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LTC6908-2_15 PDF预览

LTC6908-2_15

更新时间： 2024-11-11 01:18:47
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 253K
描述
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation

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中文翻译

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LTC6908-2_15 数据手册

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LTC6908-1/LTC6908-2  
Resistor Set SOT-23  
Oscillator with Spread  
Spectrum Modulation  
U
DESCRIPTIO  
FEATURES  
The LTC®6908 is an easy-to-use precision oscillator that  
provides 2-outputs, shifted by either 180° or 90°. The  
oscillator frequency is programmed by a single external  
■
LTC6908-1: Complementary Outputs (0°/180°)  
■
LTC6908-2: Quadrature Outputs (0°/90°)  
■
50kHz to 10MHz Frequency Range  
■
One External Resistor Sets the Frequency  
resistor(R )andspreadspectrumfrequencymodulation  
SET  
■
Optional Spread Spectrum Frequency Modulation  
(SSFM) can be activated for improved electromagnetic  
for Improved EMC Performance  
10ꢀ Frequency Spreading  
compatibility (EMC) performance.  
■
The LTC6908 operates with a single 2.7V to 5.5V supply  
and provides rail-to-rail, 50% duty cycle square wave  
outputs. A single resistor from 10k to 2M is used to select  
anoscillatorfrequencyfrom50kHzto10MHz(5Vsupply).  
The oscillator can be easily programmed using the simple  
formula outlined below:  
+
■
400µA Supply Current Typical (V = 5V, 50kHz)  
+
■
Frequency Error ≤1.5% Max (T = 25°C, V = 3V)  
A
■
■
■
■
■
40ppm/°C Temperature Stability  
Fast Start-Up Time: 260µs Typical (1MHz)  
Outputs Muted Until Stable  
Operates from a Single 2.7V to 5.5V Supply  
Available in Low Profile (1mm) ThinSOT and DFN  
(2mm × 3mm) Packages  
f
=10MHz • 10k/R  
SET  
OUT  
The LTC6908’s SSFM capability modulates the output  
frequency by a pseudorandom noise (PRN) signal to  
decrease the peak electromagnetic radiation level and  
improve EMC performance. The amount of frequency  
spreading is fixed at 10% of the center frequency. When  
SSFM is enabled, the rate of modulation is selected by the  
U
APPLICATIO S  
■
Switching Power Supply Clock Reference  
■
Portable and Battery-Powered Equipment  
■
Precision Programmable Oscillator  
Charge Pump Driver  
user. The three possible modulation rates are f /16,  
OUT  
■
f
/32 and f /64.  
OUT  
OUT  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
150kHz to 30MHz Output  
Frequency Spectrum  
(9kHz Res BW)  
2.25MHz, 2.5V/8A Step-Down Regulator  
0
–10  
–20  
–30  
–40  
0
V
IN  
2.8V TO 5.5V  
SSFM DISABLED  
C
IN  
100µF  
SV TRACK PV  
IN IN  
0.2µH  
V
2.5V  
8A  
C
OUT  
BYP  
+
R
T
SW  
V
OUT1  
OUT2  
LTC3418  
2.2M  
41.2k  
LTC6908-1  
0.1µF  
PGOOD  
PGND  
SGND  
C
OUT  
GND  
SET  
100µF  
×2  
RUN/SS  
44.2k  
I
TH  
1000pF  
SSFM ENABLED  
–10  
–20  
–30  
–40  
4.99k SYNC/MODE  
V
FB  
MOD  
690812 TA01a  
820pF  
4.32k  
2k  
f
= 10MHz • 10k/R  
SET  
OUT  
150kHz  
30MHz  
FREQUENCY  
(FUNDAMENTAL AND HARMONICS SHOWN)  
690812 TA01b  
690812fa  
1
1234567...16

中文翻译

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