參數(shù)資料
型號(hào)： ADSP-2183KST-160
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： 24-BIT, 20 MHz, OTHER DSP, PQFP128
封裝： METRIC, PLASTIC, TQFP-128
文件頁(yè)數(shù)： 25/31頁(yè)
文件大?。?/td> 252K
代理商： ADSP-2183KST-160
ADSP-2183
–25–
REV. C
CAPACITIVE LOADING
Figures 22 and 23 show the capacitive loading characteristics of
the ADSP-2183.
C
L
–
pF
R
–
–
00
160
20
40
60
80
100
120
140
25
20
15
10
5
T = +85 C
V
DD
= 3.0V
180
200
Figure 22. Typical Output Rise Time vs. Load Capacitance,
C
L
(at Maximum Ambient Operating Temperature)
C
L
–
pF
18
–
2
0
200
40
80
120
160
16
10
6
2
NOMINAL
14
12
8
4
–
4
–
6
V
O
–
Figure 23. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L
(at Maximum Ambient Operating
Temperature)
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 out-
put disable time (t
DIS
) is the difference of t
MEASURED
and t
DECAY
,
as shown in the Output Enable/Disable diagram. 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 fol-
lowing 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.
1.5V
INPUT
OR
OUTPUT
1.5V
Figure 24. Voltage Reference Levels for AC Measure-
ments (Except Output Enable/Disable)
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 the Output Enable/Disable diagram. If multiple pins (such as
the data bus) are enabled, the measurement value is that of the
first pin to start driving.
2.0V
1.0V
t
ENA
REFERENCE
SIGNAL
OUTPUT
t
DECAY
V
(MEASURED)
OUTPUT STOPS
DRIVING
OUTPUT STARTS
DRIVING
t
DIS
t
MEASURED
V
(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
(MEASURED)
V
(MEASURED)
Figure 25. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
Figure 26. Equivalent Device Loading for AC Measure-
ments (Including All Fixtures)
ENVIRONMENTAL CONDITIONS
Ambient Temperature Rating:
T
AMB
= T
CASE
– (PD
×
θ
CA
)
T
CASE
= Case Temperature in
°
C
PD = Power Dissipation in W
θ
CA
= Thermal Resistance (Case-to-Ambient)
θ
JA
= Thermal Resistance (Junction-to-Ambient)
θ
JC
= Thermal Resistance (Junction-to-Case)
Package
JA
JC
CA
LQFP
Mini-BGA
50
°
C/W
70.7
°
C/W
2
°
C/W
7.4
°
C/W
48
°
C/W
63.3
°
C/W
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