TDA7703 Datasheet, PDF (20/32 Pages) STMicroelectronics – Automatic self alignment for image rejection

Electrical specifications
3.5.2
AM MW overall system performance
Antenna level equivalence: 0 dBµV = 1 µV_rms.
Figure 7. AM MW input set up
50Ω A
15pF _30Ω
V_{rf + 6dB}
V_rf
50Ω
68pF
TDA7703
PCB
UNDER
TEST
Level referred to SG output before antenna dummy (V_rf, node 'A'); capacitive dummy
15pF+68pF, FM input not connected. F_rf = 999 kHz (1000 kHz for US), V_rf =74 dBµV,
mod = 30%, f_audio =400 Hz, unless otherwise specified.
Table 14. AM MW overall system performance
Parameter
Test condition
Min
Typ Max Units
Tuning range MW Eu/Jp
Tuning step MW Eu/Jp
Tuning range MW US
Tuning step MW US
Sensitivity
Ultimate S/N
AGC F.O.M.
Distortion
Adjacent channel selectivity
Alternate channel selectivity
Image rejection
Logarithmic field strength
indicator
(can be modified by the user) 531
(can be modified by the user)
(can be modified by the user) 530
(can be modified by the user)
S/N = 20 dB
@ 80 dBµV
63
Ref.=74 dBµV
50
-10dB drop point
m = 80 %
ΔF=9 kHz, V_audio = -10 dBr
(relative to ΔF = 0 kHz),
m=30%, 1 kHz
ΔF=18 kHz, V_audio = -10 dBr
(relative to ΔF = 0 kHz),
m=30%, 1kHz
@60 dBµV
read “AM_Smeter_log”
0.50
(equiv.
to 57
dBµV)
9
10
29
66
62
0.1
97
97
80
0.47
1629
1710
32
kHz
kHz
kHz
kHz
dBµV
dB
65
dB
%
dB
dB
dB
0.43
(equiv.
-
to 63
dBµV)
20/32
Rev 1