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November 2006  
rev 1.1  
ASM3P2274A  
Low Power 4X Multiplier EMI Reduction IC  
Features  
The ASM3P2274A uses the most efficient and optimized  
modulation profile approved by the FCC and is  
implemented by using a proprietary all digital method.  
•
Generates a 4X EMI optimized clock signal at the  
output.  
•
•
•
•
Integrated loop filter components.  
Operates with a 3.3 / 2.5V Supply.  
Low power CMOS design.  
Input frequency range: 12MHz to 30MHz for 2.5V.  
: 12MHz to 30MHz for 3.3V.  
Frequency deviation: -1.5% (Typ) @66MHz  
Output Frequency.  
Available in 6-pin TSOT-23 Package.  
The ASM3P2274A modulates the output of a single PLL  
in order to “spread” the bandwidth of a synthesized clock,  
and more importantly, decreases 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 frequency generators. Lowering  
EMI by increasing a signal’s bandwidth is called ‘spread  
spectrum clock generation’.  
•
•
Product Description  
Applications  
The ASM3P2274 is  
a versatile Spread Spectrum  
The ASM3P2274A is targeted towards all portable  
devices with very low power requirements like MP3  
players,MFP, LCD Panel Module and digital still cameras.  
Frequency Modulator designed specifically for a wide  
range of clock frequencies. It provides a 4x Spread  
Spectrum Modulated output from an input clock source.  
The ASM3P2274A reduces electromagnetic interference  
(EMI) at the clock source, allowing system wide reduction  
of EMI of all clock dependent signals. The ASM3P2274A  
allows significant system cost savings by reducing the  
number of circuit board layers ferrite beads, shielding  
that are traditionally required to pass EMI regulations.  
Key Specifications  
Description  
Specification  
VDD = 3.3V / 2.5V  
360pS (Typ)  
45/55%  
Supply voltages  
Cycle-to-Cycle Jitter  
Output Duty Cycle  
Modulation Rate Equation  
FIN/640  
-1.5% (Typ) @ 66MHz  
Frequency Deviation  
Output  
Block Diagram  
VDD  
PD  
PLL  
Modulation  
XIN/CLKIN  
XOUT  
Crystal  
Frequency  
Divider  
Oscillator  
Output  
Divider  
Phase  
Loop  
Filter  
VCO  
Detector  
Feedback  
Divider  
ModOUT  
VSS  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018  
www.pulsecoresemi.com  
Notice: The information in this document is subject to change without notice.  
November 2006  
rev 1.1  
ASM3P2274A  
Pin Configuration (6-pin TSOT- 23 Package)  
1
2
3
6
5
4
PD  
VSS  
XOUT  
ASM3P2274A  
ModOUT  
VDD  
XIN / CLKIN  
Pin Description  
Pin# Pin Name Type  
Description  
Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not  
1
2
3
I
O
I
PD  
XOUT  
used.  
Crystal connection. If using an external reference, this pin must be left unconnected.  
Crystal connection or external reference frequency input. This pin has dual functions. It  
can be connected either to an external crystal or an external reference clock.  
XIN / CLKIN  
4
5
6
VDD  
ModOUT  
VSS  
P
O
P
Power supply for the entire chip.  
Spread spectrum clock output (4X output)  
Ground connection.  
Modulation Profile  
Specifications  
Description  
Specification  
12MHz < CLKIN < 30MHz  
12MHz < CLKIN < 30MHz  
For 2.5V Supply  
For 3.3V Supply  
Input Frequency  
Range  
Modulation Equation  
Frequency Deviation  
FIN/640  
-1.5% (Typ) @ 66MHz Output  
Low Power 4X Multiplier EMI Reduction IC  
2 of 8  
Notice: The information in this document is subject to change without notice.  
November 2006  
ASM3P2274A  
rev 1.1  
Absolute Maximum Ratings  
Symbol  
VDD, VIN  
TSTG  
TA  
Ts  
Parameter  
Rating  
-0.5 to +4.6  
-65 to +125  
-40 to +85  
260  
Unit  
V
°C  
°C  
°C  
°C  
Voltage on any pin with respect to Ground  
Storage temperature  
Operating temperature  
Max. Soldering Temperature (10 sec)  
Junction Temperature  
TJ  
150  
Static Discharge Voltage  
(As per JEDEC STD22- A114-B)  
TDV  
2
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  
device reliability.  
