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.

    130 Products showing for Clock Synthesizers

    Texas Instruments
    -
    -
    -
    38MHz
    Through Hole
    -
    -
    PDIP
    ±70 mA
    16
    19.69 x 6.6 x 4.57mm
    -
    4.57mm
    19.69mm
    5.5 V
    +125 °C
    3 V
    -40 °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
    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
    -
    -
    -
    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
    -
    -
    -
    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
    18 V
    +125 °C
    5 V
    -55 °C
    Texas Instruments
    -
    -
    -
    -
    Surface Mount
    1
    -
    SOIC
    -
    16
    9.9 x 3.91 x 1.58mm
    -
    1.58mm
    9.9mm
    5.5 V
    +125 °C
    4.5 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
    Analog Devices
    Digital Synthesizer
    180000ksps
    10 bit
    -
    Surface Mount
    -
    -
    SSOP
    -
    28
    10.2 x 5.3 x 1.75mm
    -
    1.75mm
    10.2mm
    -
    +85 °C
    -
    -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
    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
    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
    5.5 V
    +125 °C
    4.5 V
    -55 °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
    Nexperia
    -
    -
    -
    -
    Surface Mount
    1
    -
    SOIC
    50 mA
    16
    10 x 4 x 1.45mm
    -
    1.45mm
    10mm
    6 V
    +125 °C
    2 V
    -40 °C
    Analog Devices
    Digital Synthesizer
    1000000ksps
    14 bit
    -
    Surface Mount
    -
    -
    TQFP
    -
    100
    14 x 14 x 1mm
    -
    1mm
    14mm
    -
    +85 °C
    -
    -40 °C
    Analog Devices
    Digital Synthesizer
    1000000ksps
    14 bit
    -
    Surface Mount
    -
    -
    TQFP
    -
    100
    14 x 14 x 1mm
    -
    1mm
    14mm
    -
    +85 °C
    -
    -40 °C
    Analog Devices
    Digital Synthesizer
    1000000ksps
    14 bit
    -
    Surface Mount
    -
    -
    TQFP
    -
    100
    14 x 14 x 1mm
    -
    1mm
    14mm
    -
    +85 °C
    -
    -40 °C
    Nexperia
    -
    -
    -
    -
    Surface Mount
    1
    -
    SOIC
    50 mA
    16
    10 x 4 x 1.45mm
    -
    1.45mm
    10mm
    5.5 V
    +125 °C
    4.5 V
    -40 °C
    Analog Devices
    Direct Synthesizer
    300Msps
    12 bit
    -
    Surface Mount
    -
    -
    TQFP
    -
    80
    16.2 x 16.2 x 1.2mm
    -
    1.2mm
    16.2mm
    3.465 V
    +85 °C
    3.135 V
    -40 °C
    Analog Devices
    Direct Synthesizer
    300Msps
    12 bit
    -
    Surface Mount
    -
    -
    TQFP
    -
    80
    16.2 x 16.2 x 1.2mm
    -
    1.2mm
    16.2mm
    3.465 V
    +85 °C
    3.135 V
    -40 °C
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