Ordering number : EN7185C Monolithic Linear IC For Home Stereo IC LA1845N Single-Chip Tuner IC Overview The LA1845N 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. 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. Functions • AM : • FM-IF : • MPX : RF amplifier, mixer, oscillator, IF amplifier, detector AGC, SD, oscillator buffer, IF buffer, stereo IF output, AGC time constant switch IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output PLL stereo decoder, stereo display, forced monaural, VCO stop, audio muting, adjacent channel interference rejection function, pilot canceler Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 9 Allowable power dissipation Pd max Operating temperature Topr -20 to +80 °C Storage temperature Tstg -40 to +125 °C Ta = 80°C 400 V mW Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. 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. 70109 SY PC/O2703SI (OT) /91002RM (OT) No.7185-1/9 LA1845N Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Operating supply voltage range VCC op Conditions Ratings Ta = 80°C Unit 8 V 4.3 to 8.5 V Electrical Characteristics at Ta = 25°C, VCC = 8V, in the specified test circuit. Parameter Symbol Ratings Conditions min typ Unit max FM mono characteristics fc = 10.7MHz, Vi = 100dBμ, fm = 1kHz, Modulation = 75kHz Current drain ICCO-FM With no input signal Demodulator output VOFM 100dBμ, 100% modulation, fm = 1kHz Total harmonic distortion THDFM 100dBμ, 100% modulation, fm = 1kHz Signal-to-noise ratio S/NFM 100dBμ, 100% modulation, fm = 1kHz 73 AM rejection ratio AMR 100dBμ, AM 30% modulation, fm = 1kHz 47 3dB sensitivity 100dBμ, 100% modulation, fm = 1kHz Output reference, -3dB input SD sensitivity 0% modulation IF counter buffer output VIFBuff-FM 100dBμ Mute attenuation Mute-Att 100dBμ, 100% modulation, fm = 1kHz 20 230 30 40 mA 360 460 mVrms 0.35 1.5 80 % dB 65 dB 32 40 dBμ 38 47 56 dBμ 200 275 400 mVrms 76 dB FM stereo characteristics fc = 10.7MHz, Vi = 100dBμ, fm = 1kHz, L + R = 90%, pilot = 10% Separation SepL L + R = 90%, Pilot = 10%, fm = 1kHz 30 42 Stereo on level STON Pilot input 1.5 3.5 5.5 % Total harmonic distortion THD-main Pilot input 0.45 1.5 % Adjacent channel rejection ratio Brej-3rd fs = 113kHz, Vs = 90%, Pilot = 10% : The left - right modulation, demodulated output 36 dB Brej-5th fs = 189kHz, Vs = 90%, Pilot = 10% : The left - right modulation, demodulated output 41 dB 44 dB Carrier leak L + R = 90%, pilot = 10% reference, pilot = 10% output 38 dB AM characteristics fc = 1000kHz, Vi = 80dBμ, fm = 1kHz, Modulation = 30% Current drain ICCO-AM With no input signal 13 27 39 mA Detector output VOAM1 23dBμ, 30% modulation, fm = 1kHz 40 80 160 mVrms VOAM2 80dBμ, 30% modulation, fm = 1kHz 90 160 230 mVrms Signal-to-noise ratio Total harmonic distortion S/NAM1 23dBμ, 30% modulation, fm = 1kHz 17 23 dB S/NAM2 80dBμ, 30% modulation, fm = 1kHz 46 52 dB THDAM1 80dBμ, 30% modulation, fm = 1kHz THDAM2 SD sensitivity 107dBμ, 30% modulation, fm = 1kHz 0% modulation 0.4 1.1 % 0.5 1.3 % 11 20 29 dBμ 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.7185-2/9 LA1845N Package Dimensions unit : mm (typ) 3067B 13 1 12 0.95 0.9 0.51min 3.3 (3.25) 3.9 max 0.25 6.4 24 7.62 21.0 (0.71) 0.48 1.78 SANYO : DIP24S(300mil) Block Diagram OSC BUFF VT + FM SD ADJ OSC RF + V-SM + FM BAND-W 24 ALC 23 22 21 AM OSC AM MIX AM RF.AMP 20 BUFF FM IF AM/FM IF BUFF S-CURVE 18 17 16 15 L 14 DECODER ANTI-BIRDIE P-DET φ AM DET 13 PILOT CANCEL STEREO SW COMP VCO 304kHz FF 38K FF π 19K∠ 2 FF 19K∠0 PILOT DET TUNING DRIVE FM DET REG 1 19 AGC AM IF LEVEL DET R 2 3 VCC GND 4 5 6 7 8 9 10 11 12 450kHz TU-LED