ADSST-21065LKCA-240 データシートの表示（PDF） - Analog Devices

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ADSST-21065LKCA-240

High End, Multichannel, 32-Bit Floating-Point Audio Processor

Analog Devices 

SST-Melody-SHARC

POWER DISSIPATION

These specifications apply to the internal power portion of VDD only. See the Power Dissipation section for calculation 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:

Table II. Internal Current Measurements

Operation

Instruction Type

Instruction Fetch

Core Memory Access

Internal Memory DMA

Peak Activity (IDDINPEAK)

Multifunction

Cache

2 per Cycle (DM and PM)

1 per Cycle

High Activity (IDDINHIGH)

Multifunction

Internal Memory

1 per Cycle (DM)

1 per 2 Cycles

Low Activity (IDDINLOW)

Single Function

Internal Memory

None

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 × I DDINPEAK + %HIGH × I DDINHIGH + %LOW × I DDINLOW + %IDLE16 × I DDIDLE16 = Power Consumption

Table III. Internal Current Measurement Scenarios

Parameter

Test Conditions

Max Unit

IDDINPEAK

IDDINHIGH

IDDINLOW

IDDIDLE

IDDIDLE16

Supply Current (Internal)1 tCK = 33 ns, VDD = max 470 mA

tCK = 30 ns, VDD = max 510 mA

Supply Current (Internal)2 tCK = 33 ns, VDD = max 275 mA

tCK = 30 ns, VDD = max 300 mA

Supply Current (Internal)3 tCK = 33 ns, VDD = max 240 mA

tCK = 30 ns, VDD = max 260 mA

Supply Current (IDLE)4

tCK = 33 ns, VDD = max 150 mA

tCK = 30 ns, VDD = max 155 mA

Supply Current (IDLE16)5 VDD = max

50 mA

NOTES

1The test program used to measure IDDINPEAK represents worst case processor operation and is not sustainable under normal application condi-

tions. 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 SST-Melody-SHARC state during execution of IDLE instruction.

5IDLE16 denotes SST-Melody-SHARC state during execution of IDLE16 instruction.

REV. 0

–15–

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