Datasheet > 信号电路 > 锁相环或频率合成电路> LTC6905HS5#PBF

LTC6905HS5#PBF

更新时间： 2024-02-05 20:08:41

品牌	Logo	应用领域
凌特 - Linear		振荡器
页数	文件大小	规格书
8页	120K
描述
LTC6905 - 17MHz to 170MHz Resistor Set SOT-23 Oscillator; Package: SOT; Pins: 5; Temperature Range: -40°C to 125°C

阅读下载

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

LTC6905HS5#PBF 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
零件包装代码：	SOT	包装说明：	VSSOP, TSOP5/6,.11,37
针数：	5	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.4	模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER
JESD-30 代码：	R-PDSO-G5	JESD-609代码：	e3
长度：	2.9 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	5
最高工作温度：	125 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	VSSOP
封装等效代码：	TSOP5/6,.11,37	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	3/5 V	认证状态：	Not Qualified
座面最大高度：	1 mm	子类别：	Other Analog ICs
最大供电电流 (Isup)：	20 mA	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	2.7 V	标称供电电压 (Vsup)：	3 V
表面贴装：	YES	技术：	CMOS
温度等级：	AUTOMOTIVE	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	0.95 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	1.625 mm	Base Number Matches：	1

LTC6905HS5#PBF 数据手册

LTC6905

W U U

APPLICATIO S I FOR ATIO

SELECTING THE DIVIDER SETTING AND RESISTOR

Example:AnLTC6905isoperatingwitha3Vpowersupply

and is set for a f_OSC= 50MHz.

R_OUTwith V⁺= 3V is 27Ω (using the R_OUTvs V⁺graph in

the Typical Performance Characteristics).

The LTC6905’s master oscillator has a frequency range

spanning 68.9MHz to 170MHz. A programmable divider

extendsthefrequencyrangefrom17.225MHzto170MHz.

Table 1 describes the recommended frequencies for each

divider setting. Note that the ranges overlap; at some

frequencies there are two divider/resistor combinations

that result in the same frequency. Choosing a higher

divider setting will result in less jitter at the expense of

slightly higher supply current.

The maximum output C_LOADshould be equal to or less

than [45454/(27 • 50)] = 33.6pF.

The lowest resistive load Pin 5 can drive can be calculated

using the minimum high level output voltage in the Elec-

trical Characteristics. With a V⁺equal to 5.5V and 4mA

output current, the minimum high level output voltage is

5V and the lowest resistive load Pin 5 can drive is 1.25k

(5V/4mA). With a V⁺equal to 2.7V and 4mA output

current,theminimumhighleveloutputvoltageis1.9Vand

thelowestresistiveloadPin5candriveis475Ω(1.9V/4mA).

Table 1. Frequency Range vs Divider Setting

DIVIDER SETTING

FREQUENCY RANGE

68.9MHz to 170MHz

34.45MHz to 85MHz

17.225MHz to 43MHz

÷1

÷2

÷4

⇒

DIV (Pin 4) = V

DIV (Pin 4) = Floating

DIV (Pin 4) = GND

After choosing the proper divider setting, determine the

correct frequency-setting resistor. Because of the linear

correspondence between oscillation period and resis-

tance,asimpleequationrelatesresistancewithfrequency.

FREQUENCY ACCURACY AND POWER SUPPLY NOISE

The frequency accuracy of the LTC6905 may be affected

when its power supply generates noise with frequency

contentsequaltof_MO/64oritsmultiples(f_MOistheinternal

LTC6905 master oscillator frequency before the divider

and f_MO/64 is the master oscillator control loop fre-

quency). If for example, the master oscillator frequency is

set equal to 80MHz and the LTC6905 is powered by a

switching regulator, then the oscillator frequency may

show an additional error if the switching frequency is

1.4MHz (80MHz/64).

