Clock Synthesizers

A clock synthesizer is an electronic circuit that converts a single clock signal frequency into a range of output frequencies. Frequency values are given in MHz. Clock synthesizers can generate frequencies in multiples of the original, also known as a conversion rate. They can work in a phase-locked look, also known as a PLL.

Clock synthesizers are semiconductor devices which come in a standard package, such has a QFN, TSSOP or SOIC.

Where are Clock Synthesizersused used?

  • Wireless devices
  • RF devices
  • Radio
  • GPS
  • TV
  • Mobile phones

What is a PLL Synthesizer?

PLL synthesizers are analogue devices. A PLL circuit features a Voltage-Controlled Oscillator (VCO). The VCO output is constantly adjusted to match the phase and frequency of an input signal, using feedback from a Phase Comparator. A PLL circuit is often used to synchronise (lock) RF receiver circuits to an incoming carrier signal. If a frequency divider integer-n is introduced between the VCO output and the phase comparator, the PLL circuit output frequency will be fin/n, locked in phase to fin. If fin comes from a highly-stable fixed frequency oscillator and n is programmable, then the circuit forms the basis of an accurate Digital Frequency Synthesizer.

What is a Direct Digital Synthesizer?

Direct digital synthesizers (DDS) are digital devices. They are made up of a crystal oscillator, an NCO (numerically controlled oscillator) and a DAC (digital-to-analogue converter). DDS, in comparison to an analogue PLL synthesizer, offer improved phase noise and better control over the output where there are transitions between frequencies. They also offer better jitter performance.


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Description Price Category Conversion Rate Resolution Maximum Output Frequency Mounting Type Number of Elements per Chip Minimum Output Frequency Package Type Maximum Supply Current Pin Count Dimensions Maximum Input Frequency Height Length
RS Stock No. 145-6056
Mfr. Part No.SN74LV4046AN
HK$11.896
Each (In a Tube of 25)
units
- - - 38MHz Through Hole - - PDIP ±70 mA 16 19.69 x 6.6 x 4.57mm - 4.57mm 19.69mm
RS Stock No. 809-5927
Mfr. Part No.SN74LV4046AN
HK$547.50
Each (In a Pack of 5)
units
- - - 38MHz Through Hole - - PDIP ±70 mA 16 19.69 x 6.6 x 4.57mm - 4.57mm 19.69mm
RS Stock No. 923-6693
Mfr. Part No.CD4046BE
HK$4.893
Each (In a Tube of 25)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 709-1965
Mfr. Part No.CD4046BE
HK$4.893
Each (In a Pack of 10)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 662-3961
Mfr. Part No.CD74HC4046AM96
HK$4.883
Each (In a Pack of 10)
units
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS Stock No. 162-6951
Mfr. Part No.CD74HC4046AM96
HK$2.142
Each (On a Reel of 2500)
units
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS Stock No. 634-192
Mfr. Part No.CD74HCT297E
HK$25.04
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 162-6986
Mfr. Part No.CDCE706PW
HK$73.511
Each (In a Tube of 70)
units
- - - - Surface Mount 3 - TSSOP 115 mA 20 6.5 x 4.4 x 1.15mm 200MHz 1.15mm 6.5mm
RS Stock No. 162-4651
Mfr. Part No.CDCVF25084PW
HK$80.649
Each (In a Tube of 90)
units
- - - 180MHz Surface Mount 1 10MHz TSSOP - 16 5 x 4.4 x 1.15mm 45MHz 1.15mm 5mm
RS Stock No. 662-4595
Mfr. Part No.CD74HCT4046AM
HK$4.244
Each (In a Pack of 10)
units
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS Stock No. 162-4153
Mfr. Part No.CD74HCT7046AE
HK$24.35
Each (In a Tube of 25)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 662-4605
Mfr. Part No.CDCE706PW
HK$85.31
Each
units
- - - - Surface Mount 3 - TSSOP 115 mA 20 6.5 x 4.4 x 1.15mm 200MHz 1.15mm 6.5mm
RS Stock No. 620-2173
Mfr. Part No.CDCVF25084PW
HK$101.08
Each
units
- - - 180MHz Surface Mount 1 10MHz TSSOP - 16 5 x 4.4 x 1.15mm 45MHz 1.15mm 5mm
RS Stock No. 162-8143
Mfr. Part No.CDCM61004RHBT
HK$53.848
Each (On a Reel of 250)
units
- - - 683.264MHz Surface Mount 4 43.75MHz VQFN 65 mA 32 5.15 x 5.15 x 0.95mm 28.47MHz 0.95mm 5.15mm
RS Stock No. 168-5010
Mfr. Part No.LMX2581SQE/NOPB
HK$76.066
Each (On a Reel of 250)
units
- - - 3760MHz Surface Mount 4 50MHz WQFN 134 mA 32 5 x 5 x 0.8mm 900MHz 0.8mm 5mm
RS Stock No. 162-7733
Mfr. Part No.LMK03806BISQE/NOPB
HK$89.898
Each (On a Reel of 250)
units
- - - 312.5MHz Surface Mount 1 - WQFN 445 mA 64 9.1 x 9.1 x 0.8mm 500MHz 0.8mm 9.1mm
RS Stock No. 145-0657
Mfr. Part No.CD74HC4046AE
HK$4.676
Each (In a Tube of 25)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 162-5220
Mfr. Part No.PLL1708DBQ
HK$42.394
Each (In a Tube of 50)
units
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS Stock No. 817-5537
Mfr. Part No.TRF3765IRHBT
HK$141.25
Each
units
- - - 4800MHz Surface Mount - 300MHz VQFN 190 mA 32 5.15 x 5.15 x 0.95mm 350MHz 0.95mm 5.15mm
RS Stock No. 162-8432
Mfr. Part No.TRF3765IRHBT
HK$104.223
Each (On a Reel of 250)
units
- - - 4800MHz Surface Mount - 300MHz VQFN 190 mA 32 5.15 x 5.15 x 0.95mm 350MHz 0.95mm 5.15mm