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CDCM6208V1FRGZR Datasheet(PDF) 21 Page - Texas Instruments

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Part No. CDCM6208V1FRGZR
Description  2:8 Clock Generator, Jitter Cleaner with Fractional Dividers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

CDCM6208V1FRGZR Datasheet(HTML) 21 Page - Texas Instruments

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(spur/20)
-12
p-p
CLK
2 x 10
Deterministic Jitter (ps
) =
x 10
x f
p
CDCM6208V1F
www.ti.com
SCAS943 – MAY 2015
8.24.1 Fractional Output Divider Jitter Performance
The fractional output divider jitter performance is a function of the fraction output divider input frequency as well
as actual fractional divide setting itself. To minimize the fractional output jitter, it is recommended to use the least
number of fractional bits and the highest input frequency possible into the divider. As observable in Figure 4, the
largest jitter contribution occurs when only one fractional divider bit is selected, and especially when the bits in
the middle range of the fractional divider are selected. Tested using a LeCroy 40 Gbps RealTime scope over a
time window of 200 ms. The RJ impact on TJ is estimated for a BERT 10
(–12) – 1. This measurement result is
overly pessimistic, as it does not bandwidth limit the high-frequencies. In a real system, the SERDES TX will BW
limit the jitter through its PLL roll-off above the TX PLL bandwidth of typically bit rate divided by 10.
8.24.2 Power Supply Ripple Rejection (PSRR) versus Ripple Frequency
See Figure 8 for reference.
Many system designs become increasingly more sensitive to power supply noise rejection. In order to simplify
design and cost, the CDCM6208V1F has built in internal voltage regulation, improving the power supply noise
rejection over designs with no regulators. As a result, the following output rejection is achieved:
The DJ due to PSRR can be estimated using Equation 1:
(1)
Example: Therefore, if 100 mV noise with a frequency of 10 kHz were observed at the output supply, the
according output jitter for a 122.88 MHz output signal with LVDS signaling could be estimated with DJ = 0.7ps.
Copyright © 2015, Texas Instruments Incorporated
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