參數(shù)資料
型號(hào): ADSP-21mod970
廠商: Analog Devices, Inc.
英文描述: Multi-Port Internet Gateway Processor(多口網(wǎng)關(guān)處理器)
中文描述: 多端口Internet網(wǎng)關(guān)處理器(多口網(wǎng)關(guān)處理器)
文件頁(yè)數(shù): 29/50頁(yè)
文件大小: 980K
代理商: ADSP-21MOD970
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ADSP-21mod970 Preliminary Data Sheet
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Technca
C
= load capacitance,
f
= output switching frequency.
Example:
In an application where external data memory is used and no other outputs are active, power dissipation
is calculated as follows:
Assumptions:
Total Power Dissipation = PINT + (C x V
DD2
x f)
External data memory is accessed every cycle with 50% of the address pins switching.
External data memory writes occur every other cycle with 50% of the data pins switching.
Each address and data pin has a 10 pF total load at the pin.
The application operates at V
DD
= 3.3 V and t
CK
= 30 ns.
PINT = internal power dissipation from Power vs. Frequency graph (Figure 12).
(C x V
DD2
x f) is calculated for each output:
Total power dissipation for this example is PINT + 50.7 mW.
Table 7: Example of Calculating Power Dissipation
# of
Pins
xC
x V
DD2
x f
Address, DMS
Data Output, WR
RD
CLKOUT
8
9
1
1
x 10 pF
x 10 pF
x 10 pF
x 10 pF
x 3.3
2
V
x 3.3
2
V
x 3.3
2
V
x 3.3
2
V
x 33.3 MHz = 29.0 mW
x 16.67 MHz = 16.3 mW
x 16.67 MHz = 1.8 mW
x 33.3 MHz = 3.6 mW
50.7 mW
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