Ordering number : ENN7185 Monolithic linear IC LA1845N, 1845NM Single-Chip Home Stereo IC Overview Package Dimensions 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. unit: mm 3067A-DIP24S [LA1845N] 21.0 24 Functions • AM: 1 12 (3.25) (0.71) 1.78 0.48 3.3 3.9max 0.9 0.51min 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 0.25 7.62 6.4 13 0.95 SANYO: DIP24S unit: mm 3112A-MFP24S Features [LA1845NM] 12 0.15 0.63 5.4 12.5 1.7max 1 7.6 13 24 0.1 1.5 • 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. 0.35 1.0 (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 LA1845N, 1845NM Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage Conditions Ratings VCC max Allowable power dissipation Unit 9 V Pd max Ta ≤ 45°C 400 mW Pd max Ta = 80°C (DIP) 400 mW Pd max Ta = 80°C (MFP) 260 mw Operating temperature Topr –20 to +80 °C Storage temperature Tstg –40 to +125 °C Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Operating supply voltage range VCCop Conditions Ratings Ta = 80°C Unit 8 V 4.3 to 8.5 V Operating Characteristics at Ta = 25°C, 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 dBµ, fm = 1 kHz, Mod = 75 kHz Current drain Demodulator output ICCO-FM With no input signal 20 30 40 mA 230 360 460 mVrms 0.35 1.5 VOFM 100 dBµ, 100% modulation, fm = 1 kHz Total harmonic distortion THDFM 100 dBµ, 100% modulation, fm = 1 kHz Signal-to-noise ratio S/NFM 100 dBµ, 100% modulation, fm = 1 kHz 73 80 100 dBµ, AM 30% modulation, fm = 1 kHz 47 65 AM rejection ratio AMR 3 dB sensitivity 100 dBµ, 100% modulation, fm = 1 kHz, -3 dB input SD sensitivity 32 % dB dB 40 dBµ 0% modulation 38 47 56 dBµ IF counter buffer output VIFBuff-FM 100 dBµ, the pin 13 output 80 120 160 mVrms Mute attenuation Mute-Att 100 dBµ, 100% modulation, fm = 1 kHz 75 85 dB [FM Stereo Characteristics] fc = 10.7 MHz, Vi = 100 dBµ, fm = 1 kHz, L + R = 90%, Pilot = 10% Separation SepL Left channel modulated. The pin 16 output/the pin 17 output Stereo on level STON The pilot modulation such that V7 falls under 0.7 V Total harmonic distortion 30 42 1.5 3.5 5.5 % 0.45 1.5 % THD-main Left + right modulation. The pin 16 output. Adjacent channel rejection ratio 1 Brej-3rd fs = 113 kHz, Vs = 90%, pilot = 10% The left - right modulation, demodulated output Adjacent channel rejection ratio 2 Brej-5th fs = 189 kHz, Vs = 90%, pilot = 10% The left - right modulation, demodulated output Carrier leak L + R = 90%, pilot = 10% reference, pilot = 10% output dB 36 dB 41 dB 38 44 dB [AM Characteristics] fc = 1000 kHz, Vi = 80 dBµ, fm = 1 kHz, Mod = 30% Current drain ICCO-AM With no input signal 13 27 39 mA Detector output 1 VOAM1 23 dBµ, 30% modulation, fm = 1 kHz 40 80 160 mVrms Detector output 2 VOAM2 80 dBµ, 30% modulation, fm = 1 kHz 90 160 230 mVrms Signal-to-noise ratio 1 S/NAM1 23 dBµ, 30% modulation, fm = 1 kHz 17 23 Signal-to-noise ratio 2 S/NAM2 80 dBµ, 30% modulation, fm = 1 kHz 46 52 Total harmonic distortion 1 THDAM1 80 dBµ, 30% modulation, fm = 1 kHz 0.4 1.1 Total harmonic distortion 2 THDAM2 107 dBµ, 30% modulation, fm = 1 kHz 0.5 1.3 % 11 20 29 dBµ SD sensitivity 0% modulation dB dB % Local oscillator buffer output VOSC-AM With no