Philips TDA1576T - Manual (Page 3)

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
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
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 k
Ω
25
k Ω
25
k Ω
1 nF 0.47
µ
F
1 mA
TDA1576T