TDA1576 Philips Semiconductors, TDA1576 Datasheet - Page 3

• Manufacturer Part Number: TDA1576
• Description: FM/IF amplifier/demodulator circuit
• Manufacturer: Philips Semiconductors

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(1) For 50 s de-emphasis: C
(2) L = 0.38 H; Q
V iIF
V S
R S
0.1 F
R S
(AM)
0.1
0.1
F
F
o
indicator
strength
V FB1
V FB2 16
= 70; Q
V ilF
field
A
1 mA
17
15
3.6 k
L
= 20; adjusted to minimum 2
field strength
8 9
level output
= 6.8 nF; for stereo operation C
for
DETECTOR
INDICATOR
AMPLIFIER
4-STAGE
LIMITER/
13
DRIVER
V F
LEVEL
25 k
25 k
nF
1
zero adjustment
of field strength
14
V F0
20 k
indicator
(25 k
STANDBY
nd
MUTING
SWITCH
harmonic distortion (d
5
FMON
FM
on
8 9
pF
33
IF1
Fig.1 Block diagram and test circuit.
= 56 pF.
TDA1576
250
3
(6 V BE )
(<23 V)
560
pF
4 V
33
pF
IF2
7
2
INTERNAL
); at V
reference
6
POWER
SUPPLY
RES2
DEMODULATOR
voltage
15 k
QUADRATURE
L
(2)
12
(185 V T )
V ref
i
= 1 mV; coil: 6 turns CuL (0.25 mm) on coil former KAN (C).
5.3 V
15 k
750
10 k
1.7 V
220 k
4
RES1
voltage
detune
0.1 F
5.5
3.7
k
k
11
V o(det)
DETECTOR
DETUNE
3.7
k
I 11 =
0.5 mA
0.47 F
1
V P
(15 V)
10
8.3 k
G
C PS
2
47 F
18
GND
10
8
9
MGE456
V oAF1
V oAF2
V i(det)
voltage
AFC
Z 8-10
(240
k )
Z 9-10
(180
k )
(3.3 k
C 8-9
(1)
V oAF