CDCEL925PWR Texas Instruments 时钟合成器/抖动清除器 Programmable 3-PLL VCXO Clock Synth

1 Features

1• Member of Programmable Clock Generator

Family

– CDCEx913: 1-PLL, 3 Outputs

– CDCEx925: 2-PLL, 5 Outputs

– CDCEx925: 3-PLL, 7 Outputs

– CDCEx949: 4-PLL, 9 Outputs

• In-System Programmability and EEPROM

– Serial Programmable Volatile Register

– Nonvolatile EEPROM to Store Customer

Settings

• Flexible Input Clocking Concept

– External Crystal: 8 MHz to 32 MHz

– On-Chip VCXO: Pull Range ±150 ppm

– Single-Ended LVCMOS Up to 160 MHz

• Free Selectable Output Frequency Up to

230 MHz

2 Applications

D-TVs, STBs, IP-STBs, DVD Players, DVD

Recorders, and Printers

3 Description

The CDCE925 and CDCEL925 are modular PLLbased

low-cost, high-performance, programmable

clock synthesizers, multipliers, and dividers. They

generate up to five output clocks from a single input

frequency. Each output can be programmed insystem

for any clock frequency up to 230 MHz, using

up to two independent configurable PLLs.

The CDCEx925 has a separate output supply pin,

VDDOUT, which is 1.8 V for CDCEL925 and 2.5 V to

3.3 V for CDCE925.

The input accepts an external crystal or LVCMOS

clock signal. In case of a crystal input, an on-chip

load capacitor is adequate for most applications. The

value of the load capacitor is programmable from 0 to

20 pF. Additionally, an on-chip VCXO is selectable

which allows synchronization of the output frequency

to an external control signal, that is, PWM signal.