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| 型號(hào)： | ADSP-2187N |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | DSP Microcomputer |
| 中文描述： | DSP微機(jī) |
| 文件頁(yè)數(shù)： | 24/48頁(yè) |
| 文件大?。?/td> | 1571K |
| 代理商： | ADSP-2187N |
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ADSP-218xN Series
–24–
REV. 0
Environmental Conditions
Test Conditions
Output Disable Time
Output pins are considered to be disabled when they have
stopped driving and started a transition from the measured
output high or low voltage to a high impedance state. The
output disable time (t
DIS
) is the difference of t
MEASURED
and
t
DECAY
, as shown in
Figure 18
. The time is the interval from
when a reference signal reaches a high or low voltage level
to when the output voltages have changed by 0.5 V from the
measured output high or low voltage.
The decay time, t
DECAY
, is dependent on the capacitive load,
C
L
, and the current load, i
L
, on the output pin. It can be
approximated by the following equation:
from which
is calculated. If multiple pins (such as the data bus) are
disabled, the measurement value is that of the last pin to
stop driving.
Output Enable Time
Output pins are considered to be enabled when they have
made a transition from a high-impedance state to when they
start driving. The output enable time (t
ENA
) is the interval
from when a reference signal reaches a high or low voltage
level to when the output has reached a specified high or low
trip point, as shown in
Figure 18
. If multiple pins (such as
the data bus) are enabled, the measurement value is that of
the first pin to start driving.
Table 14. Thermal Resistance
Rating Description
1
1
Where the Ambient Temperature Rating (T
AMB
) is:
T
AMB
= T
CASE
– (PD ×
θ
CA
)
T
CASE
= Case Temperature in
°
C
PD = Power Dissipation in W
Symbol
θ
CA
LQFP
(
°
C/W)
48
Mini-
BGA
(
°
C/W)
63.3
Thermal Resistance
(Case-to-Ambient)
Thermal Resistance
(Junction-to-Ambient)
Thermal Resistance
(Junction-to-Case)
θ
JA
50
70.7
θ
JC
2
7.4
Figure 16. Voltage Reference Levels for AC
Measurements (Except Output Enable/Disable)
Figure 17. Equivalent Loading for AC Measurements
(Including All Fixtures)
1.5V
OUTPUT
INPUT
12.0V
0.8V
TO
OUTPUT
PIN
50pF
1.5V
I
OH
I
OL
Figure 18. Output Enable/Disable
2.0V
1.0V
t
ENA
REFERENCE
SIGNAL
OUTPUT
t
DECAY
V
OH
(MEASURED)
OUTPUT STOPS
DRIVING
OUTPUT STARTS
DRIVING
t
DIS
t
MEASURED
V
OL
(MEASURED)
V
OH
(MEASURED) – 0.5V
V
OL
(MEASURED) + 0.5V
HIGH-IMPEDANCE STATE. TEST CONDITIONS CAUSE
THIS VOLTAGE LEVEL TO BE APPROXIMATELY 1.5V.
V
OH
(MEASURED)
V
OL
(MEASURED)
t
DECAY
C
-------------------------
0.5
V
i
L
=
t
DIS
t
MEASURED
t
DECAY
–
=
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