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TDA7021T 数据表(PDF) 2 Page - NXP Semiconductors

部件名 TDA7021T
功能描述  FM radio circuit for MTS
Download  13 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TDA7021T 数据表(HTML) 2 Page - NXP Semiconductors

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May 1992
2
Philips Semiconductors
Product specification
FM radio circuit for MTS
TDA7021T
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
• RF input stage
• Mixer
• Local oscillator
• IF amplifier/limiter
• Frequency detector
• Mute circuit
• MTS compatible
• Loop amplifier
• Internal reference circuit
• LF amplifier for
− mono earphone amplifier or
− MUX filter
• Field-strength dependent channel separation control
facility
QUICK REFERENCE DATA
PACKAGE OUTLINE
16-lead mini-pack; plastic (SO 16; SOT109A); SOT109-1; 1996 July 24.
PARAMETER
CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Supply voltage (pin 4)
VP = V4-3
1,8
6,0
V
Supply current
VP = 3 V
l4
6,3
mA
RF input frequency
frf
1,5
110
MHz
Sensitivity (e.m.f.) for
source impedance = 75
Ω;
−3 dB limiting
mute disabled
EMF
4
−µV
Signal handling (e.m.f.)
source impedance = 75
EMF
200
mV
AF output voltage
Vo
90
mV


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