TDA7021 Philips, TDA7021 Datasheet - Page 2

• Manufacturer Part Number: TDA7021
• Description: FM radio circuit for MTS
• Manufacturer: Philips

Philips Semiconductors
GENERAL DESCRIPTION
The TDA7021T integrated radio receiver circuit is for portable radios, stereo as well as mono, where a minimum of
periphery is important in terms of small dimensions and low cost. It is fully compatible for applications using the
low-voltage micro tuning system (MTS). The IC has a frequency locked loop (FLL) system with an intermediate frequency
of 76 kHz. The selectivity is obtained by active RC filters. The only function to be tuned is the resonant frequency of the
oscillator. Interstation noise as well as noise from receiving weak signals is reduced by a correlation mute system.
Special precautions have been taken to meet local oscillator radiation requirements. Because of the low intermediate
frequency, low pass filtering of the MUX signal is required to avoid noise when receiving stereo. 50 kHz roll-off
compensation, needed because of the low pass characteristic of the FLL, is performed by the integrated LF amplifier.
For mono application this amplifier can be used to directly drive an earphone. The field-strength detector enables
field-strength dependent channel separation control.
Features
QUICK REFERENCE DATA
PACKAGE OUTLINE
16-lead mini-pack; plastic (SO 16; SOT109A); SOT109-1; 1996 July 24.
May 1992
Supply voltage (pin 4)
Supply current
RF input frequency
Sensitivity (e.m.f.) for
Signal handling (e.m.f.)
AF output voltage
RF input stage
Mixer
Local oscillator
IF amplifier/limiter
Frequency detector
Mute circuit
MTS compatible
FM radio circuit for MTS
3 dB limiting
PARAMETER
V
source impedance = 75 ;
mute disabled
source impedance = 75
P
= 3 V
CONDITIONS
2
Loop amplifier
Internal reference circuit
LF amplifier for
Field-strength dependent channel separation control
facility
mono earphone amplifier or
MUX filter
V
l
f
EMF
EMF
V
SYMBOL
4
rf
P
o
= V
4-3
1,8
1,5
MIN.
6,3
4
200
90
TYP.
Product specification
TDA7021T
6,0
110
MAX.
V
mA
MHz
mV
mV
UNIT
V