LA1845NV

Ordering number : ENN*7931 LA1845NV Monolithic Linear IC Single-Chip Home Stereo IC The LA1845NV is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning functions using SD/IF-count technique. It incorporates a pilot canceler and an adjustment-free MUX VCO circuit, thus allows additional parts to be reduced. Functions • AM : RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, SD, oscillator buffer, IF buffer, stereo IF output, AGC time constant switch • FM IF : IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output • MPX : PLL stereo decoder, stereo display, forced monaural, VCO stop, audio muting, adjacent channel interference rejection function, pilot canceler Features • Integrated MPX VCO (ceramic resonators are no longer required.) • Built-in adjacent channel interference rejection function (114kHz, 190kHz) • Supports both SD and IF-count techniques • Both FM SD sensitivity and bandwidth can be set • Pilot canceler built in. Maximum Ratings at Ta = 25°C Parameter Maximum Power Supply Voltage Allowable Power Consumption Symbol VCC max Pd max Ta = 80°C with board 114.3mm×76.1mm×1.6mm material : Glass epoxy resin Operating Temperature Storage Temperature Topr Tstg -20 to +80 -40 to +125 °C °C 360 mW Conditions Ratings 6 Unit V Operating Conditions at Ta = 25°C Parameter Recommended Supply Voltage Operating Supply Voltage Range Symbol VCC VCC op Ta = 80°C Conditions Ratings 5 4.3 to 5.5 Unit V V Any and all SANYO Semiconductor 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 Semiconductor representative nearest you before using any SANYO Semiconductor products described or contained herein in such applications. SANYO Semiconductor 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 Semiconductor products described or contained herein. 92706 / 91004 JO IM No.7931-1/10 LA1845NV Electrical Characteristics • Operating Characteristics at VCC = 8V, in the specified test circuit. FM Mono Characteristics at fc = 10.7MHz, Vi = 100dBµ, fm = 1kHz, Modulation = 75kHz Parameter Current Drain Demodulator Output Total Harmonic Distortion Signal-to-Noise Ratio AM Rejection Ratio 3dB Sensitivity SD Sensitivity IF Counter Buffer Output Mute Attenuation With no input signal 100dBµ, 100% modulation, fm = 1kHz 100dBµ, 100% modulation, fm = 1kHz 100dBµ, 100% modulation, fm = 1kHz 100dBµ, AM = 30% modulation, fm = 1kHz 100dBµ, 100% modulation, fm = 1kHz Output reference, -3dB input 0% modulation 100dBµ 100dBµ, 100% modulation, fm = 1kHz 38 200 73 47 Conditions Ratings min 20 230 typ 30 360 0.35 80 65 32 47 275 76 40 56 400 max 40 460 1.5 Unit mA mVrms % dB dB dBµ dBµ mVrms dB FM Stereo Characteristics at fc = 10.7MHz, Vi = 100dBµ, L+R = 90%, Pilot = 10%, fm = 1kHz Parameter Separation Stereo On Level Total Harmonic Distortion Adjacent Channel Rejection Ratio 1 Adjacent Channel Rejection Ratio 2 Carrier Leak Conditions L+R = 90%, Pilot = 10%, fm = 1kHz Pilot input Pilot input fs = 113kHz, VS = 90%, Pilot = 10% ; The left-right modulation, demodulated output fs = 189kHz, VS = 90%, Pilot = 10% ; The left-right modulation, demodulated output L+R = 90%, Pilot = 10% reference, Pilot = 10% output 38 Ratings min 30 1.5 typ 42 3.5 0.45 36 41 44 5.5 1.5 max Unit dB % % dB dB dB AM Characteristics at fc = 1000kHz, Vi = 80dBµ, fm = 1kHz, Modulation = 30% Parameter Current Drain Detector Output 1 Detector Output 2 Signal-to-Noise Ratio 1 Signal-to-Noise Ratio 2 Total Harmonic Distortion 1 Total Harmonic Distortion 2 SD Sensitivity Local Oscillator Buffer Output IF Counter Buffer Output With no input signal 23dBµ, 30% modulation, fm = 1kHz 80dBµ, 30% modulation, fm = 1kHz 23dBµ, 30% modulation, fm = 1kHz 80dBµ, 30% modulation, fm = 1kHz 80dBµ, 30% modulation, fm = 1kHz 107dBµ, 30% modulation, fm = 1kHz 0% modulation With no input signal 23dBµ 11 100 140 Conditions Ratings min 13 40 90 17 46 typ 27 80 160 23 52 0.4 0.5 20 140 285 1.1 1.3 29 200 400 max 39 160 230 Unit mA mVrms mVrms dB dB % % dBµ mVrms mVrms No.7931-2/10 LA1845NV Package Dimensions unit : mm 3175B Pin Description Pin No. 1 Pin function FM IF input Pin voltage Vreg Equivalent circuit Notes Input impedance ri = 330Ω 1 3 2 AM mixer output VCC Connect the mixer coil between this pin and VCC 2 3 REG 2.1 3 Vreg = 2.1V 4 AM IF input Vreg Input impedance ri = 2kΩ 4 5 6 7 GND Tu-LED ST-LED/AF-IF output 0V VCC Active low 6 7 Open collector 8 9 FM detector VCC VCC The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is recommended for detector coil. Continued on next page. No.7931-3/10 LA1845NV Continued from preceding page. Pin No. 10 Pin function AM/FM IF counter output, output control switch, mute switch Pin voltage 0V Equivalent circuit Notes V10≤0.5V : Reception state 1.4V≤V10≤2.2V : Muting on V10≥3.5V : IF counter output and muting on 10 11 Phase comparator low-pass filter (AM/FM switching) VCC-1.0 11 The device operates in AM mode when a current of over 200µA flows from pin. 12. 12 Pilot detector lowpass filter (Forced mono) (VCO stop) VCC-1.0 12 The device is forced to monaural when a current of over 50µA flows from this pin. The VCO is stopped when a current of over 200µA flows from this pin. The limit values for the resistor are the same as those for pin 11. 13 14 L outputs R outputs 3.2V Output impedance ro = 3.3kΩ 13 ( 15 Pilot canceler output Vreg 14 ) 15 3 16 Decoder input Vreg RNF Inverting input pin RNF = 20kΩ 16 17 PLL input Vreg Input impedance ri = 20kΩ 17 18 FM demodulator output Vreg+0.7 18 Output impedance ro = 2.3kΩ The channel separation can be adjusted with an external capacitor connected between this pin and ground. Continued on next page. No.7931-4/10 LA1845NV Continued from preceding page. Pin No. 19 Pin function AM detector output Pin voltage 0V (FM) 1.5V (AM) Equivalent circuit Notes Output impedance ro = 3.3kΩ 19 20 S meter, AM AGC 0.2V (FM) 0.9V (AM) The resistance of the built-in resistor R is 13.9kΩ. The SD response during seek operation is determined with the external capacitor connected to this pin. 20 R 21 AM RF input Vreg Must be used at the same potential as pin 22. 21 22 AFC Vreg The FM SD bandwidth can be adjusted with the external resistor connected between this pin and pin 3 (Vreg). 22 23 OSC VCC 23 Connect the oscillator coil between this pin and pin 9 (VCC). Note : Impedance of the secondary oscillator coil must be 5kΩ or higher. 24 Oscillator buffer output, FM SD sensitivity adjustment VCC-1.4 The FM SD sensitivity can be adjusted with an external resistor connected to this pin. R 24 Output impedance R = 200Ω Note : Resistance of the external resistor connected to the pin 24 must be 3.3kΩ or higher. No.7931-5/10 LA1845NV Equivalent Circuit Block Diagram No.7931-6/10 Test Circuit AM-IN (1MHz) 50Ω A 0.047µF 39MH 1000pF A 20kΩ 0.0047µF 0.015µF 15 14 13 0.015µF 65kΩ 18 17 16 20kΩ 0.1µF 22 µ F 0.01µF 22 21 20 19 10 µ F 3.3µF 4.7µF 0dB LPF LPF 0.047µF LOUT OSC BUFF 39pF 20pF ROUT 1000pF 5.6kΩ HW50425 6.8kΩ 24 23 LA1845NV LA1845NV 1 3 4 6 7 8 ST-LED V-ST 1000pF AM IF 50kΩ TU-LED V-SD HW6215 50kΩ 5 2 FM-IN (10.7MHz) 9 10 11 1µF 3kΩ 10kΩ 1000pF NORMAL AM/FM IF-BUFF 20pF SEEK 0.47µF 12 300Ω 1µ F 75 Ω 0.047µF FM AM MONO VCC 5.0V 600BEAS-10471 Detector coil Discriminator 33 µ F 0.047µF Top view No.7931-7/10 LA1845NV No.7931-8/10 LA1845NV No.7931-9/10 LA1845NV Specifications of any and all SANYO Semiconductor 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 Semiconductor 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 Semiconductor 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 exported without obtaining the export 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 Semiconductor 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 Semiconductor 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 Semiconductor 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 September, 2004. Specifications and information herein are subject to change without notice. PS No.7931-10/10