參數(shù)資料
型號(hào)： ADSP-2187LKST-160
廠商： ANALOG DEVICES INC
元件分類： 數(shù)字信號(hào)處理
英文描述： DSP Microcomputer
中文描述： 24-BIT, 26.3 MHz, OTHER DSP, PQFP100
封裝： MS-026BED, LQFP-100
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 223K
代理商： ADSP-2187LKST-160
ADSP-2187L
–17–
REV. 0
Total Power Dissipation
=
P
INT
+
(C
×
V
DD2
×
f
)
P
INT
= internal power dissipation from Power vs. Frequency
graph, see Figure 14.
(
C
×
V
DD2
×
f
) is calculated for each output:
# of
Pins
×
C
×
V
DD2
×
f
Address,
DMS
Data Output,
WR
RD
CLKOUT
8
9
1
1
×
10 pF
×
10 pF
×
10 pF
×
10 pF
×
3.3
2
V
×
33.3 MHz
×
3.3
2
V
×
16.67 MHz =
×
3.3
2
V
×
16.67 MHz =
×
3.3
2
V
×
33.3 MHz
=
29.0 mW
16.3 mW
1.8 mW
3.6 mW
50.7 mW
=
Total power dissipation for this example is P
INT
+ 50.7 mW.
FREQUENCY – MHz
250
150
33.3
52
200
50
0
2187L POWER, INTERNAL
1, 3, 4
V
DD
= 3.6V
V
DD
= 3.3V
V
DD
= 3.0V
216mW
168.3mW
132mW
144mW
112.2mW
87mW
P
100
FREQUENCY – MHz
POWER, IDLE nMODES
3
25
10
33.33
52
45
30
20
15
40
35
5
0
POWER, IDLE
1, 2, 3
V
DD
= 3.6V
V
DD
= 3.3V
V
DD
= 3.0V
35mW
32mW
30mW
25mW
23mW
21mW
P
FREQUENCY – MHz
45
20
5
33.33
40
25
15
10
35
30
8
52
IDLE
IDLE (16)
IDLE (128)
32mW
13mW
12mW
23mW
10mW
9mW
P
VALID FOR ALL TEMPERATURE GRADES.
1
POWER REFLECTS DEVICE OPERATING WITH NO OUTPUT LOADS.
2
IDLE REFERS TO ADSP-2187L STATE OF OPERATION DURING EXECUTION OF IDLE
INSTRUCTION. DEASSERTED PINS ARE DRIVEN TO EITHER V
DD
OR GND.
3
TYPICAL POWER DISSIPATION AT 3.3V V
DD
AND 25
8
C EXCEPT WHERE SPECIFIED.
4
I
MEASUREMENT TAKEN WITH ALL INSTRUCTIONS EXECUTING FROM INTERNAL
MEMORY. 50% OF THE INSTRUCTIONS ARE MULTIFUNCTION (TYPES 1, 4, 5, 12, 13, 14),
30% ARE TYPE 2 AND TYPE 6, AND 20% ARE IDLE INSTRUCTIONS.
Figure 14. Power vs. Frequency
OUTPUT DRIVE CURRENTS
Figure 12 shows typical I-V characteristics for the output drivers
of the ADSP-2187L. The curves represent the current drive
capability of the output drivers as a function of output voltage.
SOURCE VOLTAGE – Volts
80
–60
0
4
S
0.5
1
1.5
2
2.5
3.5
–20
–40
40
20
60
0
–80
3.0V, +85
8
C
3.3V, +25
8
C
3.6V, –40
8
C
3.0V, +85
8
C
3.3V, +25
8
C
3.6V, –40
8
C
3
Figure 12. Typical Drive Currents
Figure 13 shows the typical power-down supply current.
NOTES:
1. REFLECTS ADSP-2187L OPERATION IN LOWEST POWER MODE.
(SEE "SYSTEM INTERFACE" CHAPTER OF THE ADSP-2100 FAMILY
USER'S MANUALFOR DETAILS.)
2. CURRENT REFLECTS DEVICE OPERATING WITH NO INPUT LOADS.
Figure 13. Power-Down Supply Current (Typical)
V
DD
= 3.6V
V
DD
= 3.3V
V
DD
= 3.0V
TEMPERATURE –
8
C
C
m
A
1000
100
00
85
25
55
10
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.
Each address and data pin has a 10 pF total load at the pin.
The application operates at V
DD
= 3.3 V and t
CK
= 34.7 ns.
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