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CD74ACT297 Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce CD74ACT297
Description  DIGITAL PHASE-LOCKED LOOP
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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CD74ACT297
DIGITAL PHASE-LOCKED LOOP
SCHS297D – AUGUST 1998 – REVISED JUNE 2002
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
This device performs the classic first-order phase-locked-loop function without using analog components. The
accuracy of the digital phase-locked loop (DPLL) is not affected by VCC and temperature variations, but depends
solely on accuracies of the K clock (K CLK), increment/decrement clock (I/D CLK), and loop propagation delays.
The I/D clock frequency and the divide-by-N modulos determine the center frequency of the DPLL. The center
frequency is defined by the relationship fc = I/D clock/2N (Hz).
Increment/Decrement
Circuit
Modulo K
Counter
K CLK
I/D CLK
φB
φA2
D/U
ENCTR
φA1
DC
B
A
14 15 1
2
4
6
3
5
9
10
13
7
11
12
J
K
ECPD OUT
XORPD OUT
I/D OUT
Modulo Controls
Figure 1. Simplified Block Diagram


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