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 Products showing for Clock Synthesizers

    Renesas Electronics
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    VFQFPN
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    32
    -
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    -
    -
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    -
    -
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    Renesas Electronics
    -
    -
    -
    25MHz
    Surface Mount
    -
    -
    TSSOP
    -
    28
    -
    -
    -
    -
    4.6 V
    -
    -
    -
    Renesas Electronics
    -
    -
    -
    -
    -
    -
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    TSSOP
    109 mA
    28
    -
    400MHz
    -
    -
    -
    -
    -
    -
    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
    -
    -
    -
    200MHz
    -
    -
    -
    VFQFPN
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    24
    -
    -
    -
    -
    3.465 V
    -
    -
    -
    Renesas Electronics
    Digital Synthesizer
    -
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    200MHz
    Surface Mount
    -
    -
    TSSOP
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    20
    -
    -
    -
    -
    3.465 V
    -
    -
    -
    Texas Instruments
    -
    -
    -
    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
    3.6 V
    +85 °C
    3 V
    -40 °C
    Renesas Electronics
    -
    -
    -
    -
    -
    -
    -
    TSSOP
    109 mA
    28
    -
    400MHz
    -
    -
    -
    -
    -
    -
    onsemi
    -
    -
    -
    800MHz
    Surface Mount
    1
    400MHz
    QFN
    85 mA
    32
    5 x 5 x 0.95mm
    20MHz
    0.95mm
    5mm
    5.25 V
    +85 °C
    3.135 V
    -40 °C
    Renesas Electronics
    Crystal Oscillator
    -
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    100MHz
    Surface Mount
    5
    -
    TSSOP
    -
    16
    -
    -
    -
    -
    3.3 V
    -
    -
    -
    Renesas Electronics
    -
    -
    -
    125MHz
    Surface Mount
    -
    -
    TSSOP
    -
    48
    -
    -
    -
    -
    4.6 V
    -
    -
    -
    Renesas Electronics
    -
    -
    -
    -
    -
    -
    -
    VFQFPN
    -
    24
    -
    -
    -
    -
    -
    -
    -
    -
    Renesas Electronics
    -
    20Gsps
    -
    180MHz
    Surface Mount
    8
    -
    24-QFN
    -
    24
    -
    -
    -
    -
    -
    -
    -
    -
    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
    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
    Texas Instruments
    -
    -
    -
    -
    Surface Mount
    1
    -
    SOIC
    -
    16
    9.9 x 3.91 x 1.58mm
    -
    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
    18 V
    +125 °C
    3 V
    -55 °C
    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
    Renesas Electronics
    -
    -
    -
    125MHz
    Surface Mount
    -
    -
    TSSOP
    -
    48
    -
    -
    -
    -
    4.6 V
    -
    -
    -
    onsemi
    -
    -
    -
    200MHz
    Surface Mount
    2
    25MHz
    TSSOP
    100 mA
    16
    5.1 x 4.5 x 1.05mm
    25MHz
    1.05mm
    5.1mm
    3.465 V
    +85 °C
    3.135 V
    -40 °C
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