TLC2933A Datasheet, PDF (4/19 Pages) Texas Instruments – HIGH PERFORMANCE PHASE LOCKED LOOP

TLC2933A
HIGH PERFORMANCE PHASE LOCKED LOOP
SLES149 − OCTOBER 2005
FIN−A
FIN−B
PFD OUT
VOH
HI-Z
VOL
Figure 2. PFD Function Timing Chart
PFD inhibit control
A high level on the PFD INHIBIT terminal places PFD OUT in the high-impedance state and the PFD stops
phase detection as shown in Table 3. A high level on the PFD INHIBIT terminal can also be used as the
power-down mode for the PFD.
Table 3. VCO Output Control Function
PFD INHIBIT
Low
High
VCO block schematic
DETECTION
Active
Stopped
PFD OUT
Active
Hi−Z
IDD(PFD)
Normal
Power Down
PFD block schematic
FIN−A
FIN−B
PFD INHIBIT
Detector
Charge Pump
VDD
PFD OUT
4
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