CDCE925集成電路（IC）的時(shí)鐘發(fā)生器PLL頻率合成器規(guī)格書(shū)PDF中文資料

CDCE925屬于集成電路（IC）的時(shí)鐘發(fā)生器PLL頻率合成器。由德州儀器制造生產(chǎn)的CDCE925時(shí)鐘發(fā)生器，PLL，頻率合成器時(shí)鐘發(fā)生器、PLL 和頻率合成器集成電路 (IC) 可為邏輯器件提供參考信號(hào)的穩(wěn)定定時(shí)脈沖，這些器件包括計(jì)算機(jī)、微控制器、數(shù)據(jù)通信系統(tǒng)和圖形/視頻發(fā)生器。這些集成電路可能包括緩沖器、驅(qū)動(dòng)器、分頻器、倍頻器、多路復(fù)用器、合成器、扇出分配器和預(yù)分頻器。

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

? Low-Noise PLL Core

– PLL Loop Filter Components Integrated

– Low Period Jitter (Typical 60 ps)

? Separate Output Supply Pins

– CDCE925: 3.3 V and 2.5 V

– CDCEL925: 1.8 V

? Flexible Clock Driver

– Three User-Definable Control Inputs

[S0/S1/S2], for Example, SSC Selection,

Frequency Switching, Output Enable, or Power

Down

– Generates Highly Accurate Clocks for Video,

Audio, USB, IEEE1394, RFID, Bluetooth?,

WLAN, Ethernet?, and GPS

– Generates Common Clock Frequencies Used

With TI-DaVinci?, OMAP?, DSPs

– Programmable SSC Modulation

– Enables 0-PPM Clock Generation

? 1.8-V Device Power Supply

? Wide Temperature Range: –40°C to 85°C

? Packaged in TSSOP

? Development and Programming Kit for Easy PLL

Design and Programming (TI Pro-Clock?)

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.