TDA4320X Datasheet, PDF (12/16 Pages) Siemens Semiconductor Group – FM-IF with Counter Output, Field Strength Indicator, Noise Detector and MUTE Setting

Diagrams
Diagram D1
TDA 4320X
V_F Dynamics
The dynamic range of V_F voltage is determined by the test points M1 through M4 as
follows:
M1: test point (at V_iIF = – 60 dBm) supplies V_F(M1)
M2: test point (at V_iIF = – 20 dBm) supplies V_F(M2)
M3: test point (at V_iIF = – 90 dBm) supplies V_F(M3)
M4: test point (at V_iIF = + 5 dBm) supplies V_F(M4)
Hence follows:
M_{VF max} := – 20 dBm + (V_F(M4) – V_F(M2))/(V_F(M2) – V_F(M1)) × 40 dB
M_{VF min} := – 60 dBµV – (V_F(M1) – V_F(M3))/(V_F(M2) – V_F(M1)) × 40 dB
V M M = – _{F Dynamics}
VF max
VF min
Semiconductor Group
46
04.96