Datasheet > 275G-XXLFT

275G-XXLFT

更新时间： 2024-02-25 03:15:43

品牌	Logo	应用领域
艾迪悌 - IDT		时钟光电二极管外围集成电路晶体
页数	文件大小	规格书
10页	220K
描述
Clock Generator, 200MHz, CMOS, PDSO16, 0.173 INCH, ROHS COMPLIANT, TSSOP-16

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275G-XXLFT 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	End Of Life	零件包装代码：	TSSOP
包装说明：	TSSOP,	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.18
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e3
长度：	5 mm	端子数量：	16
最高工作温度：	70 °C	最低工作温度：
最大输出时钟频率：	200 MHz	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
主时钟/晶体标称频率：	27 MHz	认证状态：	Not Qualified
座面最大高度：	1.2 mm	最大供电电压：	3.465 V
最小供电电压：	3.135 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	MATTE TIN
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	4.4 mm	uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, OTHER
Base Number Matches：	1

275G-XXLFT 数据手册

ICS275

TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER

EPROM VCXO AND SYNTHESIZER

The external crystal must be connected as close to the chip

as possible and should be on the same side of the PCB as

the ICS275. There should be no via’s between the crystal

pins and the X1 and X2 device pins. There should be no

signal traces underneath or close to the crystal. See

application note MAN05.

External Components

The ICS275 requires a minimum number of external

components for proper operation.

Series Termination Resistor

Crystal Tuning Load Capacitors

Ω

The crystal traces should include pads for small fixed

capacitors, one between X1 and ground, and another

between X2 and ground. Stuffing of these capacitors on the

PCB is optional. The need for these capacitors is

determined at system prototype evaluation, and is

influenced by the particular crystal used (manufacture and

frequency) and by PCB layout. The typical required

capacitor value is 1 to 4 pF.

Ω

Decoupling Capacitors

To determine the need for and value of the crystal

adjustment capacitors, you will need a PC board of your final

layout, a frequency counter capable of about 1 ppm

resolution and accuracy, two power supplies, and some

samples of the crystals which you plan to use in production,

along with measured initial accuracy for each crystal at the

specified crystal load capacitance, CL.

Decoupling capacitors of 0.01µF must be connected

between each VDD and the PCB ground plane. For optimum

device performance, the decoupling capacitor should be

mounted on the component side of the PCB. Aboid the use

of vias on the decoupling circuit.

Quartz Crystal

The ICS275 VCXO function consists of the external crystal

and the integrated VCXO oscillator circuit. To assure the

best system performance (frequency pull range) and

reliability, a crystal device with the recommended

parameters (shown below) must be used, and the layout

guidelines discussed in the following section shown must be

followed.

To determine the value of the crystal capacitors:

1. Connect VDD of the ICS275 to 3.3 V. Connect pin 1 of the

ICS275 to the second power supply. Adjust the voltage on

pin 1 to 0V. Measure and record the frequency of the CLK

output.

2. Adjust the voltage on pin 1 to 3.3 V. Measure and record

the frequency of the same output.

The frequency of oscillation of a quartz crystal is determined

by its “cut” and by the load capacitors connected to it. The

ICS275 incorporates on-chip variable load capacitors that

“pull” (change) the frequency of the crystal. The crystal

specified for use with the ICS275 is designed to have zero

frequency error when the total of on-chip + stray

capacitance is 14 pF.

To calculate the centering error:

Recommended Crystal Parameters:

(f_3.0V–f_target)+(f_0V–f_target

)

Error = 10⁶x

–error_xtal

Initial Accuracy at 25°C

Temperature Stability

Aging

Load Capacitance

Shunt Capacitance, C0

C0/C1 Ratio

20 ppm

30 ppm

20 ppm

14 pf

7 pF Max

250 Max

35Ω Max

----------------------------------------------------------------------

f_target

Where:

= nominal crystal frequency

Equivalent Series Resistance

target

IDT™ / ICS™ TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER 3

ICS275

REV D 102808

1 234 5 6 7...10

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