TDA4321XS Datasheet, PDF (13/16 Pages) List of Unclassifed Manufacturers – FM-IF IC with counter output, analog STS, field strength indicator, noise detector and mute setting

FS: 04/93
SIEMENS AG
Page 13
IC-SPECIFICATION
TDA 4321 XS
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Diagrams
V_F Characteristic
D1
UF (V)
5
2.5
-80
M3
M_VFmin
-60
-40
-20
0 U_iIF (dBm)
M1
M2
M4
VF - Dynamic
M_VFmax
V_F - Dynamic :The dynamic range of VF 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 :
U_F (M4) - U_F (M2)
M_VFmax:= - 20 dBm+––––––––––––––––– × 40 dB
U_F (M2) - U_F (M1)
U_F (M1) - U_F (M3)
M_VFmin:= - 60 dBm - ––––––––––––––––– × 40 dB
U_F (M2) - U_F (M1)
VF - Dynamic = M_VFmax - M_VFmin
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HL DOK
V66047-S1665-B100-G1
5.10.98