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. 697-7476
Mfr. Part No.AD9852ASVZ
SGD77.01
Each
units
Direct Digital Synthesizer 300Msps 12 bit - Surface Mount - - TQFP - 80 14 x 14 x 1mm - 1mm 14mm
RS Stock No. 183-2473
Mfr. Part No.HMC834LP6GE
SGD35.93
Each
units
- - - 8400MHz Surface Mount 1 45MHz SMT 8 mA 40 6.1 x 6.1 x 0.85mm 4200MHz 0.85mm 6.1mm
RS Stock No. 160-2675
Mfr. Part No.HMC822LP6CE
SGD22.33
Each (On a Reel of 50)
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. 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. 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. 145-1118
Mfr. Part No.CD4046BPW
SGD0.552
Each (In a Tube of 90)
units
- - - 1.6 MHz, 2.4 MHz Surface Mount 1 0.8 MHz, 1.4 MHz TSSOP 0.1 → 1 μA 16 5.1 x 4.5 x 1.05mm 1.4MHz 1.05mm 5.1mm
RS Stock No. 161-2843
Mfr. Part No.Si5332A-C-GM2
SGD18.68
Each (In a Tray of 490)
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. 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. 523-7162
Mfr. Part No.ADF4001BRUZ
SGD6.82
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. 161-2866
Mfr. Part No.Si52204-A01AGM
SGD4.40
Each (In a Pack of 2)
units
- - - 100MHz Surface Mount 3 - QFN 44 mA 32 5 x 5 x 0.85mm 25MHz 0.85mm 5mm
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. 145-6969
Mfr. Part No.CD74HC7046AM
SGD3.927
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. 100-0740
Mfr. Part No.CD74HCT297E
SGD4.56
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. 922-2243
Mfr. Part No.LMX2485ESQ/NOPB
SGD4.876
Each (On a Reel of 1000)
units
- - - 3000MHz Surface Mount 3 50MHz LLP 5 mA 24 4 x 4 x 0.8mm 110 MHz, 800MHz 0.8mm 4mm
New
RS Stock No. 217-7877
Mfr. Part No.5V41068APGGI
SGD6.995
Each (In a Pack of 2)
units
Digital Synthesiser - - - Surface Mount 1 - TSSOP - 16 - - - -
RS Stock No. 809-9705
Mfr. Part No.AD9837ACPZ-RL7
SGD6.39
Each (In a Pack of 2)
units
Direct Synthesizer 16Msps 10 bit 5MHz Surface Mount - - LFCSP WD - 10 3.1 x 3.1 x 0.8mm - 0.8mm 3.1mm
RS Stock No. 807-1776
Mfr. Part No.ADF4151BCPZ
SGD9.25
Each
units
- - - 750MHz Surface Mount 1 - LFCSP 50 mA 32 5.1 x 5.1 x 0.75mm 3.5GHz 0.75mm 5.1mm
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. 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. 192-1207
Mfr. Part No.DS1086Z+
SGD2.997
Each (In a Tube of 100)
units
- - - 133MHz Surface Mount 1 0MHz SOIC 35 mA 8 5 x 4 x 1.5mm 133MHz 1.5mm 5mm