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PDF UPC2533 Data sheet ( Hoja de datos )
| Número de pieza | UPC2533 | |
| Descripción | AM TUNER FOR ELECTRONIC TUNING CAR RADIOS | |
| Fabricantes | NEC | |
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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)
Printed in Japan
The mark shows major revised points.
©
1993
1 page  
Pin No.
6
Symbol
SD ACOUT
Name
SD AC output
7 SD ACadj SD AC sensitivity setting
(and signal meter ouput)
µPC2533
Equivalent Circuit
(2/7)
RO = 20.5 kΩ ±20 %
500 Ω
6
20 kΩ
( µ PC2533GS-01)
VCC
[SDadj]
[SD AC sensitivity and SD DC
sensitivity setting]
8 SD IFIN
SD IF input
5 kΩ
7
( µ PC2533GS-02)
VCC
5 kΩ
7
5.2 V
Vref
60 kΩ
500 Ω
8
5
5 Page 
µPC2533
2. Operation of Each Block
2.1 FR Amplifier Circuit Block
VCC
R1
C8
L3 R2
Q1
+
L1 Q2 C9
L2
C1
C2
Fig. 2-1 RF Ampliier Circuit
LPF
L4 L5
C6
33
C3 C4 C5
30
C7
35
36
34
+
MIX1
RF AGC
From MIX2
LO/DXNote
4
Note LO : 3 V or higher
DX : 1 V or lower
In the AM band, the capacitance of a car radio antenna depends on its length, diameter, cable length, etc. Therefore,
J-FET is used in the µPC2533 to raise RF input impedance.
Since the µPC2533 raises the first IF (intermediate frequency) to 10.71 MHz, there is no need for a tuning circuit
between the RF amplifier circuit and MIX1. Instead, it employs an LPF (about 6 MHz) consisting of L4, L5 and C3
to C5 between the RF amplifier circuit and MIX1 in order to cut image frequency (21.4 MHz or higher). Because this
allows a wide-band RF amplifier circuit to be configured without using a tuning circuit, frequency sensitivity deviation
can be minimized to a high degree.
The AGC circuit consists of RF AGC1 by the PIN diode connected to the FET gate and RF AGC2 by the cascade
transistor Q1. Use a low-noise transistor even with low current for the cascade transistor Q1 (if a high-noise one is
used, the S/N ratio deteriorates).
Remark Set bias voltage for cascade transistor Q1 to VC > VB.
11
11 Page | ||
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