allows significant system cost savings by reducing the
number of circuit board layers and shielding that are
required to pass EMI regulations. The ASM3P2111B
modulates the output of PLL in order to spread the
bandwidth of a synthesized clock, thereby decreasing the
peak amplitudes of its harmonics. This results in
significantly lower system EMI compared to the typical
narrow band signal produced by oscillators and most
clock generators. Lowering EMI by increasing a signal’s
bandwidth is called spread spectrum clock generation.
Modulation rate: 30 KHz.
Supply voltage range: 3.3V ± 0.3V.
Available in 8-pin SOIC Package.
Commercial and Industrial Temperature range.
RoHS Compliant
Applications
ASM3P2111B is targeted towards EMI management for
Product Description
The ASM3P2111B is a versatile spread spectrum
frequency
modulator
that
reduces
electromagnetic
interference (EMI) at the clock source. The ASM3P2111B
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
V
DD
XIN /CLKIN
XOUT
60 MHz
Crystal
Oscillator
PLL1
48 MHz_1
48 MHz_2
48 MHz_1
PLL2
66.6 MHz
Modulated
V
SS
Alliance Semiconductor
2575 Augustine Drive
•
Santa Clara CA
•
Tel: 408-855-4900
•
Fax: 408-855-4999
•
www.alsc.com
May 2005
rev 0.1
Pin Configuration
ASM3P2111B
XIN/ CLKIN
XOUT
V
DD
60 MHz
1
2
3
4
8
7
VSS
66.6 MHz
48 MHz_1
48 MHz_2
ASM3P2111B
6
5
Pin Description
Pin #
1
2
3
4
5
6
7
8
Pin Name
XIN / CLKIN
XOUT
V
DD
60 MHz
48 MHz_2
48 MHz_1
66.6 MHz
V
SS
Type
I
O
P
O
O
O
O
P
Description
Connection to crystal
Connection to crystal
Power supply for the analog and digital blocks (+3.3V)
Clock output-1 60 MHz un-modulated
Clock output-2 48 MHz_2 un-modulated
Clock output-3 48 MHz_1 un-modulated
Clock output-4 66.6 MHz modulated
Ground to entire chip. Connect to System Ground
Peak Reducing EMI Solution
2 of 8
May 2005
rev 0.1
Absolute Maximum Ratings
Symbol
V
DD
, V
IN
T
STG
T
A
T
s
T
J
T
DV
Storage temperature
Operating temperature
Max. Soldering Temperature (10 sec)
Junction Temperature
Static Discharge Voltage
(As per JEDEC STD 22- A114-B)
ASM3P2111B
Parameter
Voltage on any pin with respect to Ground
Rating
-0.5 to +7.0
-65 to +125
0 to 70
260
150
2
Unit
V
°C
°C
°C
°C
KV
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
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