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. 168-9977
Mfr. Part No.SI5356A-B-GM
SGD6.736
Each (In a Tray of 75)
units
- - - 200MHz Surface Mount - 1MHz QFN 60 mA 24 4 x 4 x 0.85mm 200MHz 0.85mm 4mm
RS Stock No. 796-0344
Mfr. Part No.Si5356A-B-GM
SGD8.41
Each (In a Pack of 2)
units
- - - 200MHz Surface Mount - 1MHz QFN 60 mA 24 4 x 4 x 0.85mm 200MHz 0.85mm 4mm
RS Stock No. 796-0101
Mfr. Part No.Si5326C-C-GM
SGD43.15
Each
units
- - - 346MHz Surface Mount 4 2kHz QFN 279 mA 36 6 x 6 x 0.85mm 710MHz 0.85mm 6mm
RS Stock No. 161-2842
Mfr. Part No.Si5332A-C-GM1
SGD15.931
Each (In a Tray of 490)
units
- - - 312.5MHz Surface Mount 7 5MHz QFN 70 mA 32 5 x 5 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 5mm
RS Stock No. 161-2848
Mfr. Part No.Si5332C-C-GM1
SGD12.338
Each (In a Tray of 490)
units
- - - 312.5MHz Surface Mount 7 5MHz QFN 70 mA 32 5 x 5 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 5mm
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. 173-2768
Mfr. Part No.SI5326C-C-GM
SGD35.322
Each (In a Tray of 490)
units
- - - 346MHz Surface Mount 4 2kHz QFN 279 mA 36 6 x 6 x 0.85mm 710MHz 0.85mm 6mm
RS Stock No. 880-6976
Mfr. Part No.Si5341A-D-GM
SGD34.90
Each
units
- - - 712.5MHz Surface Mount 1 0.0001MHz QFN 150 mA 64 9 x 9 x 0.85mm 750MHz 0.85mm 9mm
RS Stock No. 161-2883
Mfr. Part No.Si5332C-C-GM1
SGD13.56
Each
units
- - - 312.5MHz Surface Mount 7 5MHz QFN 70 mA 32 5 x 5 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 5mm
RS Stock No. 161-2870
Mfr. Part No.Si5332A-C-GM1
SGD20.20
Each
units
- - - 312.5MHz Surface Mount 7 5MHz QFN 70 mA 32 5 x 5 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 5mm
RS Stock No. 161-2853
Mfr. Part No.Si5332D-C-GM3
SGD11.561
Each (In a Tray of 490)
units
- - - 200MHz Surface Mount 14 5MHz QFN 70 mA 48 6 x 6 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 6mm
RS Stock No. 161-2838
Mfr. Part No.Si52208-A01AGM
SGD4.699
Each (In a Tray of 490)
units
- - - 100MHz Surface Mount 4 - QFN 63 mA 48 6 x 6 x 0.85mm 25MHz 0.85mm 6mm
RS Stock No. 161-2864
Mfr. Part No.Si52208-A01AGM
SGD6.19
Each (In a Pack of 2)
units
- - - 100MHz Surface Mount 4 - QFN 63 mA 48 6 x 6 x 0.85mm 25MHz 0.85mm 6mm
RS Stock No. 161-2872
Mfr. Part No.Si5332A-C-GM2
SGD18.68
Each
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. 161-2895
Mfr. Part No.Si5332D-C-GM3
SGD14.29
Each
units
- - - 200MHz Surface Mount 14 5MHz QFN 70 mA 48 6 x 6 x 0.85mm 50 MHz, 170 MHz, 250MHz 0.85mm 6mm