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NXP
NXP

TDA1576 Datasheet

FM/IF amplifier/demodulator circuit


TDA1576 Datasheet Preview


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
Page 1

Philips Semiconductors
FM/IF amplifier/demodulator circuit
Product specification
TDA1576
FEATURES
Symmetrical limiting IF amplifier
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.
GENERAL DESCRIPTION
The TDA1576 is a monolithic integrated FM/IF amplifier
circuit for use in mono and stereo FM-receivers of car
radios or home sets.
QUICK REFERENCE DATA
fo = 10.7 MHz; f = ±22.5 kHz; fm = 400 Hz; QL = 20; 50 µs de-emphasis.
SYMBOL
PARAMETER
CONDITIONS
MIN.
VP
IP
ViIF(rms)
supply voltage (pin 1)
supply current
input sensitivity (RMS value)
7.5
VP = 8.5 V
VP = 15 V
3 dB before limiting
S------N+-----N--- = 26 dB
S------N+-----N--- = 46 dB
VoAF(rms)
THD
S------N+-----N---
αAM
fi
Vi
IL
Tamb
AF output voltage (RMS value)
total harmonic distortion
single tuned circuit
two tuned circuits
signal plus noise-to-noise ratio
AM suppression
AFC offset drift
field strength indication
permissible indicator load current
operating ambient temperature
VP = 8.5 V
VP = 15 V
ViIF > 1 mV (RMS);
VP = 8.5 V
ViIF > 1 mV (RMS);
VP = 15 V
30
TYP.
16
18
22
8
35
67
135
0.1
0.02
76
80
50
±3
90
MAX.
20
±6
2
+80
UNIT
V
mA
mA
µV
µV
µV
mV
mV
%
%
dB
dB
dB
kHz
dB
mA
°C
ORDERING INFORMATION
TYPE
NUMBER
TDA1576
PACKAGE
NAME
DESCRIPTION
DIP18 plastic dual in-line package; 18 leads (300 mil)
VERSION
SOT102-1
1998 Nov 18
2
Page 2

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VFB1 17
RS
ViIF
0.1
µF
0.1 µF
VilF 15
RS VFB2 16
0.1
µF
VS
25 k
25 k
4-STAGE
LIMITER/
AMPLIFIER
LEVEL
DETECTOR
560
33 pF
pF
33
IF1 pF
3
L(2)
IF2 RES2
76
15 k
750
15 k
RES1
4
MUTING
250
QUADRATURE
DEMODULATOR
TDA1576
0.1 µF
5.5
k
+
10
47 µF
VP
(15 V)
1
CPS
2
8.3 k
AFC
voltage
+−
3.7 3.7
kk
8
VoAF1
9
VoAF2
(3.3 kΩ)
C8-9(1)
VoAF
INDICATOR
DRIVER
20 k
STANDBY
SWITCH
4V
(6 VBE)
INTERNAL
POWER
SUPPLY
1.7 V
5.3 V
(185 VT)
DETUNE
DETECTOR
G
I11 =
0.5 mA
3.6 k
13
VF
14
VF0
5
FMON
12
Vref
220 k
11
Vo(det)
A 1 mA
1 (25 kΩ)
nF
(AM)
field
strength
indicator
level output
for
field strength
zero adjustment
of field strength
indicator
FM
on 10 k
+
(<23 V)
reference
voltage
0.47 µF
detune
voltage
Z8-10
(240
k)
Z9-10
(180
k)
10 Vi(det)
18
GND
MGE456
(1) For 50 µs de-emphasis: C89 = 6.8 nF; for stereo operation C89 = 56 pF.
(2) L = 0.38 µH; Qo = 70; QL = 20; adjusted to minimum 2nd harmonic distortion (d2); at Vi = 1 mV; coil: 6 turns CuL (0.25 mm) on coil former KAN (C).
Fig.1 Block diagram and test circuit.
Page 3
Part Number TDA1576
Manufactur NXP
Description FM/IF amplifier/demodulator circuit
Total Page 16 Pages
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