TDA7338 Datasheet, PDF (8/11 Pages) STMicroelectronics – STEREO DECODER

TDA7338
Figure 5: Behaviour of the Field Strength Controlled Threshold Adiustment
VPEAK
MONO
STEREO
≈3V
TRIG. THRESHOLD
2.2V
NOISE
noisy signal
Figure 6: Application Diagram
ATC_SB OFF
(PROG=V_S)
D95AU370
good signal
0.9V
E’
SIGNAL
STRENGTH
VR
PILOT_IND
MONO
68K 1)
15
47K
47K 1)
16
47K
17
18
19
100K
68K
470nF
33K
10K
MPX
20
4)
680pF
7
VCO_OFF
(FM ENABLE)
100K
100K
12
330pF
456KHz
1) has to be adapted to the signal strength
2) for deemphasis = 50µs
3) not absolutely necessary
4) roll off: to be adjusted to the tuner part
TDA7338
4
5
10µF
V_S 9V
14
13
12
11
6
9
10
3
100nF
1nF 2)
1nF 2)
47K
47K
47nF
IN R
56pF 3)
OUT
LEVEL
(SIGNAL STRENGTH)
IN L
56pF 3)
OUT
10K
10K
MUTE
D95AU371A
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