74VHC4046 ,CMOS Phase Lock LoopGeneral Descriptionmonics than the other two comparators.The VHC4046 is a low power phase lock loop ..
74VHC4046M ,CMOS Phase Lock LoopBlock Diagram 274VHC404674VHC4046Absolute Maximum Ratings(Note 1) Recommended Operating (Note 2)Con ..
74VHC4046MTCX ,CMOS Phase Lock LoopGeneral Descriptionmonics than the other two comparators.The VHC4046 is a low power phase lock loop ..
74VHC4046MX ,CMOS Phase Lock LoopGeneral Descriptionmonics than the other two comparators.The VHC4046 is a low power phase lock loop ..
74VHC4046N ,CMOS Phase Lock LoopBlock Diagram 274VHC404674VHC4046Absolute Maximum Ratings(Note 1) Recommended Operating (Note 2)Con ..
74VHC4051M ,8-Channel Analog Multiplexer74VHC4051 • 74VHC4052 • 74VHC4053 8-Channel Analog Multiplexer • Dual 4-Channel Analog Multiplexer ..
74VHC4046
CMOS Phase Lock Loop
74VHC4046 CMOS Phase Lock Loop April 1994 Revised April 1999 74VHC4046 CMOS Phase Lock Loop ing the loop out of lock, but is less likely to lock onto har- General Description monics than the other two comparators. The VHC4046 is a low power phase lock loop utilizing In a typical application any one of the three comparators advanced silicon-gate CMOS technology to obtain high fre- feed an external filter network which in turn feeds the VCO quency operation both in the phase comparator and VCO input. This input is a very high impedance CMOS input sections. This device contains a low power linear voltage which also drives the source follower. The VCO’s operating controlled oscillator (VCO), a source follower, and three frequency is set by three external components connected phase comparators. The three phase comparators have a to the C1 , C1 , R and R pins. An inhibit pin is provided A B 1 2 common signal input and a common comparator input. The to disable the VCO and the source follower, providing a signal input has a self biasing amplifier allowing signals to method of putting the IC in a low power state. be either capacitively coupled to the phase comparators with a small signal or directly coupled with standard input The source follower is a MOS transistor whose gate is con- nected to the VCO input and whose drain connects the logic levels. This device is similar to the CD4046 except that the Zener diode of the metal gate CMOS device has Demodulator output. This output normally is used by tying a resistor from pin 10 to ground, and provides a means of been replaced with a third phase comparator. looking at the VCO input without loading down modifying Phase Comparator I is an exclusive OR (XOR) gate. It pro- the characteristics of the PLL filter. vides a digital error signal that maintains a 90 phase shift between the VCO’s center frequency and the input signal Features (50% duty cycle input waveforms). This phase detector is more susceptible to locking onto harmonics of the input fre- � Low dynamic power consumption: (V = 4.5V) CC quency than phase comparator I, but provides better noise � Maximum VCO operating frequency: 12 MHz rejection. (V = 4.5V) CC Phase comparator III is an SR flip-flop gate. It can be used to provide the phase comparator functions and is similar to � Fast comparator response time (V = 4.5V) CC the first comparator in performance. Comparator I: 25 ns Phase comparator II is an edge sensitive digital sequential Comparator II: 30 ns network. Two signal outputs are provided, a comparator Comparator III: 25 ns output and a phase pulse output. The comparator output is � VCO has high linearity and high temperature stability a 3-STATE output that provides a signal that locks the VCO output signal to the input signal with 0 phase shift between � Pin and function compatible with the 74HC4046 them. This comparator is more susceptible to noise throw- Ordering Code: Order Number Package Number Package Description 74VHC4046M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 74VHC4046MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 74VHC4046N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. © 1999 DS011675.prf
