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CDC906 Folha de dados(PDF) 2 Page - Texas Instruments

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Nome de Peças CDC906
Descrição Electrónicos  PROGRAMMABLE 3-PLL CLOCK SYNTHESIZER / MULTIPLIER / DIVIDER
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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CDC906 Folha de dados(HTML) 2 Page - Texas Instruments

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DESCRIPTION
CDC906
SCAS828 – SEPTEMBER 2006
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
The CDC906 is one of the smallest and powerful PLL synthesizer / multiplier / divider available today. Despite its
small physical outlines, the CDC906 is flexible. It has the capability to produce an almost independent output
frequency from a given input frequency.
The input frequency can be derived from a LVCMOS, differential input clock, or a single crystal. The appropriate
input waveform can be selected via the SMBus data interface controller.
To achieve an independent output frequency the reference divider M and the feedback divider N for each PLL
can be set to values from 1 up to 511 for the M-Divider and from 1 up to 4095 for the N-Divider. The PLL-VCO
(voltage controlled oscillator) frequency than is routed to the free programmable output switching matrix to any
of the six outputs. The switching matrix includes an additional 7-bit post-divider (1-to-127) and an inverting logic
for each output.
The deep M/N divider ratio allows the generation of zero ppm clocks from any reference input frequency (e.g., a
27 MHz).
The CDC906 includes three PLLs of those one supports SSC (spread-spectrum clocking). PLL1, PLL2, and
PLL3 are designed for frequencies up to 167 MHz and optimized for zero-ppm applications with wide divider
factors.
PLL2 also supports center-spread and down-spread spectrum clocking (SSC). This is a common technique to
reduce electro-magnetic interference. Also, the slew-rate controllable (SRC) output edges minimize EMI noise.
Based on the PLL frequency and the divider settings, the internal loop filter components is automatically
adjusted to achieve high stability and optimized jitter transfer characteristic of the PLL.
The device provides customized applications. It is preprogrammed with a factory default configuration (see
Figure 13) and can be reprogrammed to a different application configuration via the serial SMBus interface.
Two free programmable inputs, S0 and S1, can be used to control for each application the most demanding
logic control settings (outputs disable to low, outputs 3-state, power down, PLL bypass, etc).
The CDC906 has three power supply pins, VCC, VCCOUT1 and VCCOUT2. VCC is the power supply for the device. It
operates from a single 3.3-V supply voltage. VCCOUT1 and VCCOUT2 are the power supply pins for the outputs.
VCCOUT1 supplies the outputs Y0 and Y1 and VCCOUT2 supplies the outputs Y2, Y3, Y4, and Y5. Both outputs
supplies can be 2.3 V to 3.6 V.
The CDC906 is characterized for operation from 0°C to 70°C.
2
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