參數(shù)資料
型號： ADSP-2187LKST-210
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)： 18/32頁
文件大小： 223K
代理商： ADSP-2187LKST-210
REV. 0
ADSP-2187L
–18–
CAPACITIVE LOADING
Figures 15 and 16 show the capacitive loading characteristics of
the ADSP-2187L.
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 15. 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 16. 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
17. The output disable time (t
DIS
) is the difference between
t
MEASURED
and t
DECAY
, see 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:
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 17. 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 18. 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 18. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
Figure 19. 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
TQFP
50
°
C/W
2
°
C/W
48
°
C/W
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