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 145-6056
製造零件編號SN74LV4046AN
HK$11.896
毎管:25 個
單位
- - - 38MHz Through Hole - - PDIP ±70 mA 16 19.69 x 6.6 x 4.57mm - 4.57mm 19.69mm
RS庫存編號 809-5927
製造零件編號SN74LV4046AN
HK$555.43
/個 (每包:5個)
單位
- - - 38MHz Through Hole - - PDIP ±70 mA 16 19.69 x 6.6 x 4.57mm - 4.57mm 19.69mm
RS庫存編號 923-6693
製造零件編號CD4046BE
HK$4.893
毎管:25 個
單位
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS庫存編號 709-1965
製造零件編號CD4046BE
HK$4.893
/個 (每包:10個)
單位
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS庫存編號 162-6951
製造零件編號CD74HC4046AM96
HK$2.142
個 (在毎卷:2500)
單位
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS庫存編號 662-3961
製造零件編號CD74HC4046AM96
HK$4.883
/個 (每包:10個)
單位
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS庫存編號 660-7755
製造零件編號PLL1708DBQ
HK$50.59
單位
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS庫存編號 809-6191
製造零件編號CD4046BPW
HK$4.419
/個 (每包:15個)
單位
- - - 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庫存編號 662-4586
製造零件編號CD74HC7046AM
HK$27.94
/個 (每包:5個)
單位
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS庫存編號 817-5537
製造零件編號TRF3765IRHBT
HK$141.33
單位
- - - 4800MHz Surface Mount - 300MHz VQFN 190 mA 32 5.15 x 5.15 x 0.95mm 350MHz 0.95mm 5.15mm
RS庫存編號 660-0520
製造零件編號PLL1705DBQ
HK$49.59
單位
- - - - Surface Mount 2 - SSOP 25 mA 20 8.74 x 3.99 x 1.5mm 27MHz 1.5mm 8.74mm
RS庫存編號 178-9154
製造零件編號CD74HCT4046AM
HK$4.12
毎管:40 個
單位
- - - - Surface Mount 1 - SOIC - 16 9.9 x 3.91 x 1.58mm - 1.58mm 9.9mm
RS庫存編號 162-5220
製造零件編號PLL1708DBQ
HK$42.504
毎管:50 個
單位
- - - - Surface Mount 2 - SSOP 25 mA 20 8.75 x 4 x 1.5mm 27.27MHz 1.5mm 8.75mm
RS庫存編號 761-6438
製造零件編號LMX2485ESQ/NOPB
HK$55.06
1 Tape of 1 Pack(s)
Tape(s)
- - - 3000MHz Surface Mount 3 50MHz WQFN 5 mA 24 4 x 4 x 0.8mm 110 MHz, 800MHz 0.8mm 4mm
RS庫存編號 162-4153
製造零件編號CD74HCT7046AE
HK$24.35
毎管:25 個
單位
- - - - Through Hole 1 - PDIP - 16 19.3 x 6.35 x 4.57mm - 4.57mm 19.3mm
RS庫存編號 817-5994
製造零件編號CDCM61004RHBT
HK$81.49
1 Tape of 1 Pack(s)
Tape(s)
- - - 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庫存編號 922-2243
製造零件編號LMX2485ESQ/NOPB
HK$30.915
個 (在毎卷:1000)
單位
- - - 3000MHz Surface Mount 3 50MHz LLP 5 mA 24 4 x 4 x 0.8mm 110 MHz, 800MHz 0.8mm 4mm
RS庫存編號 709-2508
製造零件編號TLC2932AIPW
HK$41.51
單位
- - - - Surface Mount 1 - TSSOP - 14 5 x 4.4 x 1.15mm - 1.15mm 5mm
RS庫存編號 817-5985
製造零件編號CDCM61002RHBT
HK$63.42
單位
- - - 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庫存編號 162-7733
製造零件編號LMK03806BISQE/NOPB
HK$97.934
個 (在毎卷:250)
單位
- - - 312.5MHz Surface Mount 1 - WQFN 445 mA 64 9.1 x 9.1 x 0.8mm 500MHz 0.8mm 9.1mm