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. 708-9782
Mfr. Part No.ADF4360-9BCPZ
SGD10.69
Each
units
- - - 400MHz Surface Mount 1 1.1MHz CP 24 2 5 mA 24 4 x 4 x 0.83mm 250MHz 0.83mm 4mm
RS Stock No. 145-0657
Mfr. Part No.CD74HC4046AE
SGD0.932
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. 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. 189-8648
Mfr. Part No.DS1080LU+
SGD3.846
Each (In a Pack of 5)
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. 186-9936
Mfr. Part No.FS6377-01IG-XTD
SGD15.90
Each
units
- - - 150MHz Surface Mount 4 0.8MHz SOIC 43 mA 16 9.98 x 3.99 x 1.55mm 230MHz 1.55mm 9.98mm
RS Stock No. 186-9049
Mfr. Part No.FS6377-01IG-XTD
SGD14.02
Each (In a Tube of 48)
units
- - - 150MHz Surface Mount 4 0.8MHz SOIC 43 mA 16 9.98 x 3.99 x 1.55mm 230MHz 1.55mm 9.98mm
RS Stock No. 538-4684
Mfr. Part No.ADF4112BRUZ
SGD12.62
Each
units
- - - - Surface Mount 1 - TSSOP 7.5 mA 16 5 x 4.4 x 1.05mm 3000MHz 1.05mm 5mm
RS Stock No. 761-6438
Mfr. Part No.LMX2485ESQ/NOPB
SGD8.68
1 Tape of 1
Tape(s)
- - - 3000MHz Surface Mount 3 50MHz WQFN 5 mA 24 4 x 4 x 0.8mm 110 MHz, 800MHz 0.8mm 4mm
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. 796-0101
Mfr. Part No.Si5326C-C-GM
SGD43.15
Each
units
- - - 346MHz Surface Mount 4 2kHz QFN 279 mA 36 6 x 6 x 0.85mm 710MHz 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. 801-0248
Mfr. Part No.FS7140-02G-XTD
SGD11.79
Each (In a Pack of 2)
units
- - - 150 MHz, 300MHz Surface Mount 1 0MHz SSOP 35 mA 16 6.33 x 5.38 x 1.78mm 35MHz 1.78mm 6.33mm
RS Stock No. 538-5930
Mfr. Part No.AD9954YSVZ
SGD55.19
Each
units
Digital Synthesizer 400Msps 14 bit - Surface Mount - - TQFP - 48 7 x 7 x 1mm - 1mm 7mm
New
RS Stock No. 216-6267
Mfr. Part No.9FG104EGILFT
SGD10.80
Each (In a Pack of 2)
units
- - - - - - - TSSOP 109 mA 28 - 400MHz - -
RS Stock No. 697-7495
Mfr. Part No.AD9910BSVZ
SGD100.80
Each
units
Digital Synthesizer 1000000ksps 14 bit - Surface Mount - - TQFP - 100 14 x 14 x 1mm - 1mm 14mm
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. 807-1599
Mfr. Part No.AD9914BCPZ
SGD358.91
Each
units
Direct Synthesizer 3.5Gsps 12 bit 1750MHz Surface Mount - - LFCSP VQ - 88 12.1 x 12.1 x 0.86mm - 0.86mm 12.1mm
RS Stock No. 368-7521
Mfr. Part No.HEF4046BT,652
BrandNexperia
SGD0.623
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 923-6778
Mfr. Part No.TLC2932AIPW
SGD5.89
Each (In a Tube of 90)
units
- - - - Surface Mount 1 - TSSOP - 14 5 x 4.4 x 1.15mm - 1.15mm 5mm
RS Stock No. 161-2842
Mfr. Part No.Si5332A-C-GM1
SGD15.931
Each (In a Tray of 490)
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