LA1838 Sanyo Semiconductor Corporation, LA1838 Datasheet

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LA1838

Manufacturer Part Number
LA1838
Description
Single-Chip Home Stereo IC with Electronic Tuning Support
Manufacturer
Sanyo Semiconductor Corporation
Datasheet
Ordering number : EN5888
Overview
The LA1838 is designed for use in home stereo systems
and is a single-chip tuner IC that provides electronic
tuning functions for AM, FM IF, and MPX reception. It is
optimal for use in products that adopt an automatic tuning
system based on an IF count.
Functions
• AM:
• FM IF: IF amplifier, quadrature detector, S-meter, SD
• MPX: PLL stereo decoder, stereo display, forced
600
550
500
400
300
200
100
0
-40
RF amplifier, mixer, oscillator, IF amplifier,
detector, AGC, oscillator buffer, S-meter,
narrow-band SD, IF buffer
(signal detection), S-curve detection, IF buffer
output
monaural, VCO stop, post amplifier, audio
muting, adjacent channel interference rejection
function
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
-20
SANYO Electric Co.,Ltd. Semiconductor Company
Ambient temperature, Ta — C
0
Pd max - Ta
20
40
60
Single-Chip Home Stereo IC with Electronic
80
100
Features
• Integrated MPX VCO (External components are no
• Built-in adjacent channel interference rejection function
• Adjustment-free FM detector circuit (Uses a ceramic
• The AM and FM SD sensitivities can be set
• The AM and FM output levels can be set independently.
• Improved useable AM sensitivity and strong field
Package Dimensions
unit: mm
3061-DIP30S
1.15
longer required.)
(third and fifth order)
discriminator.)
independently.
distortion characteristics.
30
1
1.78
0.48
27.2
[LA1838]
0.95
Tuning Support
40999RM (OT) No. 5888-1/9
16
15
Monolithic linear IC
SANYO: DIP30S
LA1838

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LA1838 Summary of contents

Page 1

... Ordering number : EN5888 Overview The LA1838 is designed for use in home stereo systems and is a single-chip tuner IC that provides electronic tuning functions for AM, FM IF, and MPX reception optimal for use in products that adopt an automatic tuning system based count. Functions • AM: RF amplifier, mixer, oscillator, IF amplifier, ...

Page 2

... AM1 Total harmonic distortion THD AM2 LED indicator on sensitivity SD On-AM Local oscillator buffer output V OSC-AM IF counter buffer output V IFBuff- output V STIF-AM S-meter output V SM-AM LA1838 Symbol Conditions V max CC Ta ≤ 70°C Pd max Topr Tstg Symbol Conditions the specified test circuit. CC Conditions With no input signal 100 dBµ ...

Page 3

... METER TUNING STEREO DRIVE DRIVE GND AFC 0.047 F 0.01 F 18k 39mH LA1838 CDA10.7MGI-C (For use as the DUT socket board) The CDA10.7MG74 must be used for actual production models. (Series resistance: 270 ) AM - STEREO INPUT OUT R - OUT L.P.F L.P DECODER ANTI - BIRDIE MUTE ...

Page 4

... GND 0 V TU-LED ST-LED AF-IF output Vreg – 1 detector LA1838 • IFT YD-1073-1 (Mitsumi 86T 1 S YD-1073 Notes = 330 Ω Input impedance r i Connect the mixer coil between this pin and V Also used for the MPX regulator filter Input impedance kΩ ...

Page 5

... Post-amplifier inputs and outputs 18 Vreg 19 20 3.5 V MPS outputs 21 3.5 V LA1838 Notes Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.) When the narrow band SD function is not used, bypass this circuit with a 50 Ω resistor and a 0.047 µF capacitor in series The AM SD sensitivity is adjusted with an external resistor connected between this pin and ground V13 ≤ ...

Page 6

... REG Vreg 29 OSC Vreg Oscillator buffer output, 1.6 V (FM sensitivity 1.3 V (AM) adjustment LA1838 Notes Input impedance kΩ i Output impedance r = 3.0 kΩ o The channel separation can be adjusted with an external capacitor connected between this pin and ground. The V sub/V main ratio is set to be about 0 dB. ...

Page 7

... IF = 10.7 MHz, 100 kHzdev V = 90% S -10 PILOT = 10% Referenced to the -20 L-R demodulated output -30 -40 -50 -60 -70 -80 - 110 10 SD Sensitivity Adjustment Characteristics THD 100 110 120 Input, — 1.0 10 LA1836 LA1838 130 150 170 190 210 230 Frequency, f — kHz Rsdadj — k No. 5888-7/9 ...

Page 8

... - - -20 -25 -30 -35 - 0.01 0.1 1.0 Frequency — kHz Separation vs. Ambient Temperature Characteristics 90 S/N Mono 80 S/N Stereo -40 - Ambient temperature, Ta — C LA1838 Overall AM Characteristics 0 -10 -20 -30 -40 - MHz kHz, 30%mod Detector Output Frequency Characteristics ( -10 -15 -20 -25 -30 -35 -40 120 140 0.01 Distortion vs. Ambient Temperature Characteristics 1 ...

Page 9

... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of April, 1999. Specifications and information herein are subject to change without notice. LA1838 No. 5888-9/9 ...

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