Philips TDA1574T User Manual
INTEGRATED CIRCUITS
DATA SH EET
TDA1574T
Integrated FM tuner for radio
receivers
Product specification
File under Integrated Circuits, IC01
August 1990
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
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.
August 1990 3
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.
August 1990 4
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