Ordering number : EN660A Monolithic Linear IC LA1231N FM IF System Overview Package Dimensions Being developed for FM IF System, LA1231 is a highly unit: mm integrated circuit in which almost all functions are 3006B-DIP16 contained concerning the FM tuner IF stage. The block diagram of equivalent circuit is shown below. Usual peripheral circuits are shown also in examples of application circuits. The IF amplifier and limiter stages are composed of 6stage double-end type differential amplifier, which is superior on its AMR. The signal meter driving stage which is located in parallel therewith consists of a 3-stage level detector circuit and a drive circuit in order to extend the linear area. The FM detection stage composed of a double-balance type [LA1231N] SANYO: DIP16 quadrature detecting circuit is attached with a low frequency preamplifier and muting control circuit. The muting drive stage is composed of the following 3 circuits. 1) A level detection circuit which detects the S/N ratio of carrier wave when the input is weak. 2) A circuit which detects the dc output of FM detector's 'S' curve when detuning is made. 3) A driving circuit. Thus, this muting driving stage can reduce foreign factors such as the interstation noises, the shock noise caused from muting when detuning is made, and so forth. Besides, a voltage-inverting circuit is built in LA1231N so that the muting may be enabled at any appropriate input signal level. The output of this voltage-inverting circuit is connected with the muting drive output terminal. Thus, the muting can be placed to the ON or OFF status when a control voltage is applied from other section to the input terminal of the voltageinverting circuit. For the control voltage, the output of the signal meter driver is appropriate. Both the AFC output stage and tuning meter driving stage are of the current-driven type. So, not only the sensitivity of AGC but also the muting band (when detuning is made) can be controlled by an outer resistor. Being utilized for disabling the FM IF amplifier when AM reception is made, the IF amplification/stop circuit can decrease the shock noise caused at the conversion between FM and AM reception modes. Functions • IF amplification, Limiter. • AF preamplifier. • Muting at the detuning. • AFC tuning meter drive output. • Inverting circuit for muting drive voltage. • Quadrature detection. • Muting at weak. • Signal meter drive output. • Delay AGC output. • IF amplifier stop circuit. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN O2097HA (KT)/8044/D040KI No.660-1/8 LA1231N Features • High sensitivity on limiting : 18µV typ. • Low distortion : 0.05% typ. determined by the linearity of phase characteristics in phase shifting circuit. • High demodulation output : 330 mVrms typ. • High S/N ratio : 78.5dB typ. • Muting at detuning with little shock noise. • Single meter drive output proportional with the input signal level dB. • Detuning muting band having good symmetrics. • Tuning meter driving output having wide swing width. • Delay AGC drive output for front end. • Constant voltage circuit is built-in : operation voltage=9 to 14V. • Muting characteristics between adjacent stations are distinguished. Equivalent Circuit Block Diagram Voltage regulator Guadrature limiter IF amp/limiter AFC/tuning meter drive Guadrature det AF amp Level det Level det IF amp stop Level det Signal meter drive Level det Level det DC level Mute control Mute drive Specifications Maximum Ratings at Ta=25°C Parameter Symbol Conditions VCCmax Pin 11 Maximum input voltage VIN Maximum supply current ICC Maximum supply voltage Maximum flow-in current Maximum flow-out current Ratings Unit 16 V Pins 1-2 ±1 Vp-p Pin 11 40 mA I15 Pin 15 1 mA I16 Pin 16 1 mA I10 Pin 10 2 mA I12 Pin 12 2 mA I13 Pin 13 2 mA I15 Pin 15 2 mA Allowable power dissipation Pd max 650 mA Operating temperature Topr –20 to +70 °C Storage temperature Tstg –40 to +125 °C No.660-2/8 