P2005A [PULSECORE]
Low Frequency EMI Reduction IC; 低频EMI降低IC
| 型号： | P2005A |
| 厂家： | 
PulseCore Semiconductor |
| 描述： | Low Frequency EMI Reduction IC |
| 文件： | 总8页 (文件大小：342K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2006
rev 1.3
P2005A/S
Low Frequency EMI Reduction IC
Features
deviations ranging form ±0.6% to ±3.0%. Refer
Frequency Deviation Selections Table. The P2005A/S
reduces electromagnetic interference (EMI) at the clock
source, allowing system wide reduction of EMI of down
stream clock and data dependent signals. The P2005A/S
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.
•
•
•
FCC approved method of EMI attenuation.
Provides up to 15dB of EMI suppression.
Generates a 1X or ½X low EMI spread spectrum
clock of the input frequency.
•
•
Input frequency range: 8MHz to 32MHz.
Internal
loop
filter
minimizes
external
components and board space.
Frequency deviation:
•
•
•
P2005A: ± 1% to ± 3%
P2005S: ± 0.6% to ± 1.8%
The P2005A/S uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
•
SSON# control pin for spread spectrum enable
and disable options.
•
•
•
•
Low cycle-to-cycle jitter.
The P2005A/S 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’.
3.3V or 5V operating voltage range.
Ultra-low power CMOS design.
Available in 8-pin SOIC and TSSOP.
Product Description
The P2005A/S is a versatile spread spectrum frequency
modulator designed specifically for input clock
frequencies from 8MHz to 32MHz. Refer Output
Frequency Selection Table. The P2005A/S can generate
an EMI reduced clock from crystal, ceramic resonator, or
system clock. The P2005A/S offers various percentage
Applications
The P2005A/S is targeted towards EMI management for
high-speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
VDD
DIV2
SSON#
SR0
BlockDiagram
PLL
Modulation
XIN
Crystal
Frequency
Divider
Oscillator
Output
Divider
Phase
Loop
Filter
VCO
Detector
XOUT
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 1.3
P2005A/S
Pin Configuration
1
2
3
4
8
7
6
5
XIN /CLK
XOUT
ModOUT
SSON#
SR0
P2005A/S
Pin Description
Pin
Pin#
Type
Description
Name
1
2
XIN/CLK
I
Connect to crystal or clock.
Crystal output.
XOUT
O
Digital logic input used to select normal output mode or divide-by-two output mode. When
this pin is HIGH, the frequency of the output clock is the same as the input clock
frequency. When it is tied low, the output frequency is half the input clock frequency. This
pin has an internal pull-up resistor.
3
DIV2
I
4
5
VSS
SR0
P
I
Ground to entire chip. Connect to system ground.
Digital logic input used to select Spreading Range Refer Modulation Output and Spreading
Range Selection Table. This pin has an internal pull-up resistor.
Digital logic input used to enable Spread Spectrum function (Active LOW). Spread
Spectrum function enabled when LOW, disabled when HIGH. This pin has an internal pull-
low resistor.
6
SSON#
I
7
8
ModOUT
VDD
O
P
Spread spectrum clock output.
Power supply for the entire chip (+3.3V or 5.0V)
Output Frequency Selections
Input Frequency
8MHz
4MHz
8MHz
12MHz
6MHz
16MHz
8MHz
20MHz
10MHz
20MHz
24MHz
12MHz
24MHz
28MHz
14MHz
28MHz
32MHz
16MHz
32MHz
0 (1/2 X)
Output
DIV2
Frequency
1 (1X)
12MHz
16MHz
Frequency Deviation Selections as a Function of Input Frequency
Input Frequency Range
Modulation Rate
(KHz)
P/N
SR0
8MHz
± 3.0%
± 2.5%
± 1.8%
± 1.5%
12MHz 16MHz 20MHz 24MHz 28MHz 32MHz
0
1
0
1
± 2.5%
± 2.0%
± 1.5%
± 1.2%
± 2.0%
± 1.8%
± 1.2%
± 1.1%
± 1.8%
± 1.5%
± 1.1%
± 0.9%
± 1.5%
± 1.3%
± 0.9%
± 0.8%
± 1.5%
± 1.3%
± 0.9%
± 0.8%
± 1.3%
± 1.0%
± 0.8%
± 0.6%
P2005A
P2005S
(XIN/20) * 62.5
Low Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 1.3
P2005A/S
Spread Spectrum
The Output Frequency Selection Table and the Frequency Deviations Selections Table illustrate the two possible spread
spectrum options. The optimal setting should minimize system EMI to the fullest without affecting system performance. The
spreading is described as a percentage deviation of the center frequency (Note: The center frequency is the frequency of the
external reference input on CLKIN, Pin1).
Example:
The P2005A/S is designed for communications, digital video and imaging applications. It is not only optimized for operation
in the 8MHz – 32MHz range, but its output frequency can be extended down to one half of the input clock frequency using
the divide-by-two feature. This feature extends low frequency as low as to 4MHz. Setting Pin 3 low (DIV2 = 0; Divide-by-two
mode) sets the output frequency (ModOUT) to half the frequency of the input clock (CLKIN). This is a simple way to generate
a spread spectrum modulated low frequency clock when only a higher frequency signal is available. If you want the output
frequency to be the same as the input, you can either set DIV2=1 or leave it unconnected.
Selecting the P2005A/S’s spread options is a matter of either setting SR0=1 or SR0=0. Setting SR0=0 set as a lower
modulation spread, while setting it to 1 introduces a wider spectral spread in the output clock. Refer Modulation output and
Spreading Selections Tables. The example given in the figure below shows the device set to the divide-by-two mode
(DIV2=0) with a lower spectrum range (SR0=0). The versatility provided by allowing both clock division and spread spectrum
on one chip is already proving to be a popular solution among leading system manufacturers.
