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CDCM61004 数据表(PDF) 4 Page - Texas Instruments

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部件名 CDCM61004
功能描述  Four Output, Integrated VCO, Low-Jitter Clock Generator
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

CDCM61004 数据表(HTML) 4 Page - Texas Instruments

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f =
IN
OutputDivider
FeedbackDivider
(
( f
OUT
CDCM61004
SCAS871H – FEBRUARY 2009 – REVISED JANUARY 2016
www.ti.com
5 Description (Continued)
The CDCM61004 is a high-performance, low-phase noise, fully-integrated voltage-controlled oscillator (VCO)
clock synthesizer with four universal output buffers that can be configured to be LVPECL, LVDS, or LVCMOS
compatible. Each universal output can also be converted to two LVCMOS outputs. Additionally, an LVCMOS
bypass output clock is available in an output configuration which can help with crystal loading to achieve an
exact desired input frequency. It has one fully-integrated, low-noise, LC-based VCO that operates in the
1.75 GHz to 2.05 GHz range.
The phase-locked loop (PLL) synchronizes the VCO with respect to the input, which can either be a low-
frequency crystal. The output share an output divider sourced from the VCO core. All device settings are
managed through a control pin structure, which has two pins that control the prescaler and feedback divider,
three pins that control the output divider, two pins that control the output type, and one pin that controls the
output enable. Any time the PLL settings (including the input frequency, prescaler divider, or feedback divider)
are altered, a reset must be issued through the Reset control pin (active low for device reset). The reset initiates
a PLL recalibration process to ensure PLL lock. When the device is in reset, the outputs and dividers are turned
off.
The output frequency (fOUT) is proportional to the frequency of the input clock (fIN). The feedback divider, output
divider, and VCO frequency set fOUT with respect to fIN. For a configuration setting for common wireline and
datacom applications, see Table 3. For other applications, use Equation 1 to calculate the exact crystal oscillator
frequency required for the desired output.
(1)
The output divider can be chosen from 1, 2, 3, 4, 6, or 8 through the use of control pins. Feedback divider and
prescaler divider combinations can be chosen from 25 and 3, 24 and 3, 20 and 4, or 15 and 5, respectively, also
through the use of control pins. CDCM61004 Block Diagram shows a high-level diagram of the CDCM61004.
The device operates in a 3.3-V supply environment and is characterized for operation from –40°C to 85°C.
4
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Copyright © 2009–2016, Texas Instruments Incorporated
Product Folder Links: CDCM61004


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