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CDC586PAHR Datenblatt(PDF) 2 Page - Texas Instruments

Teilenummer CDC586PAHR
Bauteilbeschribung  3.3-V PHASE-LOCK-LOOP CLOCK DRIVER
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DETAILED DESCRIPTION OF OUTPUT CONFIGURATIONS
CDC586
SCAS336E – FEBRUARY 1993 – REVISED APRIL 2004
The feedback input (FBIN) is used to synchronize the output clocks in frequency and phase to CLKIN. One of the
twelve output clocks must be fed back to FBIN for the PLL to maintain synchronization between the CLKIN input
and the outputs. The output used as the feedback pin is synchronized to the same frequency as the CLKIN input.
The Y outputs can be configured to switch in phase and at the same frequency as CLKIN. Select inputs (SEL1,
SEL0) configure up to nine Y outputs, in banks of three, to operate at one-half or double the CLKIN frequency,
depending on which pin is fed back to FBIN (see Table 1 and Table 2). All output signal duty cycles are adjusted
to 50%, independent of the duty cycle at CLKIN.
Output-enable (OE) is provided for output control. When OE is high, the outputs are in the high-impedance state.
When OE is low, the outputs are active. TEST is used for factory testing of the device and can be used to bypass
the PLL. TEST should be strapped to GND for normal operation.
Unlike many products containing PLLs, the CDC586 does not require external RC networks. The loop filter for
the PLL is included on chip, minimizing component count, board space, and cost.
Because it is based on PLL circuitry, the CDC586 requires a stabilization time to achieve phase lock of the
feedback signal to the reference signal. This stabilization time is required following power up and application of a
fixed-frequency, fixed-phase signal at CLKIN, as well as following any changes to the PLL reference or feedback
signals. Such changes occur upon change of the select inputs, upon enabling of the PLL via TEST, and upon
enable of all outputs via OE.
The CDC586 is characterized for operation from 0
°C to 70°C.
The voltage-controlled oscillator (VCO) used in the CDC586 PLL has a frequency range of 100 MHz to 200 MHz,
twice the operating frequency range of the CDC586 outputs. The output of the VCO is divided by two and by four
to provide reference frequencies with a 50% duty cycle of one-half and one-fourth the VCO frequency. SEL0 and
SEL1 select which of the two signals are buffered to each bank of device outputs.
One device output must be externally wired to FBIN to complete the PLL. The VCO operates such that the
frequency and phase of this output match that of the CLKIN signal. In the case that a VCO/2 output is wired to
FBIN, the VCO must operate at twice the CLKIN frequency, resulting in device outputs that operate at either the
same or one-half the CLKIN frequency. If a VCO/4 output is wired to FBIN, the device outputs operate at twice or
the same frequency as the CLKIN frequency.
2


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