Philips TDA1576T Manual Do Utilizador
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 k
Ω
8.3 k
Ω
560 pF
33 pF
QL = 20
fo = 10.7 MHz
fo = 10.7 MHz
33 pF
6.8 nF
audio
outputs
10
Ω
0.1
µ
F
47
µ
F
3.7 k
Ω
V2
MUTE
ATTENUATOR
QUADRATURE
DEMODULATOR
RES1
IF1
CPS
VP
VP
V1
V2
RES2
IF2
VoAF1
VAF
−
VAF
VoAF2
n.c.
10
9
8
Vi(det)
12
n.c.
11
Vo(det)
13
Vref
14
VF0
16
ViIF
17
VFB2
VFB1
0.1
µ
F
0.1
µ
F
ViIF
RS
RS
18
GND
2 V (RMS)
20
19
VF
15
7
6
5
4
3
2
1
FMON
FM
on
on
REFERENCE
VOLTAGE
reference
voltage
detune
voltage
zero adjustment
of
field strength
indicator
field strength
LEVEL DETECTOR
4-STAGE
LIMITER/
LIMITER/
AMPLIFIER
+
4.9 V
+
8.5 V
3.6 k
Ω
25
k
Ω
25
k
Ω
1 nF
0.47
µ
F
1 mA
TDA1576T