Philips Semiconductors
Product specification
RF/IF circuit for AM/FM radio
TEA5570
GENERAL DESCRIPTION
The TEA5570 is a monolithic integrated radio circuit for use in portable receivers and clock radios. The IC is also
applicable to mains-fed AM and AM/FM receivers and car radio-receivers. Apart from the AM/FM switch function the IC
incorporates for AM a double balanced mixer, 'one-pin' oscillator, i.f. amplifier with a.g.c. and detector, and a level
detector for tuning indication. The FM circuitry comprises i.f. stages with a symmetrical limiter for a ratio detector. A level
detector for mono/stereo switch information and/or indication complete the FM part.
Features
• Simple d.c. switching for AM to FM by only one d.c. contact to ground (no switch contacts in the i.f. channel, a.f. or
level detector outputs)
• AM and FM gain control
• Low current consumption (I = 6 mA)
tot
• Low voltage operation (V = 2,7 to 9 V)
P
• Ability to handle large AM signals; good i.f. suppression
• Applicable for inductive, capacitive and diode tuning
• Double smoothing of a.g.c. line
• Short-wave range up to 30 MHz
• Lumped or distributed i.f. selectivity with coil and/or ceramic filters
• AM and a.g.c. output voltage control
• Distribution of PCB wiring provides good frequency stability
• Economic design for 'AM only' receivers.
QUICK REFERENCE DATA (at T
= 25 °C)
amb
Supply voltage
Supply current
V = V
typ.
typ.
5,4 V
P
7-16
I
6,2 mA
7
AM performance (pin 2) for m = 0,3
Sensitivity
at V = 10 mV
V
V
V
typ.
typ.
typ.
typ.
1,7 µV
16 µV
o
i
at S/N = 26 dB
i
A.F. output voltage at V = 1 mV
100 mV
0,5 %
i
o
Total harmonic distortion at V = 1 mV
THD
i
FM performance (pin 1) for ∆f = ± 22,5 kHz
limiting sensitivity, −3 dB
V
typ.
typ.
typ.
typ.
typ.
110 µV
65 dB
100 mV
0,3 %
i
Signal-to-noise ratio for V = 1 mV
S/N
i
A.F. output voltage at V = 1 mV
V
o
i
Total harmonic distortion at V = 1 mV
THD
AMS
i
AM suppression at V = 10 mV
50 dB
i
PACKAGE OUTLINE
16-lead DIL; plastic (SOT38); SOT38-1; 1996 July 25.
September 1987
2
NXP [ NXP ]
