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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Omschrijving Prijs 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-stocknr. 178-9154
FabrikantnummerCD74HCT4046AM
€ 0,398
Each (In a Tube of 40)
Aantal stuks
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS-stocknr. 709-1965
FabrikantnummerCD4046BE
€ 0,487
Each (In a Pack of 10)
Aantal stuks
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS-stocknr. 662-4595
FabrikantnummerCD74HCT4046AM
€ 0,447
Each (In a Pack of 10)
Aantal stuks
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS-stocknr. 923-6693
FabrikantnummerCD4046BE
€ 0,455
Each (In a Tube of 25)
Aantal stuks
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS-stocknr. 145-6056
FabrikantnummerSN74LV4046AN
€ 0,567
Each (In a Tube of 25)
Aantal stuks
- - - 38MHz Through Hole - - PDIP ±70 mA 16 19.69 x 6.6 x 4.57mm - 4.57mm 19.69mm
RS-stocknr. 100-0740
FabrikantnummerCD74HCT297E
€ 1,404
Each (In a Tube of 25)
Aantal stuks
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS-stocknr. 650-122
FabrikantnummerCD74HCT7046AE
€ 2,65
Each
Aantal stuks
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS-stocknr. 162-8142
FabrikantnummerCDCM61002RHBT
€ 4,479
Each (On a Reel of 250)
Aantal stuks
- - - 683.264MHz Surface Mount 2 43.75MHz VQFN 65 mA 32 5.15 x 5.15 x 0.95mm 28.47MHz 0.95mm 5.15mm
RS-stocknr. 809-5927
FabrikantnummerSN74LV4046AN
€ 0,572
Each (In a Pack of 5)
Aantal stuks
- - - 38MHz Through Hole - - PDIP ±70 mA 16 19.69 x 6.6 x 4.57mm - 4.57mm 19.69mm
RS-stocknr. 634-192
FabrikantnummerCD74HCT297E
€ 3,11
Each
Aantal stuks
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS-stocknr. 162-4153
FabrikantnummerCD74HCT7046AE
€ 2,258
Each (In a Tube of 25)
Aantal stuks
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS-stocknr. 817-5985
FabrikantnummerCDCM61002RHBT
€ 6,15
Each
Aantal stuks
- - - 683.264MHz Surface Mount 2 43.75MHz VQFN 65 mA 32 5.15 x 5.15 x 0.95mm 28.47MHz 0.95mm 5.15mm
RS-stocknr. 162-8143
FabrikantnummerCDCM61004RHBT
€ 5,804
Each (On a Reel of 250)
Aantal stuks
- - - 683.264MHz Surface Mount 4 43.75MHz VQFN 65 mA 32 5.15 x 5.15 x 0.95mm 28.47MHz 0.95mm 5.15mm
RS-stocknr. 921-2820
FabrikantnummerLMH1982SQE/NOPB
€ 15,595
Each (On a Reel of 250)
Aantal stuks
- - - 148.5MHz Surface Mount 1 - WQFN 70 mA 32 5 x 5 x 0.8mm 67.5MHz 0.8mm 5mm
RS-stocknr. 811-5787
FabrikantnummerLMK03806BISQE/NOPB
€ 6,90
Each
Aantal stuks
- - - 312.5MHz Surface Mount 1 - WQFN 445 mA 64 9.1 x 9.1 x 0.8mm 500MHz 0.8mm 9.1mm
RS-stocknr. 660-7755
FabrikantnummerPLL1708DBQ
€ 2,10
Each
Aantal stuks
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS-stocknr. 709-2637
FabrikantnummerPLL1707DBQ
€ 5,05
Each
Aantal stuks
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS-stocknr. 817-5537
FabrikantnummerTRF3765IRHBT
€ 13,81
Each
Aantal stuks
- - - 4800MHz Surface Mount - 300MHz VQFN 190 mA 32 5.15 x 5.15 x 0.95mm 350MHz 0.95mm 5.15mm
RS-stocknr. 922-2243
FabrikantnummerLMX2485ESQ/NOPB
€ 3,002
Each (On a Reel of 1000)
Aantal stuks
- - - 3000MHz Surface Mount 3 50MHz LLP 5 mA 24 4 x 4 x 0.8mm 110 MHz, 800MHz 0.8mm 4mm
RS-stocknr. 662-3961
FabrikantnummerCD74HC4046AM96
€ 0,447
Each (In a Pack of 10)
Aantal stuks
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm