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參數(shù)資料
| 型號： | XCA56011BU95 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 24-BIT DVD DIGITAL SIGNAL PROCESSOR |
| 中文描述： | 8-BIT, 95 MHz, OTHER DSP, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 75/82頁 |
| 文件大?。?/td> | 318K |
| 代理商： | XCA56011BU95 |
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Preliminary Information
MOTOROLA
DSP56011 Technical Data Sheet, Rev. 1
4-3
Design Considerations
Electrical Design Considerations
PRELIMINARY
ELECTRICAL DESIGN CONSIDERATIONS
Use the following list of recommendations to assure correct DSP operation:
Provide a low-impedance path from the board power supply to each V
CC
pin
on the DSP, and from the board ground to each GND pin.
Use at least four 0.01–0.1
μ
F bypass capacitors positioned as close as possible
to the four sides of the package to connect the V
CC
power source to GND.
Ensure that capacitor leads and associated printed circuit traces that connect
to the chip V
CC
and GND pins are less than 0.5 in per capacitor lead.
Use at least a four-layer Printed Circuit Board (PCB) with two inner layers for
V
CC
and GND.
Because the DSP output signals have fast rise and fall times, PCB trace lengths
should be minimal. This recommendation particularly applies to the address
and data buses as well as the IRQA, IRQB, and NMI pins. Maximum Printed
Circuit Board (PCB) trace lengths on the order of 6 inches are recommended.
Consider all device loads as well as parasitic capacitance due to PCB traces
when calculating capacitance. This is especially critical in systems with higher
capacitive loads that could create higher transient currents in the V
CC
and
GND circuits.
All inputs must be terminated (i.e., not allowed to float) using CMOS levels,
Take special care to minimize noise levels on the V
CCP
and GND
P
pins.
If multiple DSP56011 devices are on the same board, check for cross-talk or
excessive spikes on the supplies due to synchronous operation of the devices.
CAUTION
This device contains protective circuitry to
guard against damage due to high static
voltage or electrical fields. However, normal
precautions are advised to avoid application
of any voltages higher than maximum rated
voltages to this high-impedance circuit.
Reliability of operation is enhanced if unused
inputs are tied to an appropriate logic voltage
level (e.g., either GND or V
CC
).
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