TLC2932
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997
PARAMETER MEASUREMENT INFORMATION
VCO OUT
90%
10%
tr
90%
10%
tf
Figure 3. VCO Output Voltage Waveform
VDD
GND
FIN– B†
VDD
GND
VDD
50%
GND
tr
PFD OUT
tPZH
(a) OUTPUT PULLDOWN
(see Figure 5 and Table 4)
† FIN–A and FIN–B are for reference phase only, not for timing.
10%
90%
50%
50%
GND
tPZL
(b) OUTPUT PULLUP
(see Figure 5 and Table 4)
tPHZ
VOH
90%
tf
50%
10%
50%
tPLZ
VDD
VOL
50%
GND
VDD
GND
VDD
GND
VDD
FIN– A†
PFD INHIBIT
Figure 4. PFD Output Voltage Waveform
Table 4. PFD Output Test Conditions
PARAMETER
tPZH
tPHZ
tr
tPZL
tPLZ
tf
1 kΩ
15 pF
Close
Open
RL
CL
S1
Open
S2
Close
DUT
PFD OUT
S2
Test Point
VDD
S1
RL
CL
Figure 5. PFD Output Test Conditions
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DALLAS, TEXAS 75265
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TI [ TEXAS INSTRUMENTS ]
