ADSP-21061/ADSP-21061L
POWER DISSIPATION ADSP-21061 (5 V)
These specifications apply to the internal power portion of VDD only. See the Power Dissipation section of this data sheet for calcula-
tion of external supply current and total supply current. For a complete discussion of the code used to measure power dissipation, see
the technical note “SHARC Power Dissipation Measurements.”
Specifications are based on the following operating scenarios:
Operation
Peak Activity (IDDINPEAK
Multifunction
)
High Activity (IDDINHIGH
Multifunction
)
Low Activity (IDDINLOW
Single Function
Internal Memory
None
)
Instruction Type
Instruction Fetch
Core Memory Access
Internal Memory DMA
Cache
Internal Memory
1 per Cycle (DM)
1 per 2 Cycles
2 per Cycle (DM and PM)
1 per Cycle
1 per 2 Cycles
To estimate power consumption for a specific application, use the following equation where % is the amount of time your program
spends in that state:
%PEAK × IDDINPEAK + %HIGH × IDDINHIGH + %LOW × IDDINLOW + %IDLE × IDDIDLE + %IDLE16 × IDDIDLE16 = power consumption
Parameter
Test Conditions
Max
Unit
IDDINPEAK
Supply Current (Internal)1
Supply Current (Internal)2
Supply Current (Internal)3
tCK = 30 ns, VDD = max
595
680
850
460
540
670
270
320
390
200
55
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
t
CK = 25 ns, VDD = max
tCK = 20 ns, VDD = max
tCK = 30 ns, VDD = max
IDDINHIGH
t
CK = 25 ns, VDD = max
tCK = 20 ns, VDD = max
tCK = 30 ns, VDD = max
IDDINLOW
t
CK = 25 ns, VDD = max
tCK = 20 ns, VDD = max
VDD = max
VDD = max
IDDIDLE
IDDIDLE16
Supply Current (Idle)4
Supply Current (Idle16)5
NOTES
1The test program used to measure IDDINPEAK represents worst case processor operation and is not sustainable under normal application conditions. Actual internal
power measurements made using typical applications are less than specified.
2IDDINHIGH is a composite average based on a range of high activity code.
3IDDINLOW is a composite average based on a range of low activity code.
4Idle denotes ADSP-21061 state during execution of IDLE instruction.
5Idle16 denotes ADSP-21061 state during execution of IDLE16 instruction.
REV. B
–15–
ADI [ ADI ]