P2005A/S Application Schematic
+3.3V
8.832MHz Crystal
CLKIN
1
2
3
4
VDD
8
7
6
5
XOUT
DIV2
VSS
MODOUT
SSON#
SR0
Modulated 4.416MHz is
connected to CLK input
pin of the system
0.1µF
P2005A/S
Low Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
P2005A/S
rev 1.3
Absolute Maximum Ratings
Symbol
Parameter
Voltage on any pin with respect to Ground
Rating
Unit
V
°C
°C
°C
°C
VDD, VIN
TSTG
TA
-0.5 to +7.0
-65 to +125
0 to 70
260
Storage temperature
Operating temperature
Ts
TJ
Max. Soldering Temperature (10 sec)
Junction Temperature
150
Static Discharge Voltage
TDV
2
KV
(As per JEDEC STD22- A114-B)
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
Symbol
Parameter
Min
GND – 0.3
2.0
Typ
Max
0.8
Unit
V
VIL
Input low voltage
-
VIH
Input high voltage
Input low current
-
VDD + 0.3
V
IIL
-
-
-35
µA
(pull-up resistors on inputs SR0, SR1, CP0 and CP1)
Input high current (pull-down resistor on input SSON#)
IIH
-
-
-
3
3
-
35
-
µA
IXOL
IXOH
VOL
VOH
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 = 20mA)
Output high voltage (VDD = 3.3V, IOH = 20mA)
mA
-
0.4
-
V
V
2.5
-
Dynamic supply current normal mode (3.3V, and 15pF
loading)
ICC
6.0
7.0
8.3
mA
IDD
VDD
tON
Static supply current standby mode
-
3.1
-
0.6
3.3
-
5.5
-
mA
V
Operating voltage
Power up time (first locked clock cycle after power up)
Clock output impedance
0.18
50
mS
Ω
ZOUT
-
-
AC Electrical Characteristics
Symbol
Parameter
Min
Typ Max
Unit
fIN
Input frequency
8
-
32
32
16
1.1
MHz
1X Option
8
-
fOUT
Output frequency
MHz
1/2X Option
4
-
tLH*
tHL*
tJC
Output rise time (measured at 0.8V to 2.0V)
Output fall time (measured at 2.0V to 0.8V)
Jitter (cycle to cycle)
0.7
0.9
nS
nS
pS
%
0.6
-
0.8
-
1.0
360
55
tD
Output duty cycle
45
50
*tLH and tHL are measured into a capacitive load of 15pF
Low Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 1.3
P2005A/S
Package Information
8-lead (150-mil) SOIC Package
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Millimeters
Min
Max
0.010
0.069
0.059
0.020
0.010
Min
0.10
1.35
1.25
0.31
0.18
Max
0.25
1.75
1.50
0.51
0.25
A1
A
0.004
0.053
0.049
0.012
0.007
A2
B
C
D
E
0.193 BSC
0.154 BSC
0.050 BSC
0.236 BSC
4.90 BSC
3.91 BSC
1.27 BSC
6.00 BSC
e
H
L
0.016
0°
0.050
8°
0.41
0°
1.27
8°
θ
Low Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 1.3
P2005A/S
8-lead TSSOP (4.40-MM Body)
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Millimeters
Min
Max
Min
Max
A
A1
A2
B
0.043
0.006
0.037
0.012
0.008
0.122
0.177
1.10
0.002
0.033
0.008
0.004
0.114
0.169
0.05
0.85
0.19
0.09
2.90
4.30
0.15
0.95
0.30
0.20
3.10
4.50
c
D
E
e
0.026 BSC
0.252 BSC
0.65 BSC
6.40 BSC
H
L
0.020
0°
0.028
8°
0.50
0°
0.70
8°
θ
Low Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 1.3
P2005A/S
Ordering Codes
Part Number
P2005XF-08ST
P2005XF-08SR
P2005XF-08TT
P2005XF-08TR
P2005XG-08ST
P2005XG-08SR
P2005XG-08TT
Marking
P2005XF
P2005XF
P2005XF
P2005XF
P2005XG
P2005XG
P2005XG
P2005XG
Package type
Temperature
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
8 PIN SOIC, TUBE, Pb Free
8 PIN SOIC, TAPE AND REEL, Pb Free
8 PIN TSSOP, TUBE, Pb Free
8 PIN TSSOP, TAPE AND REEL, Pb Free
8 PIN SOIC, TUBE, Green
8 PIN SOIC, TAPE AND REEL, Green
8 PIN TSSOP, TUBE, Green
P2005XG-08TR
Note: X=A or S
8 PIN TSSOP, TAPE AND REEL, Green
Device Ordering Information
P 2 0 0 5 X F - 0 8 S T
Package:
ST – SOIC, TUBE
SR - SOIC, T/R
TT – TSSOP, TUBE
TR - TSSOP, T/R
PIN COUNT
F = LEAD FREE AND RoHS COMPLIANT PART
G = GREEN PACKAGE, LEAD FREE, and RoHS
PART NUMBER
P = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (-25°C to 85°C)
A = Automotive Temperature Range (-40°C to 125°C)
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
Low Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
November 2006
rev 1.3
P2005A/S
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Copyright © PulseCore Semiconductor
All Rights Reserved
Preliminary Information
Part Number: P2005A/S
Document Version: v1.3
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 Frequency EMI Reduction IC
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Notice: The information in this document is subject to change without notice.
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