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LTC6955 датащи(PDF) 12 Page - Analog Devices

номер детали LTC6955
подробное описание детали  Ultralow Jitter, 7.5GHz 11 Output Fanout Buffer Family
PDF  22 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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LTC6955 датащи(HTML) 12 Page - Analog Devices

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LTC6955
12
Rev 0
For more information www.analog.com
Preliminary Technical Data
Advance Product Information Subject to Change
Rev PrA
OPERATION
Table 2. Output Programming with SELx Pins (Note 3)
SEL
CODE SEL3
SEL2
SEL1
SEL0
# OF
ACTIVE
OUTPUTS
OUT0
OUT1
OUT2
OUT3
OUT4 OUT5
OUT6
OUT7
OUT8
OUT9 OUT10 TEMP
0
0
0
0
0
0
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
1
0
0
0
1
3
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
2
0
0
1
0
4
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
3
0
0
1
1
5
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
4
0
1
0
0
6
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
5
0
1
0
1
7
OFF
OFF
ON
OFF
ON
OFF
ON
INV
ON
INV
ON
ON
6
0
1
1
0
7
OFF
OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
ON
7
0
1
1
1
8
OFF
OFF
ON
OFF
ON
INV
ON
INV
ON
INV
ON
ON
8
1
0
0
0
8
OFF
OFF
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
9
1
0
0
1
9
OFF
OFF
ON
INV
ON
INV
ON
INV
ON
INV
ON
ON
10
1
0
1
0
9
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
11
1
0
1
1
10
OFF
INV
ON
INV
ON
INV
ON
INV
ON
INV
ON
ON
12
1
1
0
0
10
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
13
1
1
0
1
11
ON
INV
ON
INV
ON
INV
ON
INV
ON
INV
ON
ON
14
1
1
1
0
11
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
15
1
1
1
1
0
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
Output Programming
The LTC6955’s eleven outputs can be configured by
setting the state of the four SELx pins. Three to eleven
outputs can be enabled at one time, and odd outputs
have the additional ability to be enabled with their output
inverted. See Table 2 for full programming details, where
OFF means the output is disabled, ON means the output is
enabled and not inverted from the input, and INV means
the output is enabled and inverted from the input.
TEMP Pin
The TEMP pin outputs a temperature measurement diode
voltage when enabled. For an approximate die tempera-
ture, a calibration point is required. Measure the TEMP
pin voltage (VTEMPC) with the LTC6955 powered down
(SEL3 = SEL2 = SEL1 = SEL0 = 1) at a known tempera-
ture (tCAL). Then calculate the operating temperature in a
desired application by measuring the TEMP voltage again
(VTEMP) and using the following equation:
t = 665 • (VTEMPC – VTEMP) + tCAL
where t and tCAL are in °C, and VTEMPC and VTEMP are in V.
The TEMP diode is enabled in all modes except a full
shutdown (SEL3 = SEL2 = SEL1 = SEL0 = 0) as shown
in Table 2.



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