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| 型號： | ADSP-21992 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Mixed Signal DSP Controller With CAN |
| 中文描述： | 混合信號DSP控制器和CAN |
| 文件頁數(shù)： | 43/49頁 |
| 文件大小： | 602K |
| 代理商： | ADSP-21992 |
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This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Analog
Devices assumes no obligation regarding future manufacturing unless otherwise agreed to in writing.
43
REV. PrA
For current information contact Analog Devices at (781) 937-1799
ADSP-21992
August 2002
PRELIMINARY TECHNICAL DATA
The P
EXT
equation is calculated for each class of pins that
can drive as shown in
Table 18
.
A typical power consumption can now be calculated for
these conditions by adding a typical internal power dissipa-
tion with the formula in
Figure 28
.
Where:
P
EXT
is from
Table 18
P
INT
is I
DDINT
2.5V, using the calculation I
DDINT
listed in
Power Dissipation on page 42
Note that the conditions causing a worst case P
EXT
are
different from those causing a worst case P
INT
. Maximum
P
INT
cannot occur while 100% of the output pins are
switching from all ones to all zeros. Note also that it is not
common for an application to have 100% or even 50% of
the outputs switching simultaneously.
Test Conditions
The DSP is tested for output enable, disable, and hold time.
Output Disable Time
Output pins are considered to be disabled when they stop
driving, go into a high impedance state, and start to decay
from their output high or low voltage. The time for the
voltage on the bus to decay by – V is dependent on the
capacitive load, C
L
and the load current, I
L
. This decay time
can be approximated by the equation in
Figure 29
.
The output disable time t
DIS
is the difference between
t
MEASURED
and t
DECAY
as shown in
Figure 30
. The time t
MEASURED
is the interval from when the reference signal switches to
when the output voltage decays –V from the measured
output high or output low voltage. The t
DECAY
is calculated
with test loads C
L
and I
L
, and with –V equal to 0.5 V.
Table 18. P
EXT
Calculation
Pin Type
Address
MSx
WR
Data
CLKOUT
# of Pins
15
1
2
64
1
% Switching
50
0
100
50
100
C
44.7 pF
44.7 pF
44.7 pF
14.7 pF
4.7 pF
f
12.5 MHz
12.5 MHz
25 MHz
12.5 MHz
25 MHz
V
DD
2
10.9 V
10.9 V
10.9 V
10.9 V
10.9 V
= P
EXT
=0.046 W
=0.000 W
=0.024 W
=0.064 W
=0.001 W
P
EXT
=0.135 W
Figure 28. P
TOTAL
(Typical) Calculation
Figure 29. Decay Time Calculation
P
TOTAL
P
=
EXT
P
INT
+
t
DECAY
C
V
I
L
---------------
=
Figure 30. Output Enable/Disable
Figure 31. Equivalent Device Loading for AC
Measurements (Includes All Fixtures)
Figure 32. Voltage Reference Levels for AC
Measurements (Except Output Enable/Disable)
REFERENCE
SIGNAL
t
DIS
OUTPUT STARTS
DRIVING
V
OH
(MEASURED) – DV
V
OL
(MEASURED) + DV
t
MEASURED
V
OH
(MEASURED)
V
OL
(MEASURED)
2.0V
1.0V
HIGH-IMPEDANCE STATE.
TEST CONDITIONS CAUSE THISVOLT-
AGE TO BE APPROXIMATELY 1.5V
OUTPUT STOPS
DRIVING
t
DECAY
t
ENA
+1.5V
50PF
TO
OUTPUT
PIN
IOL
IOH
INPUT
OR
OUTPUT
1.5V
1.5V
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| ADSP-21992YST | 制造商:Analog Devices 功能描述: |
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