Philips tda1574 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA1574

Integrated FM tuner for radio
receivers

Product specification
File under Integrated Circuits, IC01

February 1985

Philips Semiconductors Product specification

Integrated FM tuner for radio receivers TDA1574

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) V
Mixer input bias voltage (pins 1 and 2) V

P
1, 2-4

7 to 16 V

typ. 1 V

noise figure NF typ. 9 dB

Oscillator output voltage (pin 6) V

6-4

typ. 2 V

output admittance at pin 6 for f = 108,7 MHz Y22 typ. 1,5 + j2 mS
Oscillator output buffer
D.C. output voltage (pin 9) V

9-4

typ. 6 V
Total harmonic distortion THD typ. −15 dBC
Linear i.f. amplifier output voltage (pin 10) V

noise figure at R

= 300 Ω NF typ. 6,5 dB

S

Keyed a.g.c. output voltage range (pin 18) V

10-4

18-4

typ. 4,5 V

+ 0,5 to VP− 0,3 V

PACKAGE OUTLINE

18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 08.

February 1985 2

Philips Semiconductors Product specification

Integrated FM tuner for radio receivers TDA1574

February 1985 3

Coil data

L1: TOKO MC-108, 514HNE-150014S14; L = 0,078 µH

L2: TOKO MC-111, E516HNS-200057; L = 0,08 µH

Fig.1 Block diagram and test circuit.

L3: TOKO coil set 7P, N1 = 5,5 +5,5 turns, N2 = 4 turns

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 narrow- and 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) V

Mixer output voltage (pins 16 and 17) V
Standby switch input voltage (pin 11) V
Reference voltage (pin 5) V
Field strength input voltage (pin 12) V
Total power dissipation P
Storage temperature range T
Operating ambient temperature range T

= V

P
16, 17-4
11-4
5-4
12-4
tot
stg
amb

15-4

max. 18 V
max. 35 V
max. 23 V
max. 7 V
max. 7 V
max. 800 mW

−55 to + 150 °C

−40 to + 85 °C

THERMAL RESISTANCE

From junction to ambient (in free air) R

th j-amb

= 80 K/W

Note

All pins are short-circuit protected to ground.

February 1985 4