⎧

10k ⎛ 168.5MHz ⎞

⎪

R_SET

•

, N = 2

⎨

⎟

⎜

⎝ f_OSC– 1.5MHz⎠

(R_SETMIN= 10k, R_SETMAX= 25k)

Any resistor, R_SET, tolerance adds to the inaccuracy of the

⎪4

⎩

oscillator, f_OSC

START-UP TIME

JITTER AND POWER SUPPLY NOISE

Thestart-uptimeandsettlingtimetowithin1%ofthefinal

frequency is typically 100µs.

If the LTC6905 is powered by a supply that has frequency

contentsequaltotheoutputfrequencythentheoscillators

jitter may increase. In addition, power supply ripple in

excess of 20mV at any frequency may increase jitter.

MAXIMUM OUTPUT LOAD

The LTC6905 output (Pin 5) can drive a capacitive load

(C_LOAD) of 5pF or more. Driving a C_LOADgreater than 5pF

depends on the oscillator’s frequency (f_OSC) and output

resistance (R_OUT). The output rise time or fall time due to

R_OUTand C_LOADis equal to 2.2 • R_OUT• C_LOAD(from 10%

to 90% of the rise or fall transition). If the total output rise

time plus fall time is arbitrarily specified to be equal to or

less than 20% of the oscillator’s period (1/f_OSC), then the

maximumoutputC_LOADinpicofarads(pF)shouldbeequal

to or less than [45454/(R_OUT• f_OSC)] (R_OUTin ohms and

f_OSCin MHz).

JITTER AND DIVIDE RATIO

At a given output frequency, a higher master oscillator

frequency and a higher divide ratio will result in lower jitter

and higher power supply dissipation. Indeterminate jitter

percentage will decrease by a factor of slightly less than

the square root of the divider ratio, while determinate jitter

will not be similarly attenuated. Please consult the speci-

ficationtablesandJittervsFrequencygraphshowingjitter

at various divider ratios.

6905fa

1...3 4 567 8

下载PDF

与LTC6905HS5#PBF相关器件

型号	品牌	描述	获取价格	数据表
LTC6905HS5#TRMPBF	Linear	LTC6905 - 17MHz to 170MHz Resistor Set SOT-23 Oscillator; Package: SOT; Pins: 5; Temperatu	获取价格
LTC6905HS5#TRPBF	Linear	LTC6905 - 17MHz to 170MHz Resistor Set SOT-23 Oscillator; Package: SOT; Pins: 5; Temperatu	获取价格
LTC6905HS5-100	Linear	Fixed Frequency SOT-23 Oscillator	获取价格
LTC6905HS5-100#PBF	ADI	LTC6905-XXX - Fixed Frequency SOT-23 Oscillator; Package: SOT; Pins: 5; Temperature Range:	获取价格
LTC6905HS5-100#TRM	ADI	CMOS Output Clock Oscillator, 100MHz Nom	获取价格
LTC6905HS5-100#TRMPBF	ADI	Fixed Frequency SOT-23 Oscillator	获取价格

与LTC6905HS5#PBF相关文章

STM32H743技术深度剖析与应用案例探索
2024-05-30

15
LM321中文资料解析：引脚功能介绍、技术特点、技术特性分析
2024-05-30

15
74HC14芯片资料介绍：性能特性分析、引脚介绍
2024-05-30

13
LM1875芯片手册：功放参数分析、引脚说明、电路设计要点
2024-05-30

10

产品中心

服务支持

精选活动

关于我们

帮助中心

LTC6905HS5#PBF

LTC6905HS5#PBF 技术参数

LTC6905HS5#PBF 数据手册

与LTC6905HS5#PBF相关器件

与LTC6905HS5#PBF相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LTC6905HS5#PBF

LTC6905HS5#PBF 技术参数

LTC6905HS5#PBF 数据手册

与LTC6905HS5#PBF相关器件

与LTC6905HS5#PBF相关文章

您还可以找

您在本页遇到什么问题？