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TLC2942 Datasheet(PDF) 5 Page - Texas Instruments

Part No. TLC2942
Description  HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TLC2942
HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
VCO inhibit function
Each VCO has an externally controlled inhibit function that inhibits the VCO output. The VCO oscillation is
stopped during a high level on VCOINHIBIT, so the high level can also be used as the power-down mode. The
VCO output maintains a low level during the power-down mode (see Table 2 and Table 3).
Table 2. VCO1 Inhibit Function
VCOINHIBIT1
VCO1 OSCILLATOR
VCO OUT1
VCO1 IDD
Low
Active
Active
Normal
High
Stop
Low
Power Down
Table 3. VCO2 Inhibit Function
VCOINHIBIT2
VCO2 OSCILLATOR
VCO OUT2
VCO2 IDD
Low
Active
Active
Normal
High
Stop
Low
Power Down
PFD operation
The PFD is a high-speed, edge-triggered detector with an internal charge pump. The PFD detects the phase
difference between two frequency inputs supplied to FIN–A and FIN–B as shown in Figure 2. Nominally the
reference is supplied to FIN–A, and the frequency from the external counter output is fed to FIN–B.
FIN– A1,
FIN–A2
FIN– B1,
FIN–B2
PFD OUT1,
PFD OUT2
VOH
Hi-Z
VOL
Figure 2. PFD Function Timing Chart




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