MPXM2102AS datasheet(123/670 Pages) MOTOROLA

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AN1632

2–87

Motorola Sensor Device Data

www.motorola.com/semiconductors

Fundamental

1st

2nd

3rd

4th

5th

SAMPLING FREQUENCY AND HARMONICS

0.5

1.5

2.5

3.5

Figure 3. Worst Case Aliasing Gain Model Derived from Characterization Data

Harmonic

Freq. (kHz)

HRC1

HRC2

Aliasing Gain

Fundamental

0.0101

*2.1120

0.4242

1st

130

*0.0016

*1.4881

0.3674

2nd

195

0.0237

*4.1572

2.7116

3rd

260

*0.0060

*0.2919

0.6007

4th

325

*0.0098

3.7439

3.2017

5th

390

*0.0164

4.3054

0.7361

Figure 4. Values for Worst Case Aliasing Gain Model

The aliasing gain model can be used to estimate the amount

of noise that can be expected on the output due to noise in the

switching power supply. As an example, consider a switching

power supply operating at 65.05 kHz, with peak–to–peak

noise levels of 10, 6, 3.3, 2.5, 2, and 1.4 mV for the fundamen-

tal and the first five harmonics, respectively. Assume the worst

case scenario, an almost perfect match of power supply fun-

damental frequency with the fundamental of the ASIC and all

noise signals in phase. The power supply noise that would be

seen at the output due to each harmonic would be calculated

as follows:

Harmonic

Aliasing Gain

P.S. Noise

Output Noise

Fundamental

0.4242

10.00 mV

4.24 mV

1st

0.3674

6.00 mV

2.20 mV

2nd

2.7116

3.33 mV

9.04 mV

3rd

0.6007

2.50 mV

1.50 mV

4th

3.2017

2.00 mV

6.40 mV

5th

0.7361

1.40 mV

1.03 mV

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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