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. 912-8217
Mfr. Part No.AD9837ACPZ-RL7
R 40.268
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. 809-9705
Mfr. Part No.AD9837ACPZ-RL7
R 73.175
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. 412-933
Mfr. Part No.AD9850BRSZ
R 454.87
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. 709-1965
Mfr. Part No.CD4046BE
R 7.871
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. 709-6011
Mfr. Part No.AD5930YRUZ
R 241.05
Each
units
- - - - Surface Mount - - TSSOP - 20 6.5 x 7.6 x 1.05mm - 1.05mm 6.5mm
RS stock no. 923-6693
Mfr. Part No.CD4046BE
R 7.799
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. 709-4807
Mfr. Part No.AD5932YRUZ
R 180.65
Each
units
- - - - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS stock no. 168-5010
Mfr. Part No.LMX2581SQE/NOPB
R 130.932
Each (On a Reel of 250)
units
- - - 3760MHz Surface Mount 4 50MHz WQFN 134 mA 32 5 x 5 x 0.8mm 900MHz 0.8mm 5mm
RS stock no. 709-6020
Mfr. Part No.AD5934YRSZ
R 359.06
Each
units
Digital Synthesizer 250ksps 12 bit - Surface Mount - - SSOP - 16 6.2 x 5.3 x 1.75mm - 1.75mm 6.2mm
RS stock no. 708-9934
Mfr. Part No.AD9854ASTZ
R 709.72
Each
units
Digital Synthesizer 200Msps 12 bit - Surface Mount - - LQFP - 80 14 x 14 x 1.4mm - 1.4mm 14mm
RS stock no. 133-0680
Mfr. Part No.LMX2581SQE/NOPB
R 134.26
Each
units
- - - 3760MHz Surface Mount 4 50MHz WQFN 134 mA 32 5 x 5 x 0.8mm 900MHz 0.8mm 5mm
RS stock no. 413-011
Mfr. Part No.AD9851BRSZ
R 498.52
Each
units
Digital Synthesizer 180000ksps 10 bit - Surface Mount - - SSOP - 28 10.2 x 5.3 x 1.75mm - 1.75mm 10.2mm
RS stock no. 809-9364
Mfr. Part No.AD9838BCPZ-RL7
R 101.41
Each
units
Direct Synthesizer 16Msps 10 bit 16MHz Surface Mount - - LFCSP WD - 20 4.1 x 4.1 x 0.75mm - 0.75mm 4.1mm
RS stock no. 496-7812
Mfr. Part No.AD9951YSVZ
R 490.37
Each
units
Digital Synthesizer 400Msps 14 bit - Surface Mount - - TQFP - 48 7 x 7 x 1mm - 1mm 7mm
RS stock no. 145-3853
Mfr. Part No.NB3N502DG
R 45.233
Each (In a Tube of 98)
units
- - - 190MHz Surface Mount 1 14MHz SOIC 20 mA 8 5 x 4 x 1.5mm 50MHz 1.5mm 5mm
RS stock no. 709-4816
Mfr. Part No.AD5933YRSZ
R 584.41
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. 787-6920
Mfr. Part No.NB3N502DG
R 53.285
Each (In a Pack of 2)
units
- - - 190MHz Surface Mount 1 14MHz SOIC 20 mA 8 5 x 4 x 1.5mm 50MHz 1.5mm 5mm
RS stock no. 412-309
Mfr. Part No.AD9835BRUZ
R 496.99
Each
units
Digital Synthesizer 50Msps 10 bit - Surface Mount - - TSSOP - 16 5 x 4.4 x 1.05mm - 1.05mm 5mm
RS stock no. 523-7162
Mfr. Part No.ADF4001BRUZ
R 76.62
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. 697-7561
Mfr. Part No.ADF4360-8BCPZ
R 120.38
Each
units
Integrated Synthesizer - - - Surface Mount - - LFCSP - 24 4 x 4 x 0.83mm - 0.83mm 4mm