Ordering number : EN5688C Monolithic Linear IC For Home Stereo IC with Electronic Tuning Support LA1837 Single-Chip IC Overview The LA1837 is a single-chip AM/FM IF and MPX IC that supports electronic tuning and was developed for use in home stereo systems. It is optimal for use in automatic station selection systems that use the SD and IF counting techniques. Features • On-chip MPX VCO (no external components required). • Adjacent channel interference rejection function (third and fifth order). • Supports both the SD and the IF counting techniques. • The AM and FM SD sensitivities can be set independently. • The AM and FM output levels can be set independently. • Improved AM practical sensitivity and high-input distortion characteristics. Functions • AM : • FM-IF : • MPX : RF amplifier, mixer, oscillator, IF amplifier, detector AGC, oscillator buffer, S-meter, narrowband SD, IF buffer IF amplifier, quadrature detector, S-meter, Scurve detector, IF buffer output PLL stereo decoder, stereo display, forced mono, VCO stop, post amplifier, audio muting, adjacent channel interference rejection function Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max Allowable power dissipation Pd max Operating temperature Topr -20 to +70 °C Storage temperature Tstg -40 to +125 °C Ta ≤ 70°C 12 V 550 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 / 62409 MS PC/82097HA(OT) No.5688-1/9 LA1837 Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Operating supply voltage range VCC op Conditions Ratings Unit 9 V 7 to 11 V Electrical Characteristics at Ta = 25°C, VCC = 9V, in the specified test circuit Parameter Symbol Ratings Conditions min typ Unit max FM Mono characteristics fc = 10.7MHz, fm = 1kHz, with the coil adjusted so that VAFC - VREG = 0V Current drain ICCO-FM With no input Demodulation output VOFM Channel balance C.B-mono Total harmonic distortion (mono) 18 31 44 100dBμ, 100% mod. The pin 16 output 730 1100 1460 mVrms 100dBμ, 100% mod. The pin 16 output/pin 17 output -1.5 0 +1.5 dB % THDFM(1) 100dBμ, 100% mod. The pin 16 output 0.3 1.3 THDFM(2) 100dBμ, 100% mod. The pin 16 output 1.0 5 Signal-to-noise ratio S/NFM 100dBμ, 100% mod. The pin 16 output AM rejection ratio AMR 100dBμ, 100% mod. The pin 16 output 45 65 Limiting input voltage -3dBL.S. 100dBμ, 100% mod. Referenced to the output. The input such that the output is down –3 dB. 26 32 72 80 mA % dB dB 38 dBμ dBμ LED sensitivity SDOn-FM 51 60 69 LED bandwidth SDBW 100dBμ 85 120 170 kHz IF count buffer output VIFBuff-FM 100dBμ, The pin 13 output 80 120 160 mVrms S-meter output VSM-FM(1) 0dBμ, The pin 11 output 0 0.1 0.5 V 5.0 Muting attenuation VSM-FM(2) 100dBμ, The pin 11 output 3.6 4.3 Mute-Att 100dBμ, 100% mod. The pin 16 output 75 85 V dB FM stereo characteristics fc = 10.7MHz, 100dBμ, fm = 1kHz, L + R = 90%, pilot = 10% Separation (left) SepL L mod. The pin 16 output/pin 17 output 30 45 dB Separation (right) SepR R mod. The pin 17 output/pin 16 output 30 45 dB Stereo on level STON The pilot modulation such that V7 is under 0.7V. 1.3 2.7 5 % 1.3 % Stereo off level STOFF The pilot modulation such that V7 is over 4.5V. 1.5 Total harmonic distortion (main) THD-main L + R mod. The pin 16 output 0.3 Adjacent channel interference Brej-3rd fs = 113kHz, VS = 90%, Pilot = 10%, 40 dB 40 dB rejection ratio % The pin 16 output vs. the L-R mod. 1kHz demodulated output Brej-5th fs = 189kHz, VS = 90%, Pilot = 10%, The pin 16 output vs. the L-R mod. 1kHz demodulated output AM characteristics fc = 1000kHz, fm = 1kHz Current drain Detector output Signal-to-noise ratio ICCO-AM With no input 15 25 35 mA VOAM(1) 23dBμ, 30% mod. The pin 16 output 100 180 360 mVrms VOAM(2) 80dBμ, 30% mod. The pin 16 output 200 320 500 mVrms S/NAM(1) 23dBμ, 30% mod. The pin 16 output 18 22 dB S/NAM(2) 80dBμ, 30% mod. The pin 16 output 49 55 dB Total harmonic distortion (mono) THDAM(1) 80dBμ, 30% mod. The pin 16 output THDAM(2) 80dBμ, 80% mod. The pin 16 output LED sensitivity SDOn-AM Local oscillator buffer output VOSC-AM IF counter buffer output ST-IF output S-merer output 0.4 1.2 % 1.0 4.0 % 17 27 37 dBμ With no input. The pin 30 output 110 160 220 mVrms VIFBuff-AM 80dBμ, no modulation. The pin 13 output 160 220 300 mVrms VSTIF-AM 80dBμ, no modulation. The pin 7 output 16 34 48 mVrms VSM-AM 0dBμ, no modulation. 0 0 0.2 V No.5688-2/9 LA1837 Package Dimensions Allowable power dissipation, Pd max -- mW unit : mm (typ) 3196A 27.0 10.16 16 8.6 30 15 0.25 1 3.95 MAX (3.25) 3.0 0.51 MIN 0.95 (1.04) Pd max – Ta 600 550 500 400 300 200 100 0 --40 0.48 --20 0 20 40 60 80 Ambient temperature, Ta -- °C SANYO : DIP30SD(400mil) 1.78 Block Diagram OSC FM SD ADJ 30 + 29 28 AM AGC FM SD BAND-W VT RF OSC BUFF + 27 26 L.P.F + + + 25 24 23 22 21 ALC AM OSC 20 + 19 18 17 16 3 rd 5 th DECODER ANTI-BIRDIE REG BUFF AM-STEREO L/R-INPUT L R L-OUT R-OUT L.P.F AM AM MIX RF.AMP P-DET φ MUTE STEREO SW AGC AM IF SD COMP DET VCO 304kHz FF 38k FF π 19k∠ 2 FF 19k∠θ PILOT DET AM S-METER FM AM / FM S-METER S-CURVE IF-BUFF STEREO DRIVE VCC + 6 7 8 9 + 10 11 12 13 14 15 FM + MUTE FM IFT FM IN (10.7MHz) 5 AM/FM IF-BUFF 4 FM VSM AM VSM (SD-ADJ) 3 ST-LED 2 TU-LED 1 AM NARROW SD GND AM-IF AM IF TUNING DRIVE FM DET ST + + AM MONO VCC Top view No.5688-3/9 100 LA1837 Test Circuit 0.047μF AFC 0.047μF 30 0.01μF 29 28 27 26 25 24 23 + 3.3kΩ 10μF 3.3kΩ 10μF + 0.033μF 910pF + 22μF 33μF 3.3μF + L-OUT R-OUT L.P.F 10μF + 10kΩ 0.033μF 18kΩ 39mH 0.047μF T1 L.P.F REG OSC 20pF 5.1kΩ 1000pF 39pF OSC BUFF (1.45MHz) 50Ω AM-IN (1MHz) + 22 21 20 19 18 17 9 10 11 12 FM AM VSM V SM 13 14 16 AM 5kΩ MONO 1μF + + 5kΩ 0.47μF + STEREO FM 1μF VDD 15 3kΩ IF-BUFF T3 + SEEK1000pF 100μF NORMAL 10kΩ AM-ST T2 + 1μF 8 ST 0.047μF 5kΩ 68kΩ + 47μF 0.047μF 300Ω 7 SD 0.047μF 6 4.7kΩ 51Ω 5 68kΩ 0.047μF 4 1000pF 3 ) 75Ω 2 450kHz ( 1 FM IN (10.7MHz) 0.047μF 100Ω LA1837 VCC 9.0V 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 VCC Connect the mixer coil between this pin and VCC. 3 FM IF input bypass Vreg Also functions as the MPX regulator filter. 4 AM IF input Vreg Input impedance ri = 2kΩ 2 See pin 1. 