TLC2942 Datasheet, PDF (12/28 Pages) Texas Instruments – HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK

TLC2942
HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997
PARAMETER MEASUREMENT INFORMATION
VCO OUT1,
VCO OUT2
90%
10%
90%
10%
tr
tf
Figure 3. VCO Output Voltage Waveform
FIN– A1,
FIN– A2
FIN– B1,
FIN– B2
VDD
GND
VDD
GND
PFD INHIBIT1,
PFD INHIBIT2
PFD OUT1,
PFD OUT2
50%
tr
tPHZ
10%
90%
50%
50%
tPZH
(a) OUTPUT PULLDOWN
(see Figure 5 and Table 6)
VDD
GND
VOH
GND
90%
tPZL
50%
tf
50%
10%
tPLZ
50%
(b) OUTPUT PULLUP
(see Figure 5 and Table 6)
† _{FIN–A and FIN–B are for reference phase only, not for timing.}
Figure 4. PFD Output Voltage Waveform
VDD
GND
VDD
GND
VDD
GND
VDD
VOL
Table 6. PFD1 and PDF2 Output Test Conditions
PARAMETER
tPZH
tPHZ
tr
tPZL
tPLZ
tf
RL
1 kΩ
CL
S1
S2
Open Close
15 pF
Close Open
Test Point
PFD OUT
DUT
RL
CL
VDD
S1
S2
Figure 5. PFD1 and PFD2 Output Test Conditions
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