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ADSP-2161 Datasheet

  • ADSP-2161

  • Analog Devices [DSP Microcomputers with ROM]

  • 665.94KB

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ADSP-216x
ADSP-2162/ADSP-2164/ADSP-2166
POWER DISSIPATION EXAMPLE
CAPACITIVE LOADING
To determine total power dissipation in a specific application,
the following equation should be applied for each output:
C
脳
V
DD
2
脳
f
C
= load capacitance,
f
= output switching frequency.
Example:
Figures 16 and 17 show capacitive loading characteristics for
the ADSP-2162 and ADSP-2164.
35
30
RISE TIME (0.4V 鈥?2.0V) 鈥?ns
25
20
V
DD
= 3.0V
15
10
5
0
In an ADSP-2162 application where external data memory is
used and no other outputs are active, power dissipation is calcu-
lated as follows:
Assumptions:
鈥?External data memory is accessed every cycle with 50% of the
address pins switching.
鈥?External data memory writes occur every other cycle with
50% of the data pins switching.
鈥?Each address and data pin has a 10 pF total load at the pin.
鈥?The application operates at V
DD
= 3.3 V and t
CK
= 100 ns.
Total Power Dissipation
=
P
INT
+
(C
脳
V
DD
脳
f)
2
0
25
50
75
100
C
L
鈥?pF
125
150
175
Figure 16. Typical Output Rise Time vs. Load Capaci-
tance, C
L
(at Maximum Ambient Operating Temperature)
10
8
P
INT
= internal power dissipation (from Figure 15).
(C
脳
V
DD2
脳
f)
is calculated for each output:
# of
Pins
8
9
1
1
RISE TIME (0.4V 鈥?2.0V) 鈥?ns
Output
Address,
DMS
Data,
WR
RD
CLKOUT
C
脳
10 pF
脳
10 pF
脳
10 pF
脳
10 pF
V
DD2
脳
3.3
2
V
脳
3.3
2
V
脳
3.3
2
V
脳
3.3
2
V
6
4
V
DD
= 3.0V
2
NOMINAL
鈥?
鈥?
f
脳
10 MHz
脳
5 MHz
脳
5 MHz
脳
10 MHz
=
=
=
=
8.71 mW
4.90 mW
0.55 mW
1.09 mW
Total power dissipation for this example = P
INT
ENVIRONMENTAL CONDITIONS
15.25 mW
+ 15.25 mW.
0
25
50
75
100
C
L
鈥?pF
125
150
175
Ambient Temperature Rating:
T
AMB
= T
CASE
鈥?(PD
脳 胃
CA
)
T
CASE
= Case Temperature in
掳C
PD = Power Dissipation in W
胃
CA
= Thermal Resistance (Case-to-Ambient)
胃
JA
= Thermal Resistance (Junction-to-Ambient)
胃
JC
= Thermal Resistance (Junction-to-Case)
Package
MQFP
JA
JC
CA
Figure 17. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L
(at Maximum Ambient Operating
Temperature)
60掳C/W
18掳C/W
42掳C/W
REV. 0
鈥?9鈥?/div>

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