Clock Synthesizer | PLL & Direct Digital | RS
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    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.

    100 產品顯示為 Clock Synthesizers

    Infineon
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    -
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    -
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    onsemi
    -
    -
    -
    190MHz
    Surface Mount
    1
    14MHz
    SOIC
    20 mA
    8
    5 x 4 x 1.5mm
    50MHz
    1.5mm
    5mm
    5.5 V
    +85 °C
    3 V
    -40 °C
    Texas Instruments
    -
    -
    -
    -
    Through Hole
    1
    -
    PDIP
    -
    16
    19.3 x 6.35 x 4.57mm
    -
    4.57mm
    19.3mm
    5.5 V
    +125 °C
    4.5 V
    -55 °C
    onsemi
    -
    -
    -
    210MHz
    Surface Mount
    1
    -
    TSSOP
    75 mA
    16
    5.1 x 4.5 x 1.05mm
    210MHz
    1.05mm
    5.1mm
    3.63 V
    +85 °C
    2.97 V
    -40 °C
    Texas Instruments
    -
    -
    -
    -
    Through Hole
    1
    -
    PDIP
    -
    16
    19.3 x 6.35 x 4.57mm
    -
    4.57mm
    19.3mm
    6 V
    +125 °C
    2 V
    -55 °C
    Renesas Electronics
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    20Gsps
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    180MHz
    Surface Mount
    8
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    24-QFN
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    24
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    -
    -
    -
    -
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    -
    -
    Texas Instruments
    -
    -
    -
    -
    Surface Mount
    1
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    SOIC
    -
    16
    9.9 x 3.91 x 1.58mm
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    1.58mm
    9.9mm
    6 V
    +125 °C
    2 V
    -55 °C
    Texas Instruments
    -
    -
    -
    -
    Through Hole
    1
    -
    PDIP
    -
    16
    19.3 x 6.35 x 4.57mm
    -
    4.57mm
    19.3mm
    6 V
    +125 °C
    2 V
    -55 °C
    Texas Instruments
    -
    -
    -
    -
    Through Hole
    1
    -
    PDIP
    -
    16
    19.3 x 6.35 x 4.57mm
    -
    4.57mm
    19.3mm
    18 V
    +125 °C
    3 V
    -55 °C
    Renesas Electronics
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    120MHz
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    VFQFPN
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    20
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    4.6 V
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    Abracon
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    460MHz
    Surface Mount
    1
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    TSSOP-16
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    14
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    -
    -
    3.6 V
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    -
    Renesas Electronics
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    -
    25MHz
    Surface Mount
    -
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    TSSOP
    -
    48
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    -
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    -
    4.6 V
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    -
    -
    Renesas Electronics
    -
    -
    -
    -
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    VFQFPN
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    32
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    Renesas Electronics
    Crystal Oscillator
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    100MHz
    Surface Mount
    5
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    TSSOP
    -
    16
    -
    -
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    3.3 V
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    -
    Renesas Electronics
    Crystal Oscillator
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    100MHz
    Surface Mount
    5
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    TSSOP
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    16
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    3.3 V
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    onsemi
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    0.7MHz
    Surface Mount
    -
    0.5MHz
    SOIC
    ±1 μA
    16
    10.45 x 7.6 x 2.4mm
    -
    2.4mm
    10.45mm
    18 V
    +125 °C
    3 V
    -55 °C
    Texas Instruments
    -
    -
    -
    -
    Through Hole
    1
    -
    PDIP
    -
    16
    19.3 x 6.35 x 4.57mm
    -
    4.57mm
    19.3mm
    5.5 V
    +125 °C
    4.5 V
    -55 °C
    onsemi
    -
    -
    -
    210MHz
    Surface Mount
    1
    -
    TSSOP
    75 mA
    16
    5.1 x 4.5 x 1.05mm
    210MHz
    1.05mm
    5.1mm
    3.63 V
    +85 °C
    2.97 V
    -40 °C
    onsemi
    -
    -
    -
    0.7MHz
    Surface Mount
    -
    0.5MHz
    SOIC
    ±1 μA
    16
    10.45 x 7.6 x 2.4mm
    -
    2.4mm
    10.45mm
    18 V
    +125 °C
    3 V
    -55 °C
    Renesas Electronics
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    VFQFPN
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    24
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