Ordering number : EN2887B Monolithic Linear IC LA1805 AM/FM-IF/MPX Tuner System for Radio-Casette Recorders, Music Centers Overview Package Dimensions The LA1805 is a characteristics-improved version of the unit : mm LA1810, with the same pin assignment and package as 3067-DIP24S those of the LA1810. Improvements are made on the following point : [LA1805] 24 13 0.25 7.62 6.4 • Separation (35dB→48dB) and its dependence on freerunning frequency (Sep – fF Characteristic on page 4). • FM main distortion (0.8%→0.45%). • AM detection output (approximately 5dB increased). The constants on five external parts are changed as shown on page 10. 1 12 0.51min 3.3 3.25 3.9max 21.2 Functions 0.81 1.78 0.48 SANYO : DIP24S 0.95 • FM-IF : IF amp, quadrature detector, soft muting, tuning indicator. • MPX : PLL stereo decoder, stereo indicator, forced monaural, VCO stop. • AM :RF amp, MIX, OSC (with ALC), IF amp, detector, AGC, tuning indicator. Features • FM/AM/MPX functions contained on a single chip. • Minimum number of external parts required. • On-chip FM muting function. • High sensitivity. • Less carrier leak of MPX. Specifications Maximum Ratings at Ta=25°C, See specified Test Circuit. Parameter Symbol Conditions Pins 3, 7, 8, 11, 20, 21 Ratings Unit Maximum supply voltage VCC max 9 V Maximum supply current ICC max Pins 3+20+21 50 mA Flow-in current ILED Pins 7, 8 20 mA Flow-out current I23 Pin 23 0.1 mA Allowable power dissipation Pd max Ta≤70°C 500 mW Operating temperature Topr –20 to +70 °C Storage temperature Tstg –40 to +125 °C (Indicator drive current) SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 12798HA (KT)/D0994JN/4030MO/N148YT, TS No.2887-1/13 LA1805 Operating Conditions at Ta=25°C Parameter Symbol Conditions Ratings Recommended operating voltage VCC Operating voltage range VCC op Unit 4.5 V 3.0 to 8.0 V Note : The FM output level forms an N curve (LA1805) and an S curve (LA1806). LA1805 : N curve (for US band) LA1806 : S curve (for Japanese band). Your desired output level can be set by varying the output resistance. Operating Characteristics at Ta=25°C, VCC=4.5V, See Test Circuit Parameter Symbol Conditions min Ratings typ max Unit [FM characteristics (Mono) : fc=10.7MHz, fm=1kHz] Quiescent current Icco No input 13 20 mA –3dB sensitivity –3dBL.S. Referenced to VIN=100dBµ, 28 35 dBµ 100%, down 3dB Demodulation output VO VIN=100dBµ, 100% mod. 140 205 280 mV Channel balance C.B. VIN=100dBµ, 100% mod. 0 0 1.5 dB Total harmonic distortion THD VIN=100dBµ, 100% mod. 0.45 1.2 Signal to noise ratio S/N VIN=100dBµ, 100% mod. 70 80 LED ON sensitivity VLED IL=1mA 23 33 % dB 43 dBµ [FM characteristics (Stereo) : fc=10.7MHz, fm=1kHz, L+R=90%, pilot=10%, VIN=100dBµ] Separation Sep Stereo distortion THD (Main) LED ON level VLED-on LED OFF level VLED-off 32 2.4 48 dB 0.45 1.2 3.9 5.4 2.7 % % % [AM characteristics : fc=1000kHz, fm=1kHz] Quiescent current Icco No input Demodulation output VO1 VIN=23dBµ, 30% mod. 27 VO2 VIN=80dBµ, 30% mod. 70 S/N1 VIN=23dBµ, 30% mod. 17 21 dB S/N2 VIN=80dBµ, 30% mod. 50 55 dB THD1 VIN=80dBµ, 30% mod. 0.45 1.2 % THD2 VIN=100dBµ, 30% mod. 0.6 1.5 % VLED IL=1mA 24 32 dBµ Signal to noise ratio Total harmonic distortion LED on sensitivity 9.5 16 14.5 mA 50 90 mV 113 173 mV Note : Be fully careful of dielectric breakdown. Equivalent Circuit Block Diagram No.2887-2/13 LA1805 Test Circuit Polystyrene film capacitor Differs from the application circuit where a front end is used. (See Sample Application Circuit on page 10.) How to use the LA1805 Unit (resistance : Ω, capacitance : F) 1. Forced monaural mode. Figures 1 and 2 show how to cause the forced monaural mode to be entered. (1) Connect pin 14 to VCC through a resistor of 100kΩ. (Turn ON the SW1 in Figure 1.) (2) Connect pin 15 to GND through a resistor of 47kΩ. (Turn ON the SW2 in Figure 2.) Figure 1 Forced Monaural Mode Setting Method Figure 2 Forced Monaural Mode Setting Method Either above-mentioned (1) or (2) causes the forced monaural mode to be entered. In this case, the VCO does not stop operating. If the resistance of R1 and R2 are decreased, internal bias will vary when the S1 or S2 is turned ON. This data is shown in Figure 3. Free-running frequency – kHz Forced Monaural Mode Setting Resistance FreeRunning Frequency Figure 3 No.2887-3/13 