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TLC2933 Datasheet, PDF (9/21 Pages) Texas Instruments – HIGH-PERFORMANCE PHASE-LOCKED LOOP | |||
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TLC2933
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS136A â APRIL 1996 â REVISED JUNE 1997
PARAMETER MEASUREMENT INFORMATION
VCO OUT
90%
10%
90%
10%
tr
tf
Figure 3. VCO Output Voltage Waveform
FINâ Aâ
FINâ Bâ
VDD
GND
VDD
GND
VDD
GND
VDD
GND
PFD INHIBIT
50% 50%
VDD
GND
PFD OUT
10%
tPZH
tr
90%
50%
tPHZ
50%
VOH
Hi-Z
(a) PFD OUT Hi-Z Timing To and From a High Level
(see Figure 5 and Table 3)
50%
50%
90%
tPZL
tf
50%
10%
tPLZ
50%
VDD
GND
Hi-Z
VOL
(b) PFD OUT Hi-Z Timing To and From a Low Level
(see Figure 5 and Table 3)
â FINâA and FINâB are for reference phase only, not for timing.
Figure 4. PFD Output Voltage Waveform
Table 3. PFD Output Test Conditions
PARAMETER
tPZH
tPHZ
tr
tPZL
tPLZ
tf
RL
1 kâ¦
CL
S1
S2
Open Closed
15 pF
Closed Open
Test Point
PFD OUT
DUT
RL
CL
VDD
S1
S2
Figure 5. PFD Output Test Conditions
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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