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CMX631A

Low Voltage SPM Detector

MX-COM Inc  

Low Voltage SPM Detector

9

CMX631A PRELIMINARY INFORMATION

5.1.2 Aliasing

Due to the sampling nature of switched-capacitor filters used in the CMX631A, high frequency noise or

unwanted signals can alias into the passband, disrupting detection. External components must be chosen

carefully to avoid alias effects.

Possible Alias Frequencies:

12kHz Mode = 52kHz

16kHz Mode = 69kHz

If other filtering in the system has not attenuated these alias frequencies, capacitors should be employed

across resistors R1 and R4 to provide anti-alias filtering.

The low-pass cutoff frequency should be chosen to be approximately 20kHz to 25kHz for a 12kHz system, or

25kHz to 30kHz for a 16kHz system.

1

i.e. C =

2 × × f0 × (R1or R4)

When anti-alias capacitors are used, an allowance must be made for reduced gain at the SPM frequency

(12kHz or 16kHz).

6 Performance Specification

6.1 Electrical Specifications

6.1.1 Absolute Maximum Ratings

Exceeding the maximum rating can result in device damage.

Parameter

Supply Voltage (VDD-VSS)

Voltage on any pin to VSS

Current

VDD

VSS

Any other pin

D4 / P3 Packages

Total allowable device dissipation at TAMB 25°C

Derating above TAMB 25°C

Operating Temperature

Storage Temperature

D5 Package

Total allowable device dissipation at TAMB 25°C

Derating above TAMB 25°C

Operating Temperature

Storage Temperature

Min.

-0.3

-0.3

Typ.

-30

-30

-20

-40

-40

-40

-40

Max.

7.0

(VDD + 0.3)

30

30

20

800

13

85

85

550

9

85

85

Unit

V

V

mA

mA

mA

mW

mW/°C above TAMB 25°C

°C

°C

mW

mW/°C above TAMB 25°C

°C

°C

© 1999 MX•COM Inc.

www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054

Doc. # 20480177.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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