FM ST-LED FM-IN (10.7MHz) + AM/FM IF-BUFF + For AM stereo IFOUT + SEEK MUTE AM + ST MONO VCC (4.3 to 8.5V) Top view No.7185-3/9 LA1845N Test Circuit AM-IN (1MHz) OSC BUFF 39pF 0.047μF 50Ω 20pF HW50425 1000pF A 0.047μF + 5.6kΩ A 1000pF 4.7μF + 10μF + 0.01μF 22μF 39MH 3.3μF LPF LOUT 0dB 0.1μF 20kΩ LPF ROUT 0.0047μF 0.015μF 65kΩ 0.015μF 20kΩ 6.8kΩ 24 23 22 21 20 19 18 17 16 15 8 9 10 14 13 LA1845N 1 2 3 4 FM-IN (10.7MHz) 300Ω 0.047μF 75Ω 33μF + 5 6 7 TU-LED ST-LED V-SD V-ST HW6215 50kΩ 0.047μF 1000pF 10kΩ 50kΩ 1000pF AM/FM IF-BUFF 11 12 1μF 3kΩ 1μF + + + NORMAL 0.47μF FM AM 20pF SEEK MONO AM IF 600BEAS-10471 Detector coil Discriminator VCC 5.0V Top view Pin Functions Pin No. 1 Pin function FM IF input Pin voltage (V) Vreg Pin description Equivalent circuit Input impedance ri = 330Ω 1 3 2 AM mixer output 3 REG 4 AM IF input VCC 2.3 Vreg Connect the mixer coil between this pin and VCC. 2 Vreg = 2.3V 3 Input impedance ri = 2kΩ 4 5 GND 6 Tu-LED 7 ST-LED / 0 VCC VCC Active low Open collector 6 7 AM-IF output 8 FM detector VCC The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is recommended for detector coil. 9 10 VCC counter output, V10 ≤ 0.5V : Reception state 1.4V ≤ V10 ≤ 2.2V : Muting on output control V10 ≤ 3.5V : IF counter output and muting on AM / FM IF switch, mute 0 10 switch Continued on next page. No.7185-4/9 LA1845N Continued from preceding page. Pin No. 11 Pin function Phase comparator Pin voltage (V) Pin description VCC-1.0 The device operates in AM mode when a current of low-pass filter over 200μA flows from pin.12. (AM/FM switching) Limit values for the resistor : Equivalent circuit 11 2.7kΩ (When VCC = 7V) 3.9kΩ (8V) 12 Pilot detector VCC-1.0 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. 12 The limit values for the resistor are the same as those for pin 11. 13 L outputs 3.2 14 R outputs 3.2 Output impedance ro = 3.3kΩ 13 ( 14 ) 15 Pilot canceler output Vreg 15 3 16 Decoder input Vreg Inverting input pin RNF = 20kΩ RNF 16 17 PLL input Vreg Input impedance ri = 20kΩ 17 18 FM demodulator Vreg + 0.7 output Output impedance ro = 2.3kΩ The channel separation can be adjusted with an 18 external capacitor connected between this pin and ground. 19 AM detector output 0 (FM) Output impedance ro = 10kΩ 1.5 (AM) 100V 19 20 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 20 this pin. 21 AM RF input Vreg R 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 Continued on next page. No.7185-5/9 LA1845N Continued from preceding page. Pin No. 23 Pin function OSC Pin voltage (V) VCC Pin description Connect the oscillator coil between this pin and pin 9 (VCC). Equivalent circuit 23 Note : Impedance of the secondary oscillator coil must be 5kΩ or higher. 24 Oscillator buffer VCC-1.4 The FM SD sensitivity can be adjusted with an output, external resistor connected to this pin. FM SD sensitivity Output impedance ro = 200Ω adjustment Note : Resistance of the external resistor connected 24 to the pin 24 must be 3.3kΩ or higher. No.7185-6/9 LA1845N AM input/output characteristics 10 FM input/output characteristics 1 0 4.0 --10 3.0 S --20 2.5 Vsm 2.0 --40 1.5 --50 1.0 THD --60 0.5 N --70 0 20 40 60 80 0 120 100 --20 --40 --60 AM N --80 --100 0 20 40 Input, INPUT -- dBμ FM input/output characteristics 2 Total harmonic distortion, THD -- % 5 m 4 3 80 100 120 FM detuning characteristics 2.0 Vs S-meter voltage, Vsm -- V Total harmonic distortion, THD -- % 6 60 Input, INPUT -- dBμ 2 1 1.0 1.5 0.5 AF C 1.0 0 --0.5 0.5 AFC voltage, Vafc -- V --30 Output voltage, VO -- dBV 3.5 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V Output voltage, VO -- dBV S 