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. 189-7178
Mfr. Part No.DS1080LU+
SGD3.402
Each (In a Tube of 50)
units
- - - 134MHz Surface Mount 1 16MHz μSOP 15 mA 8 3.1 x 3.1 x 0.95mm 33.4MHz 0.95mm 3.1mm
RS Stock No. 912-6319
Mfr. Part No.AD9910BSVZ
SGD81.682
Each (In a Tray of 90)
units
Digital Synthesizer 1000000ksps 14 bit - Surface Mount - - TQFP - 100 14 x 14 x 1mm - 1mm 14mm
RS Stock No. 709-6020
Mfr. Part No.AD5934YRSZ
SGD33.10
Each
units
Digital Synthesizer 250ksps 12 bit - Surface Mount - - SSOP - 16 6.2 x 5.3 x 1.75mm - 1.75mm 6.2mm
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. 660-0520
Mfr. Part No.PLL1705DBQ
SGD8.00
Each
units
- - - - Surface Mount 2 - SSOP 25 mA 20 8.74 x 3.99 x 1.5mm 27MHz 1.5mm 8.74mm
RS Stock No. 162-8970
Mfr. Part No.NB3N3020DTG
SGD10.61
Each (In a Tube of 96)
units
- - - 210MHz Surface Mount 1 - TSSOP 75 mA 16 5.1 x 4.5 x 1.05mm 210MHz 1.05mm 5.1mm
RS Stock No. 192-1662
Mfr. Part No.DS1086Z+
SGD3.812
Each (In a Pack of 5)
units
- - - 133MHz Surface Mount 1 0MHz SOIC 35 mA 8 5 x 4 x 1.5mm 133MHz 1.5mm 5mm
RS Stock No. 538-4684
Mfr. Part No.ADF4112BRUZ
SGD10.69
Each
units
- - - - Surface Mount 1 - TSSOP 7.5 mA 16 5 x 4.4 x 1.05mm 3000MHz 1.05mm 5mm
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. 787-6930
Mfr. Part No.NB3N5573DTG
SGD7.19
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. 759-2749
Mfr. Part No.ADF4350BCPZ
SGD20.36
Each
units
- - - 4400MHz Surface Mount 2 137.5MHz LFCSP VQ 110 mA 32 5 x 5 x 1mm 4400MHz 1mm 5mm
RS Stock No. 709-6011
Mfr. Part No.AD5930YRUZ
SGD22.75
Each
units
- - - - Surface Mount - - TSSOP - 20 6.5 x 7.6 x 1.05mm - 1.05mm 6.5mm