SY87729L_06 datasheet, PDF - EEWORLD Datasheet

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SY87729L_06: Description3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER; File Size499KB，17 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

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3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER

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SY87729L

3.3V AnyClock

, 10MHz to 365MHz

Fractional N Synthesizer

General Description

The SY87729L is a complete rate independent frequency

synthesizer integrated circuit. From a single reference

source, this device generates a differential PECL

reference frequency for Micrel's SY87721L 10Mbps to

2.7Gbps combined CDR and CMU.

The SY87729L generates an exactly correct reference

frequency for common data transport protocols. This is

especially important in transponder applications, where a

standards compliant protocol data unit must be generated

downstream, even in the absence of any signal from the

associated upstream interface.

In addition, SY87729L will generate exactly correct

reference frequencies for common data transport protocols

augmented by forward error correction codes.

For proprietary applications, the SY87729L generates

reference frequencies guaranteed to enable the SY87721L

CDR to lock to any possible baud rate in its range.

SY87729L accepts configuration via a MicroWire™

interface.

Data sheets and support documentation can be found on

Micrel’s web site at:

www.micrel.com.

AnyClock

Features

•

Fractional synthesizer from 10MHz to 365MHz from a

single 27MHz reference oscillator

•

Generates exactly the correct frequency for common

transport protocols with or without FEC

•

Directly enables SY87721L to lock onto any data rate

within its range

•

Exceeds BellCore and ITU jitter generation

specifications

•

Programmable via MicroWire™ interface

•

Available in 32-Pin EPAD-TQFP package

Applications

•

Metro access system

Transponders

Multiplexers: access, add drop mux

SONET/SDH/ATM-based transmission systems,

modules and test equipment

•

Broadband cross-connects

•

Fiber optic test equipment

•

Protocols supported:

−

OC-1, OC-3, OC-12, OC-48, ATM, Gigabit Ethernet,

Fast Ethernet, Fibre Channel, 2X Fibre Channel,

1394, InfiniBand, Proprietary Optical Transport

AnyClock and AnyRate are registered trademarks of Micrel, Inc.

MicroWire is a trademark of National Semiconductor

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

408

) 944-0800 • fax + 1 (408) 474-1000 •

http://www.micrel.com

July 2011

M9999-072111-G

hbwhelp@micrel.com

or (408) 955-1690

Micrel, Inc.

SY87729L

Pin Configuration

32-Pin ePad TQFP (H32-2)

Pin Description

Pin Number

1, 24

2, 5,11, 12, 13,

15, 16, 19, 20,

23, 28, 29

3, 4

9, 17

21, 22

25, 32

26, 27

Pin Name

VCCA

REFCLK±

PROGCS

PROGDI

PROGSK

VCC

GND

LOCKED

VCCO

CLKOUT±

GNDA

WRVCF±

Pin Function

Analog Supply Voltage.

No Connection. These pins are to be left unconnected.

Differential PECL Input. .

Program Interface Chip Select (TTL Input). This signal forms part of the MicroWire™ interface.

When active high, this signal permits the acquisition of serial data. A falling edge on this input

causes SY87729L to re-acquire lock to a new frequency, based on the program downloaded to it.

Program Interface Data In (TTL Input). One data bit is sampled on each rising edge of PRGSK,

while PROGCS is active high.

Program Interface Serial Clock (TTL Input). One bit of configuration data is read in each clock

cycle

Supply Voltage.

Ground.

Lock Output. This indicates proper operation of all the blocks in the clock synthesis chain. Logic

high indicates that SY87729L is generating the expected frequency at the CLKOUT± output.

Logic low indicates that one or more PLL in the clock synthesis chain has yet to achieve proper

lock.

Output Supply Voltage.

Reference Clock Output. This is the synthesized clock generated from REFCLK±. It can be used

to supply a reference clock to a data recovery device, such as Micrel’s SY87721L.

Analog Ground.

Wrapper Filter (Analog I/O). These pins connect to the output from the wrapper synthesizer

charge pump, as well as the input to the corresponding VCO. A filter network, as described

below, converts the charge pump current to a voltage, and adjusts loop bandwidth

Fractional-N Filter (Analog I/O). These pins connect to the output from the fractional-N

synthesizer charge pump, as well as the input to the corresponding Voltage Controlled Oscillator

(VCO). A filter network, as described below, converts the charge pump current to a voltage, and

adjusts loop bandwidth

30, 31

FNVCF±

July 2011

M9999-072111-G

hbwhelp@micrel.com

or (408) 955-1690

SY87729L_06 Related Products

	SY87729L_06	SY87729LHI	SY87729L	SY87729LHITR	SY87729LHYTR	SY87729LHI-EVAL
Description	3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER	3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER	3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER	3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER	3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER	BOARD EVAL N SY87729 EXPERIMENT

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