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. 634-192
Mfr. Part No.CD74HCT297E
SGD3.52
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 697-7552
Mfr. Part No.ADF4107BRUZ
SGD10.38
Each
units
- - - - Surface Mount 1 - CP 20 - 16 5 x 4.4 x 1.05mm 7000MHz 1.05mm 5mm
RS Stock No. 662-4589
Mfr. Part No.CD74HC4046AE
SGD0.931
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. 160-3297
Mfr. Part No.HMC703LP4E
SGD39.49
Each (On a Reel of 50)
units
- - - - Surface Mount 1 - QFN 95 mA 24 4.1 x 4.1 x 0.95mm 8000MHz 0.95mm 4.1mm
RS Stock No. 161-2846
Mfr. Part No.Si5332B-C-GM2
SGD16.83
Each (In a Tray of 490)
units
- - - 200MHz 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. 806-3179
Mfr. Part No.MC14046BDWG
SGD1.323
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. 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. 817-5994
Mfr. Part No.CDCM61004RHBT
SGD12.88
1 Tape of 1
Tape(s)
- - - 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. 811-5759
Mfr. Part No.LMH1982SQE/NOPB
SGD44.02
Each
units
- - - 148.5MHz Surface Mount 1 - WQFN 70 mA 32 5 x 5 x 0.8mm 67.5MHz 0.8mm 5mm
RS Stock No. 759-1483
Mfr. Part No.AD9854ASVZ
SGD83.98
Each
units
Direct Synthesizer 300Msps 12 bit - Surface Mount - - TQFP - 80 16.2 x 16.2 x 1.2mm - 1.2mm 16.2mm
RS Stock No. 497-1760
Mfr. Part No.ADF4106BRUZ
SGD9.31
Each
units
- - - 325MHz Surface Mount 1 - CP 20 13 mA 16 5 x 4.4 x 1.05mm 6000MHz 1.05mm 5mm
RS Stock No. 802-2077
Mfr. Part No.NBC12439AMNG
SGD17.90
Each
units
- - - 800MHz Surface Mount 1 400MHz QFN 85 mA 32 5 x 5 x 0.95mm 20MHz 0.95mm 5mm
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. 145-4049
Mfr. Part No.NB3N51032DTG
SGD4.51
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. 163-2552
Mfr. Part No.NB3N2302DG
SGD2.92
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. 697-7495
Mfr. Part No.AD9910BSVZ
SGD95.48
Each
units
Digital Synthesizer 1000000ksps 14 bit - Surface Mount - - TQFP - 100 14 x 14 x 1mm - 1mm 14mm
RS Stock No. 161-2870
Mfr. Part No.Si5332A-C-GM1
SGD17.82
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. 186-9936
Mfr. Part No.FS6377-01IG-XTD
SGD15.90
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. 921-2820
Mfr. Part No.LMH1982SQE/NOPB
SGD37.371
Each (On a Reel of 250)
units
- - - 148.5MHz Surface Mount 1 - WQFN 70 mA 32 5 x 5 x 0.8mm 67.5MHz 0.8mm 5mm
RS Stock No. 709-5143
Mfr. Part No.ADF4156BRUZ
SGD9.86
Each
units
- - - - Surface Mount 1 - CP 20 1 32 mA 16 5 x 4.4 x 1.05mm 6000MHz 1.05mm 5mm