參數(shù)資料
型號： ADSP-2185LKST-133
廠商： ANALOG DEVICES INC
元件分類： 數(shù)字信號處理
英文描述： DSP Microcomputer
中文描述： 24-BIT, 26.3 MHz, OTHER DSP, PQFP100
封裝： MS-026BED, LQFP-100
文件頁數(shù)： 17/31頁
文件大?。?/td> 223K
代理商： ADSP-2185LKST-133
ADSP-2185L
–17–
REV. A
CAPACITIVE LOADING
Figures 14 and 15 show the capacitive loading characteristics of
the ADSP-2185L.
C
L
– pF
R
00
200
50
100
150
18
16
14
12
2
T = +85
8
C
V
DD
= 3.0V
250
10
8
6
4
Figure 14. Typical Output Rise Time vs. Load Capacitance,
C
L
(at Maximum Ambient Operating Temperature)
C
L
– pF
10
9
–2
0
200
40
80
120
160
8
7
6
5
4
3
2
1
NOMINAL
–3
–4
V
O
–1
20
60
100
140
180
Figure 15. 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 out-
put high or low voltage to a high impedance state, see Figure
16. The output disable time (t
DIS
) is the difference between
t
MEASURED
and t
DECAY
, see Figure 17. 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:
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 disabled,
the measurement value is that of the last pin to stop driving.
1.5V
INPUT
OR
OUTPUT
1.5V
Figure 16. 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, see
Figure 17. 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 17. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
Figure 18. Equivalent Device Loading for AC Measure-
ments (Including All Fixtures)
ENVIRONMENTAL CONDITIONS
Ambient Temperature Rating is shown below:
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
θ
JA
θ
JC
θ
CA
LQFP
50
°
C/W
2
°
C/W
48
°
C/W
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參數(shù)描述
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ADSP-2185M 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ADSP-2185M: 16-bit. 75 MIPS. 2.5v. 2 serial ports. host port. 80 KB RAM Data Sheet (Rev. 0. 10/00)
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