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
New
RS Stock No. 216-6267
Mfr. Part No.9FG104EGILFT
HK$63.37
Each (In a Pack of 2)
units
- - - - - - - TSSOP 109 mA 28 - 400MHz - -
New
RS Stock No. 216-6220
Mfr. Part No.871S1022EKLF
HK$127.23
Each
units
- - - - - - - VFQFPN-32 100 mA 32 - 100MHz - -
New
RS Stock No. 216-6266
Mfr. Part No.9FG104EGILFT
HK$31.407
Each (On a Reel of 2000)
units
- - - - - - - TSSOP 109 mA 28 - 400MHz - -
New
RS Stock No. 216-6135
Mfr. Part No.511MLFT
HK$12.165
Each (On a Reel of 3000)
units
- - - - Surface Mount - - SOIC 25 mA 8 - 200MHz - -
New
RS Stock No. 217-7876
Mfr. Part No.5V41068APGGI
HK$40.817
Each (In a Tube of 96)
units
Digital Synthesiser - - - Surface Mount 1 - TSSOP - 16 - - - -
New
RS Stock No. 217-7875
Mfr. Part No.5V41066PGGI
HK$33.486
Each (In a Pack of 5)
units
Digital Synthesiser - - 200MHz Surface Mount 4 - TSSOP - 20 - - - -
New
RS Stock No. 216-6219
Mfr. Part No.871S1022EKLF
HK$93.162
Each (In a Tray of 490)
units
- - - - - - - VFQFPN-32 100 mA 32 - 100MHz - -
New
RS Stock No. 216-6136
Mfr. Part No.511MLFT
HK$26.652
Each (In a Pack of 5)
units
- - - - Surface Mount - - SOIC 25 mA 8 - 200MHz - -
New
RS Stock No. 217-7874
Mfr. Part No.5V41066PGGI
HK$28.093
Each (In a Tube of 74)
units
Digital Synthesiser - - 200MHz Surface Mount 4 - TSSOP - 20 - - - -
New
RS Stock No. 217-7877
Mfr. Part No.5V41068APGGI
HK$48.745
Each (In a Pack of 2)
units
Digital Synthesiser - - - Surface Mount 1 - TSSOP - 16 - - - -