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TLC2942 Datasheet(PDF) 6 Page - Texas Instruments

Part # TLC2942
Description  HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLC2942 Datasheet(HTML) 6 Page - Texas Instruments

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TLC2942
HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PFD output control
A high level on PFD INHIBIT places the PFD OUT in the high-impedance state and the PFD stops phase
detection as shown in Table 4 and Table 5. A high level on PFD INHIBIT also can be used as the power-down
mode for the PFD.
Table 4. PFD1 Inhibit Function
PFD INHIBIT1
DETECTION
PFD OUT1
PFD1 IDD
Low
Active
Active
Normal
High
Stop
Hi-Z
Power Down
Table 5. PFD2 Inhibit Function Table
PFD INHIBIT2
DETECTION
PFD OUT2
PFD2 IDD
Low
Active
Active
Normal
High
Stop
Hi-Z
Power Down
schematics
VCO block schematic (VCO1, VCO2)
Bias
Circuit
VCO
Output
1/2
RBIAS
VCOIN1,
VCOIN2
(VCO control)
VCOINHIBIT
VCO OUT1,
VCO OUT2
SELECT1,2
M
U
X
Ring Oscillator
PFD block schematic (PFD1, PFD2)
Detector
Charge Pump
PFD OUT
FIN –A
FIN –B
PFD INHIBIT
VDD


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