ON ASM3P2870AF-08SR Low power peak emi reducing solution Datasheet

ASM3P2870A
Low Power Peak EMI
Reducing Solution
Description
The ASM3P2870A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock frequencies.
The ASM3P2870A reduces electromagnetic interference (EMI) at the
clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2870A 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.
The ASM3P2870A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2870A 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 ASM3P2870A is targeted towards all portable devices with
very low power requirements like MP3 players and digital still
cameras.
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TSOT−6
O SUFFIX
CASE 419AF
•
•
•
•
SOIC−8
S SUFFIX
CASE 751BD
PIN CONFIGURATIONS
1
REFOUT
VSS
ModOUT
XOUT
VDD
XIN / CLKIN
6−Pin TSOT−23 Package
(Top View)
Features
•
•
•
•
•
•
TSSOP−8
T SUFFIX
CASE 948AL
1
Generates an EMI Optimized Clock Signal at the Output
Integrated Loop Filter Components
Operates with a 3.3 V / 2.5 V Supply
Operating Current less than 4 mA
Low Power CMOS Design
Input Frequency Range:
13 MHz to 30 MHz for 2.5 V
13 MHz to 30 MHz for 3.3 V
Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
Frequency Deviation: ±0.75% (Typ) @ 22 MHz Input Frequency
Available in 6−pin TSOT−23, 8−pin SOIC and 8−pin TSSOP
Packages
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
VDD
XIN / CLKIN
NC
XOUT
ModOUT
REFOUT
VSS
NC
8−Pin SOIC and TSSOP Packages
(Top View)
KEY SPECIFICATIONS
Specification
Description
Supply Voltages
VDD = 3.3 V / 2.5 V
Cycle−to−Cycle Jitter
200 pS (Max)
Output Duty Cycle
45/55%
Modulation Rate Equation
FIN/640
Frequency Deviation
±0.75% (Typ) @
22 MHz
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
August, 2011 − Rev. 3
1
Publication Order Number:
ASM3P2870A/D
ASM3P2870A
VDD
PLL
Modulation
XIN
XOUT
Frequency
Divider
Crystal
Oscillator
Phase
Detector
Feedback
Divider
Loop
Filter
VCO
Output
Divider
ModOUT
REFOUT
VSS
Figure 1. Block Diagram
Table 1. PIN DESCRIPTION (6−Pin TSOT−23 Package)
Pin#
Pin Name
Type
Description
1
REFOUT
O
Buffered output of the input frequency.
2
XOUT
O
Crystal connection. If using an external reference, this pin must be left unconnected.
3
XIN / CLKIN
I
Crystal connection or external reference frequency input. This pin has dual functions. It can be
connected either to an external crystal or an external reference clock.
4
VDD
P
Power supply for the entire chip.
5
ModOUT
O
Spread spectrum clock output.
6
VSS
P
Ground connection.
Table 2. PIN DESCRIPTION (8−Pin SOIC and TSSOP Packages)
Pin#
Pin Name
Type
1
XIN / CLKIN
I
Crystal connection or external reference frequency input. This pin has dual functions. It can be
connected either to an external crystal or an external reference clock.
Description
2
XOUT
O
Crystal connection. If using an external reference, this pin must be left unconnected.
3
REFOUT
O
Buffered output of the input frequency.
4
NC
−
No connect.
5
VSS
P
Ground connection.
6
ModOUT
O
Spread spectrum clock output.
7
NC
−
No connect.
8
VDD
P
Power supply for the entire chip.
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2
ASM3P2870A
Figure 2. Modulation Profile
Table 3. SPECIFICATIONS
Description
Frequency Range
Specification
13 MHz < CLKIN < 30 MHz
For 2.5 V Supply
For 3.3 V Supply
Modulation Equation
FIN/640
Frequency Deviation
±0.75% (Typ) @ 22 MHz
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
TA
Operating temperature
−40 to +85
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
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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3
ASM3P2870A
Table 5. DC ELECTRICAL CHARACTERISTICS FOR 2.5 V SUPPLY
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.)
Parameter
Symbol
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
mA
IIH
Input high current
−
−
35
mA
IXOL
XOUT output low current (@ 0.5 V, VDD = 2.5 V)
−
3
−
mA
IXOH
XOUT output high current (@ 1.8 V, VDD = 2.5 V)
−
3
−
mA
VOL
Output low voltage (VDD = 2.5 V, IOL = 8 mA)
−
−
0.6
V
VOH
Output high voltage (VDD = 2.5 V, IOH = 8 mA)
1.8
−
−
V
IDD
Static supply current (Note 1)
−
1.0
−
mA
ICC
Dynamic supply current (2.5 V, 22 MHz and no load)
−
3.0
−
mA
VDD
Operating Voltage
2.375
2.5
2.625
V
tON
Power−up time (first locked cycle after power−up)
−
−
5
mS
Output impedance
−
50
−
W
Min
Typ
Max
Unit
Input frequency
13
−
30
MHz
Output frequency
13
−
30
MHz
Input Frequency = 13 MHz
−
±1.20
−
%
Input Frequency = 30 MHz
−
±0.5
−
ZOUT
1. XIN / CLKIN pin is pulled low.
Table 6. AC ELECTRICAL CHARACTERISTICS FOR 2.5 V SUPPLY
Symbol
CLKIN
ModOUT
fd
Parameter
Frequency Deviation
tLH (Note 2)
Output rise time (measured from 0.7 V to 1.7 V)
0.7
1.4
1.6
nS
tHL (Note 2)
Output fall time (measured from 1.7 V to 0.7 V)
0.4
0.8
1.0
nS
tJC
Jitter (Cycle−to−Cycle)
−
−
200
pS
tD
Output duty cycle
45
50
55
%
2. tLH and tHL are measured into a capacitive load of 15 pF.