LA1231N Recommended Operating Conditions at Ta=25°C Parameter Supply voltage Symbol Conditions Ratings Unit 12 VCC V Operating Characteristics at Ta=25°C, VCC=12V, f=10.7MHz Parameter Quiescent current Symbol Conditions Ratings min ICCO max 22 30 mA 33 mA Current drain ICC VIN=100dBµ Demodulated output Vo VIN=100dBµ, 400Hz-100% mod 240 330 VIN=100dBµ, 400Hz-100% mod 72 78.5 VIN(lim) Vo 3dB down, 400Hz-100% mod S/N Input limiting voltage Unit typ 26.5 460 mVrms dB 25 31 dBµ Total harmonic distortion THD VIN=100dBµ, 400Hz-100% mod 0.05 0.3 % Muting sensitivity VIN(mute) V12=1.4V 23 29 35 dBµ Muting attenuation Mute(att) V5=2V, VIN=100dBµ, 60 65 140 220 45 60 4.0 4.9 6.0 V dB 400Hz-100% mod Muting bandwidth BW(mute) VIN=100dBµ, V12=1.4V AM rejection ratio AMR VIN=100dBµ, FM : 400Hz-100% mod 370 kHz Muting driving output V12 Quiescent VIN=100dBµ 0 0 0.3 V Signal meter driving output V13 Quiescent 0 0 0.1 V 4.2 dB AM : 1kHz-30% mod AGC output V15 VIN=70dBµ 1.9 3.0 VIN=100dBµ 4.5 5.5 Quiescent 4.2 5.0 5.5 V 0 0 0.5 V VIN=100dBµ V V IF off current I15(off) Quiescent, V8-10≤20mV 10 35 60 µA Voltage of muting operation V16(mute) VIN=100dBµ, V12=1.4V 0.7 0.84 1.0 V Offset voltage V6-10 B Quiescent, pin 6-10 V7-10 B Quiescent, pin 7-10, R7-10=5.1kΩ V1 Quiescent 2.6 V V2 Quiescent 2.6 V V3 Quiescent 2.6 V V6 Quiescent 5.6 V V7 Quiescent 5.6 V V8 Quiescent 5.4 V V10 Quiescent 5.6 V V12 Quiescent 4.9 V V13 Quiescent 0 V V15 Quiescent 5.0 V Pin voltage –0.5 0 +0.5 V –0.25 0 +0.25 V No.660-3/8 LA1231N Test Circuit Allowable power dissipation, Pd max – mW Pd max – Ta Ambient temperature, Ta – °C Unit (resistance : Ω, capacitance : F) DC characteristics AC characteristics Unit (resistance : Ω, capacitance : F) No.660-4/8 An Example of Printed Pattern Board (70×95mm2, bottom view) Front end IF amp stop Level det Level det Signal meter Mute drive Level det DC level Guadrature det Muting switch Mute control AF amp AFC/tuning meter drive Unit (resistance : Ω, capacitance : F) Level det Guadrature limiter Mute on level adj. Signal meter drive Level det IF amp/limiter Voltage regulator AF output Tuning meter Det transformer SNY-074-1700 (Sumida's) or MV4FCC-20826EP (Toko's) LA1231N Sample Application Circuit No.660-5/8 LA1231N Pin voltage, V12, V13, V15 – V Demodulated output, VO Distortion, THD AM rejection ratio, AMR Output noise voltage, VNO – dB Pin Voltage – VIN IF input voltage, VIN – dBµ IF input voltage, VIN – dBµ V12 – ∆f Pin voltage, V12 – V Pin voltage, V7-10 – V V7-10 – ∆f Detuning frequency, ∆f – kHz Detuning frequency, ∆f – kHz Pin voltage, V12 – V Muting attenuation, Mute(att) – dB Mute(att) – V5 Quadrature signal, V9 – mVrms Pin voltage, V12 – V Pin voltage, V16 – V Pin voltage, V5 – V Unit (resistance : Ω, capacitance : µF) Pin voltage, V16 – V Resistance between pin and ground, R16-G – Ω No.660-6/8 Pin voltage, V13 – V Pin voltage, V10, V12 – V Current drain, ICC – mA Demodulated output, VO – mVrms Muting sensitivity, VIN(mute) – dBµ Input limiting voltage, VIN(lim) – dBµ Limiting voltage, VIN(lim) – dBµ Ambient temperature, Ta – °C Muting bandwidth, BW(mute) – kHz Pin voltage, V15(IF off) – V IF amp stop current, I15(IF off) – A LA1231N I15(IF off) – VIN IF input voltage, VIN – dBµ VIN(lim) – Rg Resistance between pin7-10 – kΩ VIN(mute), VIN(lim) – Ta Generator resistance, Rg – Ω Ambient temperature, Ta – °C Ambient temperature, Ta – °C Ambient temperature, Ta – °C Ambient temperature, Ta – °C No.660-7/8 Pin voltage, V15 – V Muting attenuation, Mute(att) – dB LA1231N Ambient temperature, Ta – °C Current drain, ICC – mA Muting bandwidth, BW(mute) – kHz Ambient temperature, Ta – °C Supply voltage, VCC – V Detuning – kHz Ambient temperature, Ta – °C Supply voltage, VCC – V 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 lose. 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 October, 1997. Specifications and information herein are subject to change without notice. No.660-8/8