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Ordering number:ENN3342B
Monolithic Linear IC
LA1875M
Single-chip, Electronic Tuner for Car Stereo
Overview
The LA1875M is an electronic tuner IC that incorporates AM, FM IF and MPX circuit sections on a single chip, making it ideal for use in car stereo equipment. The LA1875M features an antenna-damping AM AGC circuit with rapid charge and discharge characteristics. It also features an S-meter driver, tuning and FM-stereo LED outputs, FM soft-mute and forced mono modes and a no-adjustment MPX VCO. The LA1875M AM circuit comprises a mixer, oscillator, RF AGC, IF amplifier and IF buffer. The FM IF circuit comprises an IF amplifier, eqadrature detector, and AFC and IF buffer outputs. The MPX circuit comprises a VCO and stereo noise control (SNC) and high-cut control (HCC) circuits. The LA1875M operates from a 7 to 10V supply and is available in 36-pin MFPs.
Package Dimensions
unit:mm 3129-MFP36S
[LA1875M]
36 19
15.3 2.25 2.5max
0.4
0.8
0.85
SANYO : MFP-36S
Features
* AM, FM IF and MPX circuits. * Antenna-damping AM AGC circuit with rapid charge and discharge characteristics. * S-meter driver. * Tuning and FM-stereo LED outputs. * AFC and IF buffer outputs. * AM mixer, oscillator, AGC, IF amplifier and IF buffer. * FM IF amplifier, quadrature detector. * MPX no-adjustment VCO, SNC and HCC. * FM soft-mute and forced-mono modes. * 7 to 10V supply. * 36-pin MFP.
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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
11200TH (KT)/3272TS No.3342-1/12
0.1
0.65
1
18
0.25
9.2 10.5
7.9
LA1875M Specifications
Maximum Ratings at Ta = 25C
Parameter Supply voltage Power dissipation (Ta50C) Operating temperature range Storage temperature range Symbol VCC PD Topr Tstg Conditions Ratings 11 720 -30 to +80 -40 to +150 Unit V mW
C C
Recommended Operating Conditions at Ta = 25C
Parameter Supply voltage Supply voltage range Symbol VCC VCC Conditions Ratings 8.5 7 to 10 Unit V V
Electrical Characteristics FM characteristics at Ta = 25C, VCC=8.5V, fc=10.7MHz, fm=1kHz, 75kHz deviation unless otherwise noted.
Parameter Quiescent supply current -3dB limiting sensitivity Tuning LED turn-on input voltage Detector output voltage S-meter output voltage IF buffer output voltage SNC output voltage Tuning LED turn-on bandwidth Signal-to-noise ratio AM suppression ratio Sepatation Channel balance HCC output attenuation Stereo LED turn-on pilot tone modulation Stereo LED turn-off pilot tone modulation Total harmonic distortion Symbol ICCO -3dBLS VLED VO VSM VIF VSUB BWLED S/N AMR Sep CB LED-ON LED-OFF THD VI=100dB, V33=0.6V, fm=10kHz, See note. VI=100dB VI=100dB VI=100dB, mono signal VI=100dB, main channel signal No signal Referred to VI=100dB, Mute is ON. V26=2V VI=100dB No signal VI=100dB VI=80dB, V12=5V VI=100dB, V34=0.1V. See note. VI=100dB, V262V VI=100dB VI=100dB at 1kHz with 30% AM modulation VI=100dB, See note. Conditions Ratings min 21 27 43 165 0 5.0 200 85 66 38 30 -1.5 -10.0 1.8 typ 31 37 58 250 0.15 6.1 360 0.5 130 74 60 45 0 -5.0 3.2 2.2 0.5 0.5 2.5 2.5 +1.5 -0.5 5.0 max 41 47 73 345 0.7 7.0 540 5.0 180 Unit mA dB dB mV V mV mV kHz dB dB dB dB dB % % %
Note VI comprises 90% left + right signal and 10% pilot signal. AM characteristics at Ta = 25C, VCC=8.5V, fc=1MHz with 30% modulation.
Parameter Quiescent supply current Tuning LED turn-on input voltage RF AGC turn-on input voltage Detector output voltage IF buffer output voltage S-meter output voltage Pin-diode driver current Signal-to-noise ratio Total harmonic distortion Symbol ICCO VLED VAGC VO VIF VSM Iantd S/N THD No signal V26=2V VI=3V VI=25dB VI=74dB VI=50dB, V12=5V No signal VI=74dB VI=0.7V VI=25dB VI=74dB VI=74dB VI=130dB Conditions Ratings min 16 21 50 18 70 150 0 2.6 2.0 17 42 typ 24 30 57 40 105 260 0.7 3.7 2.5 21 49 0.35 0.4 1.0 2.0 max 33 39 64 68 156 390 1.3 5.2 3.0 Unit mA dB dB mV mV V mA dB %
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LA1875M
Block Diagram
Sample Printed Circuit Pattern
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Specified Test Ciruit
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LA1875M
Sample Application Circuit
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LA1875M
LA1875M Coil Specifications T1 RF double tuning coil (Primary)
T2 RF double tuning coil (Secondary)
T3 AM IFT Coil (Matching Coil for SFZ 450 HL3)
T4 AM OSC Coil
T5 FM DET Coil
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IC Internal Equivalent Circuit Diagrams
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Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be expor ted without obtaining the expor t license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. 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 January, 2000. Specifications and information herein are subject to change without notice.
PS No.3342-12/12

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