0 THD THD 0 Total harmonic distortion, THD -- % 10 20 40 60 80 100 0 10.60 120 10.65 Frequency, fc -- MHz Multiplex frequency characteristics 2 1.0 60 st ma in mono 0.1 0.01 10 100 1k 10k L 50 40 R 30 20 10 100k 100 Modulation frequency, fm -- Hz 1k 10k 100k Modulation frequency, fm -- Hz 3.5 --20 Vsm80 2.5 --30 Vsm40 2.0 1.5 --40 --50 Vsm0 1.0 --60 THD 0.5 Signal-to-noise ratio, SN -- dB Channel separation, Sep -- dB 3.0 S AM supply voltage characteristics 2 40 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V AM supply voltage characteristics 1 --10 Output voltage, VO -- dBV --1.0 10.80 10.75 Input, INPUT -- dBμ sub 0 10.70 Multiplex frequency characteristics 1 Channel separation, Sep -- dB 0 30 SD SN23 20 10 N --70 3 4 5 6 7 8 Supply voltage, VCC -- V 9 0 10 0 3 4 5 6 7 8 9 10 Supply voltage, VCC -- V No.7185-7/9 LA1845N FM supply voltage characteristics 1 0 9 50 FM supply voltage characteristics 2 --20 7 --30 6 5 Vsm100 4 --50 Vsm70 --60 3 AM 2 --70 THD Vsm0 --80 N 1 0 10 --90 3 4 5 6 7 8 9 40 30 20 10 3 Supply voltage, VCC -- V Multiplex supply voltage characteristics 1 50 6 0 4 Vlon 30 20 3 2 Vloff 10 Output voltage, VO -- dBV SepL SepR 5 6 7 8 9 10 AM temperature characteristics 1 Vsm80 5 40 4 Supply voltage, VCC -- V ST sensitivity, VL -- % Channel separation, Sep -- dB 60 LS 3.0 S 2.5 Vsm40 20 --20 1.5 --40 Vsm0 1.5 --60 N 1 0.5 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V --40 SD Sensitivity, Sens -- dBμ 8 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V Output voltage, VO -- dBV S --10 THD 0 2 3 4 5 6 7 8 9 0 10 --80 --40 0 20 40 60 0 100 80 Ambient temperature, Ta -- °C Supply voltage, VCC -- V 40 --20 AM temperature characteristics 2 0 FM temperature characteristics 1 6 SN23 SD 20 10 4 --40 Vsm70 3 --60 AM --80 2 N 1 Vsm0 THD 50 --20 0 20 40 60 80 Sensitivity, Sens -- dBμ --20 0 20 40 60 Ambient temperature, Ta -- °C Ambient temperature, Ta -- °C FM temperature characteristics 3 5 40 LS 30 20 --20 0 20 40 60 Ambient temperature, Ta -- °C 80 100 4 0 100 80 FM temperature characteristics 2 SD 10 --40 --100 --40 100 Total harmonic distortion, THD -- % 0 --40 5 1.5 1.0 THD 75°C 3 THD -25°C THD 0°C THD 25°C THD 50°C 0.5 AFC -25°C 0 2 AFC 0°C AFC 50°C --0.5 1 AFC 75°C AFC 25°C 0 10.6 Total harmonic distortion, THD -- % S-meter voltage, Vsm -- V 30 00 Vsm1 --20 10.7 AFC voltage, Vafc -- mV Output voltage, VO -- dBV Sensitivity, Sens -- dBμ S --1.0 --1.5 10.8 Input frequency, fc -- MHz No.7185-8/9 LA1845N Multiplex temperature characteristics 1 2.0 Total harmonic distortion, THD -- % Channel separation, Sep -- dB 60 50 epL S SepR 40 30 Multiplex temperature characteristics 2 1.5 1.0 0.5 THDmono THDst THDmain THDsub --20 0 20 40 60 80 0 --40 100 --20 Ambient temperature, Ta -- °C Multiplex temperature characteristics 3 8 Free-running frequency drift, Δf -- % Capture range, CR -- % Signal-to-noise ratio, SN -- dB Muting attenuation, Matt -- dB 90 S/Nmono 80 S/Nst t M At 70 60 50 --40 --20 0 20 40 60 Ambient temperature, Ta -- °C 0 20 40 60 80 100 Ambient temperature, Ta -- °C 80 100 Multiplex temperature characteristics 4 4.0 CR+ 6 3.5 4 3.0 Vlon 2 2.5 ΔfF 0 2.0 Vloff --2 1.5 1.0 --4 ST sensitivity, VL -- % 20 --40 CR0.5 --6 --8 --40 --20 0 20 40 60 80 0 100 Ambient temperature, Ta -- °C SANYO Semiconductor Co.,Ltd. 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 Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents 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 Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of July, 2009. Specifications and information herein are subject to change without notice. PS No.7185-9/9