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| 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 : 18V 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 IF amp/limiter Guadrature limiter Guadrature det AFC/tuning meter drive AF amp Level det IF amp stop Level det Level det Level det Level det DC level Mute control Signal meter drive Mute drive Specifications Maximum Ratings at Ta=25C Parameter Maximum supply voltage Maximum input voltage Maximum supply current Maximum flow-in current Maximum flow-out current Symbol VCCmax VIN ICC I15 I16 I10 I12 I13 I15 Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg Pin 11 Pins 1-2 Pin 11 Pin 15 Pin 16 Pin 10 Pin 12 Pin 13 Pin 15 Conditions Ratings 16 1 40 1 1 2 2 2 2 650 -20 to +70 -40 to +125 Unit V Vp-p mA mA mA mA mA mA mA mA C C No.660-2/8 LA1231N Recommended Operating Conditions at Ta=25C Parameter Supply voltage Symbol VCC Conditions Ratings 12 Unit V Operating Characteristics at Ta=25C, VCC=12V, f=10.7MHz Parameter Quiescent current Current drain Demodulated output S/N Input limiting voltage Total harmonic distortion Muting sensitivity Muting attenuation Muting bandwidth AM rejection ratio Muting driving output Signal meter driving output VIN(lim) THD VIN(mute) Mute(att) Symbol ICCO ICC Vo VIN=100dB VIN=100dB, 400Hz-100% mod VIN=100dB, 400Hz-100% mod Vo 3dB down, 400Hz-100% mod VIN=100dB, 400Hz-100% mod V12=1.4V V5=2V, VIN=100dB, 400Hz-100% mod BW(mute) VIN=100dB, V12=1.4V AMR V12 V13 VIN=100dB, FM : 400Hz-100% mod AM : 1kHz-30% mod Quiescent VIN=100dB Quiescent VIN=70dB VIN=100dB AGC output IF off current Voltage of muting operation Offset voltage Pin voltage V15 I15(off) V6-10 B V7-10 B V1 V2 V3 V6 V7 V8 V10 V12 V13 V15 Quiescent VIN=100dB Quiescent, V8-1020mV Quiescent, pin 6-10 Quiescent, pin 7-10, R7-10=5.1k Quiescent Quiescent Quiescent Quiescent Quiescent Quiescent Quiescent Quiescent Quiescent Quiescent V16(mute) VIN=100dB, V12=1.4V 4.0 0 0 1.9 4.5 4.2 0 10 0.7 -0.5 -0.25 4.9 0 0 3.0 5.5 5.0 0 35 0.84 0 0 2.6 2.6 2.6 5.6 5.6 5.4 5.6 4.9 0 5.0 5.5 0.5 60 1.0 +0.5 +0.25 6.0 0.3 0.1 4.2 V V V V V V V A V V V V V V V V V V V V V 140 45 220 60 370 kHz dB 23 60 240 72 Conditions Ratings min typ 22 26.5 330 78.5 25 0.05 29 65 31 0.3 35 max 30 33 Unit mA mA dB dB % dB dB 460 mVrms No.660-3/8 LA1231N Test Circuit Pd max - Ta Allowable power dissipation, Pd max - mW Ambient temperature, Ta - C Unit (resistance : , capacitance : F) DC characteristics AC characteristics Unit (resistance : , capacitance : F) No.660-4/8 Det transformer SNY-074-1700 (Sumida's) or MV4FCC-20826EP (Toko's) Tuning meter Voltage regulator IF amp/limiter Guadrature det Guadrature limiter AFC/tuning meter drive Sample Application Circuit AF output Front end Level det Level det Level det Level det Level det DC level AF amp Mute control IF amp stop Signal meter drive Mute drive LA1231N Muting switch Mute on level adj. Signal meter No.660-5/8 An Example of Printed Pattern Board (70x95mm2, bottom view) Unit (resistance : , capacitance : F) LA1231N Pin Voltage - VIN Demodulated output, VO Distortion, THD AM rejection ratio, AMR Output noise voltage, VNO - dB IF input voltage, VIN - dB V7-10 - f Pin voltage, V12, V13, V15 - V IF input voltage, VIN - dB V12 - f Pin voltage, V7-10 - V Detuning frequency, f - kHz Mute(att) - V5 Muting attenuation, Mute(att) - dB Pin voltage, V12 - V Detuning frequency, f - kHz Pin voltage, V12 - V Unit (resistance : , capacitance : F) Pin voltage, V5 - V Quadrature signal, V9 - mVrms Pin voltage, V16 - V Pin voltage, V12 - V Pin voltage, V16 - V Resistance between pin and ground, R16-G - No.660-6/8 Pin voltage, V10, V12 - V Demodulated output, VO - mVrms Limiting voltage, VIN(lim) - dB IF amp stop current, I15(IF off) - A I15(IF off) - VIN Generator resistance, Rg - IF input voltage, VIN - dB VIN(lim) - Rg Ambient temperature, Ta - C Current drain, ICC - mA Muting sensitivity, VIN(mute) - dB Input limiting voltage, VIN(lim) - dB Resistance between pin7-10 - k VIN(mute), VIN(lim) - Ta Ambient temperature, Ta - C Ambient temperature, Ta - C Pin voltage, V15(IF off) - V Muting bandwidth, BW(mute) - kHz LA1231N Pin voltage, V13 - V Ambient temperature, Ta - C Ambient temperature, Ta - C No.660-7/8 LA1231N Muting attenuation, Mute(att) - dB Pin voltage, V15 - V Ambient temperature, Ta - C Ambient temperature, Ta - C Muting bandwidth, BW(mute) - kHz Ambient temperature, Ta - C Current drain, ICC - mA Supply voltage, VCC - V Detuning - kHz 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 |
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