TDA7705 Datasheet, PDF (29/42 Pages) STMicroelectronics – Single 5 V supply

TDA7705
Electrical specifications
3.5.5
WX overall system performance
Antenna level equivalence: 0 dBµV = 1 µV_rms (Antenna terminal voltage with 50 source).
Figure 14. WX input set-up
V_{rf + 6dB}
50Ω A
V_rf
50Ω
50Ω
V_{rf + 6dB}
PCB
UNDER
TEST
Input level referred to signal generator loaded with 50  (V_rf, node 'A'); no antenna dummy;
AM input not connected. F_rf =162.475 MHz, V_rf = 60 dBµV, mono modulation, f_dev = 3 kHz,
f_audio =400 Hz. De-emphasis = 75 µs. Application: WX using mixer input 2, in conjunction
with FM narrow-band. Unless otherwise specified.
Table 21. WX overall system performance
Parameter
Test condition
Min
Typ Max
Sensitivity
S/N = 26 dB
-
-7
-
Ultimate S/N
Distortion
@ 60 dBµV
Deviation= 4.5 kHz
-
81
-
-
0.8
-
Max deviation
THD = 3 %
- > 5 kHz -
F= 25 kHz, SINAD = 30 dB
Adjacent channel Selectivity ^{desired 40 dBµV,}
dev =2.0 kHz, 400 Hz
-
70
-
undesired. dev= 3 kHz, 1 kHz
F=50kHz, SINAD=30dB
Alternate Channel Selectivity ^{desired 40 dBµV,}
dev=2.0kHz, 400Hz
-
70
-
undesired. dev=2.0kHz, 1kHz
Units
dBµV
dB
%
kHz
dB
dB
Doc ID 15938 Rev 9
29/42