P2027A-08SR Alliance Semiconductor, P2027A-08SR Datasheet

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P2027A-08SR

Manufacturer Part Number
P2027A-08SR
Description
P2027A-08SRGeneral Purpose EMI Reduction IC
Manufacturer
Alliance Semiconductor
Datasheet
查询P2027A供应商
October 2003
rev E
Features
Product Description
The P2027 is a versatile spread spectrum frequency
modulator designed specifically for digital camera
and other digital video and imaging applications. The
P2027 reduces electromagnetic interference (EMI) at
Block Diagram
2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
FCC approved method of EMI attenuation
Provides up to 20 dB of EMI suppression
Generates a low EMI spread spectrum clock of
the input frequency
Optimized for 27 MHz operation
Internal
components and board space
3 selectable spread ranges and 2 modulation
rate options
SSON control pin for spread spectrum enable
and disable options
Low cycle-to-cycle jitter
3.3V operating voltage
16 mA output drives
TTL or CMOS compatible outputs
Low power CMOS design
Supports digital camera and other digital video
and imaging applications
Available in 8 pin SOIC and TSSOP
loop
filter
Notice: The information in this document is subject to change without notice.
minimizes
General Purpose EMI Reduction IC
Alliance Semiconductor
external
the clock source, which provides system wide
reduction of EMI of all clock dependent signals. The
P2027 allows significant system cost savings by
reducing the number of circuit board layers and
shielding that are traditionally required to pass EMI
regulations.
The P2027 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
The P2027 modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized
clock and, more importantly, decreases the peak
amplitudes
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
as other imaging and digital video applications like
DVD and VCD players.
The P2027 is targeted towards DSC market as well
of
its
harmonics.
This
P2027A
results
in

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P2027A-08SR Summary of contents

Page 1

... Lowering EMI by increasing a signal’s bandwidth is called “spread spectrum clock generation”. Applications The P2027 is targeted towards DSC market as well as other imaging and digital video applications like DVD and VCD players. Alliance Semiconductor P2027A of its harmonics. This results in ...

Page 2

... Spread Spectrum function enable when low. This pin has an internal pull-low resistor. 6 ModOUT O Spread Spectrum Clock Output. Digital logic input used to select Spreading Range (see Table 1). This pin 7 SR0 I has an internal pull-up resistor. 8 VDD P Connect to +3.3V Notice: The information in this document is subject to change without notice. Description General Purpose EMI Reduction IC P2027A ...

Page 3

... EMI reduction method for DSC applications and is already gaining popularity among leading manufacturers. Application Schematic for Digital Still Camera Notice: The information in this document is subject to change without notice. Modulation Rate Reserve (Fin/10)*34.72 KHz (Fin/10)*20.83 KHz (Fin/10)*20.83 KHz General Purpose EMI Reduction IC P2027A ...

Page 4

... Alliance EMI reduction IC’s. The figure below is an example of the simulation result. Please visit our web site at www.alsc.comfor information on how to obtain a free copy and demonstration of EMI-lator®. Simulation Result from EMI-lator® Notice: The information in this document is subject to change without notice. General Purpose EMI Reduction IC P2027A ...

Page 5

... LH HL Notice: The information in this document is subject to change without notice. Rating -0 7.0 -65 to +125 0 to +70 GND – 0.3 = 3.3V 3.3V 3.3V mA 3.3V mA) OH General Purpose EMI Reduction IC P2027A Unit V °C °C Min Typ Max Unit - 0 µA - ...

Page 6

... Note: Controlling dimensions are millimeters SOIC – 0.074 grams unit weight Notice: The information in this document is subject to change without notice. Dimensions in millimeters Max Min Nor Max 0.071 1.45 1.63 1.80 0.010 0.10 0.18 0.25 0.069 1.35 1.55 1.75 0.020 0.31 0.41 0.51 0.01 0.10 0.15 0.25 0.202 4.72 4.92 5.12 0.164 3.75 3.95 4.15 1.27 BSC 0.248 5.70 6.00 6.30 0.028 0.30 0.50 0.70 8° 0° 5° 8° General Purpose EMI Reduction IC P2027A ...

Page 7

... TSSOP – 0.034 grams unit weight Notice: The information in this document is subject to change without notice. Dimensions in millimeters Max Min Nor Max 0.047 1.10 0.006 0.05 0.15 0.041 0.80 1.00 1.05 0.012 0.19 0.30 0.008 0.09 0.20 0.122 2.90 3.00 3.10 0.177 4.30 4.40 4.50 0.65 BSC 0.260 6.20 6.40 6.60 0.030 0.45 0.60 0.75 5° 8° 0° 8° General Purpose EMI Reduction IC P2027A ...

Page 8

... October 2003 rev E Ordering Codes Part Number Marking P2027A-08ST P2027A P2027A-08SR P2027A P2027A-08TT P2027A P2027A-08TR P2027A Licensed under US patent Nos 5,488,627 and 5,631,920. Preliminary datasheet. Specification subject to change without notice. Notice: The information in this document is subject to change without notice. Package Type ...

Page 9

... Alliance against all claims arising from such use. Notice: The information in this document is subject to change without notice. Copyright © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: P2027A Document Version: E General Purpose EMI Reduction IC P2027A ...

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