TDA7705 Electrical specifications
Doc ID 15938 Rev 9 25/42
3.5.2 AM MW overall system performance
Antenna level equivalence: 0 dBµV = 1 µV
rms
.
Figure 11. 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.
Image rejection - - 80 - dB
Logarithmic field strength
indicator
@40 dBµV
read “FM_Smeter_log”
-0.33
(equiv.
to 37
dBµV)
-0.3
-0.27
(equiv.
to 43
dBµV)
--
1. Signal levels referred to combiner output.
Table 17. FM overall system performance (continued)
Parameter Test condition Min Typ Max Units
Table 18. 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 - 27 30 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
F=9 kHz, SINAD = 26 dB
undesired. m=30%, 1 kHz
-42-dB
Alternate channel selectivity
F=18 kHz, SINAD=26 dB
undesired. m=30%, 1kHz
-50-dB
PCB
UNDER
TEST
30Ω
V
rf
+ 6dB
V
rf
50Ω
50Ω
15pF
68pF
A
