A1231N

LA1231N SANYO | Alldatasheet

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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 Package Dimensions unit: mm 3006B-DIP16 [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 voltage- inverting 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. • Quadrature detection.
• AF preamplifier. • Muting at weak.
• Muting at the detuning. • Signal meter drive output.
• AFC tuning meter drive output. • Delay AGC output.
• Inverting circuit for muting drive voltage. • IF amplifier stop circuit. Overview Being developed for FM IF System, LA1231 is a highly integrated circuit in which almost all functions are 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 6- stage 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

No.660-2/8 Specifications Maximum Ratings at Ta=25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max Pin 11 16 V Maximum input voltage VIN Pins 1-2 ±1 Vp-p Maximum supply current ICC Pin 11 40 mA Maximum flow-in current I15 Pin 15 1 mA I16 Pin 16 1 mA Maximum flow-out current 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 Voltage regulator IF amp/limiter Guadrature limiter AFC/tuning meter drive Guadrature det Level det IF amp stop Signal meter drive Mute drive Level det Level det Level det Level det DC level AF amp Mute control

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

No.660-3/8 Recommended Operating Conditions at Ta=25°C Parameter Symbol Conditions Ratings Unit Supply voltage VCC 12 V Operating Characteristics at Ta=25°C, VCC =12V, f=10.7MHz Parameter Symbol Conditions Ratings min typ max Unit Quiescent current ICCO 22 30 mA Current drain ICC VIN=100dBµ 26.5 33 mA Demodulated output Vo VIN=100dBµ, 400Hz-100% mod 240 330 460 mVrms S/N VIN=100dBµ, 400Hz-100% mod 72 78.5 dB Input limiting voltage VIN(lim) Vo 3dB down, 400Hz-100% mod 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 dB 400Hz-100% mod Muting bandwidth BW(mute) VIN=100dBµ, V12=1.4V 140 220 370 kHz AM rejection ratio AMR VIN=100dBµ, FM : 400Hz-100% mod 45 60 dB AM : 1kHz-30% mod Muting driving output V12 Quiescent 4.0 4.9 6.0 V VIN=100dBµ 0 0 0.3 V Signal meter driving outputV13 Quiescent 0 0 0.1 V VIN=70dB µ 1.9 3.0 4.2 V VIN=100dBµ 4.5 5.5 V AGC output V15 Quiescent 4.2 5.0 5.5 V VIN=100dBµ 0 0 0.5 V IF off current I15(off) Quiescent, V8-10≤20mV 10 35 60 µA Voltage of muting operationV16(mute) VIN=100dBµ, V12=1.4V 0.7 0.84 1.0 V Offset voltage V6-10 B Quiescent, pin 6-10 –0.5 0 +0.5 V V7-10 B Quiescent, pin 7-10, R7-10=5.1kΩ –0.25 0 +0.25 V Pin voltage 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

No.660-4/8 Test Circuit Unit (resistance : Ω , capacitance : F) Unit (resistance : Ω , capacitance : F) DC characteristics AC characteristics Pd max – Ta Ambient temperature, Ta – °C Allowable power dissipation, Pd max – mW

No.660-5/8 Sample Application Circuit Det transformer SNY-074-1700 (Sumida's) or MV4FCC-20826EP (Toko's) Unit (resistance : Ω , capacitance : F) An Example of Printed Pattern Board (70·95mm 2, bottom view) Tuning meter Muting switch Signal meter Mute on level adj. AF output Voltage regulator IF amp/limiter Guadrature limiter AFC/tuning meter drive Guadrature det Level det Front end IF amp stop Signal meter drive Mute drive Level det Level det Level det Level det DC level AF amp Mute control

No.660-6/8 Unit (resistance : Ω , capacitance : µF) IF input voltage, VIN – dBµ IF input voltage, VIN – dBµ Pin Voltage – VIN Pin voltage, V12, V13, V15 – V Demodulated output, VO Distortion, THD AM rejection ratio, AMR Output noise voltage, VNO – dB Detuning frequency, ∆f – kHz V7-10 – ∆f Pin voltage, V7-10 – V Pin voltage, V5 – V Mute(att) – V5 Muting attenuation, Mute(att) – dB Pin voltage, V16 – V Pin voltage, V16 – V Resistance between pin and ground, R16-G – Ω Pin voltage, V12 – V Quadrature signal, V9 – mVrms Pin voltage, V12 – V Detuning frequency, ∆f – kHz V12 – ∆f Pin voltage, V12 – V

No.660-7/8 IF input voltage, VIN – dBµ I15(IF off) – VIN IF amp stop current, I15(IF off) – A Generator resistance, Rg – Ω VIN(lim) – Rg Limiting voltage, VIN(lim) – dBµ Ambient temperature, Ta – °C Demodulated output, VO – mVrms Ambient temperature, Ta – °C Pin voltage, V10, V12 – V Ambient temperature, Ta – °C Pin voltage, V13 – V Ambient temperature, Ta – °C Current drain, ICC – mA Ambient temperature, Ta – °C VIN(mute), VIN(lim) – Ta Muting sensitivity, VIN(mute) – dBµ Input limiting voltage, VIN(lim) – dBµ Resistance between pin7-10 – kΩ Muting bandwidth, BW(mute) – kHz Pin voltage, V15(IF off) – V

No.660-8/8 N o products described or contained herein are intended for use in surgical im plants, life-support system s, aerospace equipm ent, nuclear pow er control system s, vehicles, disaster/crim e-prevention equipm ent and the like, the failure of w hich m ay directly or indirectly cause injury, death or property lose. Anyone purchasing any products described or contained herein for an above-m entioned use shall: Accept full responsibility and indem nify and defend SAN YO ELEC TR IC C O ., LTD ., its affiliates, subsidiaries and distributors and all their officers and em ployees, jointly and severally, against any and all claim s and litigation and all dam ages, cost and expenses associated w ith such use: N ot im pose any responsibilty for any fault or negligence w hich m ay be cited in any such claim or litigation on SAN YO ELEC TR IC C O ., LTD ., its affiliates, subsidiaries and distributors or any of their officers and em ployees jointly or severally. Inform ation (including circuit diagram s and circuit param eters) herein is for exam ple only; it is not guarant- eed for volum e production. SAN YO believes inform ation herein is accurate and reliable, but no guarantees are m ade or im plied regarding its use or any infringem ents of intellectual property rights or other rights of third parties. This catalog provides inform ation as of O ctober, 1997. Specifications and inform ation herein are subject to change w ithout notice. Ambient temperature, Ta – °C Pin voltage, V15 – V Ambient temperature, Ta – °C Muting bandwidth, BW(mute) – kHz Supply voltage, VCC – V Current drain, ICC – mA Ambient temperature, Ta – °C Muting attenuation, Mute(att) – dB Supply voltage, VCC – V Detuning – kHz