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CDC2536DB データシート(PDF) 2 Page - Texas Instruments

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部品番号 CDC2536DB
部品情報  3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH 3-STATE OUTPUTS
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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CDC2536DB データシート(HTML) 2 Page - Texas Instruments

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CDC2536
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH 3-STATE OUTPUTS
SCAS377D – APRIL 1994 – REVISED OCTOBER 1998
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
Unlike many products containing PLLs, the CDC2536 does not require external RC networks. The loop filter
for the PLL is included on-chip, minimizing component count, board space, and cost.
Because it is based on PLL circuitry, the CDC2536 requires a stabilization time to achieve phase lock of the
feedback signal to the reference signal. This stabilization time is required following power up and application
of a fixed-frequency, fixed-phase signal at CLKIN, as well as following any changes to the PLL reference or
feedback signals. Such changes occur upon change of SEL, enabling the PLL via TEST, and upon enable of
all outputs via OE.
The CDC2536 is characterized for operation from 0
°C to 70°C.
detailed description of output configurations
The voltage-controlled oscillator (VCO) used in the CDC2536 has a frequency range of 100 MHz to 200 MHz,
twice the operating frequency of the CDC2536 outputs. The output of the VCO is divided by two and by four
to provide reference frequencies with a 50% duty cycle of one-half and one-fourth the VCO frequency. SEL
determines which of the two signals is buffered to each bank of device outputs.
One device output must be externally wired to FBIN to complete the PLL. The VCO operates such that the
frequency of the output matches that of CLKIN. In the case that a VCO/2 output is wired to FBIN, the VCO must
operate at twice the CLKIN frequency resulting in device outputs that operate at either the same or one-half the
CLKIN frequency. If a VCO/4 output is wired to FBIN, the device outputs operate at the same or twice the CLKIN
frequency.
output configuration A
Output configuration A is valid when any output configured as a 1
× frequency output in Table 1 is fed back to
FBIN. The input frequency range for CLKIN is 50 MHz to 100 MHz when using output configuration A. Outputs
configured as 1/2
× outputs operate at half the CLKIN frequency, while outputs configured as 1× outputs operate
at the same frequency as CLKIN.
Table 1. Output Configuration A
INPUT
OUTPUTS
SEL
1/2
×
FREQUENCY
1
×
FREQUENCY
L
None
All
H
1Yn
2Yn
NOTE: n = 1, 2, 3
output configuration B
Output configuration B is valid when any output configured as a 1
× frequency output in Table 2 is fed back to
FBIN. The input frequency range for CLKIN is 25 MHz to 50 MHz when using output configuration B. Outputs
configured as 1
× outputs operate at the CLKIN frequency, while outputs configured as 2× outputs operate at
double the frequency of CLKIN.
Table 2. Output Configuration B
INPUT
OUTPUTS
SEL
1
×
FREQUENCY
2
×
FREQUENCY
H
1Yn
2Yn
L
All
None
NOTE: n = 1, 2, 3


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