DC Electrical Characteristics for 2.5V Supply  
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)  
Symbol  
VIL  
Parameter  
Min  
VSS - 0.3  
Typ  
-
-
-
-
3
3
-
Max  
0.8  
VDD + 0.3  
Unit  
V
V
µA  
µA  
mA  
mA  
V
Input low voltage  
Input high voltage  
Input low current  
Input high current  
VIH  
IIL  
IIH  
2.0  
-
-
-
-
-
1.8  
-
-
2.375  
-
-
-35  
35  
-
-
0.6  
-
2
-
IXOL  
IXOH  
VOL  
VOH  
IDD  
ICC  
VDD  
tON  
XOUT output low current (@0.5V, VDD=2.5V)  
XOUT output high current (@1.8V, VDD=2.5V)  
Output low voltage (VDD = 2.5V, IOL = 8 mA)  
Output high voltage (VDD = 2.5V, IOH = 8 mA)  
Static supply current*  
Dynamic supply current (2.5V, 66MHz and no load)  
Operating voltage  
Power-up time (first locked cycle after power-up)**  
Output impedance  
-
-
V
uA  
mA  
V
mS  
Ω
3.0  
2.5  
-
2.625  
5
-
ZOUT  
50  
* XIN /CLKIN pin and PD pin are pulled low  
** VDD and XIN/CLKIN input are stable, PD pin is made high from low.  
AC Electrical Characteristics for 2.5V Supply  
Symbol  
CLKIN  
Parameter  
Min  
12  
Typ  
-
Max  
30  
Unit  
MHz  
MHz  
Input frequency  
ModOUT  
Output frequency  
48  
-
120  
Output Frequency = 48MHz  
Output Frequency = 120MHz  
-
-
-1.6  
-1.4  
-
-
fd  
Frequency Deviation  
%
tLH*  
tHL*  
tJC  
Output rise time (measured from 0.7V to 1.7V)  
Output fall time (measured from 1.7V to 0.7V)  
Jitter (Cycle to cycle)  
0.5  
0.4  
-
2.0  
1.0  
360  
50  
2.3  
1.2  
-
nS  
nS  
pS  
%
tD  
Output duty cycle  
40  
60  
* tLH and tHL are measured into a capacitive load of 15pF  
Low Power 4X Multiplier EMI Reduction IC  
3 of 8  
Notice: The information in this document is subject to change without notice.  
November 2006  
rev 1.1  
ASM3P2274A  
DC Electrical Characteristics for 3.3V Supply  
(Test condition: All parameters are measured at room temperature (+ 25°C) unless otherwise stated)  
Symbol  
VIL  
Parameter  
Min  
VSS - 0.3  
Typ  
-
-
-
-
3
3
-
Max  
0.8  
VDD + 0.3  
Unit  
V
V
µA  
µA  
mA  
mA  
V
Input low voltage  
Input high voltage  
Input low current  
Input high current  
VIH  
IIL  
IIH  
2.0  
-
-
-
-
-
2.5  
-
-
3.0  
-
-
-35  
35  
-
IXOL  
IXOH  
VOL  
VOH  
IDD  
ICC  
VDD  
tON  
XOUT output low current (@0.4V, VDD=3.3V)  
XOUT output high current (@2.5V, VDD=3.3V)  
Output low voltage (VDD = 3.3V, IOL = 8 mA)  
Output high voltage (VDD = 3.3V, IOH = 8 mA)  
Static supply current*  
Dynamic supply current (3.3V, 66MHz and no load)  
Operating voltage  
Power-up time (first locked cycle after power-up)**  
Output impedance  
-
0.4  
-
2
-
-
V
uA  
mA  
V
mS  
Ω
4.0  
3.3  
-
-
3.6  
5
-
ZOUT  
45  
* XIN /CLKIN pin and PD pin are pulled low  
** VDD and XIN/CLKIN input are stable, PD pin is made high from low.  
AC Electrical Characteristics for 3.3V Supply  
Symbol  
CLKIN  
Parameter  
Min  
12  
Typ  
-
Max  
30  
Unit  
MHz  
MHz  
Input frequency  
ModOUT  
Output frequency  
48  
-
120  
Output Frequency = 48MHz  
Output Frequency = 120MHz  
-
-
-1.6  
-1.4  
-
-
fd  
Frequency Deviation  
%
tLH*  
Output rise time (measured from 0.8 to 2.0V)  
Output fall time (measured at 2.0V to 0.8V)  
Jitter (Cycle to cycle)  
0.4  
0.4  
-
1.3  
0.8  
360  
50  
1.6  
1.1  
-
nS  
nS  
pS  
%
tHL  
*
tJC  
tD  
Output duty cycle  
40  
60  
*tLH and tHL are measured into a capacitive load of 15pF  
Low Power 4X Multiplier EMI Reduction IC  
4 of 8  
Notice: The information in this document is subject to change without notice.  
