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74VHC4046 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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74VHC4046 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 14 page 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 |
Similar Part No. - 74VHC4046 |
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Similar Description - 74VHC4046 |
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