ASM3P2107A D

ASM3P2107A
Product Preview
Peak EMI Reducing
Solution
Description
The ASM3P2107A is a versatile spread spectrum frequency
modulator designed specifically for input clock frequencies from
12 MHz to 22 MHz. The ASM3P2107A can generate an EMI reduced
clock from crystal, ceramic resonator, or system clock.
The ASM3P2107A reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of down
stream clock and data dependent signals. The ASM3P2107A 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 ASM3P2107A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented in a
proprietary all digital method.
The ASM3P2107A 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.’
Applications
The ASM3P2107A is targeted towards EMI management for high
speed digital applications such as PC peripheral devices, consumer
electronics and embedded controller systems.
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SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
XIN/CLKIN
1
NC
NC
XOUT
VDD
GND
CLOCKOUT
NC
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
Features
• FCC Approved Method of EMI Attenuation
• Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
• Input Frequency Range: 12 MHz to 22 MHz
• Internal Loop Filter Minimizes External Components and Board
•
•
•
•
•
•
Space
Frequency Deviation: − 0.8% (Typ) @ 20 MHz
Low Cycle−to−Cycle Jitter
5.0 V ± 5% Operating Voltage Range
TTL or CMOS Compatible Outputs
Available in 8−pin TSSOP and SOIC Package
These are Pb−Free Devices
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2011
August, 2011 − Rev. P2
1
Publication Order Number:
ASM3P2107A/D
ASM3P2107A
VDD
PLL
Modulation
XIN
Frequency
Divider
Crystal
Oscillator
XOUT
Feedback
Divider
Loop
Filter
Phase
Detector
VCO
Output
Divider
CLOCKOUT
GND
Figure 1. Block Diagram
Table 1. 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 (5 V).
7
NC
−
No connect.
8
NC
−
No connect.
Table 2. ABSOLUTE MAXIMUM RATINGS
Symbol
VDD, VIN
TSTG
Parameter
Rating
Unit
Voltage on any pin with respect to Ground
−0.5 to +7.0
V
Storage temperature
−65 to +125
°C
0 to 70
°C
°C
TA
Operating temperature
Ts
Max. Soldering Temperature (10 sec)
260
TJ
Junction Temperature
150
°C
2
KV
TDV
Static Discharge Voltage (As per JEDEC STD22− 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.
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2
ASM3P2107A
Table 3. 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
−
mA
IIH
Input high current
−
66
−
mA
IXOL
XOUT output low current (@ 0.4, VDD = 5 V)
−
3
−
mA
IXOH
XOUT output high current (@ 2.5 V, VDD = 5 V)
−
3
−
mA
VOL
Output low voltage (VDD = 5 V, IOL = 20 mA)
−
−
0.4
V
VOH
Output high voltage (VDD = 5 V, IOH = 20 mA)
2.5
−
−
V
ICC
Dynamic supply current normal mode
(5 V, 18 MHz and 15 pF loading)
−
40
−
mA
IDD
Static supply current standby mode
−
40
−
mA
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
−
W
Min
Typ
Max
Unit
Input frequency
12
−
22
MHz
Output frequency
12
−
22
MHz
Input Frequency = 12 MHz
−
−2.13
−
%
Input Frequency = 22 MHz
−
−0.62
−
ZOUT
Table 4. AC ELECTRICAL CHARACTERISTICS
Symbol
fIN
MODOUT
fd
Parameter
Frequency Deviation
tLH (Note 1)
Output rise time (measured at 0.8 V to 2.0 V)
−
440
−
pS
tHL (Note 1)
Output fall time (measured at 2.0 V to 0.8 V)
−
300
−
pS
tJC
Jitter (cycle to cycle)
−
−
360
pS
tD
Output duty cycle
45
50
55
%
1. VDD = +5 V, Input Frequency = 18 MHz, tLH and tHL are measured into a capacitive load of 15 pF
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3
ASM3P2107A
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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4
ASM3P2107A
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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5
ASM3P2107A
Table 5. ORDERING INFORMATION
Part Number
Marking
Package Type
Temperature
ASM3P2107AF-08-SR
3P2107AF
8-PIN SOIC, TAPE AND REEL, Pb Free
Commercial
ASM3P2107AF-08-ST
3P2107AF
8-PIN SOIC, TUBE, Pb Free
Commercial
ASM3P2107AF-08-TR
3P2107AF
8-PIN TSSOP, TAPE AND REEL, Pb Free
Commercial
ASM3P2107AF-08-TT
3P2107AF
8-PIN TSSOP, TUBE, Pb Free
Commercial
ASM3P2107AG-08-SR
3P2107AG
8-PIN SOIC, TAPE AND REEL, Green
Commercial
ASM3P2107AG-08-ST
3P2107AG
8-PIN SOIC, TUBE, Green
Commercial
ASM3P2107AG-08-TR
3P2107AG
8-PIN TSSOP, TAPE AND REEL, Green
Commercial
ASM3P2107AG-08-TT
3P2107AG
8-PIN TSSOP, TUBE, Green
Commercial
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
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“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
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ASM3P2107A/D
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