AN1714 datasheet(41/46 Pages) STMICROELECTRONICS

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AN1714

Demonstration board characterization

41/46

Figure 36.

Signal/noise ratio for the 132.5 kHz channel, signal level 85 dBuV, mains

110 V~

Figure 37.

Signal/noise ratio for the 110 kHz channel, signal level 91 dBuV

3.3

Output impedance

The last characterization report concerns the output impedances of the application.

In order to not degrade the communication network it is mandatory to guarantee a minimum

value of the output impedance of each component of the system, both in the receiving and

transmitting condition. In this last case impedance constraints concern only the frequency

ranges of the other communication bands.

Ch 132.5KHz, BAUD 2400, DEV 0.5

S = 85 dBuV, BER < 10e-3 - mains 110V~

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

80 90 100 110 120 130 140 150 160 170 180 190 200

FREQ[KHz]

S/N

Fix Tone

AM 1kHz - 80%

Ch 110KHz, BAUD 2400, DEV 0.5

S = 91 dBuV, BER < 10e-3 - mains 220V~

-45

-40

-35

-30

-25

-20

-15

-10

-5

100 110 120 130 140 150 160 170 180

FREQ[KHz]

S/N

Fix Tone

AM 1kHz - 80%

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