PulseCore ASM3I2187BG-08TT Spread spectrum clock generator for mobile application Datasheet

ASM3P2187A/B
May 2008
rev 0.2
Spread Spectrum Clock Generator for Mobile Applications
Product Description
Features
• Generates a 4X EMI optimized clock signal at the
Output.
• Input frequency
The ASM3P2187A/B is a versatile spread spectrum
frequency modulator designed specifically for a wide
: 12.5MHz to 20MHz
range of clock frequencies. The ASM3P2187A/B reduces
• Output frequency : 50MHz to 80MHz
electromagnetic interference (EMI) at the clock source,
• SSON/PDB option
allowing system wide reduction of EMI of
• Selectable Centre Spread :
dependent
± 0.5%, ± 1.0%
signals.
The
all clock
ASM3P2187A/B
allows
significant system cost savings by reducing the number of
• Low power CMOS design
circuit board layers ferrite beads,
• Supply Voltage : 3.3V ± 0.3V
traditionally required to pass EMI regulations.
• Industrial Temperature range
ASM3P2187A device has an option of Spread ON/OFF
• 8-pin TSSOP Package
and ASM3P2187B device has Powerdown option
shielding that are
• Drop-in replacement for MB88155-412 Device
Application
The ASM3P2187A/B is targeted towards mobile phones,
mobile audio players and PDAs.
Block Diagram
VDD
SEL SSON/PDB
PLL
Modulation
CLKIN/XIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
REFOUT
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
ASM3P2187A/B
May 2008
rev 0.2
Pin Configurations
8
VDD
7
ModOUT
3
6
VSS
SEL 4
5
REFOUT
CLKIN/ XIN 1
8
VDD
7
ModOUT
3
6
VSS
SEL 4
5
REFOUT
CLKIN/ XIN
1
XOUT 2
ASM3P2187A
SSON
XOUT 2
ASM3P2187B
PDB
Pin Description
Pin#
Pin Name
Type
Description
1
CLKIN/XIN
I
External reference Clock input or Crystal connection.
2
XOUT
O
Crystal connection. If using an external reference, this pin must be left
unconnected.
3
SSON / PDB*
I
Modulation enable pin/ Power down pin. Has an Internal pull up resistor
4
SEL
I
Modulation rate setting pin
Centre spread, SEL = “L” : Frequency Deviation ± 0.5%
Centre spread, SEL = “H” : Frequency Deviation ± 1.0%
Has an Internal pull up resistor.
5
REFOUT
O
Non-modulated clock output pin. The Frequency is same as input
frequency. This pin becomes to “L” at power-down.
6
VSS
P
Ground Connection. Connect to system ground.
7
ModOUT
O
Modulated clock output pin
This pin becomes to“L” at power-down.
8
VDD
P
Power Supply Voltage Pin. Connect to +3.3V.
* SSON Pin is available in ASM3P2187A Device and PDB Pin is available in ASM3P2187B Device
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
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ASM3P2187A/B
May 2008
rev 0.2
Modulation Enable Setting Table
SSON
Modulation
L
No Modulation
H
Modulation
Power down Status Table
PDB
Status
L
Power Down Status
H
Operating Status
Spread Range Selection Table
SEL
Deviation @ 15MHz
L
± 0.50%
H
± 1.00%
Absolute Maximum Ratings
Symbol
Rating
Unit
-0.5 to +4.6
V
Input Voltage pin with respect to Ground
VSS-0.5 to VDD+0.5
V
VOUT
Output Voltage pin with respect to Ground
VSS-0.5 to VDD+0.5
V
TSTG
Storage temperature
-55 to +125
°C
VDD
VIN
Parameter
Supply Voltage pin with respect to Ground
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)
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.
