ASM3P2811A D

ASM3P2811A/B,
ASM3P2812A/B,
ASM3P2814A/B
Low Power EMI Reduction IC
Description
The ASM3P28XX devices are versatile spread spectrum frequency
modulators designed specifically for a wide range of input clock
frequencies from 10 MHz to 40 MHz. Refer to Input/Output
Frequency Range Selection Table. The ASM3P28XX can generate an
EMI reduced clock from crystal, ceramic resonator, or system clock.
The ASM3P28XX−A and the ASM3P28XX−B offer various
combinations of spread options and percentage deviations. Refer to
Frequency Deviation and Spread Selection Table. These combinations
include Down and Center Spread, and percentage deviation range
from ±0.625% to −3.5%.
The ASM3P28XX reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of down
stream clock and data dependent signals. The ASM3P28XX 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.
The ASM3P28XX 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.’
The ASM3P28XX uses the most efficient and optimized
modulation profile approved by the FCC and is implemented in a
proprietary all−digital method.
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SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
XIN / CLKIN
1
XOUT
VSS
VDD
D_C
FRS
SRS
ModOUT
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
Applications
The ASM3P28XX is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and
high−speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems.
Features
• FCC Approved Method of EMI Attenuation
• Provides up to 15 dB EMI Reduction
• Generates a 1x, 2x and 4x Low EMI Spread Spectrum
• 8 Frequency Deviation Selections:
•
•
•
•
•
•
•
•
•
•
Clock of the Input Frequency
♦ 1x: ASM3P2811A/B
♦ 2x: ASM3P2812A/B
♦ 4x: ASM3P2814A/B
Optimized for Input Frequency Range from 10 MHz to
40 MHz
Internal Loop Filter Minimizes External Components
and Board Space
Selectable Spread Options:
♦ Down Spread and Center Spread
© Semiconductor Components Industries, LLC, 2011
August, 2011 − Rev. 3
1
♦ ±0.625% to −3.5%
Low Inherent Cycle−to−Cycle Jitter
3.3 V Operating Voltage
CMOS/TTL Compatible Inputs and Outputs
Pin−out Compatible with Cypress CY25811, CY25812
and CY25814
Commercial and Industrial Temperature Range
Available in 8−pin SOIC and TSSOP Packages
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Publication Order Number:
ASM3P2811A/D
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
D_C
VDD
SRS FRS
PLL
Modulation
XIN / CLKIN
Frequency
Divider
Crystal
Oscillator
XOUT
Phase
Detector
Feedback
Divider
Loop
Filter
VCO
Output
Divider
ModOUT
VSS
Figure 1. Block Diagram
Table 1. PIN DESCRIPTION
Pin#
Pin Name
Type
Description
1
XIN / CLKIN
I
Crystal connection or external Clock input.
2
VSS
P
Ground to entire chip.
3
D_C
I
Digital logic input used to select Down (LOW) or Center (HIGH) spread options.
(Refer to Frequency Deviation and Spread Selection Table).
This pin has an internal pull−up resistor.
4
SRS
I
Spread range select. Digital logic input used to select frequency deviation
(Refer to Frequency Deviation and Spread Selection Table).
This pin has an internal pull−up resistor.
5
ModOUT
O
Spread spectrum clock output
6
FRS
I
Frequency range select. Digital logic input used to select Input frequency range
(Refer to Input/Output Frequency Range Selection Table).
This pin has an internal pull−up resistor.
7
VDD
P
Power supply for the entire chip.
8
XOUT
O
Crystal connection. If using an external reference, this pin must be left unconnected.
Table 2. INPUT/OUTPUT FREQUENCY RANGE SELECTION
Part Number
FRS (pin 6)
ASM3P2811 (1x)
ASM3P2812 (2x)
ASM3P2814 (4x)
Modulation Rate
Input
(MHz)
Output
(MHz)
Input
(MHz)
Output
(MHz)
Input
(MHz)
0
10−20
10−20
10−20
20−40
10−20
40−80
Input Frequency / 448
1
20−40
20−40
20−40
40−80
20−40
80−160
Input Frequency / 896
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2
Output
(MHz)
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
Table 3. OUTPUT FREQUENCY DEVIATION AND SPREAD SELECTION
Frequency Deviation (%) (Note 1)
FS = 0
FS = 1
Part Number
D_C (pin 3)
SRS (pin 4)
10/20/40 (MHz)
20/40/80 (MHz)
20/40/80 (MHz)
40/80/160 (MHz)
