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. 865-2270
Mfr. Part No.ADF5355BCPZ
$103.65
Each
units
- - - 13600MHz Surface Mount 3 54MHz LFCSP 85 mA 32 5.1 x 5.1 x 0.75mm 600MHz 0.75mm 5.1mm
RS Stock No. 145-0657
Mfr. Part No.CD74HC4046AE
$0.85
Each (In a Tube of 25)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 662-4589
Mfr. Part No.CD74HC4046AE
$0.849
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. 483-6774
Mfr. Part No.74HCT9046AD,112
BrandNexperia
$3.874
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 103-5689
Mfr. Part No.74HCT9046AD,112
BrandNexperia
$3.293
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 523-7162
Mfr. Part No.ADF4001BRUZ
$9.85
Each
units
- - - - Surface Mount 1 - CP 20 5.5 mA 16 5 x 4.4 x 1.05mm 200MHz 1.05mm 5mm
RS Stock No. 496-9616
Mfr. Part No.AD9858BSVZ
$131.46
Each
units
Digital Synthesizer 1000000ksps 10 bit - Surface Mount - - TQFP - 100 14 x 14 x 1mm - 1mm 14mm
RS Stock No. 796-8710
Mfr. Part No.ADF4351BCPZ
$22.68
Each
units
- - - 4400MHz Surface Mount 1 35MHz LFCSP 27 mA 32 5 x 4.75 x 0.95mm 250MHz 0.95mm 5mm
RS Stock No. 709-4807
Mfr. Part No.AD5932YRUZ
$16.22
Each
units
- - - - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 412-309
Mfr. Part No.AD9835BRUZ
$23.17
Each
units
Digital Synthesizer 50Msps 10 bit - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 923-6693
Mfr. Part No.CD4046BE
$0.795
Each (In a Tube of 25)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 787-6930
Mfr. Part No.NB3N5573DTG
$7.17
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. 709-7559
Mfr. Part No.ADF4118BRUZ
$9.77
Each
units
- - - - Surface Mount 1 - TSSOP 7.5 mA 16 5 x 4.4 x 1.05mm 3000MHz 1.05mm 5mm
RS Stock No. 709-1965
Mfr. Part No.CD4046BE
$0.795
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. 650-122
Mfr. Part No.CD74HCT7046AE
$4.26
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 538-5384
Mfr. Part No.AD9952YSVZ
$50.42
Each
units
Digital Synthesizer 400Msps 14 bit - Surface Mount - - TQFP - 48 7 x 7 x 1mm - 1mm 7mm
RS Stock No. 880-6976
Mfr. Part No.Si5341A-D-GM
$35.47
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. 162-4153
Mfr. Part No.CD74HCT7046AE
$3.843
Each (In a Tube of 25)
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 145-5203
Mfr. Part No.FS7140-02G-XTD
$9.544
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. 801-0248
Mfr. Part No.FS7140-02G-XTD
$11.09
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