Component selection guidelines

AN3352

20/26

Doc ID 018526 Rev 3

2.9

Undervoltage protection diode (D2)

During a short-circuit event on the LNB output, negative voltage spikes may occur on the

voltage is used between this pin and GND (see D2 in Figure 6). It is recommended to place

Figure 13.

Tone amplitude vs. R9 value

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0.85

0.9

0.51

1.52

2.5

3

3.5

4

4.5

R9 value (kohm)