ON ASM3P2590A Peak emi reducing solution Datasheet

ASM3P2590A
Peak EMI
Reducing Solution
Features
The ASM3P2590A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all digital method.
• Generates a 1X low EMI optimized clock signal at
the output.
• Integrated loop filter components.
The ASM3P2590A 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 result 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.’
• Operates with a 3.3 / 2.5V Supply.
• Operating current less than 5mA.
• CMOS design.
• Input frequency range
60MHz to 120MHz for 2.5V
60MHz to 120MHz for 3.3V
• Frequency deviation: ±0.75% (Typ) @ 85MHz Output
frequency.
Applications
• Available in 6L-TSOP (6L-TSOT-23) Package.
The ASM3P2590A is targeted towards all portable
Product Description
devices with very low power requirements like MP3
The ASM3P2590A is a versatile spread spectrum
frequency modulator designed specifically for a wide
range of clock frequencies. The ASM3P2590A reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2590A allows significant
system cost savings by reducing the number of circuit
board layers, ferrite beads and shielding that are
traditionally required to pass EMI regulations.
players, MFP, LCD Panel Module and digital still
cameras.
Key Specifications
Description
Specification
Supply voltages
VDD = 3.3V / 2.5V
Cycle-to-Cycle Jitter
±360pS (Typ)
Output Duty Cycle
45/55%
Modulation Rate Equation
FIN/2560
±0.75% (Typ) @ 85MHz
Output
Frequency Deviation
Block Diagram
VDD
SSON
PLL
Modulation
CLKIN
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
VSS
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 1
Publication Order Number:
ASM3P2590/D
ASM3P2590A
Pin Configuration (6L-TSOP Package)
SSON
1
NC
2
ASM3P2590A
CLKIN 3
6
VSS
5
ModOUT
4
VDD
Pin Description
Pin#
Pin Name
Type
Description
1
SSON
I
When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the
spread spectrum. Connect the pin to ground when Spread Spectrum feature is not
required.
2
NC
-
No Connect.
3
CLKIN
I
Clock Input.
4
VDD
P
Power supply for the entire chip.
5
ModOUT
O
Spread spectrum clock output.
6
VSS
P
Ground connection.
Modulation Profile
Specifications
Description
Frequency Range
For 2.5V Supply
For 3.3V Supply
Specification
60MHz < CLKIN < 120MHz
60MHz < CLKIN < 120MHz
Modulation Equation
FIN/2560
Frequency Deviation
±0.75% (Typ) @ 85MHz Output
Rev. 1 | Page 2 of 7 | www.onsemi.com
ASM3P2590A
Absolute Maximum Ratings
Symbol
Rating
Unit
Voltage on any pin with respect to Ground
-0.5 to +4.6
V
Storage temperature
-65 to +125
°C
TA
Operating temperature
-40 to +85
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
TJ
Junction Temperature
150
°C
2
KV
VDD, VIN
TSTG
Parameter
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.
Operating Conditions
Parameter
VDD
Description
Min
Supply Voltage
Max
Unit
2.375
3.6
V
0
+70
°C
Load Capacitance
15
pF
Input Capacitance
7
pF
TA
Operating Temperature (Ambient Temperature)
CL
CIN
DC Electrical Characteristics for 2.5V Supply
Symbol
Parameter
Min
Typ
Max
Unit
VIL
Input low voltage
VSS-0.3
0.8
V
VIH
Input high voltage
2.0
VDD+0.3
V
IIL
Input low current
-35
µA
IIH
Input high current
35
µA
Output low voltage (VDD = 2.5V, IOL = 8mA)
0.6
V
VOL
VOH
Output high voltage (VDD = 2.5V, IOH = 8mA)
IDD
Static supply current
ICC
VDD
tON
ZOUT
1.8
1
V
1.8
Dynamic supply current (2.5V, 85MHz and no load)
Operating voltage
mA
4.0
2.375
2.5
Power-up time (first locked cycle after power-up)
Output impedance
50
Note: 1. CLKIN pin is pulled low.
