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參數(shù)資料
| 型號： | ADSP-21XX1111 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | ADSP-2100 Family DSP Microcomputers |
| 中文描述： | 的ADSP - 2100系列DSP的微機 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 231K |
| 代理商： | ADSP-21XX1111 |
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ADSP-21mod870
–18–
REV. 0
CAPACITIVE LOADING
Figures 16 and 17 show the capacitive loading characteristics of
the ADSP-21mod870.
C
L
– pF
R
00
200
50
100
150
18
16
12
8
4
T = +85 C
V
DD
= 30V
250
14
10
6
2
Figure 16. Typical Output Rise Time vs. Load Capacitance,
C
L
(at Maximum Ambient Operating Temperature)
C
L
– pF
10
9
8
7
1
0
20.0
20
80
120
160
6
5
4
3
2
NOMINAL
–1
–2
–3
–4
V
O
40
60
100
140
180
Figure 17. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L
(at Maximum Ambient Operating
Temperature)
1.5V
INPUT
OR
OUTPUT
1.5V
Figure 18. Voltage Reference Levels for AC Measure-
ments (Except Output Enable/Disable)
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
.
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,
see Figure 19.
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 approxi-
mated 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 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
19. If multiple pins (such as the data bus) are enabled, the mea-
surement value is that of the first pin to start driving. Figure 20
shows the equivalent device loading for ac measurements.
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 19. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
Figure 20. Equivalent Device Loading for AC Measure-
ments (Including All Fixtures)
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