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參數(shù)資料
| 型號： | LTC6902 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Multiphase Oscillator with Spread Spectrum Frequency Modulation |
| 中文描述： | 多相擴頻振蕩器頻率調(diào)制 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LTC6902 |
LTC6902
1
6902f
I
2-, 3- or 4-Phase Outputs
I
Optional Spread Spectrum Frequency Modulation
for Improved EMC Performance
I
5kHz to 20MHz Frequency Range
I
One External Resistor Sets the Frequency
I
One External Resistor Sets Percent Frequency
Spreading
I
400
μ
A Typical Supply Current, V
S
= 3V, 1MHz
I
Frequency Error
≤
1.5% Max, 5kHz to 10MHz
(T
A
= 25
°
C)
I
Frequency Error
≤
2% Max, 5kHz to 10MHz
(T
A
= 0
°
C to 70
°
C)
I
±
40ppm/
°
C Temperature Stability
I
Fast Start-Up Time: 50
μ
s to 1.5ms
I
100
CMOS Output Driver
I
Operates from a Single 2.7V to 5.5V Supply
I
Available in 10-Lead MS Package
APPLICATIU
Multiphase Oscillator
with Spread Spectrum
Frequency Modulation
I
Switching Power Supply Clock Reference
I
Portable and Battery-Powered Equipment
I
PDAs
I
Cell Phones
I
Clocking Switched Capacitor Filters
The LTC
6902 is a precision, low power and easy-to-use
oscillator that provides multiphase outputs in a small
package. The oscillator frequency is set by a single exter-
nal resistor (R
SET
). The LTC6902 also provides an optional
spread spectrum frequency modulation (SSFM) capability
that can be activated and controlled by an additional
external resistor (R
MOD
).
The LTC6902’s master oscillator is controlled by the R
SET
resistor and has a range of 100kHz and 20MHz. In order
to accommodate a wider output frequency range, a pro-
grammable divider (divide by 1, 10 or 100) is included.
The integrated programmable multiphase circuit pro-
vides either 2-, 3- or 4-phase waveforms.
The LTC6902’s SSFM capability modulates the oscillator’s
frequency by a pseudorandom noise (PRN) signal to
spread the oscillator’s energy over a wide frequency band.
This spreading decreases the peak electromagnetic radia-
tion level and improves electromagnetic compatibility
(EMC) performance. The amount of frequency spreading
is programmable by a single additional external resistor
(R
MOD
) and is disabled by grounding the MOD pin.
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
+
DIV
PH
OUT1
OUT2
OUT4
OUT3
OUT2
OUT1
SET
MOD
GND
OUT4
OUT3
LTC6902
R
SET
10k
R
MOD
10k
5V
OPEN
6902 TA01
0.1
μ
F
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
500kHz, 4-Phase Clock with 20% Frequency Spreading
FREQUENCY (kHz)
R
–40
–20
0
6902 TA02
–60
–80
–100
400
450
550
600
500
OUTPUT
SPECTRUM
WITH 20%
SPREADING
OUTPUT
SPECTRUM
WITH SSFM
DISABLED
Output Frequency Spectrum With and Without SSFM
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| LTC6902CMS | 功能描述:IC OSC SILICON 20MHZ 10MSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6902CMS#PBF | 功能描述:IC OSC SILICON 20MHZ 10MSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 類型:振蕩器 - 晶體 計數(shù):- 頻率:- 電源電壓:2.3 V ~ 5.5 V 電流 - 電源:1.07mA 工作溫度:-30°C ~ 80°C 封裝/外殼:SOT-665 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:SS迷你型-5D 安裝類型:表面貼裝 其它名稱:AN8955SSMTXLTR |
| LTC6902CMS#PBF | 制造商:Linear Technology 功能描述:Programmable Oscillator IC |
| LTC6902CMS#TR | 功能描述:IC OSC SILICON 20MHZ 10MSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6902CMS#TRPBF | 功能描述:IC OSC SILICON 20MHZ 10MSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
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