ASM3P28XXA
0
0
−3
−2.5
−2.7
−2.6
0
1
−3.7
−3.4
−3.8
−3.6
1
0
±1.5
±1.2
±1.5
±1.3
1
1
±1.8
±1.6
±1.9
±1.8
0
0
−1.7
−1.0
−1.5
−1.4
0
1
−2.0
−1.5
−2.0
−1.9
1
0
±0.75
±0.6
±0.8
±0.7
1
1
±1.0
±0.75
±1.0
±0.9
ASM3P28XXB
1. Frequency Deviation given in the table is for the Output Frequency Range covering ASM3P2811x / 12x / 14x.
Table 4. ABSOLUTE MAXIMUM RATINGS
Symbol
VDD, VIN
TSTG
Parameter
Rating
Unit
Voltage on any pin with respect to Ground
−0.5 to +4.6
V
Storage temperature
−65 to +125
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
TJ
Junction Temperature
150
°C
2
KV
TDV
Static Discharge Voltage (As per JEDEC STD 22− A114−B)
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 5. OPERATING CONDITIONS
Symbol
Min
Max
Unit
Voltage on any pin with respect to GND
3.0
3.6
V
TA
Operating temperature
−40
+85
°C
CL
Load Capacitance
10
pF
CIN
Input Capacitance
7
pF
VDD
Parameter
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3
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
Table 6. DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Min
Typ
Max
Unit
VIL
Input low voltage
VSS−0.3
0.8
V
VIH
Input high voltage
2
VDD+0.3
V
IIL
Input low current
(Inputs D_C, SRS and FRS are pulled high internally)
−50
mA
IIH
Input high current
50
mA
IXOL
XOUT Output low current (VXOL @ 0.4 V, VDD = 3.3 V)
3
mA
IXOH
XOUT Output high current (VXOH @ 2.5 V, VDD = 3.3 V)
3
mA
VOL
Output low voltage (VDD = 3.3 V, IOL = 5 mA)
0.4
V
VOH
Output high voltage (VDD = 3.3 V, IOH = −5 mA)
ICC
Dynamic supply current (Unloaded Output)
IDD
Static supply current, Standby mode (CLKIN pulled to GND)
VDD
tON
ZOUT
2.5
V
8
Operating voltage
3.0
3.3
Power up time (first locked clock cycle after power up)
Clock out impedance
18
mA
4.5
mA
3.6
V
500
mS
76
W
Table 7. AC ELECTRICAL CHARACTERISTICS
Symbol
fIN
Parameter
Min
Typ
Max
Unit
Input frequency for ASM3P2811/12/13/14 A/B
10
40
MHz
Output frequency for ASM3P2811A/B
10
40
MHz
Output frequency for ASM3P2812A/B
20
80
MHz
Output frequency for ASM3P2814A/B
40
160
MHz
tLH (Note 2)
Output rise time (measured at 0.8 V to 2.0 V)
0.5
0.9
1.2
nS
tHL (Note 2)
Output fall time (measured at 2.0 V to 0.8 V)
0.8
1.0
1.3
nS
fOUT
tJC
Cycle−to−Cycle Jitter (Unloaded Output)
tD
Output duty cycle
pS
±250
45
2. tLH and tHL are measured into a capacitive load of 10 pF.
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4
50
55
%
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
PACKAGE DIMENSIONS
TSSOP8, 4.4x3
CASE 948AL−01
ISSUE O
b
SYMBOL
MIN
NOM
A
E1
E
MAX
1.20
A1
0.05
A2
0.80
b
0.19
0.30
c
0.09
0.20
D
2.90
3.00
3.10
E
6.30
6.40
6.50
E1
4.30
4.40
4.50
0.15
0.90
e
0.65 BSC
L
1.00 REF
L1
0.50
θ
0º
0.60
1.05
0.75
8º
e
TOP VIEW
D
A2
c
q1
A
A1
L1
SIDE VIEW
L
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-153.
