TDA1574 Просмотр технического описания (PDF) - Gunter Seniconductor GmbH.
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TDA1574 Datasheet PDF : 12 Pages
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+VCC
AGC
HF-
PRE-AMP.
stand by
search tuning stop
0
1
mode select
1
18
2
17
3
16
4
15
TDA 1574
5
14
6
13
7
12
8
11
9
10
10
9
11
8
12
7
13
6
TDA 1596
14
5
15
4
16
3
17
2
18
1
tuning
to counter
FM - front - end based on TDA1574 and TDA 1596
narrow band AGC
level
LF-MPX
indicator signal
Application Hints
Plns 11 and 12 should be blocked to ground by in each case 10 nF in order to avoid unwanted signal injection.
The IF gain can be adjusted within the range between 10 dB and 82 dB by means of a dc voltage between
0.6 and 1.6 V at pin 3.
Start of the prestage AGC depends on the RF input voltage at pin 3 and on the dc voltage at pin 12. By
appropriate selection of the effective share of the indication voltage at pin 12 the ratio of noise and large signal
charasteristic can be optimized.
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