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LTC6905CS5-80#TR

更新时间： 2024-01-27 17:16:45

品牌	Logo	应用领域
凌特 - Linear		振荡器机械
页数	文件大小	规格书
8页	140K
描述
LTC6905-XXX - Fixed Frequency SOT-23 Oscillator; Package: SOT; Pins: 5; Temperature Range: 0°C to 70°C

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LTC6905CS5-80#TR 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	针数：	5
Reach Compliance Code：	compliant	风险等级：	5.33
Samacsys Confidence：	3	Samacsys Status：	Released
2D Presentation：	https://componentsearchengine.com/2D/0T/1202584.1.1.png	Schematic Symbol：	https://componentsearchengine.com/symbol.php?partID=1202584
PCB Footprint：	https://componentsearchengine.com/footprint.php?partID=1202584	3D View：	https://componentsearchengine.com/viewer/3D.php?partID=1202584
Samacsys PartID：	1202584	Samacsys Image：	https://componentsearchengine.com/Images/9/LTC6905CS5-80#TRPBF.jpg
Samacsys Thumbnail Image：	https://componentsearchengine.com/Thumbnails/1/LTC6905CS5-80#TRPBF.jpg	Samacsys Pin Count：	5
Samacsys Part Category：	Crystal or Oscillator	Samacsys Package Category：	SOT23 (5-Pin)
Samacsys Footprint Name：	5-Lead Plastic TSOT-23	Samacsys Released Date：	2019-09-27 12:49:29
Is Samacsys：	N	其他特性：	TAPE AND REEL
最长下降时间：	0.5 ns	频率调整-机械：	NO
频率稳定性：	20%	JESD-609代码：	e3
安装特点：	SURFACE MOUNT	标称工作频率：	80 MHz
最高工作温度：	85 °C	最低工作温度：	-40 °C
振荡器类型：	CMOS	输出负载：	5 pF
物理尺寸：	2.9mm x 1.75mm x 1.0mm	最长上升时间：	0.5 ns
最大供电电压：	5.5 V	最小供电电压：	2.7 V
表面贴装：	YES	最大对称度：	52.5/47.5 %
端子面层：	Matte Tin (Sn)	Base Number Matches：	1

LTC6905CS5-80#TR 数据手册

LTC6905-XXX Series

W U U

APPLICATIO S I FOR ATIO

then the oscillator frequency may show an additional

error if the switching frequency is 1.4MHz (80MHz/64).

The magnitude of this effect is heavily dependent on

supply bypass and routing.

START-UP TIME

The start-up and settling time to within 1% of the final

frequency is typically 100µs.

MAXIMUM OUTPUT LOAD

JITTER AND POWER SUPPLY NOISE

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

(C_LOAD) of 5pF or more. Performance driving a C_LOAD

greater than 5pF depends on the oscillator’s frequency

(f_OSC) and output resistance (R_OUT). The output rise time

If the LTC6905 is powered by a supply that has frequency

contentequaltotheoutputfrequencythentheoutputjitter

mayincrease. Inaddition, powersupplyrippleinexcessof

20mV at any frequency may increase jitter.

or fall time due to R_OUTand C_LOADis equal to 2.2 • R_OUT

•

Higher divide ratios will result in lower percentage jitter.

For example, jitter percentage of the LTC6905-80 operat-

ing at 20MHz is lower than for the same part operating at

80MHz. Please consult the Jitter vs Frequency graph

showing jitter at various divider ratios.

_LOAD(from10%to90%oftheriseorfalltransition).Ifthe

total output rise time plus fall time is arbitrarily specified

tobeequaltoorlessthan20%oftheoscillator’speriod(1/

f_OSC), then the maximum output C_LOADin picofarads (pF)

should be equal to or less than [45454/(R_OUT• f_OSC)]

(R_OUTin ohms and f_OSCin MHz).

LTC6905 SUGGESTED CRITICAL COMPONENT

LAYOUT

Example: An LTC6905-100 is operating with a 3V power

supply and is set for a f_OSC= 50MHz.

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

In order to provide the specified performance, it is re-

quired that the supply bypass capacitor be placed as close

as possible to the LTC6905. The following additional rules

should be followed for best performance:

the Typical Performance Characteristics).

The maximum output C_LOADshould be equal to or less

than [45454/(27 • 50)] = 33.6pF.

1) The bypass capacitor must be placed as close as

possible to the LTC6905, and no vias should be placed

between the capacitor and the LTC6905. The bypass

capacitor must be on the same side of the circuit board

as the LTC6905.

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

5.2V and the lowest resistive load Pin 5 can drive is 1.30k

(5.2V/4mA). With a V⁺equal to 2.7V and 4mA output

current,theminimumhighleveloutputvoltageis2.4Vand

thelowestresistiveloadPin5candriveis600Ω(2.4V/4mA).

2) Ifagroundplaneisused,theconnectionoftheLTC6905

tothegroundplaneshouldbeascloseaspossibletothe

LTC6905GNDpinandshouldbecomposedofmultiple,

high current capacity vias.

FREQUENCY ACCURACY AND POWER SUPPLY NOISE

The frequency accuracy of the LTC6905 may be affected

when its power supply generates noise with frequency

contents equal to f_MO/64 or its multiples. f_MOis the

highest frequency for an LTC6905-XXX which is with

DIV = V⁺(÷1). This is also the frequency indicated in the

part number (i.e., LTC6905-100, f_MO= 100MHz). f_MO/64

is the master oscillator control loop frequency. For ex-

ample, if the LTC6905-80 with a master oscillator fre-

quency of 80MHz is powered by a switching regulator,

LTC6905

6905x F02

Figure 2. LTC6905 Suggested Critical Component Layout

6905xf

1...3 4 567 8

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