ADSP-2141L View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'ADSP-2141L' PDF : 39 Pages View PDF
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 VDD = 3.3 V and tCK = 25 ns.
Total Power Dissipation = PINT + (C × VDD2 × f )
PINT = internal power dissipation from Power vs. Frequency
graphs (Figures 30 and 31).
(C × VDD2 × f ) is calculated for each output:
Address, DMS
Data Output, WR
RD
CLKOUT
# of
Pins × C
8 × 10 pF
9 × 10 pF
1 × 10 pF
1 × 10 pF
× VDD2
× 3.32 V
× 3.32 V
× 3.32 V
× 3.32 V
×f
× 40 MHz
× 20 MHz
× 40 MHz
× 20 MHz
= 34.8 mW
= 19.6 mW
= 2.2 mW
= 4.4 mW
61.0 mW
Total power dissipation for this example is PINT +61 mW.
ADSP-2141L
POWER, INTERNAL
940
840
740
706mW
640
554mW
540
440
431mW
VDD = 3.6V
VDD = 3.3V
VDD = 3.0V
823mW
649mW
509mW
340
32 33 34 35 36 37 38 39 40 41 42
FREQUENCY – MHz
Figure 30. Power vs. Frequency
POWER, IDLE
80
75
70
68mW
65
VDD = 3.6V
74mW
60
55
50 51mW
VDD = 3.3V
53mW
45
41mW
VDD = 3.0V
43mW
40
32 33 34 35 36 37 38 39 40 41 42
FREQUENCY – MHz
Figure 31. Power vs. Frequency
REV. 0
–35–
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