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. 538-5378
Mfr. Part No.AD9859YSVZ
SGD36.33
Each
units
Digital Synthesizer 400Msps 10 bit - Surface Mount - - TQFP - 48 7 x 7 x 1mm - 1mm 7mm
RS Stock No. 162-5219
Mfr. Part No.PLL1705DBQ
SGD7.199
Each (In a Tube of 50)
units
- - - - Surface Mount 2 - SSOP 25 mA 20 8.74 x 3.99 x 1.5mm 27MHz 1.5mm 8.74mm
RS Stock No. 620-2173
Mfr. Part No.CDCVF25084PW
SGD18.10
Each
units
- - - 180MHz Surface Mount 1 10MHz TSSOP - 16 5 x 4.4 x 1.15mm 45MHz 1.15mm 5mm
RS Stock No. 827-0673
Mfr. Part No.NB3N51032DTG
SGD6.53
Each (In a Pack of 2)
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. 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. 796-8710
Mfr. Part No.ADF4351BCPZ
SGD24.08
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. 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. 169-8384
Mfr. Part No.CS2000CP-CZZ
SGD10.82
Each (In a Tube of 96)
units
- - - 75MHz Surface Mount 1 6MHz MSOP 18 mA 10 3 x 3 x 0.95mm 30MHz 0.95mm 3mm
RS Stock No. 162-4651
Mfr. Part No.CDCVF25084PW
SGD15.078
Each (In a Tube of 90)
units
- - - 180MHz Surface Mount 1 10MHz TSSOP - 16 5 x 4.4 x 1.15mm 45MHz 1.15mm 5mm
RS Stock No. 170-3521
Mfr. Part No.NB3N5573DTG
SGD5.98
Each (In a Tube of 96)
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. 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. 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
RS Stock No. 787-6920
Mfr. Part No.NB3N502DG
SGD6.375
Each (In a Pack of 2)
units
- - - 190MHz Surface Mount 1 14MHz SOIC 20 mA 8 5 x 4 x 1.5mm 50MHz 1.5mm 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. 807-1798
Mfr. Part No.ADF4159CCPZ
SGD23.71
Each
units
- - - 2GHz Surface Mount 1 - LFCSP 40 mA 24 4.1 x 4.1 x 0.75mm 13GHz 0.75mm 4.1mm
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. 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. 807-1791
Mfr. Part No.ADF4153YRUZ
SGD12.28
Each
units
- - - 1750MHz Surface Mount 1 - TSSOP 24 mA 16 5.1 x 4.5 x 1.05mm 4GHz 1.05mm 5.1mm
RS Stock No. 161-2839
Mfr. Part No.Si52204-A01AGM
SGD1.883
Each (In a Tube of 60)
units
- - - 100MHz Surface Mount 3 - QFN 44 mA 32 5 x 5 x 0.85mm 25MHz 0.85mm 5mm
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