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參數資料
| 型號： | ADSP-2185NBCA-320 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數字信號處理 |
| 英文描述： | LM2941/LM2941C 1A Low Dropout Adjustable Regulator; Package: TO-263; No of Pins: 5; Qty per Container: 45; Container: Rail |
| 中文描述： | 24-BIT, 40 MHz, OTHER DSP, PBGA144 |
| 封裝： | MO-205AC, BGA-144 |
| 文件頁數： | 17/31頁 |
| 文件大小： | 223K |
| 代理商： | ADSP-2185NBCA-320 |
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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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| ADSP-2185NKCA-320 | 功能描述:IC DSP 16BIT 80MHZ 144CSPBGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - DSP（數字式信號處理器） 系列:ADSP-21xx 標準包裝:2 系列:StarCore 類型:SC140 內核 接口:DSI，以太網，RS-232 時鐘速率:400MHz 非易失內存:外部 芯片上RAM:1.436MB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:431-BFBGA，FCBGA 供應商設備封裝:431-FCPBGA（20x20） 包裝:托盤 |
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