CD-700-LAC-GEB-77.760 datasheet, PDF

Datasheet> All Categories > CD-700-LAC-GEB-77.760

Preview

CD-700-LAC-GEB-77.760: DescriptionComplete VCXO Based Phase Lock Loop; File Size122KB，14 Pages; ManufacturerVectron International, Inc.; Websitehttp://www.vectron.com/

Download Datasheet View All

CD-700-LAC-GEB-77.760 Overview

Complete VCXO Based Phase Lock Loop

Preview

Download Datasheet

View All

CD-700

Complete VCXO Based Phase Lock Loop

Features

•

5 x 7.5 x 2 mm, smallest VCXO PLL available

•

Output Frequencies to 77.76 MHz

•

5.0 or 3.3 Vdc operation

•

Tri-State Output

•

Holdover on Loss of Signal Alarm

•

VCXO with CMOS outputs

•

0/70 or –40/85

°C

temperature range

•

Hermetically sealed ceramic SMD package

•

Product is compliant to RoHS directive

Applications

•

Frequency Translation

•

Clock Smoothing, Clock Switching

PHO OPN

(3)

(2)

OPOUT

(1)

(16)

LOSIN

(4)

•

NRZ Clock recovery

•

DSLAM, ADM, ATM, Aggregation, Optical

Switching/Routing, Base Station

DATAIN

(5)

CLKIN

(6)

VCXO

Phase

Detector

and LOS

OP-Amp

Optional

Divider

OUT1

(13)

•

Synchronous Ethernet

•

Low jitter PLL’s

OUT2

(11)

Description

The VI CD-700 is a user-configurable crystal

based PLL integrated circuit. It includes a digital

phase detector, op-amp, VCXO and additional

integrated functions for use in digital

synchronization applications. Loop filter software

is available as well SPICE models for circuit

simulation.

Tel: 1-88-VECTRON-1

•

Web:

www.vectron.com

Rev : 06Apr08

RCLK RDATA

(9)

(10)

OPP

(15)

GND

(7)

VDD

(14)

HIZ

(12)

Figure 1. CD-700 Block Diagram

Vectron International, 267 Lowell Rd, Hudson NH 03051-4916

Page 1 of 14

CD-700, VCXO Based PLL

CD-700 Theory of Operation

Phase Detector

The phase detector has two buffered inputs (DATAIN and CLKIN) which are designed to switch at

1.4 volts. DATAIN is designed to accept an NRZ data stream but may also be used for clock signals

which have a 50% duty cycle. CLKIN is connected to OUT1 or OUT2, or a divided version of one of these

outputs. CLKIN and DATAIN and are protected by ESD diodes and should not exceed the power supply

voltage or ground by more than a few hundred millivolts.

The phase detector is basically a latched flip flop/exclusive-or gate/differential amplifier filter design to

produce a DC signal proportional to the phase between the CLKIN and DATAIN signals (see Figure 4 for

a block diagram and Figure 5 for an open loop transfer curve). This will simplify the PLL design as the

designer does not have to filter narrow pulse signals to a DC level. Under locked conditions the rising

edge of CLKIN will be centered in the middle of the DATAIN signal (see Figure 6).

The phase detector gain is 0.53V/rad x data density for 5volt operation and 0.35V/rad x data density for

3.3 volt operation. Data density is equal to 1.0 for clock signals and is system dependent on coding and

design for NRZ signals, but 0.25 could be used as a starting point for data density.

The phase detector output is a DC signal for DATAIN frequencies greater than 1 MHz but produces

significant ripple when inputs are less than 200 kHz. Additional filtering is required for lower input

frequencies applications such as 8kHz (see Figures 8 and 9 as examples).

Under closed loop conditions the active filter has a blocking capacitor which provides a very high DC

gain, so under normal locked conditions and input frequencies >1 MHz, PHO will be about V

/2 and will

not vary significantly with changes in input frequency (within lock range). The control voltage (pin 16) will

vary according to the input frequency offset, but PHO will remain relatively constant.

Data In

(pin 5)

Clock In

(pin 6)

30 kΩ

20 kΩ

PHO

(pin 3)

Gain = V

/ 2π

Gain = 2 / 3

Figure 4. Simplified Phase Detector Block Diagram

Vectron International, 267 Lowell Rd, Hudson NH 03051-4916

Page 4 of 14

Tel: 1-88-VECTRON-1

•

Web:

www.vectron.com

Rev : 06Apr08

Recommended Resources

Low voltage detector circuit diagram

A circuit that uses thyristors to control forward and reverse rotation of DC motors

High input impedance window comparator

Simple face hair circuit with 90" conductor

Micropower voltage detection integrated chip MAX834/835 with latch output

Simple single button switch circuit (error corrected)

【Teaching Embedded Linux from Scratch】Episode 18: Lesson 18: How to make your own application start automatically at boot 1. First copy our own application to the development board, for example: /led_test 2. According to the startup script /etc/init....; babyking Embedded System

Has anyone developed network card drivers under ICH8/ICH9?: I can't find the document Intel ICH8/ICH9 (MAC) GbE LAN Controller and 82566/82562V (PHY) Software Developer's Manual. I can't find it on Intel's official website. Does anyone have one? Can you share ...; polestar707 Embedded System

Control WIFI under WINCE: Hi All, I have a project that I want to use a program under WINCE to control the start/stop of WIFI, automatically select AP, and set the WEB/WAP key without user intervention. How can I do this? Can ...; xfzj1314 Embedded System

12864 Study Notes_4---A few additional explanations: I found that the previous articles did not introduce the graphic display RAM (GDRAM) in great detail, so I will introduce it in detail below: Graphics display RAM (GDRAM) provides 64*256 bits of GDRAM...; qinkaiabc Microcontroller MCU

I need to make a small driver under Windows to send the obtained data to the network through the network card.: I have never done driver development before, and I have no idea what to do now. I want to ask about the general idea of this program and what materials I should read? Also, do I need to configure the ...; zbashore Embedded System

F28335 Memory Map: As shown in the figure, it is the memory map of f28335. 10 on-chip SRAMs (M1, M0, L0~L7), and the external memory space is expanded from the XINTF external interface. The on-chip storage block address...; fish001 DSP and ARM Processors

Shortcut: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ

Popular Components