4 5 GND 6 TU-LED VCC 0V Active low 7 ST-LED VCC Open collector output AM-IF output 6 7 AM stereo IF output (pin 7) The current input must not exceed 150μA. 8 VCC VCC 9 FM detector VCC Recommended detector coil : 600BEAS-9715Z (The Toko Electric Corporation) 9 10 AM narrow band CF connection 1.3V Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.) If the narrow band SD is not used, bypass this circuit 10 with a 50Ω resistor and a 0.047μF capacitor connected in series. Continued on next page. No.5688-4/9 LA1837 Continued from preceding page. Pin No. 11 Pin function FM-S-meter output Pin voltage (V) 0V Pin description Equivalent circuit RL = 8kΩ 11 12 AM S-meter output 0V (AM) The AM SD sensitivity is adjusted with the value of AM SD sensitivity the external resistor connected between this pin and adjustment ground. 12 28 13 14 AM and FM IF buffer 0V V13 ≤ 0.5 V : Reception state output, 1.4 V ≤ V13 ≤ 2.2 V : IF buffer output turned on output control switch V13 ≥ 3.5 V : IF buffer output and muting are turned (mute switch) on Phase comparator low-pass filter VCC-1.4 (FM) 0V (AM) (FM/AM switching) 13 Connecting this pin to ground through a resistor sets the IC to AM mode. Resistor value limits : 14 2.7kΩ (when VCC = 7V) 3.9kΩ (8V) 5.1kΩ (9V) 6.2kΩ (10V) 7.5kΩ (11V) 15 Pilot detector VCC-1.0 If a current of 50μA or greater flows from this pin, the low-pass filter system is forced to mono. (forced mono) Connecting this pin to ground stops the VCO. (VCO stop) The resistor limit values are the same as for pin 14. 16 Post amplifier input Vreg 17 and output Vreg 18 Output impedance ro = 200Ω Pin 16 : right output, pin 17 : left output Inverting inputs 19 15 Pin 18 : right input, pin 19 : left input 18 19 16 17 RNF = 33kΩ 20 MOX output 21 3.5V Output impedance ro = 3.3kΩ 3.5V Pin 20 : right de-emphasis Pin 21 : left de-emphasis 22 MPX input 2.9V 20 21 Input impedance ri = 20kΩ 22 23 FM demodulator 2.8V (FM) Output impedance ro = 3.0kΩ output 2.8V (AM) The separation can be modified by inserting a 23 capacitor between this pin and ground. Set VO sub/VO main to be about 0 dB. 24 AM detector output 0V (FM) 0.5V (AM) Output impedance ro = 3.3kΩ The AM frequency characteristics can be modified by adjusting the time constants of the circuits 24 between this pin and pin 22, and between this pin and ground. 25 AM AGC 0V (FM) The built-in load resistor R = 11kΩ. 0.5V (AM) 25 Continued on next page. No.5688-5/9 LA1837 Continued from preceding page. Pin No. 26 Pin function Pin voltage (V) AFC Vreg Pin description Equivalent circuit The FM SD bandwidth can be modified with the external resistor connected between this pin and pin 28. 27 AM RF input Vreg 26 Use this pin at the same potential as pin 28. 27 28 REG Vreg Vreg = 3.6V 29 OSC Vreg Use an oscillator coil between this pin and pin 28. 30 28 Oscillator buffer 1.6V (FM) The FM SD sensitivity can be modified with the output, 1.3V (AM) external resistor connected between this pin and FM SD sensitivity ground. adjustment Output impedance ro = 20Ω 29 30 Coil specifications (bottom view) •AM oscillator (for the DUT) •IFT HW-50425 (Mitsumi Electric Co., Ltd.) YD-1073-1 (Mitsumi Electric Co., Ltd.) 3 4 3-2 2T 4-6 9T 2-1 86T Qo ≥ 80 2 1-2 3 S 4 7T 2-3 94T fo = 450kHz 2 L = 270μH 1 58T 4-6 Qo = 110 6 1 S YD-1073 Includes an internal 6 SFU450B 180pF capacitor. SFU450B included. •FM detector 600BEAS-9715Z (The Toko Electric Corporation) 3-1 3 4 22T f = 10.7MHz Qo = 40 Includes an internal 2 S 1 82pF capacitor. 