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| Ordering number : ENN7185 Monolithic linear IC LA1845N, 1845NM Single-Chip Home Stereo IC Overview The LA1845N/1845NM is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning functions using SD/IF-count technigue. It incorporates a pilot canceler and an adjustment-free MUX VCO circuit, thus allows additional parts to be reduced. Package Dimensions unit: mm 3067A-DIP24S [LA1845N] 21.0 24 13 7.62 6.4 * 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 1 0.9 12 (0.71) 1.78 0.48 0.95 0.51min unit: mm 3112A-MFP24S [LA1845NM] 24 13 Features * Integrated MPX VCO (ceramic resonators are no longer required.) * Built-in adjacent channel interference rejection function (114 kHz, 190 kHz) * Supports both SD and IF-count techniques * Both FM SD sensitivity and bandwidth can be set * Pilot canceler built in. 5.4 3.3 3.9max (3.25) SANYO: DIP24S 12.5 0.15 0.35 1.0 0.1 1.5 (0.75) SANYO: MFP24S 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 91002RM (OT) No. 5888-1/10 0.63 1 12 1.7max 7.6 0.25 Functions LA1845N, 1845NM Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Symbol VCC max Pd max Allowable power dissipation Pd max Pd max Operating temperature Storage temperature Topr Tstg Ta 45C Ta = 80C (DIP) Ta = 80C (MFP) Conditions Ratings 9 400 400 260 -20 to +80 -40 to +125 Unit V mW mW mw C C Operating Conditions at Ta = 25C Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCCop Ta = 80C Conditions Ratings 8 4.3 to 8.5 Unit V V Operating Characteristics at Ta = 25C, VCC = 8 V, in the specified test circuit. Parameter Symbol Conditions Ratings min typ max Unit [FM Mono Characteristics] fc = 10.7 MHz, Vi = 100 dB, fm = 1 kHz, Mod = 75 kHz Current drain Demodulator output Total harmonic distortion Signal-to-noise ratio AM rejection ratio 3 dB sensitivity SD sensitivity IF counter buffer output Mute attenuation VIFBuff-FM Mute-Att ICCO-FM VOFM THDFM S/NFM AMR With no input signal 100 dB, 100% modulation, fm = 1 kHz 100 dB, 100% modulation, fm = 1 kHz 100 dB, 100% modulation, fm = 1 kHz 100 dB, AM 30% modulation, fm = 1 kHz 100 dB, 100% modulation, fm = 1 kHz, -3 dB input 0% modulation 100 dB, the pin 13 output 100 dB, 100% modulation, fm = 1 kHz 38 80 75 73 47 20 230 30 360 0.35 80 65 32 47 120 85 40 56 160 40 460 1.5 mA mVrms % dB dB dB dB mVrms dB [FM Stereo Characteristics] fc = 10.7 MHz, Vi = 100 dB, fm = 1 kHz, L + R = 90%, Pilot = 10% Separation Stereo on level Total harmonic distortion Adjacent channel rejection ratio 1 Adjacent channel rejection ratio 2 Carrier leak SepL STON Left channel modulated. The pin 16 output/the pin 17 output The pilot modulation such that V7 falls under 0.7 V 30 1.5 42 3.5 0.45 36 41 38 44 5.5 1.5 dB % % dB dB dB THD-main Left + right modulation. The pin 16 output. Brej-3rd Brej-5th fs = 113 kHz, Vs = 90%, pilot = 10% The left - right modulation, demodulated output fs = 189 kHz, Vs = 90%, pilot = 10% The left - right modulation, demodulated output L + R = 90%, pilot = 10% reference, pilot = 10% output [AM Characteristics] fc = 1000 kHz, Vi = 80 dB, fm = 1 kHz, Mod = 30% 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 VOSC-AM VIFBuff-AM ICCO-AM VOAM1 VOAM2 S/NAM1 S/NAM2 THDAM1 THDAM2 With no input signal 23 dB, 30% modulation, fm = 1 kHz 80 dB, 30% modulation, fm = 1 kHz 23 dB, 30% modulation, fm = 1 kHz 80 dB, 30% modulation, fm = 1 kHz 80 dB, 30% modulation, fm = 1 kHz 107 dB, 30% modulation, fm = 1 kHz 0% modulation With no input signal 23 dB 11 100 140 13 40 90 17 46 27 80 160 23 52 0.4 0.5 20 140 285 1.1 1.3 29 200 400 39 160 230 mA mVrms mVrms dB dB % % dB mVrms mVrms No. 5888-2/10 LA1845N, 1845NM Block Diagram (8.0 to 9.0 V) AC Test Circuit AM-IN (1MHz) 0.047F 50 0.047F OSC BUFF 1000pF 5.6k 39pF 20pF HW50425 39MH 3.3F 1000pF 4.7F 10F 22F 0.01F 6.8k 24 23 22 21 20 19 18 20k 17 16 15 14 13 20k 0.1F 65k 0.0047F 0.015F 0.015F A A 0dB LPF ROUT LPF LOUT LA1845N/1845NM FM-IN (10.7MHz) 75 1 300 0.047F 2 3 4 5 TU-LED V-SD 6 ST-LED V-ST Top view 7 8 9 10 11 1F 3k 10k 50k 1000pF AM IF 1000pF NORMAL AM/FM IF-BUFF 20pF SEEK 0.47F AM FM MONO VCC 8.0V 12 1F HW6215 33F 0.047F 50k 600BEAS-10471 detector coil No. 5888-3/10 LA1845N, 1845NM Pin Functions Pin No. Pin function Pin voltage Notes Equivalent circuit 1 1 FM IF input Vreg Input impedance ri = 330 3 A10635 2 2 AM mixer output VCC Connect the mixer coil between this pin and VCC A10636 3 3 REG 2.3 Vreg = 2.3 V A10635 4 AM IF input Vreg Input impedance ri = 2 k 4 A10637 5 GND 0V 6 7 6 7 TU-LED ST-LED / AF-IF output VCC VCC Active low Open collector A10638 8 FM detector VCC The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is recommended for detector coil. 9 VCC 10 AM / FM IF counter output, output control switch, mute switch V10 0.5 V: Reception state 0V 1.4 V V10 2.2 V: Muting on V10 3.5 V: IF counter output and muting on A10643 10 11 Phase comparator low-pass filter (AM/FM switching) The device operates in AM mode when a current of over 200 A flows from pin.12. VCC - 1.0 Limit values for the resistor: 2.7 k (When VCC = 7 V) 3.9 k (8 V) 11 A10641 Continued on next page. No. 5888-4/10 LA1845N, 1845NM Continued from preceding page. Pin No. Pin function Pin voltage Notes The device is forced to monaural when a current of over 50 A flows from this pin. 12 Pilot detector lowpass filter (Forced mono) (VCO stop) VCC - 1.0 The VCO is stopped when a current of over 200 A flows from this pin. The limit values for the resistor are the same as those for pin 11. Equivalent circuit 12 A10642 13 14 L outputs R outputs 3.2 V 3.2 V Output impedance ro = 3.3 k 13 ( 14 ) A10647 15 15 Pilot canceler output Vreg 3 A10645 RNF 16 Decoder input Vreg Inverting input pin RNF = 20 k 16 17 17 PLL input Vreg Input impedance ri = 20 k 18 Output impedance ro = 2.3 k 18 FM demodulator output Vreg + 0.7 (FM) Vreg + 0.7 (AM) The channel separation can be adjusted with an external capacitor connected between this pin and ground. A10649 100V 19 AM detector output 0 V (FM) 1.5 V (AM) Output impedance ro = 10 k 19 The resistance of the built-in resistor R is 13.9 k 20 S meter, AM AGC 0.2 V (FM) 0.9 V (AM) The SD responce during seek operation is determined with the external capacitor connected to this pin. 20 R A10651 Continued on next page. No. 5888-5/10 LA1845N, 1845NM Continued from preceding page. Pin No. Pin function Pin voltage Notes Equivalent circuit 21 AM RF input Vreg Must be used at the same potential as pin 22 21 A10653 22 AFC Vreg The FM SD bandwidth can be adjusted with the external resistor connected between this pin and pin 3 (Vreg) 22 23 23 OSC Vcc Connect the oscillator coil between this pin and pin 9 (Vcc) Note: Impedance of the secondary oscillator coil must be 5 k or higher. A10655 24 Oscillator buffer output, FM SD sensitivity adjustment The FM SD sensitivity can be adjusted with an external resistor connected to this pin. Vcc - 1.4 Output impedance ro = 200 Note: Resistance of the external resistor connected to the pin 24 must be 3.3 k or higher. R 24 A10656 No. 5888-6/10 LA1845N, 1845NM 10 0 AM Input/Output Characteristics 4.0 3.5 3.0 FM Input/Output Characteristics 1 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V Output voltage, VO -- dBV --10 S --20 --30 --40 --50 --60 --70 0 20 40 60 2.5 Vsm 2.0 1.5 1.0 Output voltage, VO -- dBV AM THD N 80 100 0.5 0 120 Input, INPUT -- dB ILA00967 