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ADSP-21469BBC-3

SHARC Processor

Analog Devices 

ADSP-21467/ADSP-21469

Total Power Dissipation

The information in this section should be augmented with

Estimating Power for ADSP-214xx SHARC Processors (EE-348).

Total power dissipation has two components:

1. Internal power consumption is additionally comprised of

two components:

• Static current due to leakage. Table 13 shows the static

current consumption (IDD_INT_STATIC) as a function of

junction temperature (TJ) and core voltage (VDD_INT).

• Dynamic current (IDD_INT_DYNAMIC), due to transistor

switching characteristics and activity level of the pro-

cessor. The activity level is reflected by the Activity

Scaling Factor (ASF), which represents the activity

level of the application code running on the processor

core and having various levels of peripheral and exter-

nal port activity (Table 12). Dynamic current

consumption is calculated by selecting the ASF that

corresponds most closely with the user application

and then multiplying that with the dynamic current

consumption (Table 14).

2. External power consumption is due to the switching activ-

ity of the external pins.

Table 12. Activity Scaling Factors (ASF)1

Activity

Scaling Factor (ASF)

Idle

0.38

Low

0.58

High

1.23

Peak

1.35

Peak-typical (50:50)2

0.87

Peak-typical (60:40)

0.94

Peak-typical (70:30)

1.00

1 See Estimating Power for SHARC Processors (EE-348) for more information on

the explanation of the power vectors specific to the ASF table.

2 Ratio of continuous instruction loop (core) to DDR2 control code; reads:writes.

Table 13. Static Current—IDD_INT_STATIC (mA)

TJ (°C)1

0.95 V

1.0 V

VDD_INT (V)1

1.05 V

–45

72

91

110

–35

79

99

119

–25

89

109

131

–15

101

122

145

–5

115

140

166

5

134

162

192

15

158

189

223

25

186

222

260

35

218

259

302

45

258

305

354

55

305

359

413

65

360

421

484

75

424

496

566

85

502

580

660

95

586

683

768

105

692

794

896

115

806

921

1036

125

939

1070

1198

1 Valid temperature and voltage ranges are model-specific. See Operating Conditions on Page 19.

1.10 V

140

149

163

182

206

237

273

318

367

428

497

578

674

783

912

1054

1220

1404

1.15 V

167

181

198

220

249

284

326

377

434

503

582

675

781

904

1048

1212

1394

1601

Rev. B | Page 21 of 76 | March 2013

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