DSPD56367AG150 Freescale Semiconductor, DSPD56367AG150 Datasheet - Page 90

• Manufacturer Part Number: DSPD56367AG150
• Description: DSP Fixed-Point 24-Bit 150MHz 150MIPS 144-Pin LQFP Tray
• Manufacturer: Freescale Semiconductor

Specifications of DSPD56367AG150

• Package: 144LQFP
• Numeric And Arithmetic Format: Fixed-Point
• Maximum Speed: 150 MHz
• Ram Size: 69 KB
• Device Million Instructions Per Second: 150 MIPS

PLL Performance Issues
One way to evaluate power consumption is to use a current per MIPS measurement methodology to
minimize specific board effects (i.e., to compensate for measured board current not caused by the DSP).
A benchmark power consumption test algorithm is listed in
Benchmark". Use the test algorithm, specific test current measurements, and the following equation to
derive the current per MIPS value.
where:
5.4
The following explanations should be considered as general observations on expected PLL behavior.
There is no testing that verifies these exact numbers. These observations were measured on a limited
number of parts and were not verified over the entire temperature and voltage ranges.
5.4.1
The allowed jitter on the frequency of EXTAL is 0.5%. If the rate of change of the frequency of EXTAL
is slow (i.e., it does not jump between the minimum and maximum values in one cycle) or the frequency
of the jitter is fast (i.e., it does not stay at an extreme value for a long time), then the allowed jitter can be
2%. The phase and frequency jitter performance results are only valid if the input jitter is less than the
prescribed values.
5-4
I
I
F2
F1
typF2
typF1
PLL Performance Issues
Input (EXTAL) Jitter Requirements
= current at F2
= current at F1
= high frequency (any specified operating frequency)
= low frequency (any specified operating frequency lower than F2)
F1 should be significantly less than F2. For example, F2 could be 66 MHz
and F1 could be 33 MHz. The degree of difference between F1 and F2
determines the amount of precision with which the current rating can be
determined for an application.
I MIPS
⁄
=
DSP56367 Technical Data, Rev. 2.1
I MHz
⁄
=
NOTE
(
I
typF2
–
Appendix A, "Power Consumption
I
typF1
)
⁄
(
F2 F1
–
)
Freescale Semiconductor