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TLC2933A_16 Datasheet, PDF (4/24 Pages) Texas Instruments – HIGH PERFORMANCE PHASE LOCKED LOOP | |||
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TLC2933A
HIGH PERFORMANCE PHASE LOCKED LOOP
SLES149 â OCTOBER 2005
FINâA
FINâB
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
HiâZ
IDD(PFD)
Normal
Power Down
PFD block schematic
FINâA
FINâB
PFD INHIBIT
Detector
Charge Pump
VDD
PFD OUT
4
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