Philips TEA5581T, TEA5581 Datasheet
INTEGRATED CIRCUITS
DATA SH EET
TEA5581
TEA5581T
PLL stereo decoder
Product specification
File under Integrated Circuits, IC01
June 1989
Philips Semiconductors Product specification
PLL stereo decoder
TEA5581
TEA5581T
GENERAL DESCRIPTION
The TEA5581 PLL stereo decoder is for car and medium-fi radios. It incorporates all the features provided by the
TEA5580 together with a source selector, muting circuit and output amplifiers with adjustable gain. It also features a
switch for radio or cassette function and a 228 kHz voltage-controlled oscillator (VCO) that is locked to the 19 kHz stereo
pilot tone by a phase-locked loop (PLL) system. Subcarrier frequencies of 19, 38, 57 and 114 kHz are regenerated via
I2L logic from the VCO output.
The PLL phase detector suppresses phase distortion due to the 57 kHz pilot tone from the German ‘Verkehrs Warnfunk’
(VWF) traffic warning system. Typical suppression of the 19 kHz stereo pilot tone is 40 dB. Adjacent channel interference
is prevented by the use of two demodulators, one driven by the 38 kHz decoding signal and the other at 114 kHz to
suppress the third harmonic of the multiplexed input signal.
The gain of the input amplifier can be adjusted by an external resistor and the circuit includes compensation for an IF
filter typical roll-off frequency of 50 kHz (2 dB down at 38 kHz).
The supply voltage range of the circuit is 7 V to 16 V.
Features
• Wide supply voltage range
• Automatic mono/stereo switching (pilot presence detector)
• Smooth stereo-to-mono change-over at weak signals (signal-dependent stereo channel separation)
• LED driver for stereo/mono indicator
• Suppresses:
third harmonics (114 kHz) of multiplexed signal to prevent interference from strong adjacent channels;
phase distortion due to the 57 kHz signal from VWF transmitters
• Pilot cancelling circuit to give added suppression of 19 kHz stereo pilot tone (up to 25 dB)
• IF filter roll-off compensation
• Source selector for radio or cassette input (typ. 90 dB)
• Mute circuit for 90 dB (typ.) muting of the output level
• Matrix and two output buffers with adjustable gain (max. 20 dB).
PACKAGE OUTLINES
TEA5581 : 16-lead DIL; plastic (SOT38); SOT38-1; 1996 August 16.
TEA5581T: 16-lead mini-pack; plastic (SO16L; SOT162A); SOT162-1; 1996 August 16.
June 1989 2
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June 1989 3
Philips Semiconductors Product specification
PLL stereo decoder
Fig.1 Block diagram.
TEA5581T
TEA5581
Philips Semiconductors Product specification
PLL stereo decoder
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
PARAMETER CONDITIONS SYMBOL MIN. MAX. UNIT
Supply voltage range V
LED-driver current (peak value) −I
Total power dissipation P
Storage temperature range T
Operating ambient
temperature range T
Electrostatic handling* V
From junction to ambient in free air
SOT38 R
SOT162 R
3-5
3M
tot
stg
amb
es
, V
9-5
− 18 V
− 75 mA
see derating curve Fig.2
−65 +150 °C
−30 +80 °C
TEA5581
TEA5581T
+600 V
th j-a
th j-a
75 K/W
95 K/W
Fig.2 Power derating curve.
*
Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ resistor.
June 1989 4
Philips Semiconductors Product specification
PLL stereo decoder
DC CHARACTERISTICS
Measured in the circuit of Fig.7; V = 8.5 V; T
positive into the IC.
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage R1 = 75 Ω V
Total current consumption without LED driver I
Power dissipation P
Voltage
pin 15 V
pins 12 and 16 V
DC output current
pins 2 and 14 −I14, −I
Output current
pin 3 −I
Switch “VCO-OFF”
voltage
Switch “VCO-OFF”
current
= 25 °C; all DC voltages are with respect to pin 5; all currents are
amb
TEA5581
TEA5581T
S
tot
tot
15
, V
12
16
3
V
7
I
7
7.0 8.5 18 V
− 15 20 mA
− 125 − mW
− 2.1 − V
3.2 3.6 4.0 V
225 320 450 µA
2
−−20 mA
− 2.2 − V
− 50 75 µA
June 1989 5
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