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INTEGRATED CIRCUITS
DATA SH EET
TDA1574T
Integrated FM tuner for radio
receivers
Product specification
File under Integrated Circuits, IC01
August 1990
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Philips Semiconductors Product specification
Integrated FM tuner for radio receivers TDA1574T
GENERAL DESCRIPTION
The TDA1574T is an integrated FM tuner circuit designed for use in the RF/IF section of car radios and home receivers.
The circuit contains a mixer and an oscillator and a linear IF amplifier for signal processing. The circuit also incorporates
the following features.
Features
• Keyed Automatic Gain Control (AGC)
• Regulated reference voltage
• Buffered oscillator output
• Electronic standby switch
• Internal buffered mixer driving.
QUICK REFERENCE DATA
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage range
(pin 17) V
P
Mixer input bias voltage
(pins 1 and 2) V
1,2-4
Noise factor NF − 9 − dB
Oscillator output voltage
(pin 6) V
6-4
Output admittance at pin 6 f = 108.7 MHz Y22 − 1.5 + j2 ms
Oscillator output buffer
DC output voltage (pin 9) V
9-4
Total harmonic distortion THD −−15 − dB
Linear IF amplifier output
voltage (pin 12) V
Noise factor R
= 300 Ω NF − 6.5 − dB
S
12-4
Keyed AGC output voltage
range (pin 20) V
20-4
7 − 14 V
− 1 − V
− 2 − V
− 6 − V
− 4.5 − V
0.5 − VP−0.3 V
PACKAGE OUTLINE
20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 September 9.
August 1990 2
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Philips Semiconductors Product specification
Integrated FM tuner for radio receivers TDA1574T
Coil data
L1: TOKO MC-108, 514HNE-150023S14; 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.
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Philips Semiconductors Product specification
Integrated FM tuner for radio receivers TDA1574T
PINNING
1. Mixer input 1
2. Mixer input 2
3. Wideband information input
4. Ground
5. Voltage reference
6. Oscillator output
7. Oscillator input 1
8. Oscillator input 2
9. Buffered oscillator output
10. Not connected
11. Not connected
12. IF output
13. Standby switch
14. Narrowband information input
15. IF input 1
16. IF input 2
17. Supply voltage
18. Mixer output 1
19. Mixer output 2
20. AGC output
Fig.2 Pinning diagram.
FUNCTIONAL DESCRIPTION
Mixer
The mixer circuit uses a double balanced multiplier with a preamplifier (common base input) in order to obtain a large
signal handling range and low oscillator radiation.
Oscillator
The oscillator circuit uses an amplifier with a differential input. Voltage regulation is achieved by utilizing the symmetrical
tan h-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 narrowband information (keyed AGC) or by a
wideband/narrowband information only. If narrowband AGC is required pin 3 should be connected to pin 5. If wideband
AGC is required pin 14 should be connected to pin 15.
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