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1998 Nov 18 3
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576T
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BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MEH139
DETUNE
DETECTOR
0.5
mA
3.7 kΩ
8.3 kΩ
560 pF
33 pF
Q
L
= 20
f
o
= 10.7 MHz
33 pF
6.8 nF
audio
outputs
10 Ω
0.1 µF 47 µF
3.7 kΩ
V2
MUTE
ATTENUATOR
QUADRATURE
DEMODULATOR
RES1IF1C
PS
V
P
V
P
V1 V2
RES2 IF2 V
oAF1
V
AF
−V
AF
V
oAF2
n.c.
1098
V
i(det)
12
n.c.
11
V
o(det)
13
V
ref
14
V
F0
16
V
iIF
17
V
FB2
V
FB1
0.1 µF
0.1 µF
V
iIF
R
S
R
S
18
GND
2 V (RMS)
20 19
V
F
15
7654321
FMON
FM
on
REFERENCE
VOLTAGE
reference
voltage
detune
voltage
zero adjustment
of
field strength
indicator
field strength
LEVEL DETECTOR
4-STAGE
LIMITER/
AMPLIFIER
+4.9 V
+8.5 V
3.6 kΩ
25
kΩ
25
kΩ
1 nF 0.47 µF
1 mA
TDA1576T