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INTEGRATED CIRCUITS
TDA1574
Integrated FM tuner for radio receivers
Product specification |
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February 1985 |
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File under Integrated Circuits, IC01 |
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Philips Semiconductors |
Product specification |
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Integrated FM tuner for radio receivers |
TDA1574 |
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GENERAL DESCRIPTION
The TDA1574 is a monolithic integrated FM tuner circuit designed for use in the r.f./i.f. section of car radios and home-receivers. The circuit comprises a mixer, oscillator and a linear i.f. amplifier for signal processing, plus the following additional features.
Features
∙ Keyed automatic gain control (a.g.c.)
∙ Regulated reference voltage
∙ Buffered oscillator output
∙ Electronic standby switch
∙ Internal buffered mixer driving.
QUICK REFERENCE DATA
Supply voltage range (pin 15) |
VP |
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7 to 16 |
V |
Mixer input bias voltage (pins 1 and 2) |
V1, 2-4 |
typ. |
1 |
V |
noise figure |
NF |
typ. |
9 |
dB |
Oscillator output voltage (pin 6) |
V6-4 |
typ. |
2 |
V |
output admittance at pin 6 for f = 108,7 MHz |
Y22 |
typ. |
1,5 + j2 |
mS |
Oscillator output buffer |
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D.C. output voltage (pin 9) |
V9-4 |
typ. |
6 |
V |
Total harmonic distortion |
THD |
typ. |
−15 |
dBC |
Linear i.f. amplifier output voltage (pin 10) |
V10-4 |
typ. |
4,5 |
V |
noise figure at RS = 300 Ω |
NF |
typ. |
6,5 |
dB |
Keyed a.g.c. output voltage range (pin 18) |
V18-4 |
+ 0,5 to VP − 0,3 |
V |
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PACKAGE OUTLINE
18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 08.
February 1985 |
2 |
1985 February
3
Coil data
L1: TOKO MC-108, 514HNE-150014S14; L = 0,078 μH
L2: TOKO MC-111, E516HNS-200057; L = 0,08 μH
L3: TOKO coil set 7P, N1 = 5,5 + 5,5 turns, N2 = 4 turns
Fig.1 Block diagram and test circuit.
receivers radio for tuner FM Integrated
TDA1574
Semiconductors Philips
specification Product
Philips Semiconductors |
Product specification |
|
|
Integrated FM tuner for radio receivers |
TDA1574 |
|
|
FUNCTIONAL DESCRIPTION
Mixer
The mixer circuit is a double balanced multiplier with a preamplifier (common base input) to obtain a large signal handling range and a low oscillator radiation.
Oscillator
The oscillator circuit is an amplifier with a differential input. Voltage regulation is achieved by utilizing the symmetrical tanh-transfer-function to obtain low order 2nd harmonics.
Linear IF amplifier
The IF amplifier is a one stage, differential input, wideband amplifier with an output buffer.
Keyed AGC
The AGC processor combines narrowand wideband information via an RF level detector, a comparator and an ANDing stage. The level dependent, current sinking output has an active load, which sets the AGC threshold.
The AGC function can either be controlled by a combination of wideband and narrowband information (keyed AGC), or by a wideband information only, or by narrowband information only. If only narrow-band AGC is wanted pin 3 should be connected to pin 5. If only wideband AGC is wanted pin 12 should be connected to pin 13.
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Supply voltage (pin 15)
Mixer output voltage (pins 16 and 17)
Standby switch input voltage (pin 11)
Reference voltage (pin 5)
Field strength input voltage (pin 12)
Total power dissipation
Storage temperature range
Operating ambient temperature range
THERMAL RESISTANCE
From junction to ambient (in free air)
Note
All pins are short-circuit protected to ground.
VP = V15-4 |
max. |
18 |
V |
V16, 17-4 |
max. |
35 |
V |
V11-4 |
max. |
23 |
V |
V5-4 |
max. |
7 |
V |
V12-4 |
max. |
7 |
V |
Ptot |
max. |
800 mW |
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Tstg |
−55 to + 150 |
°C |
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Tamb |
−40 to + 85 |
°C |
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Rth j-amb |
= |
80 K/W |
February 1985 |
4 |
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