©

1993

DATA SHEET

BIPOLAR ANALOG INTEGRATED CIRCUIT

µPC2533

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.

SD Sensitivity Setting

Signal Meter Voltage

Type Number

IF Counter Output

High/Low Output

Inclination Setting

Remarks

µPC2533GS-01

Set by pin No. 7

Set by pin No. 9

Depends on SD

SD sensitivity of IF counter

sensitivity setting

system and high/low system

can be set independently.

µPC2533GS-02

Set by pin No. 7

Set by pin No. 9

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.

AM TUNER FOR ELECTRONIC TUNING CAR RADIOS

The information in this document is subject to change without notice.

The mark

shows major revised points.

Document No. S11989EJ4V0DS00 (4th edition)

Date Published August 1998 N CP(K)

Printed in Japan