ADSP-21469KBCZ-4(Rev0) Просмотр технического описания (PDF) - Analog Devices

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ADSP-21469KBCZ-4
(Rev.:Rev0)

SHARC Processor

Analog Devices 

Total Power Dissipation

Total power dissipation has two components:

1. Internal power consumption

2. External power consumption

Internal power consumption also comprises two components:

1. Static, due to leakage current. Table 12 shows the static cur-

rent consumption (IDD-STATIC) as a function of junction

temperature (TJ) and core voltage (VDD_INT).

2. Dynamic (IDD-DYNAMC), due to transistor switching char-

acteristics and activity level of the processor. The activity

level is reflected by the Activity Scaling Factor (ASF), which

represents application code running on the processor core

and having various levels of peripheral and external port

activity (Table 11). Dynamic current consumption is calcu-

lated by scaling the specific application by the ASF and

using baseline dynamic current consumption as a

reference.

External power consumption is due to the switching activity of

the external pins.

ADSP-21469

The ASF is combined with the CCLK frequency and VDD_INT

dependent data in Table 13 to calculate this part. The second

part is due to transistor switching in the peripheral clock

(PCLK) domain, which is included in the IDD_INT specification

equation.

Table 11. 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 12. IDD-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 17.

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. 0 | Page 19 of 72 | June 2010

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