TDA7705_10 Datasheet, PDF (25/42 Pages) STMicroelectronics – Highly integrated tuner for AM/FM car radio

TDA7705
Electrical specifications
3.5.2
Table 17. FM overall system performance (continued)
Parameter
Test condition
Min
Typ Max Units
Image rejection
Logarithmic field strength
indicator
-
@40 dBµV
read “FM_Smeter_log”
-
80
-
dB
-0.33
-0.27
(equiv. _-0.3 (equiv.
--
to 37
to 43
dBµV)
dBµV)
1. Signal levels referred to combiner output.
AM MW overall system performance
Antenna level equivalence: 0 dBµV = 1 µV_rms.
Figure 11. AM MW input set up
V_{rf + 6dB}
50Ω A
V_rf
15pF _30Ω
50Ω
68pF
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 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
Tuning step MW Eu/Jp
(can be modified by the user) -
Tuning range MW US
(can be modified by the user) 530
Tuning step MW US
(can be modified by the user) -
Sensitivity
S/N = 20 dB
-
Ultimate S/N
@ 80 dBµV
63
AGC F.O.M.
Ref.=74 dBµV
50
-10dB drop point
Distortion
m = 80 %
-
Adjacent channel selectivity
ΔF=9 kHz, SINAD = 26 dB
undesired. m=30%, 1 kHz
-
Alternate channel selectivity
ΔF=18 kHz, SINAD=26 dB
undesired. m=30%, 1kHz
-
-
1629 kHz
9
-
kHz
-
1710 kHz
10
-
kHz
27
30 dBµV
66
-
dB
62
65
dB
0.1
-
%
42
-
dB
50
-
dB
Doc ID 15938 Rev 8
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