ALSC ASM3P2108A-08-TT Peak emi reducing solution Datasheet

ASM3P2108A
July 2005
rev 0.3
Peak EMI Reducing Solution
Features
savings by reducing the number of circuit board layers
ferrite beads, shielding and other passive components
ƒ
FCC approved method of EMI attenuation.
ƒ
Generates a 1X low EMI spread spectrum clock of
ƒ
Input frequency range: 25MHz to 45MHz.
ƒ
Internal loop filter minimizes external components
the input frequency.
that are traditionally required to pass EMI regulations.
The ASM3P2108A uses the most efficient and optimized
and board space.
ƒ
Frequency deviation: - 1.3%( Typ) @32MHz.
ƒ
Low cycle-to-cycle jitter.
ƒ
5.0V ± 5% operating voltage range.
ƒ
TTL or CMOS compatible outputs.
ƒ
Available in 8-pin SOIC and TSSOP Packages.
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The ASM3P2108A 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
Product Description
by oscillators and most frequency generators. Lowering
The ASM3P2108A is a versatile spread spectrum
spectrum clock generation’.
EMI by increasing a signal’s bandwidth is called ‘spread
frequency modulator designed specifically for input clock
frequencies from 25MHz to 45MHz. The ASM3P2108A
Applications
can generate an EMI reduced clock from crystal, ceramic
The ASM3P2108A is targeted towards EMI management
resonator, or system clock.
for high speed digital applications such as PC peripheral
The ASM3P2108A reduces electromagnetic interference
devices, consumer electronics and embedded controller
(EMI) at the clock source, allowing system wide reduction
systems.
of EMI of
down stream clock and data dependent
signals. The ASM3P2108A allows significant system cost
Block Diagram
VDD
PLL
Modulation
XIN
Crystal
Oscillator
XOUT
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
CLOCKOUT
GND
Alliance Semiconductor
2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
Notice: The information in this document is subject to change without notice.
ASM3P2108A
July 2005
rev 0.3
Pin Configuration
XIN / CLKIN
1
XOUT
2
GND
NC
8
NC
7
NC
3
6
VDD
4
5
CLOCKOUT
ASM3P2108A
Pin Description
Pin#
Pin Name
Type
Description
1
XIN/CLKIN
I
Crystal connection or external reference frequency input. This pin has dual functions. It
can be connected to either an external crystal or an external reference clock.
2
XOUT
O
Crystal connection. If using an external reference, this pin must be left unconnected.
3
GND
P
Ground to entire chip.
4
NC
-
No connect.
5
CLOCKOUT
O
Spread spectrum low EMI output.
6
VDD
P
Power supply for the entire chip (5V).
7
NC
-
No connect.
8
NC
-
No connect.
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
2 of 7
ASM3P2108A
July 2005
rev 0.3
Absolute Maximum Ratings
Symbol
Parameter
VDD, VIN
TSTG
Rating
Unit
Voltage on any pin with respect to Ground
-0.5 to +7.0
V
Storage temperature
-65 to +125
°C
TA
Operating temperature
0 to 70
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
TJ
Junction Temperature
150
°C
2
KV
Static Discharge Voltage
TDV
(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
Typ
Max
Unit
VIL
Input low voltage
GND – 0.3
-
0.8
V
VIH
Input high voltage
2.0
-
VDD + 0.3
V
IIL
Input low current
-
44
-
µA
Input high current
-
66
-
µA
IXOL
IIH
XOUT output low current (@ 0.4, VDD = 5V)
-
3
-
mA
IXOH
XOUT output high current (@2.5V, VDD = 5V)
-
3
-
mA
VOL
Output low voltage (VDD = 5V, IOL = 20mA)
-
-
0.4
V
VOH
Output high voltage (VDD = 5V, IOH = 20mA)
Dynamic supply current normal mode
(5V, 32MHz and 15pF loading)
Static supply current standby mode
2.5
-
-
V
-
40
-
mA
-
40
-
µA
VDD
Operating voltage
4.75
5.0
5.25
V
tON
Power up time (first locked clock cycle after power up)
-
0.18
-
mS
Clock out impedance
-
50
-
Ω
ICC
IDD
ZOUT
AC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
fIN
Input frequency
25
-
45
MHz
MODOUT
Output frequency
25
-
-1.98
-0.60
440
45
-
MHz
tLH*
Input Frequency =25MHz
Frequency Deviation
Input Frequency =45MHz
Output rise time (measured at 0.8V to 2.0V)
tHL*
Output fall time (measured at 2.0V to 0.8V)
-
300
-
pS
tJC
Jitter (cycle to cycle)
-
-
360
pS
tD
Output duty cycle
45
50
55
%
fd
%
pS
* VDD = +5V, Input Frequency = 32MHz, tLH and tHL are measured into a capacitive load of 15pF
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
3 of 7
ASM3P2108A
July 2005
rev 0.3
Package Information
8-Pin SOIC Package
H
E
D
A2
A
C
A1
D
θ
e
L
B
Dimensions
Symbol
Inches
Min
Max
Millimeters
Min
Max
A1
0.004
0.010
0.10
0.25
A
0.053
0.069
1.35
1.75
A2
0.049
0.059
1.25
1.50
B
0.012
0.020
0.31
0.51
C
0.007
0.010
0.18
0.25
D
0.193 BSC
4.90 BSC
E
0.154 BSC
3.91 BSC
e
0.050 BSC
1.27 BSC
H
0.236 BSC
6.00 BSC
L
0.016
0.050
0.41
1.27
θ
0°
8°
0°
8°
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2108A
July 2005
rev 0.3
8-Pin TSSOP Package
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Millimeters
Min
Max
Min
Max
A
……
0.043
…..