November 2006  
ASM3P2274A  
rev 1.1  
Typical Crystal Oscillator Circuit  
200KΩ  
R1 = 510Ω  
Crystal  
C1 = 27 pF  
C2 = 27 pF  
Typical Crystal Specifications  
Fundamental AT cut parallel resonant crystal  
Nominal frequency  
Frequency tolerance  
Operating temperature range  
Storage temperature  
Load capacitance  
14.31818MHz  
± 50 ppm or better at 25°C  
-25°C to +85°C  
-40°C to +85°C  
18pF  
Shunt capacitance  
ESR  
7pF maximum  
25 Ω  
Low Power 4X Multiplier EMI Reduction IC  
5 of 8  
Notice: The information in this document is subject to change without notice.  
November 2006  
rev 1.1  
ASM3P2274A  
Package Information  
6-pin TSOT-23 Package  
Dimensions  
Millimeters  
Symbol  
Inches  
Min  
Max  
Min  
Max  
A
A1  
A2  
b
0.04  
1.00  
0.10  
0.90  
0.50  
0.00  
0.033  
0.012  
0.004  
0.036  
0.02  
0.00  
0.84  
0.30  
H
D
B
0.005 BSC  
0.114 BSC  
0.06 BSC  
0.127 BSC  
2.90 BSC  
1.60 BSC  
0.950 BSC  
2.80 BSC  
e
0.0374 BSC  
0.11 BSC  
C
L
0.0118  
0°  
0.02  
4°  
0.30  
0°  
0.50  
4°  
θ
Low Power 4X Multiplier EMI Reduction IC  
6 of 8  
Notice: The information in this document is subject to change without notice.  
November 2006  
rev 1.1  
ASM3P2274A  
Ordering Information  
Part Number  
ASM3P2274AG-06-OR  
ASM3I2274AG-06-OR  
Marking  
Package Type  
6-Pin TSOT-23, TAPE & REEL, Green  
6-Pin TSOT-23, TAPE & REEL, Green  
Temperature  
Commercial  
Industrial  
Z3  
Z6  
Device Ordering Information  
A S M 3 P 2 2 7 4 A F - 0 6 - 0 R  
R = Tape & Reel, T = Tube or Tray  
O = TSOT23  
S = SOIC  
U = MSOP  
E = TQFP  
L = LQFP  
U = MSOP  
P = PDIP  
J=TSOT26  
T = TSSOP  
A = SSOP  
V = TVSOP  
B = BGA  
D = QSOP  
X = SC-70  
Q = QFN  
DEVICE PIN COUNT  
F = LEAD FREE AND RoHS COMPLIANT PART  
G = GREEN PACKAGE, LEAD FREE, and RoHS  
PART NUMBER  
X= Automotive  
I= Industrial  
P or n/c = Commercial  
(0C to +70C)  
(-40C to +125C) (-40C to +85C)  
1 = Reserved  
6 = Power Management  
7 = Power Management  
8 = Power Management  
9 = Hi Performance  
0 = Reserved  
2 = Non PLL based  
3 = EMI Reduction  
4 = DDR support products  
5 = STD Zero Delay Buffer  
PulseCore Semiconductor Mixed Signal Product  
Licensed under U.S Patent Nos 5,488,627 and 5,631,921  
Low Power 4X Multiplier EMI Reduction IC  
7 of 8  
Notice: The information in this document is subject to change without notice.  
November 2006  
rev 1.1  
ASM3P2274A  
Copyright © PulseCore Semiconductor  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Suite 200  
Campbell, CA 95008  
All Rights Reserved  
Part Number: ASM3P2274A  
Document Version: v1.1  
Tel: 408-879-9077  
Fax: 408-879-9018  
www.pulsecoresemi.com  
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003  
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or  
registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their  
respective companies. PulseCore reserves the right to make changes to this document and its products at any time without  
notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein  
represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct  
this data at any time, without notice. If the product described herein is under development, significant changes to these  
specifications are possible. The information in this product data sheet is intended to be general descriptive information for  
potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or  
customer. PulseCore does not assume any responsibility or liability arising out of the application or use of any product  
described herein, and disclaims any express or implied warranties related to the sale and/or use of PulseCore products  
including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual  
property rights, except as express agreed to in PulseCore’s Terms and Conditions of Sale (which are available from  
PulseCore). All sales of PulseCore products are made exclusively according to PulseCore’s Terms and Conditions of Sale.  
The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights,  
trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore does not authorize its products  
for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result  
in significant injury to the user, and the inclusion of PulseCore products in such life-supporting systems implies that the  
manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use.  
Low Power 4X Multiplier EMI Reduction IC  
8 of 8  
Notice: The information in this document is subject to change without notice.