LTC6902 Linear Technology, LTC6902 Datasheet
LTC6902
Manufacturer Part Number
LTC6902
Description
Multiphase Oscillator
Manufacturer
Linear Technology
Datasheet
1.LTC6902.pdf
(16 pages)
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www.DataSheet4U.com
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
2-, 3- or 4-Phase Outputs
Optional Spread Spectrum Frequency Modulation
for Improved EMC Performance
5kHz to 20MHz Frequency Range
One External Resistor Sets the Frequency
One External Resistor Sets Percent Frequency
Spreading
400 A Typical Supply Current, V
Frequency Error 1.5% Max, 5kHz to 10MHz
(T
Frequency Error 2% Max, 5kHz to 10MHz
(T
Fast Start-Up Time: 50 s to 1.5ms
100 CMOS Output Driver
Operates from a Single 2.7V to 5.5V Supply
Available in 10-Lead MS Package
Switching Power Supply Clock Reference
Portable and Battery-Powered Equipment
PDAs
Cell Phones
Clocking Switched Capacitor Filters
40ppm/ C Temperature Stability
500kHz, 4-Phase Clock with 20% Frequency Spreading
A
A
= 25 C)
= 0 C to 70 C)
OPEN
0.1 F
U
5V
V
DIV
PH
OUT1
OUT2
+
R
R
LTC6902
MOD
SET
10k
OUT4
OUT3
10k
MOD
GND
SET
U
S
= 3V, 1MHz
6902 TA01
OUT4
OUT3
OUT2
OUT1
DESCRIPTIO
The LTC
oscillator that provides multiphase outputs in a small
package. The oscillator frequency is set by a single exter-
nal resistor (R
spread spectrum frequency modulation (SSFM) capability
that can be activated and controlled by an additional
external resistor (R
The LTC6902’s master oscillator is controlled by the R
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
Output Frequency Spectrum With and Without SSFM
) and is disabled by grounding the MOD pin.
Frequency Modulation
®
with Spread Spectrum
6902 is a precision, low power and easy-to-use
–100
–20
–40
–60
–80
Multiphase Oscillator
0
SET
400
). The LTC6902 also provides an optional
SPREADING
SPECTRUM
WITH 20%
U
MOD
OUTPUT
450
FREQUENCY (kHz)
).
500
OUTPUT
SPECTRUM
WITH SSFM
DISABLED
550
600
LTC6902
6902 TA02
1
6902f
SET
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