Electrical specifications TDA7703
20/32 Rev 1
3.5.2 AM MW overall system performance
Antenna level equivalence: 0 dBµV = 1 µV
rms
.
Figure 7. AM MW input set up
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 (can be modified by the user) 531 1629 kHz
Tuning step MW Eu/Jp (can be modified by the user) 9 kHz
Tuning range MW US (can be modified by the user) 530 1710 kHz
Tuning step MW US (can be modified by the user) 10 kHz
Sensitivity S/N = 20 dB 29 32 dBµV
Ultimate S/N @ 80 dBµV 63 66 dB
AGC F.O.M.
Ref.=74 dBµV
-10dB drop point
50 62 65 dB
Distortion m = 80 % 0.1 %
Adjacent channel selectivity
ΔF=9 kHz, V
audio
= -10 dBr
(relative to ΔF = 0 kHz),
m=30%, 1 kHz
97 dB
Alternate channel selectivity
ΔF=18 kHz, V
audio
= -10 dBr
(relative to ΔF = 0 kHz),
m=30%, 1kHz
97 dB
Image rejection 80 dB
Logarithmic field strength
indicator
@60 dBµV
read “AM_Smeter_log”
0.50
(equiv.
to 57
dBµV)
0.47
0.43
(equiv.
to 63
dBµV)
-
PCB
UNDER
TEST
30Ω
V
rf + 6dB
V
rf
50Ω
50Ω
15pF
68pF
A