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
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ASM3P2187A/B
May 2008
rev 0.2
DC Electrical Characteristics
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
-50
µA
IIH
Input high current
+50
µA
VOL
Output low voltage
VSS
0.4
V
VOH
Output high voltage
2.4
VDD
V
For ModOUT, IOL = 4mA
For REFOUT, IOL = 3mA
For ModOUT, IOH = -4mA
For REFOUT, IOH = -3mA
ICC
Dynamic supply current (Unloaded Outputs)
17
mA
IDD
Static supply current standby mode
(CLKIN/XIN pulled LOW)
8
mA
3.3
3.6
V
Power up time (first locked clock cycle after power up)
2
5
mS
Clock output impedance
50
VDD
tON
ZOUT
Operating voltage
3.3
Ω
CIN
Input Capacitance
7
pF
CL
Load Capacitance
15
pF
AC Electrical Characteristics
Symbol
CLKIN/XIN
CLKOUT
Parameter
Input Clock frequency
Output Clock
frequency
Min
Typ
Max
Unit
MHz
12.5
15
20
REFOUT
12.5
15
20
ModOUT
50
60
80
32.4
MHz
MF
Modulation Frequency
39
52
KHz
tLH*
Output rise time ( Measured from 20% to 80% )
2
2.5
nS
tHL*
Output fall time ( Measured from 80% to 20% )
1.5
2
nS
tJC
Cycle to Cycle Jitter
±250
±325
tJp
Period Jitter (REFOUT)
±150
±200
tD
Output duty cycle
50
55
45
pS
%
*tLH and tHL are measured with a capacitive load of 15pF
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
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ASM3P2187A/B
May 2008
rev 0.2
Output Clock Duty Cycle tD = (tb / ta )
ta
tb
VDD/2
ModOUT,
REFOUT
Cycle –to- Cycle Jitter (tJC = [tn -tn + 1])
ModOUT
tn
tn+1
Note: Cycle-cycle jitter indicates the difference between a certain cycle and the immediately
succeeding (or preceding) cycle
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
5 of 9
ASM3P2187A/B
May 2008
rev 0.2
Typical Crystal Oscillator Circuit
R1 = 510Ω
C1 = 27 pF
C2 =27 pF
Typical Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
14.31818MHz
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
18pF
Shunt capacitance
7pF maximum
ESR
25Ω
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
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ASM3P2187A/B
May 2008
rev 0.2
Package Information
Mechanical Package Outline 8-Pin TSSOP
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Min
Millimeters
Max
A
Min
Max
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°
Note: Controlling dimensions are millimeters
TSSOP – 0.034 grams unit weight
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
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ASM3P2187A/B
May 2008
rev 0.2
Ordering Code
Part Number
Marking
Package Type
Temperature
ASM3P2187AG-08TT
3P2187AG
8-Pin TSSOP, TUBE, Green
Commercial
ASM3P2187AG-08TR
3P2187AG
8-Pin TSSOP, TAPE & REEL, Green
Commercial
ASM3I2187AG-08TT
3I2187AG
8-Pin TSSOP, TUBE, Green
Industrial
ASM3I2187AG-08TR
3I2187AG
8-Pin TSSOP, TAPE & REEL, Green
Industrial
ASM3P2187BG-08TT
3P2187BG
8-Pin TSSOP, TUBE, Green
Commercial
ASM3P2187BG-08TR
3P2187BG
8-Pin TSSOP, TAPE & REEL, Green
Commercial
ASM3I2187BG-08TT
3I2187BG
8-Pin TSSOP, TUBE, Green
Industrial
ASM3I2187BG-08TR
3I2187BG
8-Pin TSSOP, TAPE & REEL, Green
Industrial
Device Ordering Information
A S M 3 P 2 1 8 7 A G - 0 8 T R
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, LEAD FREE, and RoHS
PART NUMBER
X= Automotive
I= Industrial
P or n/c = Commercial
(-40C to +125C) (-40C to +85C)
(0C to +70C)
1 = Clock Generator
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
PulseCore Semiconductor Mixed Signal Product
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
8 of 9
ASM3P2187A/B
May 2008
rev 0.2
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Copyright © PulseCore Semiconductor
All Rights Reserved
Part Number: ASM3P2187A/B
Document Version: 0.2
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003
Many PulseCore Semiconductor products are protected by issued patents or by applications for patent
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of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies. PulseCore reserves
the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors
that may appear in this document. The data contained herein represents PulseCore’s best data and/or estimates at the time of issuance.
PulseCore 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
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Spread Spectrum Clock Generator for Mobile Applications
Notice: The information in this document is subject to change without notice.
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