參數(shù)資料
型號: ADSP-2186M
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(wěn)壓器的反向電流保護
文件頁數(shù): 20/40頁
文件大?。?/td> 288K
代理商: ADSP-2186M
REV. 0
–20–
ADSP-2186M
Each address and data pin has a 10 pF total load at the pin.
The application operates at V
DDEXT
= 3.3 V and t
CK
= 30 ns.
Total Power Dissipation
=
P
INT
+ (
C
×
V
DDEXT
2
×
f
)
P
INT
= internal power dissipation from Power vs. Frequency
graph (Figure 15).
(
C
×
V
DDEXT
2
×
f
) is calculated for each output:
# of
Pins
C
V
DDEXT2
f
PD
mW
Parameters
pF
V
3.3
2
3.3
2
3.3
2
3.3
2
MHz
Address
Data Output,
WR
RD
CLKOUT,
DMS
7
9
1
2
10
10
10
10
16.67
16.67
16.67
33.3
12.7
16.3
1.8
7.2
38.0
Total power dissipation for this example is P
INT
+ 38.0 mW.
Output Drive Currents
Figure 14 shows typical I-V characteristics for the output drivers
on the ADSP-2186M. The curves represent the current drive
capability of the output drivers as a function of output voltage.
V
OH
V
OL
SOURCE VOLTAGE
V
0
0.5
1.0
S
60
0
20
40
60
40
20
V
DDEXT
= 3.6V @
40 C
V
DDEXT
= 3.3V @ +25 C
V
DDEXT
= 2.5V @ +85 C
V
DDEXT
= 2.5V @ +85 C
V
DDEXT
= 3.3V @ +25 C
V
DDEXT
= 3.6V @
40 C
80
80
1.5
2.0
2.5
3.0
3.5
4.0
Figure 14. Typical Output Driver Characteristics
FREQUENCY DEPENDENCY FOR TIMING
SPECIFICATIONS
t
CK
is defined as 0.5 t
CKI
. The ADSP-2186M uses an input clock
with a frequency equal to half the instruction rate. For example,
a 37.50 MHz input clock (which is equivalent to 26.6 ns) yields
a 13.3 ns processor cycle (equivalent to 75 MHz). t
CK
values
within the range of 0.5 t
CKI
period should be substituted for all
relevant timing parameters to obtain the specification value.
Example: t
CKH
= 0.5 t
CK
– 2 ns = 0.5 (15 ns) – 2 ns = 5.5 ns
ENVIRONMENTAL CONDITIONS
1
Rating
Description
Symbol
θ
CA
LQFP
48
°
C/W
Mini-BGA
63.3
°
C/W
Thermal Resistance
(Case-to-Ambient)
Thermal Resistance
(Junction-to-Ambient)
Thermal Resistance
(Junction-to-Case)
θ
JA
50
°
C/W
70.7
°
C/W
θ
JC
2
°
C/W
7.4
°
C/W
NOTE
1
Where the Ambient Temperature Rating (T
AMB
) is:
T
AMB
= T
– (PD
×
θ
)
T
= Case Temperature in
°
C
PD = Power Dissipation in W
POWER DISSIPATION
To 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.
Example:
In an 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.
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