ASM3I2508AF-08SR PULSECORE [PulseCore Semiconductor], ASM3I2508AF-08SR Datasheet

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ASM3I2508AF-08SR

Manufacturer Part Number
ASM3I2508AF-08SR
Description
Peak EMI Reducing Solution
Manufacturer
PULSECORE [PulseCore Semiconductor]
Datasheet
February 2007
rev 1.4
Features
Product Description
The ASM3P2508A is a versatile spread spectrum
frequency
electromagnetic interference (EMI) at the clock source.
Block Diagram
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
Generates an EMI optimized clocking signal at
output.
Input frequency – 14.31818MHz.
Frequency outputs:
selectable via I2C
± 1% Centre spread.
Modulation rate: 40KHz.
Byte Write via I2C
Supply voltage range 3.3V ± 0.3V.
Available in 8-pin SOIC Package.
Available in Commercial and Industrial
Temperature ranges.
120MHz (modulated) - default.
72MHz (modulated) or 48MHz (modulated)
modulator.
XOUT
XIN
SDA
SCL
The
Notice: The information in this document is subject to change without notice.
ASM3P2508A
Oscillator
Interface
PulseCore Semiconductor Corporation
Crystal
I2C
Peak EMI Reducing Solution
www.pulsecoresemi.com
reduces
V
V
DD
SS
The ASM3P2508A allows significant system cost savings
by reducing the number of circuit board layers and
shielding that are required to pass EMI regulations. The
ASM3P2508A 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.
The ASM3P2508A has a feature to power down the
72MHz/48MHz output by writing data into specific
registers in the device via I2C. By writing a ‘0’ into bit 1 of
Byte 0, the PLL block generating 72MHz / 48MHz can be
powered down. Writing ‘0’ into bit ‘7’ of Byte 1 selects an
output of 72 MHz on FOUT2CLK while a ‘1’ at the same
location selects a 48 MHz clock output. However, the I2C
block, crystal oscillator, and the PLL block generating
120MHz would be always running.
PLL 1
PLL 2
ASM3P2508A
FOUT2CLK
FOUT1CLK
(72 MHz / 48MHz)
(120MHz)

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ASM3I2508AF-08SR Summary of contents

Page 1

February 2007 rev 1.4 Features • Generates an EMI optimized clocking signal at output. • Input frequency – 14.31818MHz. • Frequency outputs: • 120MHz (modulated) - default. • 72MHz (modulated) or 48MHz (modulated) selectable via I2C • ± 1% Centre ...

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February 2007 rev 1.4 Pin Configuration FOUT1CLK Pin Description Pin Name Type XIN I XOUT FOUT1CLK O FOUT2CLK O SDA I/O SCL Absolute Maximum Ratings Symbol Voltage on any ...

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February 2007 rev 1.4 DC Electrical Characteristics (Test Condition : All the parameters are measured at room temperature (25°C) , unless otherwise stated) Parameter Symbol Overall Supply Current Dynamic Supply Current Static All input pins High-Level ...

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February 2007 rev 1.4 Typical Crystal Oscillator Circuit Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal Frequency Frequency Tolerance Operating temperature range Storage Temperature Load Capacitance Shunt capacitance ESR Notice: The information in this document is subject to ...

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February 2007 rev 1.4 I2C Serial Interface Information The information in this section assumes familiarity with I2C programming. How to program ASM3P2508A through I2C: • Master (host) sends a start bit. • Master (host) sends the write address D4 (H). ...

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February 2007 rev 1.4 An example of a Byte Write via I2C to partially ‘power down’ the device: ASM3P2508A can be partially ‘powered down’ using bit 1 of Byte 0. The organization of the register bits for Byte ‘0’ is ...

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February 2007 rev 1.4 Package Information Symbol θ Notice: The information in this document is subject to change without notice. 8-lead (150-mil) SOIC Package ...

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... ASM3P2508AF-08ST 3P2508AF ASM3P2508AF-08SR 3I2508AF ASM3I2508AF-08ST 3I2508AF ASM3I2508AF-08SR Device Ordering Information Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Notice: The information in this document is subject to change without notice. Package Configuration 8-PIN SOIC, TUBE, Green 8-PIN SOIC, TAPE AND REEL, Green ...

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February 2007 rev 1.4 PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003 © Copyright 2007 ...

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