Ordering number : EN7930A Monolithic Linear IC LA1844 LA1844M For Home Stereo Single-chip Tuner IC Overview The LA1844, LA1844M 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. 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. • Package : DIP24S(300mil) [LA1844], MFP24S(300mil) [LA1844M] 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 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 usingany 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. 83006 / 52106 MS OT B8-7111 No.7930A-1/11 LA1844,LA1844M Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings Unit VCC max Pd max 9 V Ta ≤ 45°C 400 mW Ta ≤ 80°C 260 mW Operating temperature Topr -20 to +80 °C Storage temperature Tstg -20 to +150 °C Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Operating supply voltage range VCC op Conditions Ratings Unit 5 V 4.3 to 8.0 V Electrical Characteristics at Ta = 25°C FM Mono Characteristics at fC = 10.7MHz, VCC = 5V Ratings Parameter Current drain Demodulator output Total harmonic distortion Signal-to-noise ratio AM rejection ratio Symbol ICCO-FM Conditions With no input signal min 18 VOFM 100dBμ, 100% modulation, fm = 1kHz THDFM mono 100dBμ, 100% modulation, fm = 1kHz S/NFM 100dBμ, 100% modulation, fm = 1kHz 73 100dBμ, AM 30% modulation, fm = 1kHz 47 AMR 3dB sensitivity Vi-limit SD sensitivity LED Sens 210 100dBμ, 100% modulation, typ max Unit 28 38 mA 330 420 mVrms 0.35 1.5 80 65 32 % dB dB 40 dBμ fm = 1kHz output reference, -3dB input IF counter buffer output Mute attenuation VIFBuff-FM Mute-Att 0% modulation 100dBμ 37 47 57 dBμ 200 275 400 mVrms 100dBμ, 100% modulation, fm = 1kHz 76 dB FM Stereo Characteristics at fC = 10.7MHz, 100dBμ, VCC = 5V Ratings Parameter Separation Symbol Sep Stereo on level Total harmonic distortion Conditions min L+R = 90%, Pilot = 10%, fm = 1kHz 30 STON Pilot input 1.5 THD-main Pilot input Adjacent channel rejection ratio 1 BR1 Adjacent channel rejection ratio 2 BR2 fs = 113kHz, Vs = 90%, pilot = 10% : typ max 42 Unit dB 3.5 5.5 0.45 1.5 % % 36 dB 41 dB 44 dB The left - right modulation, demodulated output fs = 189kHz, Vs = 90%, pilot = 10% : The left - right modulation, demodulated output Carrier leak CL L+R = 90%, pilot = 10% reference, 38 pilot = 10% output AM Characteristics at fC = 1000kHz, VCC = 5V Ratings Parameter Current drain Symbol ICCO-AM typ max Unit 11 22 33 mA 23dBμ, 30% modulation, fm = 1kHz 40 80 160 mVrms VOAM2 80dBμ, 30% modulation, fm = 1kHz 90 160 230 mVrms S/NAM1 23dBμ, 30% modulation, fm = 1kHz 17 23 dB S/NAM2 80dBμ, 30% modulation, fm = 1kHz 48 54 dB THDAM1 80dBμ, 30% modulation, fm = 1kHz 0.4 1.1 THDAM2 107dBμ, 30% modulation, fm = 1kHz 0.5 1.3 % SD-Sens 0% modulation 21 31 dBμ VOAM1 Signal-to-noise ratio SD sensitivity min With no input signal Detector output Total harmonic distortion Conditions 11 % Local oscillator buffer output VOSC-AM With no input signal 100 140 200 mVrms IF counter buffer output VIFBuff-AM 23dBμ 140 285 400 mVrms No.7930A-2/11 LA1844,LA1844M Package Dimensions unit : mm 3067B [1844M] 3112B [LA1844] 21.0 12.5 0.25 12 1.0 0.15 0.35 (1.5) 0.1 1.7max (0.75) (3.25) (0.71) 1 0.95 0.51min 3.3 3.9 max 0.9 0.63 12 13 5.4 7.6 1 24 7.62 13 6.4 24 1.78 0.48 SANYO : DIP24S(300mil) SANYO : MFP24S(300mil) No.7930A-3/11 LA1844,LA1844M Block Diagram No.7930A-4/11 LA1844,LA1844M Test Circuit No.7930A-5/11 LA1844,LA1844M Pin Functions Pin No. Function Pin voltage (V) Equivalent circuit Notes 1 FM IF input Vreg Input impedance Ri = 330Ω 2 AM mixer output VCC Connect the mixer coil between this pin and VCC 3 REG 4 AM IF input 5 GND 6 Tu-LED 7 ST-LED / AM-IF 2.1 Vreg Vreg = 2.4V Input impedance Ri = 2kΩ 0 VCC Active low Open collector output 8 FM detector VCC The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is recommended for detector coil. 9 VCC 10 AM / FM IF 5.0 0 counter output, V10 ≤ 0.5V : Reception state (Normal) 1.4V ≤ V10 ≤ 2.2V : Muting on (Mute) V10 ≥ 3.5V : IF counter output and muting on (Seek) output control switch, mute switch 11 Phase comparator low-pass filter VCC-1.0 The device operates in AM mode when a current of over 200μA flows from pin 12. (AM/FM switching) Continued on next page. No.7930A-6/11 LA1844,LA1844M Continued from preceding page. Pin No. 12 Function Pilot detector VCC-1.0 Equivalent circuit Notes The device is forced to monaural when a current of low-pass filter over 50μA flows from this pin. (Forced mono) The VCO is stopped when a current of over 200μA (VCO stop) flows from this pin. 13 L outputs 14 R outputs 15 Pin voltage (V) Pilot canceler 3.2 Output impedance RO = 3.3kΩ Vreg output 16 Decoder input Vreg Inverting input pin RNF = 20kΩ 17 PLL input 18 FM demodulator Vreg Vreg+0.7 output Input impedance Ri = 20kΩ Output impedance RO = 2.3kΩ The channel separation can be adjusted with an external capacitor connected between this pin and ground. 19 AM detector output 20 0 (FM) Output impedance RO = 3.3kΩ 1.5 (AM) S meter, 0.2 (FM) The resistance of the built-in resistor R is 13.9kΩ AM AGC 0.9 (AM) The SD responce during seek operation is determined with the external capacitor connected to this pin. Continued on next page. No.7930A-7/11 LA1844,LA1844M Continued from preceding page. Pin No. Function Pin voltage (V) 21 AM RF input Vreg 22 AFC Vreg Equivalent circuit Notes Must be used at the same potential as pin 22 The FM SD bandwidth can be adjusted with the external resistor connected between this pin and pin 3 (REG) 23 OSC VCC 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, VCC-1.4 The FM SD sensitivity can be adjusted with an external resistor connected to this pin. FM SD sensitivity Output impedance RO = 200Ω adjustment Note: Resistance of the external resistor connected to the pin 24 must be 3.3kΩ or higher. No.7930A-8/11 LA1844,LA1844M No.7930A-9/11 LA1844,LA1844M No.7930A-10/11 LA1844,LA1844M 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 June, 2006. Specifications and information herein are subject to change without notice. PS No.7930A-11/11