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. 131-1219
Mfr. Part No.ADF4356BCPZ
PHP2,357.44
Each
units
- - - 6800MHz Surface Mount - 53.12MHz LFCSP 90 mA 32 5.1 x 5.1 x 0.75mm 250 MHz, 600MHz 0.75mm 5.1mm
RS Stock No. 178-6974
Mfr. Part No.74HC4046AD,652
BrandNexperia
PHP23.772
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 483-6538
Mfr. Part No.74HC4046AD,652
BrandNexperia
PHP29.326
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 178-6978
Mfr. Part No.74HCT4046AD,112
BrandNexperia
PHP35.091
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 909-3468
Mfr. Part No.HMC703LP4E
PHP1,695.79
Each
units
- - - - Surface Mount 1 - QFN 95 mA 24 4.1 x 4.1 x 0.95mm 8000MHz 0.95mm 4.1mm
RS Stock No. 662-4589
Mfr. Part No.CD74HC4046AE
PHP30.818
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. 523-6377
Mfr. Part No.ADF4110BRUZ
PHP329.28
Each
units
- - - - Surface Mount 1 - CP 20 5.5 mA 16 5 x 4.4 x 1.05mm 550MHz 1.05mm 5mm
RS Stock No. 103-5689
Mfr. Part No.74HCT9046AD,112
BrandNexperia
PHP121.28
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 162-4153
Mfr. Part No.CD74HCT7046AE
PHP139.43
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. 634-192
Mfr. Part No.CD74HCT297E
PHP126.88
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 650-122
Mfr. Part No.CD74HCT7046AE
PHP154.86
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 100-0740
Mfr. Part No.CD74HCT297E
PHP177.502
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. 160-3297
Mfr. Part No.HMC703LP4E
PHP1,479.897
Each (On a Reel of 50)
units
- - - - Surface Mount 1 - QFN 95 mA 24 4.1 x 4.1 x 0.95mm 8000MHz 0.95mm 4.1mm
RS Stock No. 862-6458
Mfr. Part No.HMC830LP6GE
PHP1,151.45
Each
units
- - - 3000MHz Surface Mount 1 25MHz QFN 105 mA 40 6.1 x 6.1 x 0.9mm 3000MHz 0.9mm 6.1mm
RS Stock No. 145-0657
Mfr. Part No.CD74HC4046AE
PHP30.818
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. 160-2710
Mfr. Part No.HMC830LP6GE
PHP1,006.877
Each (On a Reel of 50)
units
- - - 3000MHz Surface Mount 1 25MHz QFN 105 mA 40 6.1 x 6.1 x 0.9mm 3000MHz 0.9mm 6.1mm
RS Stock No. 483-6774
Mfr. Part No.74HCT9046AD,112
BrandNexperia
PHP142.80
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 483-6724
Mfr. Part No.74HCT4046AD,112
BrandNexperia
PHP42.19
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 162-8970
Mfr. Part No.NB3N3020DTG
PHP391.534
Each (In a Tube of 96)
units
- - - 210MHz Surface Mount 1 - TSSOP 75 mA 16 5.1 x 4.5 x 1.05mm 210MHz 1.05mm 5.1mm
RS Stock No. 169-8384
Mfr. Part No.CS2000CP-CZZ
PHP384.30
Each (In a Tube of 96)
units
- - - 75MHz Surface Mount 1 6MHz MSOP 18 mA 10 3 x 3 x 0.95mm 30MHz 0.95mm 3mm