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參數資料
| 型號： | ADSP-2109 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 基準電壓源/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的低壓差穩壓器的反向電流保護 |
| 文件頁數： | 14/36頁 |
| 文件大小： | 333K |
| 代理商： | ADSP-2109 |
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ADSP-2104/ADSP-2109
–14–
REV. 0
POWE R DISSIPAT ION E X AMPLE
T o determine total power dissipation in a specific application,
the following equation should be applied for each output:
C
×
V
DD
2
×
f
C
= load capacitance,
f
= output switching frequency.
E xample:
In an ADSP-2104 application where external data memory is
used and no other outputs are active, power dissipation is
calculated as follows:
Assumptions:
External data memory is accessed every cycle with 50% of the
address pins switching.
External data memory writes occur every other cycle with
50% of the data pins switching.
Each address and data pin has a 10 pF total load at the pin.
T he application operates at V
DD
= 5.0 V and t
CK
= 50 ns.
Total Power Dissipation
=
P
INT
+
(C
×
V
DD2
×
f
)
P
INT
= internal power dissipation (from Figure 7).
(
C
×
V
DD2
×
f
) is calculated for each output:
# of
Pins
3
C
Output
3
V
DD2
×
f
Address,
DMS
8
Data,
WR
RD
CLK OUT
×
10 pF
×
10 pF
×
10 pF
×
10 pF
×
5
2
V
×
5
2
V
×
5
2
V
×
5
2
V
×
20 MHz = 40.0 mW
×
10 MHz = 22.5 mW
×
10 MHz = 2.5 mW
×
20 MHz = 5.0 mW
9
1
1
70.0 mW
T otal power dissipation for this example = P
INT
+ 70.0 mW.
E NVIRONME NT AL CONDIT IONS
Ambient T emperature Rating:
T
AMB
= T
CASE
– (PD
×
θ
C A
)
T
CASE
= Case T emperature in
°
C
PD = Power Dissipation in W
θ
C A
= T hermal Resistance (Case-to-Ambient)
θ
JA
= T hermal Resistance (Junction-to-Ambient)
θ
JC
= T hermal Resistance (Junction-to-Case)
Package
u
JA
u
JC
u
CA
PLCC
27
°
C/W
16
°
C/W
11
°
C/W
SPECIFICATIONS(ADSP-2104/ADSP-2109)
CAPACIT IVE LOADING
Figures 8 and 9 show capacitive loading characteristics.
Figure 8. Typical Output Rise Time vs. Load Capacitance, C
L
(at Maximum Ambient Operating Temperature)
Figure 9. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L
(at Maximum Ambient Operating Temperature)
C
L
– pF
25
150
125
100
75
50
R
V
DD
= 4.5V
8
7
6
5
4
3
2
1
0
175
0
C
L
– pF
25
100
125
50
75
150
V
V
DD
= 4.5V
175
0
5
4
3
2
1
0
–1
–2
–3
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