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SN74LV4046ADRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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SN74LV4046ADRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page SN74LV4046A www.ti.com SCES656D – FEBRUARY 2006 – REVISED SEPTEMBER 2015 7.3 Feature Description There are three choices for the Phase Comparators in this device which are listed as below: • Phase comparator 1 (PC1) is an Exclusive OR network. The average output voltage from PC1, fed to VCO input through the low pass filter and seen at the demodulator output at pin 10 (VDEMOUT), is the resultant of the phase differences of signals (SIGIN) and the compartor input (COMPIN) as shown in Figure 7. The average of V DEM is equal to 1/2 VCC when there is no signal or noise at SIGIN, and with this input the VCO oscillates at the center frequency (fo). • Phase comparator 2 (PC2) is an Edge-Triggered Flip-Flop. This is a positive edge-triggered phase and frequency detector. When the PLL is using this comparator, the loop is controlled by positive signal transitions and the duty factors of SIGIN and COMPIN are not important. PC2 comprises two D-type flip-flops, control- gating and a three-state output stage. The circuit functions as an up-down counter where SIGIN causes an up- count and COMPIN a down-count. The average output voltage from PC2, fed to the VCO through the lowpass filter and seen at the demodulator output at pin 10 (VDEMOUT), is the resultant of the phase differences of SIGIN and COMPINas in Figure 8. • Phase comparator 3 (PC3) is an positive Edge-Triggered RS Flip-Flop. This is a positive edge-triggered sequential phase detector using an RS-type flip-flop. When the PLL is using this comparator, the loop is controlled by positive signal transitions and the duty factors of SIGIN and COMPIN are not important. The average output from PC3, fed to the VCO through the lowpass filter and seen at the demodulator at pin 10 (VDEMOUT), is the resultant of the phase differences of SIGIN and COMPIN as shown in Figure 9. The excellent VCO linearity is achieved by the use of linear operational amplifier techniques. It has low standby power consumption using VCO inhibit control. Wide operating temperature range from –40°C to 125°C along with an optimized power supply voltage range from 3 V to 5.5 V. 7.4 Device Functional Modes The SN74LV4046A device does not feature any special functional modes. Copyright © 2006–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN74LV4046A |
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