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. 178-6974
Mfr. Part No.74HC4046AD,652
BrandNexperia
SGD0.846
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 483-6538
Mfr. Part No.74HC4046AD,652
BrandNexperia
SGD0.906
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 496-9616
Mfr. Part No.AD9858BSVZ
SGD127.08
Each
units
Digital Synthesizer 1000000ksps 10 bit - Surface Mount - - TQFP - 100 14 x 14 x 1mm - 1mm 14mm
RS Stock No. 162-6951
Mfr. Part No.CD74HC4046AM96
SGD0.327
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. 662-3961
Mfr. Part No.CD74HC4046AM96
SGD0.725
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. 811-5787
Mfr. Part No.LMK03806BISQE/NOPB
SGD20.81
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. 162-7733
Mfr. Part No.LMK03806BISQE/NOPB
SGD14.298
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. 496-9947
Mfr. Part No.AD9834BRUZ
SGD16.22
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. 168-9977
Mfr. Part No.SI5356A-B-GM
SGD6.736
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. 523-7869
Mfr. Part No.AD9832BRUZ
SGD18.04
Each
units
Digital Synthesizer 25000ksps 10 bit - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 759-1506
Mfr. Part No.AD9912ABCPZ
SGD97.10
Each
units
Direct Synthesizer 1Gsps 14 bit - Surface Mount - - LFCSP VQ - 64 9.1 x 9.1 x 0.8mm - 1mm 9.1mm
RS Stock No. 796-0344
Mfr. Part No.Si5356A-B-GM
SGD8.41
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. 708-9375
Mfr. Part No.AD9958BCPZ
SGD60.50
Each
units
Digital Synthesizer 500Msps 10 bit - Surface Mount - - LFCSP - 56 8 x 8 x 0.83mm - 0.83mm 8mm
RS Stock No. 650-122
Mfr. Part No.CD74HCT7046AE
SGD3.68
Each
units
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS Stock No. 160-2676
Mfr. Part No.HMC832LP6GE
SGD26.73
Each (On a Reel of 50)
units
- - - 3000MHz Surface Mount 1 25MHz SMD 237 mA 40 6.1 x 6.1 x 0.9mm 3000MHz 0.9mm 6.1mm
RS Stock No. 862-6458
Mfr. Part No.HMC830LP6GE
SGD30.88
Each
units
- - - 3000MHz Surface Mount 1 25MHz QFN 105 mA 40 6.1 x 6.1 x 0.9mm 3000MHz 0.9mm 6.1mm
RS Stock No. 709-4816
Mfr. Part No.AD5933YRSZ
SGD52.61
Each
units
Impedance Converter 1MHz 12 bit - Surface Mount - - SSOP - 16 6.2 x 5.3 x 1.75mm - 1.75mm 6.2mm
RS Stock No. 103-5689
Mfr. Part No.74HCT9046AD,112
BrandNexperia
SGD3.48
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 162-4153
Mfr. Part No.CD74HCT7046AE
SGD3.46
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. 759-1503
Mfr. Part No.AD9911BCPZ
SGD51.99
Each
units
Direct Synthesizer 500Msps 32 bit - Surface Mount - - LFCSP VQ - 56 8 x 8 x 1mm - 1mm 8mm