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74VHC4046 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 74VHC4046
Description  CMOS Phase Lock Loop
Download  14 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

74VHC4046 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Comparator I
Comparator II
III
R2e %
R2i %
R2e %
R2i %
– Given f0
– Given f0 and fL
– Given fmax
– Given fmin and fmax
– Use f0 with curve titled
– Calculate fmin from the
– Calculate f0 from the
– Use fmin with curve titled
center frequency vs R1 C
equation fmin e fo b fL
equation fo e fmax 2
offset frequency vs R2
to determine R1 and C1
– Use fmin with curve titled
– Use f0 with curve titled
C to determine R2 and C1
offset frequency vs R2 C
center frequency vs R1 C
– Calculate fmax fmin
to determine R2 and C1
to determine R1 and C1
– Use fmax fmin with curve
– Calculate fmax fmin from
titled fmax fmin vs R2R1
the equation fmax fmin e
to determine ratio R2R1
fo a fL fo b fL
to obtain R1
– Use fmax fmin with curve
titled fmax fmin vs R2R1
to determine ratio R2R1
to obtain R1
(b)
FIGURE 1
(Continued)
Detailed Circuit Description
VOLTAGE CONTROLLED OSCILLATORSOURCE
FOLLOWER
The VCO requires two or three external components to op-
erate These are R1 R2 C1 Resistor R1 and capacitor C1
are selected to determine the center frequency of the VCO
R1 controls the lock range As R1’s resistance decreases
the range of fmin to fmax increases Thus the VCO’s gain
decreases As C1 is changed the offset (if used) of R2 and
the center frequency is changed (See typical performance
curves) R2 can be used to set the offset frequency with 0V
at VCO input If R2 is omitted the VCO range is from 0Hz As
R2 is decreased the offset frequency is increased The ef-
fect of R2 is shown in the design information table and typi-
cal performance curves By increasing the value of R2 the
lock range of the PLL is offset above 0Hz and the gain
(Voltsrad) does not change In general when offset is de-
sired R2 and C1 should be chosen first and then R1 should
be chosen to obtain the proper center frequency
Internally the resistors set a current in a current mirror as
shown in
Figure 1 The mirrored current drives one side of
TLF11675 – 18
FIGURE 2 Logic Diagram for VCO
8


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