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參數(shù)資料
| 型號： | ADSP-2103KS-40 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | ADSP-2100 Family DSP Microcomputers |
| 中文描述： | 24-BIT, 10.24 MHz, OTHER DSP, PQFP80 |
| 封裝： | METRIC, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 28/64頁 |
| 文件大?。?/td> | 666K |
| 代理商： | ADSP-2103KS-40 |
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ADSP-21xx
SPECIFICATIONS (ADSP-2103/2162/2164)
–28–
REV. B
T he decay time, t
DECAY
, is dependent on the capacitative load,
C
L
, and the current load, i
L
, on the output pin. It can be
approximated by the following equation:
t
DECAY
=
C
L
×
0.5
V
i
L
from which
t
DIS
=
t
MEASURED
–
t
DECAY
is calculated. If multiple pins (such as the data bus) are dis-
abled, the measurement value is that of the last pin to stop
driving.
Output E nable T ime
Output pins are considered to be enabled when they have made
a transition from a high-impedance state to when they start
driving. T he output enable time (t
E NA
) 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 27. If multiple pins (such as the data bus)
are enabled, the measurement value is that of the first pin to
start driving.
T E ST CONDIT IONS
Figure 26 shows voltage reference levels for ac measurements.
Figure 26. Voltage Reference Levels for AC Measurements
(Except Output Enable/Disable)
Output Disable T ime
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. T he
output disable time (t
DIS
) is the difference of t
MEASURED
and
t
DECAY
, as shown in Figure 27. T he time t
MEASURED
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.
INPUT
OUTPUT
V
DD
2
V
DD
2
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)
TO
OUTPUT
PIN
50pF
I
OH
I
OL
V
DD
2
Figure 27. Output Enable/Disable
Figure 28. Equivalent Device Loading for AC Measurements
(Except Output Enable/Disable)
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