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5
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
E1
E
SYMBOL
MIN
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
4.00
MAX
1.27 BSC
e
PIN # 1
IDENTIFICATION
NOM
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
END VIEW
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
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6
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
Table 8. ORDERING INFORMATION
Part Number
Marking
Package Type
Temperature
ASM3P2811AF−08SR
3P2811AFS
SOIC – Tape & Reel, Pb free
Commercial
ASM3P2811AF−08ST
3P2811AFS
SOIC – Tube, Pb free
Commercial
ASM3P2811AF−08TR
3P2811AFT
TSSOP – Tape & Reel, Pb free
Commercial
ASM3P2811AF−08TT
3P2811AFT
TSSOP – Tube, Pb free
Commercial
ASM3P2811BF−08SR
3P2811BFS
SOIC – Tape & Reel, Pb free
Commercial
ASM3P2811BF−08ST
3P2811BFS
SOIC – Tube, Pb free
Commercial
ASM3P2811BF−08TR
3P2811BFT
TSSOP – Tape & Reel, Pb free
Commercial
ASM3P2811BF−08TT
3P2811BFT
TSSOP – Tube, Pb free
Commercial
ASM3P2812AF−08SR
3P2812AFS
SOIC – Tape & Reel, Pb free
Commercial
ASM3P2812AF−08ST
3P2812AFS
SOIC – Tube, Pb free
Commercial
ASM3P2812AF−08TR
3P2812AFT
TSSOP – Tape & Reel, Pb free
Commercial
ASM3P2812AF−08TT
3P2812AFT
TSSOP – Tube, Pb free
Commercial
ASM3P2812BF−08SR
3P2812BFS
SOIC – Tape & Reel, Pb free
Commercial
ASM3P2812BF−08ST
3P2812BFS
SOIC – Tube, Pb free
Commercial
ASM3P2812BF−08TR
3P2812BFT
TSSOP – Tape & Reel, Pb free
Commercial
ASM3P2812BF−08TT
3P2812BFT
TSSOP – Tube, Pb free
Commercial
ASM3P2814AF−08SR
3P2814AFS
SOIC – Tape & Reel, Pb free
Commercial
ASM3P2814AF−08ST
3P2814AFS
SOIC – Tube, Pb free
Commercial
ASM3P2814AF−08TR
3P2814AFT
TSSOP – Tape & Reel, Pb free
Commercial
ASM3P2814AF−08TT
3P2814AFT
TSSOP – Tube, Pb free
Commercial
ASM3P2814BF−08SR
3P2814BFS
SOIC – Tape & Reel, Pb free
Commercial
ASM3P2814BF−08ST
3P2814BFS
SOIC – Tube, Pb free
Commercial
ASM3P2814BF−08TR
3P2814BFT
TSSOP – Tape & Reel, Pb free
Commercial
ASM3P2814BF−08TT
3P2814BFT
TSSOP – Tube, Pb free
Commercial
ASM3I2811AF−08SR
3I2811AFS
SOIC – Tape & Reel, Pb free
Industrial
ASM3I2811AF−08ST
3I2811AFS
SOIC – Tube, Pb free
Industrial
ASM3I2811AF−08TR
3I2811AFT
TSSOP – Tape & Reel, Pb free
Industrial
ASM3I2811AF−08TT
3I2811AFT
TSSOP – Tube, Pb free
Industrial
ASM3I2811BF−08SR
3I2811BFS
SOIC – Tape & Reel, Pb free
Industrial
ASM3I2811BF−08ST
3I2811BFS
SOIC – Tube, Pb free
Industrial
ASM3I2811BF−08TR
3I2811BFT
TSSOP – Tape & Reel, Pb free
Industrial
ASM3I2811BF−08TT
3I2811BFT
TSSOP – Tube, Pb free
Industrial
ASM3I2812AF−08SR
3I2812AFS
SOIC – Tape & Reel, Pb free
Industrial
ASM3I2812AF−08ST
3I2812AFS
SOIC – Tube, Pb free
Industrial
ASM3I2812AF−08TR
3I2812AFT
TSSOP – Tape & Reel, Pb free
Industrial
ASM3I2812AF−08TT
3I2812AFT
TSSOP – Tube, Pb free
Industrial
ASM3I2812BF−08SR
3I2812BFS
SOIC – Tape & Reel, Pb free
Industrial
ASM3I2812BF−08ST
3I2812BFS
SOIC − Tube, Pb free
Industrial
ASM3I2812BF−08TR
3I2812BFT
TSSOP – Tape & Reel, Pb free
Industrial
ASM3I2812BF−08TT
3I2812BFT
TSSOP – Tube, Pb free
Industrial
ASM3I2814AF−08SR
3I2814AFS
SOIC − Tape & Reel, Pb free
Industrial
ASM3I2814AF−08ST
3I2814AFS
SOIC − Tube, Pb free
Industrial
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7
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
Table 8. ORDERING INFORMATION (continued)
Part Number
Marking
Package Type
Temperature
ASM3I2814AF−08TR
3I2814AFT
TSSOP – Tape & Reel, Pb free
Industrial
ASM3I2814AF−08TT
3I2814AFT
TSSOP – Tube, Pb free
Industrial
ASM3I2814BF−08SR
3I2814BFS
SOIC − Tape & Reel, Pb free
Industrial
ASM3I2814BF−08ST
3I2814BFS
SOIC − Tube, Pb free
Industrial
ASM3I2814BF−08TR
3I2814BFT
TSSOP – Tape & Reel, Pb free