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ASM3P2870A
Table 7. DC ELECTRICAL CHARACTERISTICS FOR 3.3 V SUPPLY
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.)
Parameter
Symbol
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
mA
IIH
Input high current
−
−
35
mA
IXOL
XOUT output low current (@ 0.4 V, VDD = 3.3 V)
−
3
−
mA
IXOH
XOUT output high current (@ 2.5 V, VDD = 3.3 V)
−
3
−
mA
VOL
Output low voltage (VDD = 3.3 V, IOL = 8 mA)
−
−
0.4
V
VOH
Output high voltage (VDD = 3.3 V, IOH = 8 mA)
2.5
−
−
V
IDD
Static supply current (Note 3)
−
1.2
−
mA
ICC
Dynamic supply current (3.3 V, 22 MHz and no load)
−
4.0
−
mA
VDD
Operating Voltage
2.7
3.3
3.6
V
tON
Power−up time (first locked cycle after power−up)
−
−
5
mS
Output impedance
−
45
−
W
Min
Typ
Max
Unit
Input frequency
13
−
30
MHz
Output frequency
13
−
30
MHz
Input Frequency = 13 MHz
−
±1.20
−
%
Input Frequency = 30 MHz
−
±0.5
−
ZOUT
3. XIN / CLKIN pin is pulled low.
Table 8. AC ELECTRICAL CHARACTERISTICS FOR 3.3 V SUPPLY
Symbol
CLKIN
ModOUT
fd
Parameter
Frequency Deviation
tLH (Note 4)
Output rise time (measured from 0.8 V to 2.0 V)
0.4
1.2
1.5
nS
tHL (Note 4)
Output fall time (measured at 2.0 V to 0.8 V)
0.3
0.8
1.1
nS
tJC
Jitter (Cycle−to−Cycle)
−
−
200
pS
tD
Output duty cycle
45
50
55
%
4. tLH and tHL are measured into a capacitive load of 15 pF.
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ASM3P2870A
R1 = 510 W
Crystal
C1 = 27 pF
C2 = 27 pF
Figure 3. Typical Crystal Oscillator Circuit
Table 9. TYPICAL CRYSTAL SPECIFICATIONS
Fundamental AT Cut Parallel Resonant Crystal
Nominal frequency
14.31818 MHz
Frequency tolerance
±50 ppm or better at 25°C
Operating temperature range
−25°C to +85°C
Storage temperature
−40°C to +85°C
Load capacitance
18 pF
Shunt capacitance
7 pF maximum
ESR
25 W
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ASM3P2870A
PACKAGE DIMENSIONS
TSOT−23, 6 LEAD
CASE 419AF−01
ISSUE O
SYMBOL
D
MIN
NOM
A
e
E1
MAX
1.00
A1
0.01
0.05
0.10
A2
0.80
0.87
0.90
b
0.30
c
0.12
E
0.45
0.15
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.95 TYP
L
0.30
L1
0.40
0.20
0.50
0.60 REF
L2
0.25 BSC
0º
θ
8º
TOP VIEW
A2 A
b
q
L
A1
c
L1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
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L2
ASM3P2870A
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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8
ASM3P2870A
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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9
ASM3P2870A
Table 10. ORDERING INFORMATION
Part Number
Marking
ASM3P2870AF−06OR
C4LL
ASM3P2870AF−08TT
Package Type
Temperature
6−Pin TSOT−23, TAPE & REEL, Pb Free
Commercial
3P2870AF
8−Pin TSSOP, TUBE, Pb Free
Commercial
ASM3P2870AF−08TR
3P2870AF
8−Pin TSSOP, TAPE & REEL, Pb Free
Commercial
ASM3P2870AF−08ST
3P2870AF
8−Pin SOIC, TUBE, Pb Free
Commercial
ASM3P2870AF−08SR
3P2870AF
8−Pin SOIC, TAPE & REEL, Pb Free
Commercial
ASM3P2870AG−06OR
C3LL
6−Pin TSOT−23, TAPE & REEL, Green
Commercial
ASM3P2870AG−08TT
3P2870AG
8−Pin TSSOP, TUBE, Green
Commercial
ASM3P2870AG−08TR
3P2870AG
8−Pin TSSOP, TAPE & REEL, Green
Commercial
ASM3P2870AG−08ST
3P2870AG
8−Pin SOIC, TUBE, Green
Commercial
ASM3P2870AG−08SR
3P2870AG
8−Pin SOIC, TAPE & REEL, Green
Commercial
ASM3I2870AF−06OR
C5LL
ASM3I2870AF−08TT
6−Pin TSOT−23, TAPE & REEL, Pb Free
Industrial
3I2870AF
8−Pin TSSOP, TUBE, Pb Free
Industrial
ASM3I2870AF−08TR
3I2870AF
8−Pin TSSOP, TAPE & REEL, Pb Free
Industrial
ASM3I2870AF−08ST
3I2870AF
8−Pin SOIC, TUBE, Pb Free
Industrial
ASM3I2870AF−08SR
3I2870AF
8−Pin SOIC, TAPE & REEL, Pb Free
Industrial
ASM3I2870AG−06OR
C6LL
6−Pin TSOT−23, TAPE & REEL, Green
Industrial
ASM3I2870AG−08TT
3I2870AG
8−Pin TSSOP, TUBE, Green
Industrial
ASM3I2870AG−08TR
3I2870AG
8−Pin TSSOP, TAPE & REEL, Green
Industrial
ASM3I2870AG−08ST
3I2870AG
8−Pin SOIC, TUBE, Green
Industrial
ASM3I2870AG−08SR
3I2870AG
8−Pin SOIC, TAPE & REEL, Green
Industrial
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ASM3P2870A/D
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