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. 412-309
Mfr. Part No.AD9835BRUZ
$22.76
Each
units
Digital Synthesizer 50Msps 10 bit - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 709-4807
Mfr. Part No.AD5932YRUZ
$17.80
Each
units
- - - - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 662-4589
Mfr. Part No.CD74HC4046AE
$0.968
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. 709-1965
Mfr. Part No.CD4046BE
$0.881
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. 662-4586
Mfr. Part No.CD74HC7046AM
$5.58
Each (In a Pack of 5)
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
$0.881
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. 145-6969
Mfr. Part No.CD74HC7046AM
$4.095
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. 145-0657
Mfr. Part No.CD74HC4046AE
$0.968
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. 709-6011
Mfr. Part No.AD5930YRUZ
$24.20
Each
units
- - - - Surface Mount - - TSSOP - 20 6.5 x 7.6 x 1.05mm - 1.05mm 6.5mm
RS Stock No. 145-5203
Mfr. Part No.FS7140-02G-XTD
$10.36
Each (In a Tube of 76)
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. 809-6191
Mfr. Part No.CD4046BPW
$0.583
Each (In a Pack of 15)
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. 169-8383
Mfr. Part No.CS2300-CP-CZZ
$8.69
Each (In a Tube of 96)
units
- - - 75MHz Surface Mount 1 6MHz MSOP ±10 mA 10 3 x 3 x 0.95mm 30MHz 0.95mm 3mm
RS Stock No. 103-5689
Mfr. Part No.74HCT9046AD,112
BrandNexperia
$3.738
Each (In a Tube of 50)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 523-7869
Mfr. Part No.AD9832BRUZ
$20.17
Each
units
Digital Synthesizer 25000ksps 10 bit - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS Stock No. 162-4153
Mfr. Part No.CD74HCT7046AE
$4.378
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. 801-0248
Mfr. Part No.FS7140-02G-XTD
$12.03
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. 483-6774
Mfr. Part No.74HCT9046AD,112
BrandNexperia
$4.01
Each (In a Pack of 5)
units
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS Stock No. 412-933
Mfr. Part No.AD9850BRSZ
$45.81
Each
units
Digital Synthesizer 125000ksps 10 bit - Surface Mount - - SSOP - 28 10.2 x 5.3 x 1.75mm - 1.75mm 10.2mm
RS Stock No. 716-5804
Mfr. Part No.CS2300-CP-CZZ
$11.96
Each
units
- - - 75MHz Surface Mount 1 6MHz MSOP ±10 mA 10 3 x 3 x 0.95mm 30MHz 0.95mm 3mm
RS Stock No. 145-1118
Mfr. Part No.CD4046BPW
$0.582
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