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. 709-6020
Mfr. Part No.AD5934YRSZ
TWD991.00
Each
units
Digital Synthesizer 250ksps 12 bit - Surface Mount - - SSOP - 16 6.2 x 5.3 x 1.75mm - 1.75mm 6.2mm
RS Stock No. 709-4807
Mfr. Part No.AD5932YRUZ
TWD376.00
Each
units
- - - - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 483-6774
Mfr. Part No.74HCT9046AD,112
BrandNexperia
TWD92.20
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 103-5689
Mfr. Part No.74HCT9046AD,112
BrandNexperia
TWD78.30
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 923-6693
Mfr. Part No.CD4046BE
TWD18.50
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
TWD18.50
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. 716-5804
Mfr. Part No.CS2300-CP-CZZ
TWD220.00
Each
units
- - - 75MHz Surface Mount 1 6MHz MSOP ±10 mA 10 3 x 3 x 0.95mm 30MHz 0.95mm 3mm
RS Stock No. 809-6191
Mfr. Part No.CD4046BPW
TWD17.20
Each (In a Pack of 15)
units
- - - 1.6 MHz, 2.4 MHz Surface Mount 1 0.8 MHz, 1.4 MHz TSSOP 0.1 → 1 μA 16 5.1 x 4.5 x 1.05mm 1.4MHz 1.05mm 5.1mm
RS Stock No. 787-6920
Mfr. Part No.NB3N502DG
TWD142.00
Each (In a Pack of 2)
units
- - - 190MHz Surface Mount 1 14MHz SOIC 20 mA 8 5 x 4 x 1.5mm 50MHz 1.5mm 5mm
RS Stock No. 145-3853
Mfr. Part No.NB3N502DG
TWD120.80
Each (In a Tube of 98)
units
- - - 190MHz Surface Mount 1 14MHz SOIC 20 mA 8 5 x 4 x 1.5mm 50MHz 1.5mm 5mm
RS Stock No. 169-8383
Mfr. Part No.CS2300-CP-CZZ
TWD189.60
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
RS Stock No. 145-1118
Mfr. Part No.CD4046BPW
TWD14.60
Each (In a Tube of 90)
units
- - - 1.6 MHz, 2.4 MHz Surface Mount 1 0.8 MHz, 1.4 MHz TSSOP 0.1 → 1 μA 16 5.1 x 4.5 x 1.05mm 1.4MHz 1.05mm 5.1mm
RS Stock No. 496-9947
Mfr. Part No.AD9834BRUZ
TWD407.00
Each
units
Digital Synthesizer 75Msps 10 bit - Surface Mount - - TSSOP - 20 6.5 x 4.4 x 1.05mm - 1.05mm 6.5mm
RS Stock No. 523-6383
Mfr. Part No.ADF4113BRUZ
TWD217.00
Each
units
- - - - Surface Mount 1 - CP 20 11 mA 16 5 x 4.4 x 1.05mm 4000MHz 1.05mm 5mm
RS Stock No. 708-9943
Mfr. Part No.ADF4108BCPZ
TWD299.00
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. 162-6986
Mfr. Part No.CDCE706PW
TWD302.30
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. 170-3521
Mfr. Part No.NB3N5573DTG
TWD145.80
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. 787-6930
Mfr. Part No.NB3N5573DTG
TWD172.00
Each
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. 796-8710
Mfr. Part No.ADF4351BCPZ
TWD554.00
Each
units
- - - 4400MHz Surface Mount 1 35MHz LFCSP 27 mA 32 5 x 4.75 x 0.95mm 250MHz 0.95mm 5mm
RS Stock No. 709-2637
Mfr. Part No.PLL1707DBQ
TWD191.00
Each
units
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm