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  ON Semiconductor Electronic Components Datasheet  

PCS3P2005A Datasheet

General Purpose Peak EMI Reduction IC

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PCS3P2005A
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General Purpose Peak EMI
Reduction IC
Description
PCS3P2005A is a versatile, 3.3 V/5 V, 1x spread spectrum
frequency modulator designed to reduce electromagnetic interference
(EMI) at the clock source, allowing system wide reduction of EMI of
down stream clock and data dependent signals. The device allows
significant system cost savings by reducing the number of circuit
board layers ferrite beads, shielding and other passive components that
are traditionally required to pass EMI regulations.
PCS3P2005A modulates the output of a 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.’
PCS3P2005A accepts an input from an external reference clock and
locks to a 1x modulated clock output. Two logic pins S0 and D_C
enable selecting one of the 4 different frequency deviations. Refer to
the Deviation Selection Table for more details. Frequency Range
Selection pin enables operation in one of the two frequency ranges.
PCS3P2005A operates over a supply voltage range of 5 V / 3.3 V.
PCS3P2005A is available in 8 Pin TSSOP and SOIC Packages, over
Commercial and Industrial temperature range.
Applications
PCS3P2005A is targeted for use in a broad range of notebook and
desktop PCs and consumer electronic applications.
Features
1x, LVCMOS Peak EMI Reduction
Input Frequency:
10 MHz 30 MHz @ 3.3 V
30 MHz 100 MHz @ 5 V
Output Frequency:
10 MHz 30 MHz @ 3.3 V
30 MHz 100 MHz @ 5 V
Four Different Frequency Deviation Selection
Selectable Spread Options: Down Spread and Center Spread
Frequency Range Selection
Supply Voltage:
5 V ± 0.5 V
3.3 V ± 0.3 V
8 Pin TSSOP, SOIC Package
Commercial and Industrial Temperature Range
These are PbFree Devices
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
SOIC8
S SUFFIX
CASE 751BD
TSSOP8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
CLKIN / XIN
VDD
XOUT
ModOUT
D_C
FRS
GND
S0
PCS3P2005A
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
August, 2011 Rev. P2
1
Publication Order Number:
PCS3P2005A/D


  ON Semiconductor Electronic Components Datasheet  

PCS3P2005A Datasheet

General Purpose Peak EMI Reduction IC

No Preview Available !

PCS3P2005A
FRS
S0
D_C VDD
CLKIN / XIN
XOUT
Crystal
Oscillator
PLL
ModOUT
GND
Figure 1. Block Diagram
Table 1. ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Rating
Unit
VDD, VIN
Voltage on any input pin with respect to Ground
0.5 to +7.0
V
TSTG
Storage temperature
65 to +125
°C
Ts Max. Soldering Temperature (10 sec)
260 °C
TJ Junction Temperature
150 °C
TDV Static Discharge Voltage (As per JEDEC STD22A114B)
2 KV
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. PIN DESCRIPTION
Pin#
Pin Name
Type
1 CLKIN / XIN
I
2 XOUT O
3 D_C
I
4 GND
P
5 S0
I
6 FRS
I
7 ModOUT
O
8 VDD
P
Description
External reference Clock input or Crystal connection.
Crystal connection. If using an external reference, this pin must be left unconnected.
Deviation Selection. Has an internal pullup resistor. Refer to Deviation Selection Table.
Ground connection.
Deviation Selection. Has an internal pullup resistor. Refer to Deviation Selection Table.
Frequency Range Selection. Has an internal pullup resistor.
Buffered Modulated Clock Output.
Power supply for the entire chip (3.3 V/5 V).
Table 3. FREQUENCY RANGE SELECTION TABLE
FRS
Frequency (MHz)
0 10 30
1 30 100
Table 4. DEVIATION SELECTION TABLE
D_C
0
0
1
1
S0 10 MHz
0 4.5
1 2.6
0 ±2.6
1 ±1.7
Deviation (%)
FS = 0
20 MHz
30 MHz
3.6
1.7
2 1
±2 ±1
±1.25
±0.7
30 MHz
4.8
2.7
±2.75
±1.8
FS = 1
80 MHz
3.6
2
±2
±1.25
100 MHz
2.6
1.5
±1.5
±1
http://onsemi.com
2


Part Number PCS3P2005A
Description General Purpose Peak EMI Reduction IC
Maker ON Semiconductor
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