Philips TDA1576T User Manual
INTEGRATED CIRCUITS
DATA SH EET
TDA1576T
FM/IF amplifier/demodulator circuit
Product specification
Supersedes data of February 1991
File under Integrated Circuits, IC01
1998 Nov 18
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576T
FEATURES
• Fully balanced 4-stage limiting IF amplifier
• Symmetrical quadrature demodulator
• Field strength indication output for 1 mA ammeter
GENERAL DESCRIPTION
The TDA1576T is a monolithic integrated FM/IF amplifier
circuit for use in mono and stereo FM-receivers of car
radios or home sets.
• Detune detector for side response and noise attenuation
• Detune voltage output
• Internal muting circuit
• 0° and 180° AF output signals
• Reference voltage output
• Electronic smoothing of the supply voltage.
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
P
I
P
V
iIF(rms)
supply voltage (pin 1) 7.5 8.5 15 V
supply current 10 16 23 mA
input sensitivity (RMS value) −3 dB before limiting 14 22 35 µV
S/N = 26 dB − 10 −µV
S/N = 46 dB − 55 −µV
V
oAF(rms)
THD total harmonic distortion with double
AF output voltage (RMS value) 60 67 75 mV
− 0.02 − %
resonant circuits
S/N signal-to-noise ratio V
α
AM
AM suppression − 50 − dB
>1mV − 72 − dB
i
RR ripple rejection f = 100 Hz 43 48 − dB
I
15
T
amb
maximum indicator output current −−2mA
operating ambient temperature −30 − +80 °C
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA1576T SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1998 Nov 18 2
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1998 Nov 18 3
BLOCK DIAGRAM
FM/IF amplifier/demodulator circuit TDA1576T
Philips Semiconductors Product specification
handbook, full pagewidth
2 V (RMS)
R
V
iIF
V
P
S
R
S
V
GND
20 19
25
kΩ
25
kΩ
V1 V2
V
+8.5 V
10 Ω
0.1 µF 47 µF
0.1 µF
FB1
TDA1576T
8.3 kΩ
P
0.1 µF
V
FB2
18
4-STAGE
LIMITER/
AMPLIFIER
PS
V
iIF
17
33 pF
560 pF
zero adjustment
of
field strength
indicator
V
F0
16
LEVEL DETECTOR
MUTE
ATTENUATOR
QUADRATURE
DEMODULATOR
RES1IF1C
QL = 20
fo = 10.7 MHz
1 mA
3.6 kΩ
V
15
FMON
RES2 IF2 V
FM
on
33 pF
field strength
detune
voltage
reference
voltage
1 nF 0.47 µF
F
+4.9 V
V
ref
14
REFERENCE
VOLTAGE
7654321
V
0.5
mA
AF
3.7 kΩ
oAF1
V
o(det)
13
DETUNE
DETECTOR
V2
3.7 kΩ
V
6.8 nF
audio
outputs
oAF2
−V
AF
V
12
i(det)
n.c.
11
1098
n.c.
MEH139
Fig.1 Block diagram.
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576T
PINNING
SYMBOL PIN DESCRIPTION
V
P
C
PS
IF1 3 IF signal to resonant circuit
RES1 4 resonant circuit input 1
FMON 5 FM-ON, standby switch
RES2 6 resonant circuit input 2
IF2 7 IF signal to resonant circuit
V
oAF1
V
oAF2
n.c. 10 not connected
n.c. 11 not connected
V
i(det)
V
o(det)
V
ref
V
F
V
F0
V
iIF
V
FB2
V
FB1
GND 20 ground (0 V)
1 positive supply voltage
2 smoothing capacitor of power supply
8 AF output voltage 1 (0° phase)
9 AF output voltage 2 (180° phase)
12 detune detector input voltage for
external audio reference
13 detune detector output voltage
14 reference voltage output
15 level output for field strength
16 zero adjust voltage for field strength
17 FM/IF input signal voltage
18 DC feedback 2
19 DC feedback 1
handbook, halfpage
V
1
P
C
2
PS
IF1
3
RES1
4
FMON
5
RES2
IF2
V
oAF1
V
oAF2
n.c. n.c.
TDA1576T
6
7
8
9
10
MEH140
Fig.2 Pin configuration.
20
GND
19
V
FB1
V
18
FB2
V
17
iIF
V
16
F0
V
15
F
V
14
ref
V
13
o(det)
V
12
i(det)
11
1998 Nov 18 4
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576T
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER MIN. MAX. UNIT
V
P
V
2, 5,16
P
tot
T
stg
T
amb
THERMAL CHARACTERISTICS
SYMBOL PARAMETER VALUE UNIT
R
th j-a
supply voltage (pin 1) 0 15 V
voltage on pins 2, 5 and 16 0 V
P
V
total power dissipation 0 450 mW
storage temperature −55 +150 °C
operating ambient temperature −30 +80 °C
thermal resistance from junction to ambient in free air 85 K/W
1998 Nov 18 5
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