LA1805 2. VCO Stop The VCO is so designed as to stop automatically at the AM mode. (when pin 11 and pin 21 are at the same potential) There is no pin available for stopping the VCO at the FM mode. However, the method shown right can be used to stop the VCO at the FM mode, causing the forced monaural mode to be entered. Make the wiring as short as possible. Figure 4 3. Free-running frequency measurement and adjustment Either of the following two methods is used to measure the free-running frequency. (1) Connect pin 13 to a frequency counter through the high input impedance amplifier. (2) Connect the connection point of the semifixed resistor connected to pin 13 and the fixed resistor to a frequency counter through the resistor of 240kΩ or greater. Measured error, ∆f – % Figure 6 Figure 5 How the error changes with the resistor value is shown in Figure 7. IF input 100dBµ Nonmodulation Resistor value, RX – kΩ 4. Separation setting capacitor Cs The separation characteristic for the LA1805 alone (IF input) differs from that for the antenna input with a front end. This difference is caused by the characteristics of the front end and ceramic filter. Shown right is how the separation characteristic changes with the separation setting capacitor value when the LA1186N is used as front end. Referring to this separation characteristic, choose the optimum separation for your set model. Separation, Sep – dB Figure 7 • When setting the free-running frequency, the following must be noted. Apply a 10.7MHz 100dBµ nonmodulation carrier as IF input signal and set to 76kHz±50Hz with the tuning indicator lighted. Free-running frequency, fF – kHz Figure 8 No.2887-4/13 LA1805 5. FM muting pin The external resistor connected to pin 12 can be used to vary the muting level (Figure 9). The abnormal sound at the time of side peak reception at the FM mode can be reduced by weak signal muting. LA1186N+LA1805 Attenuation – Detuning Frequency Attenuation – dB Noise, Output – dBm LA1186N+LA1805 Muting Characteristics Noise Input – dBµ Detuning frequency, f – kHz Figure 9 Figure 10 6. The following method can be used to change the LED ON sensitivity at the FM mode (Figure 11). The data on the LED ON sensitivity setting resistance and LED ON sensitivity is shown in Figure 12. Figure 11 Method to Change the LED ON Sensitivity at the FM Mode Unit (capacitance : F) LED ON sensitivity – dBµ LED ON Sensitivity – R Reference (R=Open) Resistance, R – Ω Figure 12 7. AM-FM selection The FM mode is entered with pin 11 open as shown in Figure 13. When pin 11 and pin 21 are made to be at the same potential in terms of DC, the AM mode is entered. It should be noted that the dynamic range is narrowed whether the potential at pin 11 is lower or higher than that at pin 21. Figure 13 8. If a noise appears in the detection output when the tuning LED goes ON at the AM mode, connect a capacitor across pin 8 and GND to eliminate the noise. No.2887-5/13 LA1805 FM Characteristics Total harmonic distortion, THD – % Demodulation output Noise, Detection output – dBm Noise, AM output, Demodulation output – dBm Total harmonic distortion, THD – % AM Characteristics ut AM outp Detection output No ise Noise Input – dBµ Selectivity Characteristic Input – dB/m Fidelity Characteristics input const. Response – dB Attenuation – dB 30% mod) tput (1kHz- Detection ou Ma x. w hist le ( Input – dB/m 2f1 ) Sensitivity – dB/m, Interference ratio – dB Detuning frequency, ∆f – kHz Whistle Characteristic Detection output, Whistle output – dBm Total harmonic distortion, THD – % Output 20mV const. Modulation frequency – Hz MW Reception Characteristic Tracking at each frequency ce IF interferen Image interfe frequency rence Usable sensitivity Max. sensitivity (1kHz-30% mod, output=20mV) Receiving frequency – kHz No.2887-6/13 LA1805 FM VCC Characteristics Total harmonic distortion, THD – % Demodulation output Detection output – dBm Total harmonic distortion, THD – % Sensitivity – dB/m Detection output – dBm LED ON sensitivity Max. sensitivity (output=20mV, 30% mod) LED ON sensitivity Supply voltage, VCC – V FM Temperature Characteristics Temperature Characteristics 0dBµ Demodulation output, input=10 S/N, input=100dBµ THD, input=100dBµ LED ON sensitivity Pilot level – mV Pilot modulation – % Ambient temperature, Ta – °C Total harmonic distortion, THD – % Output – dBm Sensitivity – dBµ S/N – dB Output – dBm Supply voltage, VCC – V Detection output, input=60dBµ THD, input=10 0dBµ , 1kHz-30 % mod Input S/N, input=60dBµ S/N=20dB sensitivity, 1kHz-30% mod LED sensi Total harmonic distortion, THD – % THD (100% mod) tivity Output 20mV sensitivity, 1kHz-30% mod Ambient temperature, Ta – °C Lamp ON Sensitivity – VCC ON level OFF level Supply voltage, VCC – V Capture range – % IF input Nonmodulation Separation, Sep – dB Sensitivity – dBµ Sensitivity – dBµ d) Detection output (100% mo AM VCC Characteristics IF input 100dBµ Supply voltage, VCC – V Supply voltage, VCC – V No.2887-7/13 Total harmonic distortion, THD – % LA1805 Separation, Sep – dB IF input 100dBµ (10.7MHz) IF input 100dBµ Frequency, f – Hz IF input 100dBµ Modulation, Dev. – kHz Free-Running Frequency Drift Characteristic Carrier leak – dB without de-emphasis carrier leak carrier leak Stereo (pilot modulation) with de-emphasis carrier leak IF input 100dBµ 0dB : mono output level Free-running frequency drift, ∆f – % Frequency, f – Hz Carrier Leak – VCC IEC input – dBµ Noise voltage, Detection output – dBm Pin4 voltage, V4 – V SW2 Characteristics Adjust so that THD is minimized. IF input 100dBµ Nonmodulation Ambient temperature, Ta – °C SW2 Characteristics Supply voltage, VCC – V Total harmonic distortion, THD – % IF input 100dBµ Total harmonic distortion, THD – % Total harmonic distortion, THD – % Supply voltage, VCC – V % mod) tput (30 n ou Detectio No ise IEC input – dBµ No.2887-8/13 LA1805 SW2 Characteristics Interference ratio – dB Sensitivity – dBµ SW2 Characteristic Oscillation voltage, VOSC – % Pin 24 voltage Usable sensitivity sitivity Max. sen Im inte age fr rfer equ enc enc y e Receiving frequency, fr – MHz Receiving frequency, fr – MHz SW Band Test Circuit Unit (capacitance : F) T1 : YT-30117 (Mitsumi), 2158-4095-319A (Sumida) T2 : HW-40184 (Mitsumi), 0237-1500 (Sumida) LW Characteristics tput lation ou Demodu ise No ANT input – dB/m ANT input – dB/m LW Band Test Circuit cy n freque Image rence e f r inte Max. se nsitivity Receiving frequency, fr – kHz Sensitivity – dB/m Interference ratio – dB Oscillation voltage, VOSC – mV LW Characteristics Us sen able siti vity Pin 4 voltage, V4 – V Total harmonic distortion, THD – % Noise output, Detection output – dBm LW Characteristics (Mitsumi) (Mitsumi) Unit (capacitance : F) No.2887-9/13 Note : The constants of parts *1 to *5 are changed from those of the LA1810. (Mitsumi) (Mitsumi) (Mitsumi) (Mitsumi) Unit (resistance : Ω, capacitance : F) (Mitsumi) (Mitsumi) (Mitsumi) LA1805 Sample Application Circuit : LA1186N+LA1805 FM/MW No.2887-10/13 LA1805 Sample Printed Circuit Pattern (See Sample Application Circuit.) (Cu-foiled area) Unit (resistance : Ω, capacitance : F) LA1186N + LA1805 Over Characteristics Detection output AM output Noise voltage ANT input voltage – dBµ Total harmonic distortion, THD – % Detection output, Noise voltage – dBm LA1186N + LA1805 Over Characteristics ANT input voltage – dBµ Differences between LA1805 and LA1806 (1) Same pin assignment (2) The internal circuit of the MPX OUT (pin 9, pin 10) is different as shown below. The FM S curve at pin 17 is in the opposite direction and the circuit in which AFC is provided is the same for the US band and Japanese band. The LA1805 contains the output load resistors (Output load resistance=6.8kΩ) For the LA1806, output load resistors RL, RR are connectedxternally. The graph of demodulation output vs. RL (RR) is shown below. No.2887-11/13 LA1805 Demodulation output – mVrms LA1806 FM Characteristic External load resistance, RL – kΩ Coil Specifications • MW bar antenna TN-10896 (Mitsumi) • AM IFT HW-6215 (Mitsumi) HW-6194 SFU-450B • MW OSC HW-6193 (Mitsumi) • SW2 OSC HW-40184 (Mitsumi) 0237-1500 (Mitsumi) • SW2 ANT YT-30117 (Mitsumi) 2158-4095-319A (Sumida) • LW bar antenna HH-50161 (Mitsumi) • FM quadrature YT-30103 (Mitsumi) • LW OSC MA-7014 (Mitsumi) No.2887-12/13 LA1805 No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibilty for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. 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, 1998. Specifications and information herein are subject to change without notice. No.2887-13/13