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INTEGRATED CIRCUITS
DATA SHEET
TDA1576
FM/IF amplifier/demodulator circuit
Product specification
Supersedes data of March 1985
File under Integrated Circuits, IC01
1998 Nov 18
Philips Semiconductors
Product specification
FM/IF amplifier/demodulator circuit
TDA1576
FEATURES
GENERAL DESCRIPTION
·
Symmetrical limiting IF amplifier
The TDA1576 is a monolithic integrated FM/IF amplifier
circuit for use in mono and stereo FM-receivers of car
radios or home sets.
·
Symmetrical quadrature demodulator
·
Internal muting circuit
·
Symmetrical AFC output
·
Field strength indication output
·
Detune detector
·
Reference voltage output
·
Electronic smoothing of the supply voltage
·
Standby on/off switching circuit.
QUICK REFERENCE DATA
f
o
= 10.7 MHz;
D
f=
±
22.5 kHz; f
m
= 400 Hz; Q
L
= 20; 50
m
s de-emphasis.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P
supply voltage (pin 1)
7.5
-
20
V
I
P
supply current
V
P
= 8.5 V
-
16
-
mA
V
P
=15V
-
18
-
mA
V
iIF(rms)
input sensitivity (RMS value)
-
3 dB before limiting
-
22
-
m
V
S
+
N
=26dB
-
8
-
m
V
S
+
N
=46dB
-
35
-
m
V
V
oAF(rms)
AF output voltage (RMS value)
V
P
= 8.5 V
-
67
-
mV
V
P
=15V
-
135
-
mV
THD
total harmonic distortion
single tuned circuit
-
0.1
-
%
two tuned circuits
-
0.02
-
%
S
+
N
signal plus noise-to-noise ratio
V
iIF
> 1 mV (RMS);
V
P
= 8.5 V
-
76
-
dB
V
iIF
> 1 mV (RMS);
V
P
=15V
-
80
-
dB
a
AM
AM suppression
-
50
-
dB
D
f
i
AFC offset drift
-
±
3
±
6
kHz
D
V
i
field strength indication
-
90
-
dB
I
L
permissible indicator load current
-
-
2
mA
T
amb
operating ambient temperature
-
30
-
+80
°
C
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA1576
DIP18 plastic dual in-line package; 18 leads (300 mil)
SOT102-1
1998 Nov 18
2
--------------
--------------
--------------
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+
33
pF
560
pF
L
(2)
750
W
0.1
m
F
10
W
47
m
F
33
pF
IF1
IF2
RES2
RES1
V
P
(15 V)
C
PS
V
FB1
17
25 k
W
3
76
4
1
2
15 k
W
15 k
W
0.1
m
25 k
W
8.3 k
W
R
S
F
AFC
voltage
V
i
IF
V
ilF
15
5.5
k
+
-
W
0.1
m
F
4-STAGE
LIMITER/
AMPLIFIER
250
W
QUADRATURE
DEMODULATOR
MUTING
R
S
V
FB2
16
3.7
k
3.7
k
0.1
m
W
W
(3.3 k
W)
F
8
V
oAF
V
S
V
oAF1
C
8-9
(1)
9
LEVEL
DETECTOR
TDA1576
V
oAF2
1.7 V
DETUNE
DETECTOR
Z
8-10
(240
k
Z
9-10
(180
k
INDICATOR
DRIVER
STANDBY
SWITCH
INTERNAL
POWER
SUPPLY
W
)
W
)
4 V
(6 V
BE
)
G
I
11 =
0.5 mA
20 k
W
5.3 V
(18
5
V
T
)
10
V
i(det)
13
14
5
12
11
18
V
F
V
F0
FMON
V
ref
V
o(det)
GND
3.6 k
W
220 k
W
A
1 mA
1
nF
(25 k
W)
FM
on
0.47
m
F
10 k
W
MGE456
(AM)
field
strength
indicator
level output
for
field strength
zero adjustment
of field strength
indicator
+
(<23 V)
reference
voltage
detune
voltage
s de-emphasis: C
8
-
9
= 6.8 nF; for stereo operation C
8
-
9
=56pF.
(2) L = 0.38
m
H; Q
o
= 70; Q
L
= 20; adjusted to minimum 2
nd
harmonic distortion (d
2
); at V
i
= 1 mV; coil: 6 turns CuL (0.25 mm) on coil former KAN (C).
m
Fig.1 Block diagram and test circuit.
(1) For 50
Philips Semiconductors
Product specification
FM/IF amplifier/demodulator circuit
TDA1576
PINNING
SYMBOL PIN
DESCRIPTION
V
P
1
positive supply voltage
C
PS
2
smoothing capacitor of power supply
IF1
3
IF signal to resonant circuit
handbook, halfpage
V
P
RES1
4
resonant circuit input 1
1
18
GND
FMON
5
FM-ON, standby switch
C
PS
2
17
V
FB1
RES2
6
resonant circuit input 2
IF1
3
16
V
FB2
IF2
7
IF signal to resonant circuit
RES1
4
15
V
ilF
V
oAF1
8
AF output voltage 1 (0
°
phase)
FMON
5
TDA1576
14
V
F0
V
oAF2
9
AF output voltage 2 (180
phase)
V
F
RES2
6
13
V
i(det)
10 detune detector input voltage for
external audio reference
IF2
7
12
V
ref
V
o(det)
11 detune detector output voltage
V
oAF1
V
oAF2
8
11
V
o(det)
V
ref
12 reference voltage output
9
10
V
i(det)
V
F
13 level output for field strength
MBH286
V
F0
14 zero adjust voltage for field strength
V
iIF
15 FM/IF input signal voltage
V
FB2
16 DC feedback 2
V
FB1
17 DC feedback 1
Fig.2 Pin configuration.
GND
18 ground (0 V)
1998 Nov 18
4
°
Philips Semiconductors
Product specification
FM/IF amplifier/demodulator circuit
TDA1576
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
P
supply voltage (pin 1)
0
23
V
V
2
voltage on pin 2
0
V
P
V
V
5, 14
voltage on pins 5 and 14
0
23
V
V
12
voltage on pin 12
0
7
V
V
13
voltage on pin 13
0
6
V
P
tot
total power dissipation
0
800
mW
T
stg
storage temperature
-
55
+150
°
C
T
amb
operating ambient temperature
-
30
+80
°
C
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
VALUE
UNIT
R
th j-a
thermal resistance from junction to ambient in free air
80
K/W
1998 Nov 18
5
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