CMX631A 查看數據表（PDF） - MX-COM Inc

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CMX631A

Low Voltage SPM Detector

MX-COM Inc  

Low Voltage SPM Detector

7

CMX631A PRELIMINARY INFORMATION

2. Mark the intersection of the upper horizontal line and the upper sloping line; drop a vertical line from this

point to the X-axis [Amplifier Gain (dB)]. The point where the vertical line meets the X-axis indicates the

minimum Input Amp gain required for reliable decoding of valid signals.

3. Mark the intersection of the lower horizontal line and the lower sloping line; drop a vertical line from this

point to the X-axis. The point where the vertical line meets the X-axis will indicate the maximum allowable

Input Amp gain. Input signals at or below the ‘Must-Not’ decode level will not be detected as long as the

amplifier gain is no higher than this level.

-1 0

-2 0

MUST DECODE LEVEL

-3 0

MUST NOT DECODE LEVEL

-4 0

-5 0

-3 0

MINIMUM AMPLIFIER GAIN

MAXIMUM AMPLIFIER GAIN

-2 0

-1 0

0

10

20

AMPLIFIER GAIN (dB) VDD = 3.0V (±0.1) TAMB = -40°C to 85°C

Figure 4: Input Gain Calculation Graph for VDD = 3.0V

-10

-15

-20

MUST DECODE LEVEL

-25

MUST NOT DECODE LEVEL

-30

-35

-40

-45

MINIMUM AMPLIFIER GAIN

MAXIMUM AMPLIFIER GAIN

-50

-25

-20

-15

-10

-5

0

5

10

15

20

AMPLIFIER GAIN (dB) VDD = 5.0 (±0.5) TEMP = -40°C to 85°C

Figure 5: Input Gain Calculation Graph for VDD = 5.0V

30

25

© 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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