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ASM3P2180A Peak Reducing EMI Solution
Features
* Generates a 1x EMI optimized clock output. * Input frequency: 6MHz - 10MHz 18MHz - 30MHz * Output frequency: 6MHz - 10MHz 18MHz - 30MHz * Two selectable down spread options. * Selectable frequency range. * Integrated loop filter components. * Operates with a 3.3V supply. * CMOS design.
significant system cost savings by reducing the number of circuit board layers, and shielding that are traditionally required to pass EMI regulations. ASM3P2180A modulates the output of a single 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. ASM3P2180A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method.
* 8-pin SOIC packages.
Product Description
The ASM3P2180A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. ASM3P2180A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. ASM3P2180A allows
Applications
The ASM3P2180A is targeted towards notebook LCD displays, other displays using an LVDS interface, PC peripheral devices and embedded systems.
Block Diagram
VDD
SS%
FS
CLKIN / XIN XOUT Crystal Oscillator
Modulation CLKOUT
PLL
GND
(c)2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 2
Publication Order Number: ASM3P2180/D
ASM3P2180A
Pin Diagram
CLKIN / XIN 1 XOUT 2 3P2180A GND 3 SS% 4
8
NC
7 FS 6 VDD 5 CLKOUT
Pin Description
Pin# 1 2 3 4 5 6 7 8 Pin Name CLKIN / XIN XOUT GND SS% CLKOUT VDD FS NC Type I O P I O P I Description Crystal connection or external reference clock input. Connection for an external crystal. If using an external reference, this pin must be left unconnected. Ground to entire chip. Spread Selection Input. Has an internal pull-up resistor. Modulated Clock Output. Power supply for the entire chip. Frequency selection bit. This pin selects the frequency range of operation. (Refer to the Frequency Range Selection Table). Has an internal pull-up resistor. No connect.
Frequency Range Selection
FS 0 1 Frequency Range (MHz) 6-10 18-30
Spread Selection table
SS% Frequency (MHz) FS=0 FS=1 6 18 8 24 10 30 6 8 10 18 24 30 Deviation (%) (typ) -2 -1.5 -1 -4 -3 -2
0
1
Rev. 2 | Page 2 of 6 | www.onsemi.com
ASM3P2180A
Absolute Maximum Ratings Symbol
VDD, VIN TSTG Ts TJ TDV Storage temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B)
Parameter
Rating
-0.5 to +4.6 -65 to +125 260 150 2
Unit
V C C C KV
Voltage on any pin with respect to Ground
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.
Operating Conditions Parameter
VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance Input Capacitance
Description
Min
2.8 -40
Max
3.7 +85 15 7
Unit
V C pF pF
DC Electrical Characteristics Symbol
VIL VIH IIL IIH IXOL IXOH VOL VOH ICC IDD * VDD tON ZOUT Input low voltage Input high voltage
Parameter
Min
GND - 0.3 2.0
Typ
Max
0.8 VDD + 0.3 -27 18
Unit
V V A A mA mA
Input low current (pull-up resistors on inputs SS%, FS) Input high current 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 = 4mA) Output high voltage (VDD = 3.3V, IOH = 4mA) Dynamic supply current normal mode (3.3V and 10pF loading) Static supply current standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock output impedance 2.5 10 15 3 4
0.4
V V
25 7
mA mA V mS
2.8
3.3 0.18 50
3.7
*CLKIN pin pulled to GND
Rev. 2 | Page 3 of 6 | www.onsemi.com
ASM3P2180A
AC Electrical Characteristics Symbol
CLKIN Input frequency
Parameter
FS=0 FS=1 FS=0 FS=1
Min
6 18 6 18 1.2 0.8 45
Typ
Max
10 30 10 30
Unit
MHz
CLKOUT tLH* tHL* tJC tD
Output frequency
MHz nS nS pS %
Output rise time (measured at 0.8V to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Output duty cycle
1.3 0.9 325 50
1.4 1.0 55
*tLH and tHL are measured into a capacitive load of 15pF
Typical Test Circuit
+3.3V Crystal XIN C1 XOUT C2 CLKOUT GND CLOAD VDD 0.1uF
Spread spectrum output
(EMI suppressed)
Rev. 2 | Page 4 of 6 | www.onsemi.com
ASM3P2180A
Package Information 8-Pin SOIC Package
E
H
D
A2
A
e A 1 B
C L
D
Dimensions Inches Min
A1 A A2 B C D E e H L 0.004 0.053 0.049 0.012 0.007
Symbol
Max
0.010 0.069 0.059 0.020 0.010
Millimeters Min Max
0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8 0.25 1.75 1.50 0.51 0.25
0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8
Rev. 2 | Page 5 of 6 | www.onsemi.com
ASM3P2180A
Ordering Codes Part Number
ASM3P2180AF-08ST ASM3P2180AF-08SR
Marking
ACT ACT
Package Type
8-pin SOIC, tube, Pb Free 8-pin SOIC, tape and reel, Pb Free
Temperature
0 to +70 C C 0 to +70 C C
A "microdot" placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free.
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003 are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes ON Semiconductor and without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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