6 No.5688-6/9 LA1837 Overall FM Characteristics FM THD/VSM Characteristics 5 VCC = 9V fc = 10.7MHz fm = 1kHz, 75kHzdev Out Total harmonic distortion, THD -- % S-meter output, VSM -- V 0 --10 Output -- dBm --20 --30 --40 --50 AM Out --60 --70 Noise VCC = 9V fc = 10.7MHz fm = 1kHz, 75kHzdev --80 --90 0 10 20 30 40 3 2 1 THD 0 50 60 70 80 90 100 110 120 0 10 20 30 70 80 90 100 110 120 1.0 SUB MAIN AM 1.0 7 5 3 2 O 2.0 3 2 ON 3.0 Distortion vs. Frequency Characteristics 10 7 5 0.1 7 5 M Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % FM THD Band Characteristics VIN = 100dBμ fm = 1kHz, 75kHzdev 3 2 0.01 0.01 0 10.60 10.62 10.64 10.66 10.68 10.70 10.72 10.74 10.76 10.78 10.80 2 3 5 7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 Frequency fc -- MHz Frequency, freq -- kHz Separation vs. Frequency Characteristics Adjacent Channel Interference Rejection Ratio 0 p-R Se 45 --20 35 Vobat -- dB --30 30 25 20 --40 --50 LA1837 --60 15 --70 10 --80 5 0 0.01 IF = 10.7MHz, 100dBμ, 75kHzdev VS = 90% PILOT = 10% Referenced to the L-R LA1836 demodulated output. --10 Sep-L 40 Separation, Sep -- dB 60 Input -- dBμ 4.0 50 50 40 Input -- dBμ 5.0 VSM 4 ST 10 2 3 5 7 0.1 2 3 5 7 1.0 2 3 5 7 10 --90 70 2 90 110 Frequency, freq -- kHz 6 Capture Range Characteristics 90 CR+ 4 130 150 170 190 210 230 Frequency, fs -- kHz SD Sensitivity Adjustment Characteristics 12 80 30 2 SD on -- dBμ Capture range -- % 70 0 AM FM 60 FM 50 40 30 --2 --4 AM 20 CR - 10 --6 10 20 30 Pilot -- mV 40 0 0 2 4 6 8 10 12 14 16 Rsdadj -- kΩ No.5688-7/9 LA1837 700 SD Sensitivity Adjustment Characteristics 26 Overall AM Characteristics 0 28 Out --10 600 --20 Output -- dBm SD BW -- kHz 500 400 300 --30 --40 --50 200 --60 100 --70 0 6 8 10 12 14 16 18 --80 --20 20 0 0 120 140 R 24 THD = 80%mod 1.0 --15 C = .01 0.02 7μ 2μ μ F F F 1.5 --10 --20 --25 =0 2.0 C C Output voltage, VO -- dBV V SM 2.5 --30 --35 0.5 THD = 30%mod 0 20 40 60 80 100 120 --40 0.01 140 2 3 5 7 0.1 AM Detector Output Frequency Characteristics (2) 0 22 --5 0.01μF Ω 0k R Ω R = 18kΩ 3k R=3 --20 --25 --30 --35 3 5 7 0.1 2 3 5 7 1.0 5 7 1.0 2 3 5 7 10 2 1.0 Total harmonic distortion, THD -- % 24 =1 3 Distortion vs. Ambient Temperature Characteristics R --10 2 Frequency, fm -- kHz Input -- dBμ --15 22 --5 3.0 Output voltage, VO -- dBV 100 AM Detector Output Frequency Characteristics (1) 3.5 2 80 AM THD / VSM Characteristics 4.0 --40 0.01 60 40 Input -- dBμ VCC = 9V, fc = 1MHz fm =1kHz, 30%mod S/N (80dBμ) = 58dB 0 --20 20 Radj -- kΩ .04 Total harmonic distortion, THD -- % S-meter output, VSM -- V 4.5 4 =0 5.0 2 Noise C 0 VCC = 9V fc = 1MHz fm = 1kHz, 30%mod S/N (80dBμ) = 58dB 2 3 5 7 10 2 7 5 THD sub 3 THD Mono 2 0.1 --40 THD st --20 0 20 40 THD Main 60 80 100 Ambient temperature, Ta -- °C Frequency, fm -- kHz Separation vs. Ambient Temperature Characteristics 90 S/N Mono 80 S/N Stereo Separation, Sep -- dB S/N -- dB 70 60 Sep-R 50 Sep-L 40 30 20 10 0 --40 --20 0 20 40 60 80 100 Ambient temperature, Ta -- °C No.5688-8/9 LA1837 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.5688-9/9