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. 709-0069
Mfr. Part No.ADF4107BCPZ
SGD9.51
Each
units
- - - - Surface Mount 1 - CP 20 - 20 4 x 4 x 0.83mm 7000MHz 0.83mm 4mm
RS Stock No. 523-7516
Mfr. Part No.AD9831ASTZ
SGD23.24
Each
units
Digital Synthesizer 25000ksps 10 bit - Surface Mount - - LQFP - 48 7 x 7 x 1.4mm - 1.4mm 7mm
RS Stock No. 759-1506
Mfr. Part No.AD9912ABCPZ
SGD97.10
Each
units
Direct Synthesizer 1Gsps 14 bit - Surface Mount - - LFCSP VQ - 64 9.1 x 9.1 x 0.8mm - 1mm 9.1mm
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. 412-933
Mfr. Part No.AD9850BRSZ
SGD43.45
Each
units
Digital Synthesizer 125000ksps 10 bit - Surface Mount - - SSOP - 28 10.2 x 5.3 x 1.75mm - 1.75mm 10.2mm
RS Stock No. 709-4816
Mfr. Part No.AD5933YRSZ
SGD55.88
Each
units
Impedance Converter 1MHz 12 bit - Surface Mount - - SSOP - 16 6.2 x 5.3 x 1.75mm - 1.75mm 6.2mm
RS Stock No. 178-9154
Mfr. Part No.CD74HCT4046AM
SGD0.725
Each (In a Tube of 40)
units
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS Stock No. 412-715
Mfr. Part No.ADF4153BRUZ
SGD9.59
Each
units
- - - - Surface Mount 1 - CP 20 24 mA 16 5 x 4.4 x 1.05mm 4000MHz 1.05mm 5mm
RS Stock No. 161-2848
Mfr. Part No.Si5332C-C-GM1
SGD10.016
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. 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. 145-3624
Mfr. Part No.NBC12439AMNG
SGD14.16
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. 697-7561
Mfr. Part No.ADF4360-8BCPZ
SGD11.66
Each
units
Integrated Synthesizer - - - Surface Mount - - LFCSP - 24 4 x 4 x 0.83mm - 0.83mm 4mm
RS Stock No. 162-8143
Mfr. Part No.CDCM61004RHBT
SGD9.04
Each (On a Reel of 250)
units
- - - 683.264MHz Surface Mount 4 43.75MHz VQFN 65 mA 32 5.15 x 5.15 x 0.95mm 28.47MHz 0.95mm 5.15mm
RS Stock No. 709-7461
Mfr. Part No.AD9834CRUZ
SGD20.60
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. 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. 862-6234
Mfr. Part No.HMC822LP6CE
SGD27.49
Each
units
- - - 3300MHz Surface Mount 1 2660MHz QFN 56 mA 40 6.1 x 6.1 x 0.9mm 1650MHz 0.9mm 6.1mm
RS Stock No. 162-5220
Mfr. Part No.PLL1708DBQ
SGD7.342
Each (In a Tube of 50)
units
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS Stock No. 161-2853
Mfr. Part No.Si5332D-C-GM3
SGD11.529
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. 709-5137
Mfr. Part No.ADF4002BRUZ
SGD6.48
Each
units
- - - - Surface Mount 1 - CP 20 1 6 mA 16 5 x 4.4 x 1.05mm 400MHz 1.05mm 5mm
RS Stock No. 662-4595
Mfr. Part No.CD74HCT4046AM
SGD0.844
Each (In a Pack of 10)
units
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm