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. 170-3521
Mfr. Part No.NB3N5573DTG
PHP221.235
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. 145-2977
Mfr. Part No.MC14046BDWG
PHP41.251
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. 801-0248
Mfr. Part No.FS7140-02G-XTD
PHP389.475
Each (In a Pack of 2)
units
- - - 150 MHz, 300MHz Surface Mount 1 0MHz SSOP 35 mA 16 6.33 x 5.38 x 1.78mm 35MHz 1.78mm 6.33mm
RS Stock No. 145-3624
Mfr. Part No.NBC12439AMNG
PHP522.218
Each (In a Tube of 74)
units
- - - 800MHz Surface Mount 1 400MHz QFN 85 mA 32 5 x 5 x 0.95mm 20MHz 0.95mm 5mm
RS Stock No. 145-5203
Mfr. Part No.FS7140-02G-XTD
PHP332.333
Each (In a Tube of 76)
units
- - - 150 MHz, 300MHz Surface Mount 1 0MHz SSOP 35 mA 16 6.33 x 5.38 x 1.78mm 35MHz 1.78mm 6.33mm
RS Stock No. 802-2014
Mfr. Part No.NB3N3020DTG
PHP454.30
Each
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. 787-6930
Mfr. Part No.NB3N5573DTG
PHP260.34
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. 802-2077
Mfr. Part No.NBC12439AMNG
PHP592.70
Each
units
- - - 800MHz Surface Mount 1 400MHz QFN 85 mA 32 5 x 5 x 0.95mm 20MHz 0.95mm 5mm
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. 806-3179
Mfr. Part No.MC14046BDWG
PHP43.892
Each (In a Pack of 20)
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. 827-0673
Mfr. Part No.NB3N51032DTG
PHP216.09
Each (In a Pack of 2)
units
- - - 200MHz Surface Mount 2 25MHz TSSOP 100 mA 16 5.1 x 4.5 x 1.05mm 25MHz 1.05mm 5.1mm
RS Stock No. 145-3853
Mfr. Part No.NB3N502DG
PHP179.561
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. 787-7012
Mfr. Part No.P3MS650103H-4CR
PHP62.042
Each (In a Pack of 5)
units
- - - 60MHz Surface Mount 1 15MHz WDFN 9 mA 4 1 x 1.2 x 0.75mm 60MHz 0.75mm 1mm
RS Stock No. 787-6920
Mfr. Part No.NB3N502DG
PHP210.945
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. 163-2552
Mfr. Part No.NB3N2302DG
PHP95.612
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. 145-4049
Mfr. Part No.NB3N51032DTG
PHP183.676
Each (In a Tube of 96)
units
- - - 200MHz Surface Mount 2 25MHz TSSOP 100 mA 16 5.1 x 4.5 x 1.05mm 25MHz 1.05mm 5.1mm
RS Stock No. 186-9936
Mfr. Part No.FS6377-01IG-XTD
PHP648.27
Each
units
- - - 150MHz Surface Mount 4 0.8MHz SOIC 43 mA 16 9.98 x 3.99 x 1.55mm 230MHz 1.55mm 9.98mm
RS Stock No. 161-2591
Mfr. Part No.NB4N507ADG
PHP184.191
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. 162-9621
Mfr. Part No.P3MS650103H-4CR
PHP51.695
Each (On a Reel of 3000)
units
- - - 60MHz Surface Mount 1 15MHz WDFN 9 mA 4 1 x 1.2 x 0.75mm 60MHz 0.75mm 1mm
RS Stock No. 186-9049
Mfr. Part No.FS6377-01IG-XTD
PHP571.61
Each (In a Tube of 48)
units
- - - 150MHz Surface Mount 4 0.8MHz SOIC 43 mA 16 9.98 x 3.99 x 1.55mm 230MHz 1.55mm 9.98mm