input signal 100 140 200 mVrms IF counter buffer output VIFBuff-AM 23 dBµ 140 285 400 mVrms No. 5888-2/10 LA1845N, 1845NM Block Diagram (8.0 to 9.0 V) AC Test Circuit 0.047µF AM-IN (1MHz) 50Ω A OSC BUFF 39pF 20pF 39MH HW50425 1000pF 5.6kΩ 4.7µF 1000pF A 10µF 3.3µF 20kΩ 22µF 0.1µF 0.01µF 23 22 LOUT LPF ROUT 0.0047µF 65kΩ 6.8kΩ 24 LPF 0dB 0.047µF 0.015µF 0.015µF 20kΩ 21 20 19 18 17 16 15 14 8 9 10 11 13 LA1845N/1845NM FM-IN (10.7MHz) 75Ω 1 2 3 300Ω 4 5 V-SD 0.047µF HW6215 33µF 0.047µF Top view 6 TU-LED 50kΩ 7 12 1µF 1µF 3kΩ ST-LED V-ST 10kΩ 50kΩ 1000pF 1000pF NORMAL AM/FM IF-BUFF FM AM 20pF SEEK AM IF 0.47µF MONO VCC 8.0V 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 Ω 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 kΩ 4 A10637 5 GND 0V 6 6 7 TU-LED VCC Active low ST-LED / AF-IF output VCC Open collector 7 A10638 8 FM detector 9 VCC 10 AM / FM IF counter output, output control switch, mute switch VCC The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is recommended for detector coil. V10 ≤ 0.5 V: Reception state 0V 10 1.4 V ≤ V10 ≤ 2.2 V: Muting on V10 ≥ 3.5 V: IF counter output and muting on A10643 11 Phase comparator low-pass filter (AM/FM switching) The device operates in AM mode when a current of over 200 µA flows from pin.12. VCC – 1.0 11 Limit values for the resistor: 2.7 kΩ (When VCC = 7 V) 3.9 kΩ (8 V) A10641 Continued on next page. No. 5888-4/10 LA1845N, 1845NM Continued from preceding page. Pin No. Pin function Pin voltage Notes Equivalent circuit The device is forced to monaural when a current of over 50 µA flows from this pin. 12 Pilot detector lowpass filter (Forced mono) (VCO stop) VCC – 1.0 12 The VCO is stopped when a current of over 200 µA flows from this pin. The limit values for the resistor are the same as those for pin 11. 13 L outputs 3.2 V 14 R outputs 3.2 V A10642 13 Output impedance ro = 3.3 kΩ ( 14 ) A10647 15 15 Pilot canceler output 3 Vreg A10645 RNF 16 Decoder input Vreg 17 PLL input Vreg Inverting input pin 16 RNF = 20 kΩ 17 Input impedance ri = 20 kΩ 18 Output impedance ro = 2.3 kΩ 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 kΩ 19 The resistance of the built-in resistor R is 13.9 kΩ 20 S meter, 0.2 V (FM) AM AGC 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. 21 Pin function AM RF input Pin voltage Vreg Notes Must be used at the same potential as pin 22 Equivalent circuit 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 kΩ 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 Ω R 24 Note: Resistance of the external resistor connected to the pin 24 must be 3.3 kΩ or higher. A10656 No. 5888-6/10 LA1845N, 1845NM AM Input/Output Characteristics S 2.5 --20 Vsm 2.0 1.5 --40 1.0 --50 THD --60 0.5 N --70 0 20 40 60 80 100 Input, INPUT — dBµ AM 0 120 Input, INPUT — dBµ ILA00967 FM Detuning Characteristics Total harmonic distortion, THD — % S-meter voltage, Vsm — V Total harmonic distortion, THD — % FM Input/Output Characteristics 2 AFC voltage, Vafc — V Output voltage, VO — dBV 3.0 --10 Output voltage, VO — dBV 3.5 0 --30 FM Input/Output Characteristics 1 4.0 Total harmonic distortion, THD — % S-meter voltage, Vsm — V 10 Frequency, fc — MHz