Datasheet > ACS4060

ACS4060

更新时间： 2024-09-23 14:40:47

品牌	Logo	应用领域
商升特 - SEMTECH		电信电信集成电路
页数	文件大小	规格书
1页	16K
描述
Telecom Circuit, 1-Func, PQFP100, TQFP-100

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ACS4060 技术参数

生命周期：	Obsolete	零件包装代码：	QFP
包装说明：	LFQFP,	针数：	100
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.84	Is Samacsys：	N
JESD-30 代码：	S-PQFP-G100	长度：	14 mm
功能数量：	1	端子数量：	100
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	LFQFP
封装形状：	SQUARE	封装形式：	FLATPACK, LOW PROFILE, FINE PITCH
认证状态：	Not Qualified	座面最大高度：	1.6 mm
标称供电电压：	5 V	表面贴装：	YES
电信集成电路类型：	TELECOM CIRCUIT	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	0.5 mm
端子位置：	QUAD	宽度：	14 mm
Base Number Matches：	1

ACS4060 数据手册

Advanced COMMUNICATIONS Products

EFFICIENT FIBER SOLUTIONS

Application Note AN-ACS-2

SEMTECH

Rev 1.1 April 9, 1999

Crystals and Padding Capacitors

for ACS4050, ACS4060

Crystal Selection

The following specifications need to be used for crystals suitable for ACS4050 and ACS4060:

Frequency

Calibration tolerance

Temperature tolerance

Load capacitance

Other specifications such as package should be considered by the user in the context of the specific application.

Frequency

The data sheets for ACS4050 and ACS4060 give full information of crystal frequencies required. Most E1

applications use 32.768MHz and most T1 applications use 30.880MHz. It is important that this is the fundamental

frequency of the crystal.

Calibration Tolerance

This is the allowed error of the crystal from the specified frequency at a fixed temperature, usually 25°C. For this

application the tolerance should not exceed ±25 ppm.

Temperature Tolerance

This is the allowed change in frequency of the crystal over the temperature range of the crystal. For this application

the tolerance should not exceed ±25 ppm. Acapella/Semtech usually specifies crystals for the temperature range -40°C to

+85°C, although other ranges are available.

Note, the combined calibration and temperature tolerances give an allowed variation of ±50 ppm from the specified

frequency, over the complete temperature range.

Load Capacitance

For the ACS4050 and ACS4060, the crystal requires a load capacitance. Typically crystals have standard loads of

15pF, 20pF and 30pF.

Any of these values can be used, or any intermediate value, but Acapella/Semtech recommends that values close to

30pF, or greater, are not used – as this could result in overloading the internal oscillator of the IC.

Padding Capacitor Selection

As can be seen in the data sheets for the ACS4050 and ACS4060, the crystal is connected to the IC along with two

padding capacitors. These capacitors are connected one from each side of the crystal to ground. The capacitors should be

equal value, and the total capacitance on each side of the crystal should be twice the crystal load capacitance.

When determining the padding capacitor value, allowance must be made for internal IC capacitance, and any stray

capacitance from leads and track on the PCB.

The following values are given as a guide. The user should determine whether these values are correct in the specific

application.

Crystal load capacitance

Capacitor values

Expected change from

required frequency

-20ppm

15pF

20pF

30pF

22pF

27pF

47pF

+20ppm

+15ppm

In very rough figures, an increase of 1pF in the capacitor values gives a decrease of 10ppm in the frequency –

however, only use this as a guide.

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