Datasheet > ACS8510REV2.1

ACS8510REV2.1

更新时间： 2024-02-23 00:01:56

品牌	Logo	应用领域
商升特 - SEMTECH		/
页数	文件大小	规格书
76页	789K
描述
Synchronous Equipment Timing Source for SONET or SDH Network Elements

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ACS8510REV2.1 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.77	电信集成电路类型：	ATM/SONET/SDH SUPPORT CIRCUIT
Base Number Matches：	1

ACS8510REV2.1 数据手册

ACS8510 Rev2.1 SETS

FINAL

ADVANCED COMMUNICATIONS

Crystal Frequency Calibration

reference input and generate the T_OUT0clock,

the 8 kHz Frame Synchronization clock and the

2 kHz Multi-Frame Synchronization clock with

the same phase. The ACS8510 includes a

microprocessor port, providing access to the

configuration and status registers for device

setup and monitoring.

The absolute crystal frequency accuracy is less

important than the stability since any frequency

offset can be compensated by adjustment of

calibration and compensation of any crystal

frequency variation away from its nominal value.

+/- 50 ppm adjustment would be sufficient to

cope with most crystals, in fact the range is an

order of magnitude larger due to the use of

two 8 bit register locations. The setting of the

conf_nominal_frequency register allows for this

adjustment. An increase in the register value

increases the output frequencies by 0.02 ppm

for each LSB step. The default value (in decimal)

is 39321. The minimum being 0 and the

maximum 65535, gives a -700 ppm to

+500 ppm adjustment range of the output

frequencies.

Local Oscillator Clock

The Master system clock on the ACS8510

should be provided by an external clock oscillator

of frequency 12.80 MHz. The clock specification

is important for meeting the ITU/ETSI and

Telcordia performance requirements for

Holdover mode. ITU and ETSI specifications

permit a combined drift characteristic, at

constant temperature, of all non-temperature-

related parameters, of up to 10 ppb per day.

The same specifications allow a drift of 1 ppm

over a temperature range of 0 to +70 °C.

Telcordia specifications are somewhat tighter,

requiring a non-temperature-related drift of less

than 40 ppb per day and a drift of 280 ppb

over the temperature range 0 to +50 °C.

For example, if the crystal was oscillating at

12.8 MHz + 5 ppm, then the calibration value

in the register to give a -5 ppm adjustment in

output frequencies to compensate for the

crystal inaccuracy, would be :

ITU and ETSI Specification

39321 - (5 / 0.02) = 39071 (decimal)

Tolerance:

Drift*:

+/- 4.6 ppm over 20 year life time.

+/- 0.05 ppm/15 seconds @ constant temp.

+/- 0.01 ppm/day @ constant temp.

+/- 1 ppm over temp. range 0 to +70 °C

Input Interfaces

The ACS8510 supports up to fourteen input

reference clock sources from input types T_IN1,

T_IN2and T_IN3using TTL, CMOS, PECL, LVDS and

AMI buffer I/O technologies. These interface

technologies support +3.3 V and +5 V

operation.

*Frequency drift over supply range of +2.7V to +3.3V.

Telcordia GR-1244 CORE Specification

Tolerance:

Drift*:

+/- 4.6 ppm over 20 year life time.

+/- 0.05 ppm/15 seconds @ constant temp.

+/- 0.04 ppm/day @ constant temp.

Over-Voltage Protection

The ACS8510 may require Over-Voltage

Protection on input reference clock ports

according to ITU Recommendation K.41.

Semtech protection devices are recommended

for this purpose (see separate Semtech data

book).

+/- 0.28 ppm over temp. range 0 to +50 °C

*Frequency drift over supply range of +2.7V to +3.3V.

Please contact Semtech for information on

crystal oscillator suppliers.

Revision 2.00/September 2003 Semtech Corp.

www.semtech.com

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与ACS8510REV2.1相关器件

型号	品牌	获取价格	描述	数据表
ACS8510REV2.1SETS	ETC	获取价格	Synchronous Equipment Timing Source for SONET or SDH Network Elements
ACS8510REV2.1T	SEMTECH	获取价格	Support Circuit,
ACS8510T	SEMTECH	获取价格	暂无描述
ACS8512	SEMTECH	获取价格	ATM/SONET/SDH IC, PQFP64
ACS8514	SEMTECH	获取价格	Synchronous Equipment Timing Source Partner IC for 2nd T4 DPLL, Accurate Monitoring & Inpu
ACS8514T	SEMTECH	获取价格	Synchronous Equipment Timing Source Partner IC for 2nd T4 DPLL, Accurate Monitoring & Inpu
ACS8515	SEMTECH	获取价格	Line Card Protection Switch for SONET or SDH Network Elements
ACS8515LC	SEMTECH	获取价格	Line Card Protection Switch for SONET or SDH Network Elements
ACS8515P	SEMTECH	获取价格	Line Card Protection Switch for SONET or SDH Network Elements
ACS8515REV2.1	SEMTECH	获取价格	Line Card Protection Switch for SONET or SDH Network Elements

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