Multiplex Frequency Characteristics 2 Channel separation, Sep — dB Total harmonic distortion, THD — % Input, INPUT — dBµ Multiplex Frequency Characteristics 1 Modulation frequency, fm — Hz AM Supply Voltage Characteristics 2 Output voltage, VO — dBV Signal-to-noise ratio, SN — dB Channel separation, Sep — dB Modulation frequency, fm — Hz AM Supply Voltage Characteristics 1 Supply voltage, VCC — V Supply voltage, VCC — V No. 5888-7/10 LA1845N, 1845NM 9 8 --20 7 --30 6 Vsm100 4 Vsm70 --60 3 AM 2 --70 THD Vsm0 --80 N 1 --90 3 4 5 6 7 8 9 10 11 Supply voltage, VCC — V Multiplex Supply Voltage Characteristics 1 SepR 3 2 Vloff 0 12 0 4 6 8 10 Supply voltage, VCC — V 0 S 2.5 2.0 1.5 --40 Vsm0 1.0 --60 N 0.5 THD 0 0 20 40 60 80 Ambient temperature, Temp — °C 7 8 9 10 11 12 ILA00976 Multiplex Supply Voltage Characteristics 2 10 THDmain 8 THDst 6 4 THDsub 2 2 40 0 100 4 6 8 10 12 AM Temperature Characteristics 2 SN23 SD 20 10 0 --40 6 ILA00978 30 ILA00979 FM Temperature Characteristics 1 6 0 3.0 Vsm40 --20 5 Supply voltage, VCC — V --20 --80 --40 4 ILA00977 AM Temperature Characteristics 1 Vsm80 Output voltage, VO — dBV 12 1 10 2 20 3 6 4 Vlon 20 LS Supply voltage, VCC — V SepL 30 30 10 5 50 40 40 ILA00975 ST sensitivity, VL — % Channel separation, Sep — dB 60 0 12 Total harmonic distortion, THD — % --50 5 Sensitivity, Sens — dBµ --40 SD Sensitivity, Sens — dBµ --10 FM Supply Voltage Characteristics 2 50 Total harmonic distortion, THD — % S-meter voltage, Vsm — V Output voltage, VO — dBV S Total harmonic distortion, THD — % S-meter voltage, Vsm — V FM Supply Voltage Characteristics 1 0 50 --20 0 20 40 60 80 Ambient temperature, Temp — °C 100 ILA00980 FM Temperature Characteristics 2 S SD 5 4 --40 Vsm70 3 --60 --80 AM 2 N 1 --20 0 20 40 LS 30 20 Vsm0 THD --100 --40 Sensitivity, Sens — dBµ Output voltage, VO — dBV 00 Vsm1 --20 40 60 80 Ambient temperature, Temp — °C 0 100 ILA00981 10 --40 --20 0 20 40 60 80 Ambient temperature, Temp — °C 100 ILA00982 No. 5888-8/10 LA1845N, 1845NM FM Temperature Characteristics 3 THD --25°C THD 0°C THD 25°C THD 50°C 3 AFC --25°C 2 AFC 0°C AFC 50°C AFC 95°C 1 AFC 75°C AFC 25°C 0 10.6 --1.5 10.8 10.7 Input frequency, fc — MHz 0 --40 Free-running frequency drift, ∆f — % Capture range, CR — % 8 Signal-to-noise ratio, SN — dB Muting attenuation, Matt — dB THDst THDsub --20 0 20 40 60 40 30 90 1.0 THDmain L Sep SepR 20 --40 1.5 THDmono 50 ILA00983 Multiplex Temperature Characteristics 2 0.5 Multiplex Temperature Characteristics 1 80 Ambient temperature, Temp — °C ILA00985 Multiplex Temperature Characteristics 4 0 20 40 60 80 Ambient temperature, Temp — °C 100 ILA00984 Multiplex Temperature Characteristics 3 S / Nmono 80 S / Nst t M At 70 60 50 --40 100 --20 --20 0 20 40 60 80 Ambient temperature, Temp — °C 100 ILA00986 4.0 CR+ 6 3.5 4 3.0 Vlon 2.5 2 ∆fF 0 2.0 Vloff --2 1.5 --4 1.0 ST sensitivity, VL — % Total harmonic distortion, THD — % 2.0 Channel separation, Sep — dB THD 95°C THD 75°C 4 60 AFC voltage, Vafc — mV Total harmonic distortion, THD — % 5 CR---6 --8 --40 0.5 --20 0 20 40 60 80 Ambient temperature, Temp — °C 0 100 ILA00987 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