UPC2533 Datasheet, PDF (1/36 Pages) NEC – AM TUNER FOR ELECTRONIC TUNING CAR RADIOS

DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µPC2533
AM TUNER FOR ELECTRONIC TUNING CAR RADIOS
The µPC2533 is an IC developed as an AM tuner for car stereos and car radios.
It employs an up-conversion type double super-heterodyne configuration (IF1 = 10.71 MHz, IF2 = 450 kHz).
The internal configuration consists of the MIX1 block (MIX1, OSC1, Buff1), MIX2 block (MIX2, OSC2, Buff2), IF
amplifier, detection circuit, AGC circuit, signal meter circuit, SD (station detector) circuit, and Lo/DX (short range/long
range) circuit.
Features
• Possible to select stations using only one varactor diode with narrow variable capacitance range
• Tracking adjustment unnecessary
• Coil switching between LW (long wave) and MW (middle wave) unnecessary
• Less sensitivity deviation due to tracking error
• High S/N: 60 dB
• Signal meter output with good linearity
• Signal meter output voltage inclination setting possible by external resistor.
• Can be used with IF (intermediate frequency) counter turning system or high/low tuning system.
Type Number
µPC2533GS-01
µPC2533GS-02
SD Sensitivity Setting
IF Counter Output High/Low Output
Set by pin No. 7 Set by pin No. 9
Signal Meter Voltage
Inclination Setting
Depends on SD
sensitivity setting
Set by pin No. 7
Set by pin No. 9
Remarks
SD sensitivity of IF counter
system and high/low system
can be set independently.
Tilt of the signal meter
voltage can be set without
regard to SD sensitivity.
• LO/DX function on-chip
• Since IFT (intermediate frequency transformer) turn ratio is free from limitation for matching of ceramic filter
impedance, it is easy to design MIX gain with IFT.
The information in this document is subject to change without notice.
Document No. S11989EJ4V0DS00 (4th edition)
Date Published August 1998 N CP(K)
The mark shows major revised points.
Printed in Japan
©
1993