ADSP-21160M(Rev0) 데이터 시트보기 (PDF) - Analog Devices

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ADSP-21160M
(Rev.:Rev0)

SHARC® DSP Microcomputer

Analog Devices 

ADSP-21160M

Output Drive Currents

Figure 29 shows typical I–V characteristics for the output drivers of the ADSP-21160M. The curves represent the current

drive capability of the output drivers as a function of output voltage.







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Figure 29. ADSP-21160M Typical Drive Currents

Power Dissipation

Total power dissipation has two components, one due to internal circuitry and one due to the switching of external output

drivers.

Internal power dissipation is dependent on the instruction execution sequence and the data operands involved. Using the

current specifications (I , DDINPEAK I , DDINHIGH I , DDINLOW I ) DDIDLE from Electrical Characteristics on page 13 and the current-ver-

sus-operation information in Table 29, engineers can estimate the ADSP-21160M’s internal power supply (VDDINT) input

current for a specific application, according to the following formula:

% Peak × IDDINPEAK

% High × IDDINHIGH

% Low × IDDINLOW

+-----%-------I--d---l--e----×-----I--D----D----I--D----L----E-

IDDINT

The external component of total power dissipation is caused by the switching of output pins. Its magnitude depends on:

• the number of output pins that switch during each cycle (O)

• the maximum frequency at which they can switch (f)

• their load capacitance (C)

• their voltage swing (VDD)

and is calculated by:

PEXT = O × C × VDD2 × f

–42–

REV. 0

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