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參數(shù)資料
| 型號(hào)： | ADSP-2186L |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 27/34頁 |
| 文件大?。?/td> | 256K |
| 代理商： | ADSP-2186L |
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ADSP-2186L
–27–
REV. A
CAPACITIVE LOADING
Figures 24 and 25 show the capacitive loading characteristics of
the ADSP-2186L.
C
L
–
pF
25
20
0
0
200
20
R
–
–
40
60
80
100
120
140
160
180
15
10
5
V
= 3.0V
T = 85 C
Figure 24. Typical Output Rise Time vs. Load Capacitance,
C
L
(at Maximum Ambient Operating Temperature)
C
L
–
pF
14
0
V
–
50
100
150
250
200
12
4
2
–
2
–
3
10
8
NOMINAL
16
18
6
–
4
–
6
V
= 3.0V
T = +85 C
Figure 25. 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 between 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 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
1.5V
INPUT
OR
OUTPUT
Figure 26. 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
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
(MEASURED)
V
(MEASURED)
Figure 27. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
Figure 28. Equivalent Device Loading for AC Measure-
ments (Including All Fixtures)
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PDF描述 |
|---|---|
| ADSP-2186MBST-266 | DSP Microcomputer |
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| ADSP-2186MKCA-300 | CAP 33PF 50V 1206 |
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|---|---|
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| ADSP2186LBCA-160 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADSP-2186LBCA-160R | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 40MHz 40MIPS 144-Pin CSP-BGA T/R |
| ADSP-2186LBCA-160R3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:DSP Microcomputer |
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