1.10
A1
0.002
0.006
0.05
0.15
A2
0.033
0.037
0.85
0.95
B
0.008
0.012
0.19
0.30
c
0.004
0.008
0.09
0.20
D
0.114
0.122
2.90
3.10
E
0.169
0.177
4.30
4.50
e
0.026 BSC
0.65 BSC
H
0.252 BSC
6.40 BSC
L
0.020
0.028
0.50
0.70
θ
0°
8°
0°
8°
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2108A
July 2005
rev 0.3
Ordering Codes
Marking
Part Number
Package
Temperature
ASM3P2108AF-08-SR
3P2108AF
8-PIN SOIC, TAPE AND REEL, Pb Free
Commercial
ASM3P2108AF-08-ST
3P2108AF
8-PIN SOIC, TUBE, Pb Free
Commercial
ASM3P2108AF-08-TR
3P2108AF
8-PIN TSSOP, TAPE AND REEL, Pb Free
Commercial
ASM3P2108AF-08-TT
3P2108AF
8-PIN TSSOP, TUBE, Pb Free
Commercial
ASM3P2108AG-08-SR
3P2108AG
8-PIN SOIC, TAPE AND REEL, Green
Commercial
ASM3P2108AG-08-ST
3P2108AG
8-PIN SOIC, TUBE, Green
Commercial
ASM3P2108AG-08-TR
3P2108AG
8-PIN TSSOP, TAPE AND REEL, Green
Commercial
ASM3P2108AG-08-TT
3P2108AG
8-PIN TSSOP, TUBE, Green
Commercial
ASM3P2108A-08-SR
3P2108A
8-PIN SOIC, TAPE AND REEL
Commercial
ASM3P2108A-08-ST
3P2108A
8-PIN SOIC, TUBE
Commercial
ASM3P2108A-08-TR
3P2108A
8-PIN TSSOP, TAPE AND REEL
Commercial
ASM3P2108A-08-TT
3P2108A
8-PIN TSSOP, TUBE
Commercial
Device Ordering Information
A S M 3 P 2 1 0 8 A G - 0 8 - S T
R = Tape & reel, T = Tube or Tray
O = SOT
S = SOIC
T = TSSOP
A = SSOP
V = TVSOP
B = BGA
Q = QFN
U = MSOP
E = TQFP
L = LQFP
U = MSOP
P = PDIP
D = QSOP
X = SC-70
DEVICE PIN COUNT
F = LEAD FREE AND RoHS COMPLIANT PART
G = GREEN PACKAGE
PART NUMBER
X= Automotive
I= Industrial
P or n/c = Commercial
(-40C to +125C) (-40C to +85C)
(0C to +70C)
1 = Reserved
2 = Non PLL based
3 = EMI Reduction
4 = DDR support products
5 = STD Zero Delay Buffer
6 = Power Management
7 = Power Management
8 = Power Management
9 = Hi Performance
0 = Reserved
ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
6 of 7
ASM3P2108A
July 2005
rev 0.3
Alliance Semiconductor Corporation
2575 Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
Fax: 408-855-4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Preliminary Information
Part Number: ASM3P2108A
Document Version: v0.3
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are
trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their
respective companies. Alliance reserves the right to make changes to this document and its products at any time without
notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein
represents Alliance's best data and/or estimates at the time of issuance. Alliance 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
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including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual
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assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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