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CDCDB2000 Datasheet(Hoja de datos) 26 Page - Texas Instruments

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No. de Pieza. CDCDB2000
Descripción  CDCDB2000 DB2000QL-Compliant 20-Output Clock Buffer for PCIe Gen 1 to Gen 5
Descarga  33 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 26 page
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CDCDB2000
SNAS787 – NOVEMBER 2019
www.ti.com
Product Folder Links: CDCDB2000
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Copyright © 2019, Texas Instruments Incorporated
9 Power Supply Recommendations
High-performance clock buffers are sensitive to noise on the power supply, which can dramatically increase the
additive jitter of the buffer. Thus, it is essential to reduce noise from the system power supply, especially when
the jitter and phase noise is critical to applications.
Filter capacitors are used to eliminate the low-frequency noise from the power supply, where the bypass
capacitors provide the very low impedance path for high-frequency noise and guards the power supply system
against induced fluctuations. These bypass capacitors also provide instantaneous current surges as required by
the device and should have low equivalent series resistance (ESR). To properly use the bypass capacitors, they
must be placed very close to the power-supply terminals and laid out with short loops to minimize inductance. TI
recommends to insert a ferrite bead between the board power supply and the chip power supply that isolates the
high-frequency switching noises generated by the clock buffer. These beads prevent the switching noise from
leaking into the board supply. It is imperative to choose an appropriate ferrite bead with very low DC resistance
to provide adequate isolation between the board supply and the chip supply, as well as to maintain a voltage at
the supply terminals that is greater than the minimum voltage required for proper operation.
shows the recommended power supply filtering and decoupling method.
Figure 11. Power Supply Decoupling




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