Industrial
ASM3I2814BF−08TT
3I2814BFT
TSSOP – Tube, Pb free
Industrial
ASM3P2811AG−08SR
3P2811AGS
SOIC – Tape & Reel, Green
Commercial
ASM3P2811AG−08ST
3P2811AGS
SOIC – Tube, Green
Commercial
ASM3P2811AG−08TR
3P2811AGT
TSSOP – Tape & Reel, Green
Commercial
ASM3P2811AG−08TT
3P2811AGT
TSSOP – Tube, Green
Commercial
ASM3P2811BG−08SR
3P2811BGS
SOIC – Tape & Reel, Green
Commercial
ASM3P2811BG−08ST
3P2811BGS
SOIC – Tube, Green
Commercial
ASM3P2811BG−08TR
3P2811BGT
TSSOP – Tape & Reel, Green
Commercial
ASM3P2811BG−08TT
3P2811BGT
TSSOP – Tube, Green
Commercial
ASM3P2812AG−08SR
3P2812AGS
SOIC – Tape & Reel, Green
Commercial
ASM3P2812AG−08ST
3P2812AGS
SOIC – Tube, Green
Commercial
ASM3P2812AG−08TR
3P2812AGT
TSSOP – Tape & Reel, Green
Commercial
ASM3P2812AG−08TT
3P2812AGT
TSSOP – Tube, Green
Commercial
ASM3P2812BG−08SR
3P2812BGS
SOIC – Tape & Reel, Green
Commercial
ASM3P2812BG−08ST
3P2812BGS
SOIC – Tube, Green
Commercial
ASM3P2812BG−08TR
3P2812BGT
TSSOP – Tape & Reel, Green
Commercial
ASM3P2812BG−08TT
3P2812BGT
TSSOP – Tube, Green
Commercial
ASM3P2814AG−08SR
3P2814AGS
SOIC – Tape & Reel, Green
Commercial
ASM3P2814AG−08ST
3P2814AGS
SOIC – Tube, Green
Commercial
ASM3P2814AG−08TR
3P2814AGT
TSSOP – Tape & Reel, Green
Commercial
ASM3P2814AG−08TT
3P2814AGT
TSSOP – Tube, Green
Commercial
ASM3P2814BG−08SR
3P2814BGS
SOIC – Tape & Reel, Green
Commercial
ASM3P2814BG−08ST
3P2814BGS
SOIC – Tube, Green
Commercial
ASM3P2814BG−08TR
3P2814BGT
TSSOP – Tape & Reel, Green
Commercial
ASM3P2814BG−08TT
3P2814BGT
TSSOP – Tube, Green
Commercial
ASM3I2811AG−08SR
3I2811AGS
SOIC – Tape & Reel, Green
Industrial
ASM3I2811AG−08ST
3I2811AGS
SOIC – Tube, Green
Industrial
ASM3I2811AG−08TR
3I2811AGT
TSSOP – Tape & Reel, Green
Industrial
ASM3I2811AG−08TT
3I2811AGT
TSSOP – Tube, Green
Industrial
ASM3I2811BG−08SR
3I2811BGS
SOIC – Tape & Reel, Green
Industrial
ASM3I2811BG−08ST
3I2811BGS
SOIC – Tube, Green
Industrial
ASM3I2811BG−08TR
3I2811BGT
TSSOP – Tape & Reel, Green
Industrial
ASM3I2811BG−08TT
3I2811BGT
TSSOP – Tube, Green
Industrial
ASM3I2812AG−08SR
3I2812AGS
SOIC – Tape & Reel, Green
Industrial
ASM3I2812AG−08ST
3I2812AGS
SOIC – Tube, Green
Industrial
ASM3I2812AG−08TR
3I2812AGT
TSSOP – Tape & Reel, Green
Industrial
ASM3I2812AG−08TT
3I2812AGT
TSSOP – Tube, Green
Industrial
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8
ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
Table 8. ORDERING INFORMATION (continued)
Part Number
Marking
Package Type
Temperature
ASM3I2812BG−08SR
3I2812BGS
SOIC – Tape & Reel, Green
Industrial
ASM3I2812BG−08ST
3I2812BGS
SOIC − Tube, Green
Industrial
ASM3I2812BG−08TR
3I2812BGT
TSSOP – Tape & Reel, Green
Industrial
ASM3I2812BG−08TT
3I2812BGT
TSSOP – Tube, Green
Industrial
ASM3I2814AG−08SR
3I2814AGS
SOIC − Tape & Reel, Green
Industrial
ASM3I2814AG−08ST
3I2814AGS
SOIC − Tube, Green
Industrial
ASM3I2814AG−08TR
3I2814AGT
TSSOP – Tape & Reel, Green
Industrial
ASM3I2814AG−08TT
3I2814AGT
TSSOP – Tube, Green
Industrial
ASM3I2814BG−08SR
3I2814BGS
SOIC − Tape & Reel, Green
Industrial
ASM3I2814BG−08ST
3I2814BGS
SOIC − Tube, Green
Industrial
ASM3I2814BG−08TR
3I2814BGT
TSSOP – Tape & Reel, Green
Industrial
ASM3I2814BG−08TT
3I2814BGT
TSSOP – Tube, Green
Industrial
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
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associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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PUBLICATION ORDERING INFORMATION
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For additional information, please contact your local
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ASM3P2811A/D
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