Rev. 1 | Page 3 of 7 | www.onsemi.com
mA
2.625
V
5
mS
Ω
ASM3P2590A
AC Electrical Characteristics for 2.5V Supply
Symbol
CLKIN
Input frequency
ModOUT
fd
Min
Typ
60
Output frequency
Frequency Deviation
60
Input Frequency = 60MHz
±0.85
Input Frequency = 120MHz
±0.60
Max
Unit
120
MHz
120
MHz
%
1
Output rise time (measured from 0.7V to 1.7V)
0.7
1.8
2.6
nS
1
Output fall time (measured from 1.7V to 0.7V)
0.4
0.9
1.1
nS
tLH
tHL
Parameter
tJC
Jitter (Cycle-to-cycle)
tD
Output duty cycle
±360
pS
45
50
55
%
Min
Typ
Max
Unit
V
Note: 1. tLH and tHL are measured into a capacitive load of 15pF.
DC Electrical Characteristics for 3.3V Supply
Symbol
Parameter
VIL
Input low voltage
VSS-0.3
0.8
VIH
Input high voltage
2.0
VDD+0.3
V
IIL
Input low current
-35
µA
IIH
Input high current
35
µA
VOL
Output low voltage (VDD = 3.3V, IOL = 8mA)
0.4
V
VOH
Output high voltage (VDD = 3.3V, IOH = 8mA)
2.5
1
V
IDD
Static supply current
2.2
mA
ICC
Dynamic supply current (3.3V, 85MHz and no load)
4.5
mA
VDD
Operating voltage
tON
3.0
3.3
Power-up time (first locked cycle after power-up)
ZOUT
Output impedance
3.6
V
5
mS
Ω
45
Note: 1. CLKIN pin is pulled low.
AC Electrical Characteristics for 3.3V Supply
Symbol
CLKIN
ModOUT
fd
Min
Typ
Max
Unit
Input frequency
60
120
MHz
Output frequency
60
120
MHz
Frequency Deviation
Input Frequency = 60MHz
±0.85
Input Frequency = 120MHz
±0.60
%
1
Output rise time (measured from 0.8 to 2.0V)
0.5
1.2
1.8
nS
1
Output fall time (measured at 2.0V to 0.8V)
0.3
0.8
1.1
nS
tLH
tHL
Parameter
tJC
Jitter (cycle-to-cycle)
tD
Output duty cycle
±360
45
Note: 1. tLH and tHL are measured into a capacitive load of 15pF.
Rev. 1 | Page 4 of 7 | www.onsemi.com
50
pS
55
%
ASM3P2590A
Typical Application Schematic
VDD
C1
0.1µF
C2
2.2µF
VDD
ASM3P2590A
Rs
ModOUT
VSS
Rev. 1 | Page 5 of 7 | www.onsemi.com
ModOUT Clock
ASM3P2590A
Package Information
6L-TSOP Package
Dimensions
Symbol
Inches
Min
A
Millimeters
Max
Min
Max
0.04
1.00
A1
0.00
0.004
0.00
0.10
A2
0.033
0.036
0.84
0.90
b
0.012
0.02
0.30
0.50
H
0.005 BSC
0.127 BSC
D
0.114 BSC
2.90 BSC
B
0.06 BSC
1.60 BSC
e
0.0374 BSC
0.950 BSC
C
0.11 BSC
2.80 BSC
L
0.0118
0.02
0.30
0.50
θ
0°
4°
0°
4°
Rev. 1 | Page 6 of 7 | www.onsemi.com
ASM3P2590A
Ordering Information
Part Number
Marking
P3P2590AF-06OR
Y4L
Temperature
Package Type
6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb
Free
0°C to +70°C
A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free.
Licensed under US Patent #5,488,627 and #5,631,921.
Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003.
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
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including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
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