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庫存編號 103-5689
製造零件編號74HCT9046AD,112
BrandNexperia
TWD78.30
毎管:50 個
單位
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS庫存編號 483-6774
製造零件編號74HCT9046AD,112
BrandNexperia
TWD92.20
/個 (每包:5個)
單位
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS庫存編號 368-7521
製造零件編號HEF4046BT,652
BrandNexperia
TWD15.70
毎管:50 個
單位
- - - - Surface Mount 1 - SOIC - 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS庫存編號 483-6538
製造零件編號74HC4046AD,652
BrandNexperia
TWD19.60
/個 (每包:5個)
單位
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS庫存編號 178-6978
製造零件編號74HCT4046AD,112
BrandNexperia
TWD23.90
毎管:50 個
單位
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS庫存編號 178-6974
製造零件編號74HC4046AD,652
BrandNexperia
TWD16.00
毎管:50 個
單位
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm
RS庫存編號 483-6724
製造零件編號74HCT4046AD,112
BrandNexperia
TWD28.80
/個 (每包:5個)
單位
- - - - Surface Mount 1 - SOIC 50 mA 16 10 x 4 x 1.45mm - 1.45mm 10mm