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ASM3P2775A PDF даташит

Спецификация ASM3P2775A изготовлена ​​​​«PulseCore Semiconductor» и имеет функцию, называемую «Low Power Peak EMI Reducing Solution».

Детали детали

Номер произв ASM3P2775A
Описание Low Power Peak EMI Reducing Solution
Производители PulseCore Semiconductor
логотип PulseCore Semiconductor логотип 

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ASM3P2775A Даташит, Описание, Даташиты
November 2006
rev 0.3
Low Power Peak EMI Reducing Solution
ASM3P2775A
Features
Generates an EMI optimized clock signal at the
output.
Integrated loop filter components.
Operates with a 3.3V Supply.
Operating current less than 4mA.
Low power CMOS design.
Input frequency range: 13MHz to 30MHz
Generates a 1X low EMI spread spectrum clock
of the input frequency.
Frequency deviation: ±1.75% (Typ) @14.7MHz
Input Frequency.
Available in 6-pin TSOT-23, 8-pin SOIC and 8-
pin TSSOP packages.
Product Description
The ASM3P2775A is a versatile spread spectrum
frequency modulator designed specifically for a wide
range of clock frequencies. The ASM3P2775A reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2775A 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 ASM3P2775A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all digital method.
The ASM3P2775A 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 ASM3P2775A is targeted towards all portable
devices with very low power requirements like MP3
players and digital still cameras.
Key Specifications
Description
Supply voltages
Cycle-to-Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 3.3V ± 0.3V
200pS (Max)
45/55% (worst case)
FIN/640
±1.75% (Typ) @ 14.7MHz
Block Diagram
VDD
PD
XIN/CLKIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
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.









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ASM3P2775A Даташит, Описание, Даташиты
November 2006
rev 0.3
Pin Configuration (6-pin TSOT- 23 Package)
ASM3P2775A
PD 1
6 VSS
XOUT 2 ASM3P2775A 5 ModOUT
XIN / CLKIN 3
4 VDD
Pin Description
Pin#
1
2
3
4
5
6
Pin Name
PD
XOUT
XIN / CLKIN
VDD
ModOUT
VSS
Type
I
O
I
P
O
P
Description
Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not
used.
Crystal connection. If using an external reference, this pin must be left unconnected.
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.
Power supply for the entire chip.
Spread spectrum clock output.
Ground connection.
Pin Configuration (8-pin SOIC and TSSOP Package)
Pin Description
XIN / CLKIN 1
8 VDD
XOUT 2
PD 3
7 NC
ASM3P2775A
6 ModOUT
NC 4
5 VSS
Pin#
1
2
3
4
5
6
7
8
Pin Name
XIN/CLKIN
XOUT
PD
NC
VSS
ModOUT
NC
VDD
Type
I
O
I
P
O
P
Description
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.
Crystal connection. If using an external reference, this pin must be left unconnected.
Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not
used.
No connect.
Ground connection.
Spread spectrum clock output.
No connect.
Power supply for the entire chip.
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
2 of 10









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ASM3P2775A Даташит, Описание, Даташиты
November 2006
rev 0.3
Modulation Profile
ASM3P2775A
Specifications
Description
Frequency Range
Modulation Equation
Frequency Deviation
Specification
13MHz < CLKIN < 30MHz
FIN/640
±1.75% (Typ) @ 14.7MHz
Absolute Maximum Ratings
Symbol
VDD, VIN
TSTG
TA
Ts
TJ
TDV
Parameter
Voltage on any pin with respect to Ground
Storage temperature
Operating temperature
Max. Soldering Temperature (10 sec)
Junction Temperature
Static Discharge Voltage
(As per JEDEC STD22- A114-B)
Rating
-0.5 to +4.6
-65 to +125
-40 to +85
260
150
2
Unit
V
°C
°C
°C
°C
KV
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.
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
3 of 10










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