參數(shù)資料
型號: ADSP-2195MKST-160X
廠商: ANALOG DEVICES INC
元件分類: 數(shù)字信號處理
英文描述: LM2991 Negative Low Dropout Adjustable Regulator; Package: TO-263; No of Pins: 5; Qty per Container: 45; Container: Rail
中文描述: 16-BIT, 160 MHz, OTHER DSP, PQFP144
封裝: METRIC, PLASTIC, LQFP-144
文件頁數(shù): 53/68頁
文件大小: 951K
代理商: ADSP-2195MKST-160X
This information applies to a product under development. Its characteristics and specifications are subject to change with-
out notice. Analog Devices assumes no obligation regarding future manufacturing unless otherwise agreed to in writing.
53
REV. PrA
For current information contact Analog Devices at 800/262-5643
ADSP-2195
September 2001
The load capacitance should include the processor’s
package capacitance (C
IN
). The switching frequency
includes driving the load high and then back low. Address
and data pins can drive high and low at a maximum rate of
1/(2t
CK
). The write strobe can switch every cycle at a
frequency of 1/t
CK
. Select pins switch at 1/(2t
CK
), but selects
can switch on each cycle. For example, estimate P
EXT
with
the following assumptions:
A system with one bank of external data memory—asyn-
chronous RAM (16-bit)
One 64K 16 RAM chip is used with a load of 10 pF
Maximum peripheral speed HCLK = 100 MHz
External data memory writes occur every other cycle, a
rate of 1/(4t
HCLK
), with 50% of the pins switching
The bus cycle time is 100 MHz (t
HCLK
= 10 nsec)
Figure 29. P
EXT
Calculation
P
EXT
O
C
×
V
DD
2
×
f
×
=
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