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. 809-9705
Mfr. Part No.AD9837ACPZ-RL7
MYR17.52
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. 796-0344
Mfr. Part No.Si5356A-B-GM
MYR21.19
Each (In a Pack of 2)
units
- - - 200MHz Surface Mount - 1MHz QFN 60 mA 24 4 x 4 x 0.85mm 200MHz 0.85mm 4mm
RS Stock No. 811-5787
Mfr. Part No.LMK03806BISQE/NOPB
MYR64.06
Each
units
- - - 312.5MHz Surface Mount 1 - WQFN 445 mA 64 9.1 x 9.1 x 0.8mm 500MHz 0.8mm 9.1mm
RS Stock No. 806-3179
Mfr. Part No.MC14046BDWG
MYR3.652
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. 709-4807
Mfr. Part No.AD5932YRUZ
MYR47.16
Each
units
- - - - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 162-6951
Mfr. Part No.CD74HC4046AM96
MYR1.344
Each (On a Reel of 2500)
units
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS Stock No. 709-1965
Mfr. Part No.CD4046BE
MYR2.384
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. 662-3961
Mfr. Part No.CD74HC4046AM96
MYR2.373
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. 923-6693
Mfr. Part No.CD4046BE
MYR1.59
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. 912-8217
Mfr. Part No.AD9837ACPZ-RL7
MYR12.917
Each (On a Reel of 1500)
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. 168-9977
Mfr. Part No.SI5356A-B-GM
MYR20.517
Each (In a Tray of 75)
units
- - - 200MHz Surface Mount - 1MHz QFN 60 mA 24 4 x 4 x 0.85mm 200MHz 0.85mm 4mm
RS Stock No. 145-2977
Mfr. Part No.MC14046BDWG
MYR2.968
Each (In a Tube of 47)
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. 162-7733
Mfr. Part No.LMK03806BISQE/NOPB
MYR49.43
Each (On a Reel of 250)
units
- - - 312.5MHz Surface Mount 1 - WQFN 445 mA 64 9.1 x 9.1 x 0.8mm 500MHz 0.8mm 9.1mm
RS Stock No. 697-7476
Mfr. Part No.AD9852ASVZ
MYR254.70
Each
units
Direct Digital Synthesizer 300Msps 12 bit - Surface Mount - - TQFP - 80 14 x 14 x 1mm - 1mm 14mm
RS Stock No. 178-9154
Mfr. Part No.CD74HCT4046AM
MYR1.719
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. 709-7547
Mfr. Part No.ADF4116BRUZ
MYR26.16
Each
units
- - - - Surface Mount 1 - TSSOP 5.5 mA 16 5 x 4.4 x 1.05mm 550MHz 1.05mm 5mm
RS Stock No. 162-4651
Mfr. Part No.CDCVF25084PW
MYR37.32
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. 161-2872
Mfr. Part No.Si5332A-C-GM2
MYR51.33
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. 161-2853
Mfr. Part No.Si5332D-C-GM3
MYR36.893
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. 483-6774
Mfr. Part No.74HCT9046AD,112
BrandNexperia
MYR11.518
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm