asm3p2870a PulseCore Semiconductor, asm3p2870a Datasheet

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asm3p2870a

Manufacturer Part Number
asm3p2870a
Description
Low Power Peak Emi Reducing Solution
Manufacturer
PulseCore Semiconductor
Datasheet
REFOUT
November 2006
rev 1.6
Features
Product Description
The ASM3P2870A is a versatile spread spectrum
frequency modulator designed specifically for a wide
range of clock frequencies. The ASM3P2870A reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of
dependent signals. The ASM3P2870A allows significant
system cost savings by reducing the number of circuit
board layers ferrite beads, shielding that are traditionally
required to pass EMI regulations.
Block Diagram
XOUT
XIN
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
Generates an EMI optimized clock signal at the
output.
Integrated loop filter components.
Operates with a 3.3 / 2.5V Supply.
Operating current less than 4mA.
Low power CMOS design.
Input frequency range: 13MHz to 30MHz for 2.5V.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
Frequency deviation: ±0.75% ( Typ ) @ 22MHz
Input Frequency.
Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin
TSSOP Packages.
Oscillator
Crystal
: 13MHz to 30MHz for 3.3V.
Notice: The information in this document is subject to change without notice.
Low Power Peak EMI Reducing Solution
Frequency
Feedback
PulseCore Semiconductor Corporation
Divider
Divider
V
V
SS
DD
www.pulsecoresemi.com
all clock
Modulation
Detector
Phase
The ASM3P2870A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all digital method.
The ASM3P2870A 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’.
Applications
The ASM3P2870A is targeted towards all portable
devices with very low power requirements like MP3
players and digital still cameras.
Key Specifications
Supply voltages
Cycle-to-Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Description
Loop
Filter
VCO
PLL
V
200pS (Max)
45/55%
F
±0.75% ( Typ ) @ 22MHz
IN
ASM3P2870A
DD
/640
= 3.3V / 2.5V
Specification
Divider
Output
ModOUT

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asm3p2870a Summary of contents

Page 1

... The ASM3P2870A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2870A 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 ...

Page 2

... Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. REFOUT ASM3P2870A XOUT 2 5 ModOUT V XIN / CLKIN Description XIN / CLKIN XOUT ASM3P2870A ModOUT 3 6 REFOUT Description ASM3P2870A ...

Page 3

... 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. Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. Specification 13MHz < CLKIN < 30MHz F /640 IN +0.75%(Typ) @22MHz Parameter ASM3P2870A Rating Unit -0.5 to +4.6 V -65 to +125 °C -40 to +85 °C 260 °C 150 ° ...

Page 4

... LH HL Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. Min V - 0 =2.5V =2.5V 8mA 8mA) 1 2.375 - - Parameter Input Frequency = 13MHz Input Frequency = 30MHz ASM3P2870A Typ Max Unit - 0 0 -35 µ µ 0 1 ...

Page 5

... LH HL Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. Min V - 0 =3.3V =3.3V 8mA 8mA Parameter Input Frequency = 13MHz Input Frequency = 30MHz ASM3P2870A Typ Max Unit - 0 0 -35 µ µ 0 1 ...

Page 6

... Shunt capacitance ESR Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice 510Ω Crystal 14.31818MHz ± 50ppm or better at 25°C -25°C to +85°C -40°C to +85°C 18pF 7pF maximum 25Ω ASM3P2870A ...

Page 7

... Notice: The information in this document is subject to change without notice. 6-pin TSOT-23 Package Dimensions Inches Millimeters Max Min 0.04 0.004 0.00 0.036 0.84 0.02 0.30 0.005 BSC 0.114 BSC 0.06 BSC 0.0374 BSC 0.11 BSC 0.02 0.30 0° 4° 0° ASM3P2870A Max 1.00 0.10 0.90 0.50 0.127 BSC 2.90 BSC 1.60 BSC 0.950 BSC 2.80 BSC 0.50 4° ...

Page 8

... A2 A θ Dimensions Inches Millimeters Min Max Min 0.004 0.010 0.10 0.053 0.069 1.35 0.049 0.059 1.25 0.012 0.020 0.31 0.007 0.010 0.18 0.193 BSC 4.90 BSC 0.154 BSC 3.91 BSC 0.050 BSC 1.27 BSC 0.236 BSC 6.00 BSC 0.016 0.050 0.41 0° 8° 0° ASM3P2870A C L Max 0.25 1.75 1.50 0.51 0.25 1.27 8° ...

Page 9

... Notice: The information in this document is subject to change without notice. 8-Pin TSSOP Package θ A1 Dimensions Inches Millimeters Max Min 0.043 0.006 0.05 0.037 0.85 0.012 0.19 0.008 0.09 0.122 2.90 0.177 4.30 0.026 BSC 0.252 BSC 0.028 0.50 0° 8° 0° ASM3P2870A Max 1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8° ...

Page 10

... November 2006 rev 1.6 Ordering Information Part Number Marking ASM3P2870AF-06OR ASM3P2870AF-08TT 3P2870AF ASM3P2870AF-08TR 3P2870AF ASM3P2870AF-08ST 3P2870AF ASM3P2870AF-08SR 3P2870AF ASM3P2870AG-06OR ASM3P2870AG-08TT 3P2870AG ASM3P2870AG-08TR 3P2870AG ASM3P2870AG-08ST 3P2870AG ASM3P2870AG-08SR 3P2870AG ASM3I2870AF-06OR ASM3I2870AF-08TT 3I2870AF ASM3I2870AF-08TR 3I2870AF ASM3I2870AF-08ST 3I2870AF ASM3I2870AF-08SR 3I2870AF ASM3I2870AG-06OR ASM3I2870AG-08TT 3I2870AG ASM3I2870AG-08TR 3I2870AG ASM3I2870AG-08ST ...

Page 11

... Device Ordering Information Licensed under U.S Patent Nos 5,488,627 and 5,631,921 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. ASM3P2870A R = Tape & Reel Tube or Tray O = TSOT23 U = MSOP J=TSOT26 ...

Page 12

... PulseCore against all claims arising from such use. Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. ASM3P2870A Copyright © PulseCore Semiconductor All Rights Reserved Part Number: ASM3P2870A Document Version: 1 ...

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