Input, INPUT -- dB FM Input/Output Characteristics 2 S-meter voltage, Vsm -- V Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % FM Detuning Characteristics Input, INPUT -- dB Frequency, fc -- MHz Multiplex Frequency Characteristics 1 Total harmonic distortion, THD -- % Channel separation, Sep -- dB Multiplex Frequency Characteristics 2 Modulation frequency, fm -- Hz Modulation frequency, fm -- Hz AM Supply Voltage Characteristics 1 Signal-to-noise ratio, SN -- dB Channel separation, Sep -- dB AM Supply Voltage Characteristics 2 Output voltage, VO -- dBV Supply voltage, VCC -- V Supply voltage, VCC -- V No. 5888-7/10 AFC voltage, Vafc -- V LA1845N, 1845NM 0 --10 FM Supply Voltage Characteristics 1 S 9 8 7 6 50 FM Supply Voltage Characteristics 2 SD Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V Output voltage, VO -- dBV --20 --30 --40 --50 --60 --70 --80 --90 3 4 5 6 7 8 9 10 11 Sensitivity, Sens -- dB 40 Vsm100 5 4 3 2 30 LS Vsm70 AM THD Vsm0 20 N 1 0 12 10 3 4 5 6 7 8 9 10 11 12 Supply voltage, VCC -- V 60 ILA00975 6 12 Supply voltage, VCC -- V ILA00976 Multiplex Supply Voltage Characteristics 1 Multiplex Supply Voltage Characteristics 2 50 5 Total harmonic distortion, THD -- % Channel separation, Sep -- dB 10 40 SepR Vlon 4 ST sensitivity, VL -- % SepL THDmain 8 30 3 6 THDst 20 Vloff 2 4 THDsub 2 10 1 0 2 4 6 8 10 0 12 ILA00977 3.0 0 2 4 6 8 10 12 ILA00978 Supply voltage, VCC -- V 0 Supply voltage, VCC -- V 40 AM Temperature Characteristics 1 Vsm80 S AM Temperature Characteristics 2 Output voltage, VO -- dBV 2.5 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V --20 Sensitivity, Sens -- dB 30 Vsm40 --40 2.0 SN23 1.5 SD 20 Vsm0 1.0 --60 10 N THD --80 --40 --20 0.5 Ambient temperature, Temp -- C S 0 20 40 60 80 0 100 0 --40 --20 ILA00979 6 50 Ambient temperature, Temp -- C 0 20 40 60 80 100 ILA00980 0 FM Temperature Characteristics 1 Vsm1 00 FM Temperature Characteristics 2 SD Output voltage, VO -- dBV --20 5 4 --40 Vsm70 3 --60 Sensitivity, Sens -- dB 40 30 LS AM --80 2 20 N THD Vsm0 40 60 80 1 --100 --40 --20 Ambient temperature, Temp -- C 0 20 0 100 10 --40 --20 ILA00981 Ambient temperature, Temp -- C 0 20 40 60 80 100 ILA00982 No. 5888-8/10 LA1845N, 1845NM 5 FM Temperature Characteristics 3 THD 95C THD 75C 60 Multiplex Temperature Characteristics 1 Total harmonic distortion, THD -- % 3 THD --25C THD 0C THD 25C THD 50C AFC --25C AFC voltage, Vafc -- mV 4 Channel separation, Sep -- dB 50 Sep L SepR 40 2 AFC 0C AFC 50C AFC 95C 1 30 AFC 75C AFC 25C 0 10.6 10.7 --1.5 10.8 ILA00983 20 --40 --20 Input frequency, fc -- MHz 2.0 Ambient temperature, Temp -- C 0 20 40 60 80 100 ILA00984 Multiplex Temperature Characteristics 2 Signal-to-noise ratio, SN -- dB Muting attenuation, Matt -- dB 90 Multiplex Temperature Characteristics 3 Total harmonic distortion, THD -- % 1.5 80 S / Nmono S / Nst 1.0 70 t M At 0.5 THDmono THDmain THDst 60 0 --40 THDsub --20 Ambient temperature, Temp -- C CR+ 0 20 40 60 80 100 50 --40 --20 ILA00985 4.0 3.5 3.0 Ambient temperature, Temp -- C 0 20 40 60 80 100 ILA00986 8 Multiplex Temperature Characteristics 4 Free-running frequency drift, f -- % Capture range, CR -- % 6 4 Vlon 2 0 --2 --4 2.5 fF Vloff 2.0 1.5 1.0 CR---6 --8 --40 0.5 0 100 --20 Ambient temperature, Temp -- C 0 20 40 60 80 ILA00987 ST sensitivity, VL -- % No. 5888-9/10 LA1845N, 1845NM 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 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 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 September, 2002. Specifications and information herein are subject to change without notice. PS. No. 5888-10/10 |
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