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. 709-7547
Mfr. Part No.ADF4116BRUZ
SGD9.54
Each
units
- - - - Surface Mount 1 - TSSOP 5.5 mA 16 5 x 4.4 x 1.05mm 550MHz 1.05mm 5mm
RS Stock No. 169-8384
Mfr. Part No.CS2000CP-CZZ
SGD10.82
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
RS Stock No. 178-6978
Mfr. Part No.74HCT4046AD,112
BrandNexperia
SGD1.132
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. 169-8383
Mfr. Part No.CS2300-CP-CZZ
SGD7.78
Each (In a Tube of 96)
units
- - - 75MHz Surface Mount 1 6MHz MSOP ±10 mA 10 3 x 3 x 0.95mm 30MHz 0.95mm 3mm
New
RS Stock No. 216-6220
Mfr. Part No.871S1022EKLF
SGD21.69
Each
units
- - - - - - - VFQFPN-32 100 mA 32 - 100MHz - -
RS Stock No. 809-5927
Mfr. Part No.SN74LV4046AN
SGD2.40
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. 660-7755
Mfr. Part No.PLL1708DBQ
SGD8.72
Each
units
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS Stock No. 697-7552
Mfr. Part No.ADF4107BRUZ
SGD10.67
Each
units
- - - - Surface Mount 1 - CP 20 - 16 5 x 4.4 x 1.05mm 7000MHz 1.05mm 5mm
RS Stock No. 170-3521
Mfr. Part No.NB3N5573DTG
SGD5.98
Each (In a Tube of 96)
units
- - - 200MHz Surface Mount 2 25MHz TSSOP 135 mA 16 5.1 x 4.5 x 1.05mm 25MHz 1.05mm 5.1mm
RS Stock No. 817-5537
Mfr. Part No.TRF3765IRHBT
SGD22.36
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. 162-4651
Mfr. Part No.CDCVF25084PW
SGD15.101
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. 161-2591
Mfr. Part No.NB4N507ADG
SGD5.593
Each (In a Tube of 48)
units
- - - 200MHz Surface Mount 1 50MHz SOIC 35 mA 16 10 x 4 x 1.5mm 27MHz 1.5mm 10mm
RS Stock No. 108-353
Mfr. Part No.ADF4252BCPZ
SGD9.51
Each
units
- - - - Surface Mount 2 - CP 24 16 mA 24 4 x 4 x 0.83mm 3000MHz 0.83mm 4mm
RS Stock No. 161-2843
Mfr. Part No.Si5332A-C-GM2
SGD18.68
Each (In a Tray of 490)
units
- - - 312.5MHz Surface Mount 10 5MHz QFN 70 mA 40 6 x 6 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 6mm
RS Stock No. 145-2977
Mfr. Part No.MC14046BDWG
SGD1.252
Each (In a Tube of 47)
units
- - - 0.7MHz Surface Mount - 0.5MHz SOIC ±1 μA 16 10.45 x 7.6 x 2.4mm - 2.4mm 10.45mm
RS Stock No. 163-2552
Mfr. Part No.NB3N2302DG
SGD2.92
Each (In a Tube of 98)
units
- - - 133MHz Surface Mount 2 10MHz SOIC 50 mA 8 5 x 4 x 1.5mm 133MHz 1.5mm 5mm
RS Stock No. 125-6941
Mfr. Part No.CY22150KFZXC
SGD24.49
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 708-9943
Mfr. Part No.ADF4108BCPZ
SGD11.91
Each
units
- - - 325MHz Surface Mount 1 - CP 20 1 17 mA 20 4 x 4 x 0.83mm 8000MHz 0.83mm 4mm
RS Stock No. 634-192
Mfr. Part No.CD74HCT297E
SGD3.52
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 865-2270
Mfr. Part No.ADF5355BCPZ
SGD113.63
Each
units
- - - 13600MHz Surface Mount 3 54MHz LFCSP 85 mA 32 5.1 x 5.1 x 0.75mm 600MHz 0.75mm 5.1mm