TLC2933_13 Datasheet, PDF (9/24 Pages) Texas Instruments – HIGH-PERFORMANCE PHASE-LOCKED LOOP

TLC2933
HIGHĆPERFORMANCE PHASEĆLOCKED LOOP
SLAS136B − APRIL 1996 − REVISED JANUARY 2002
PARAMETER MEASUREMENT INFORMATION
VCO OUT
90%
10%
90%
10%
tr
tf
Figure 3. VCO Output Voltage Waveform
FIN− A†
FIN− B†
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)
† _{FIN−A and FIN−B 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 kΩ
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
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