisition System
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1296 Datasheet(HTML) 13 Page - Linear Technology

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LTC1293/LTC1294/LTC1296
129346fs
MSB-First/LSB-First (MSBF)
The output data of the LTC1293/4/6 is programmed for
MSB-first or LSB-first sequence using the MSB bit. When
the MSBF bit is a logical one, data will appear on the DOUT
line in MSB-first format. Logical zeroes will be filled in
indefinitely following the last data bit to accommodate
longer word lengths required by some microprocessors.
When the MSBF bit is a logical zero, LSB first data will
follow the normal MSB first data on the DOUT line. In the
bipolar mode the sign bit will fill in after the MSB bit for
MSBF = 0 (see Operating Sequence).
Power Shutdowns (PS)
The power shutdown feature of the LTC1293/4/6 is acti-
vated by making the PS bit a logical zero. If CS remains low
after the PS bit has been received, a 12-bit DOUT word with
Example 2: The same conditions as Example 1 except
COM = 1V. The resulting input span is 1V
≤ IN+ ≤ 4V. Note
if IN
+ ≥ 4V the resulting DOUT word is all 1’s. If IN+ ≤ 1V
then the resulting DOUT word is all 0’s.
Example 3: Let VCC = 5V, V
= –5V, REF+ = 4V, REF= 1V
and COM = 1V. Bipolar mode of operation. The resulting
input span is –2V
≤ IN+ ≤ 4V.
For differential input configurations with the same condi-
tions as in the above three examples the resulting input
spans are as follows:
Example 1 (Diff.): IN
≤ IN+ ≤ IN+ 3V.
Example 2 (Diff.): IN
≤ IN+ ≤ IN+ 3V.
Example 3 (Diff.): IN
– 3V ≤ IN+ ≤ IN+ 3V.
S
APPLICATI
I FOR ATIO
Operating Sequence
Example: Differential Inputs (CH4
+, CH5), Unipolar Mode
LTC1293 AI05
MSB-FIRST DATA (MSBF = 0)
MSB-FIRST DATA (MSBF = 1)
tCYC
CS
DIN
DOUT
START
SEL1
UNI
PS
SGL/
DIFF
ODD/
SIGN
MSBF
tCONV
tSMPL
SEL0
HI-Z
FILLED WITH ZEROES
DON'T CARE
CLK
DON'T
CARE
B0
B1
B11
CLK
DON'T
CARE
tCYC
CS
DIN
START
SEL1
UNI
PS
SGL/
DIFF
ODD/
SIGN
MSBF
SEL0
DON'T CARE
DOUT
tCONV
tSMPL
HI-Z
B11
B1 B0 B1
B11
FILLED WITH
ZEROES


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