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| Ordering number : ENN*7931 LA1845NV Monolithic Linear IC Single-Chip Home Stereo IC The LA1845NV is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning functions using SD/IF-count technique. It incorporates a pilot canceler and an adjustment-free MUX VCO circuit, thus allows additional parts to be reduced. Functions * AM : RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, SD, oscillator buffer, IF buffer, stereo IF output, AGC time constant switch * FM IF : IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output * MPX : PLL stereo decoder, stereo display, forced monaural, VCO stop, audio muting, adjacent channel interference rejection function, pilot canceler 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. Maximum Ratings at Ta = 25C Parameter Maximum Power Supply Voltage Allowable Power Consumption Symbol VCC max Pd max Ta = 80C with board 114.3mmx76.1mmx1.6mm material : Glass epoxy resin Operating Temperature Storage Temperature Topr Tstg -20 to +80 -40 to +125 C C 360 mW Conditions Ratings 6 Unit V Operating Conditions at Ta = 25C Parameter Recommended Supply Voltage Operating Supply Voltage Range Symbol VCC VCC op Ta = 80C Conditions Ratings 5 4.3 to 5.5 Unit V V 91004 JO IM No.7931-1/10 LA1845NV Electrical Characteristics * Operating Characteristics at VCC = 8V, in the specified test circuit. FM Mono Characteristics at fc = 10.7MHz, Vi = 100dB, fm = 1kHz, Modulation = 75kHz Parameter Current Drain Demodulator Output Total Harmonic Distortion Signal-to-Noise Ratio AM Rejection Ratio 3dB Sensitivity SD Sensitivity IF Counter Buffer Output Mute Attenuation With no input signal 100dB, 100% modulation, fm = 1kHz 100dB, 100% modulation, fm = 1kHz 100dB, 100% modulation, fm = 1kHz 100dB, AM = 30% modulation, fm = 1kHz 100dB, 100% modulation, fm = 1kHz Output reference, -3dB input 0% modulation 100dB 100dB, 100% modulation, fm = 1kHz 38 200 73 47 Conditions Ratings min 20 230 typ 30 360 0.35 80 65 32 47 275 76 40 56 400 max 40 460 1.5 Unit mA mVrms % dB dB dB dB mVrms dB FM Stereo Characteristics at fc = 10.7MHz, Vi = 100dB, L+R = 90%, Pilot = 10%, fm = 1kHz Parameter Separation Stereo On Level Total Harmonic Distortion Adjacent Channel Rejection Ratio 1 Adjacent Channel Rejection Ratio 2 Carrier Leak Conditions L+R = 90%, Pilot = 10%, fm = 1kHz Pilot input Pilot input fs = 113kHz, VS = 90%, Pilot = 10% ; The left-right modulation, demodulated output fs = 189kHz, VS = 90%, Pilot = 10% ; The left-right modulation, demodulated output L+R = 90%, Pilot = 10% reference, Pilot = 10% output 38 Ratings min 30 1.5 typ 42 3.5 0.45 36 41 44 5.5 1.5 max Unit dB % % dB dB dB AM Characteristics at fc = 1000kHz, Vi = 80dB, fm = 1kHz, Modulation = 30% Parameter Current Drain Detector Output 1 Detector Output 2 Signal-to-Noise Ratio 1 Signal-to-Noise Ratio 2 Total Harmonic Distortion 1 Total Harmonic Distortion 2 SD Sensitivity Local Oscillator Buffer Output IF Counter Buffer Output With no input signal 23dB, 30% modulation, fm = 1kHz 80dB, 30% modulation, fm = 1kHz 23dB, 30% modulation, fm = 1kHz 80dB, 30% modulation, fm = 1kHz 80dB, 30% modulation, fm = 1kHz 107dB, 30% modulation, fm = 1kHz 0% modulation With no input signal 23dB 11 100 140 Conditions Ratings min 13 40 90 17 46 typ 27 80 160 23 52 0.4 0.5 20 140 285 1.1 1.3 29 200 400 max 39 160 230 Unit mA mVrms mVrms dB dB % % dB mVrms mVrms No.7931-2/10 LA1845NV Package Dimensions unit : mm 3175B Pin Description Pin No. 1 Pin function FM IF input Pin voltage Vreg Equivalent circuit Notes Input impedance ri = 330 1 3 2 AM mixer output VCC Connect the mixer coil between this pin and VCC 2 3 REG 2.1 3 Vreg = 2.1V 4 AM IF input Vreg Input impedance ri = 2k 4 5 6 7 GND Tu-LED ST-LED/AF-IF output 0V VCC Active low 6 7 Open collector 8 9 FM detector VCC VCC The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is recommended for detector coil. Continued on next page. No.7931-3/10 LA1845NV Continued from preceding page. Pin No. 10 Pin function AM/FM IF counter output, output control switch, mute switch Pin voltage 0V Equivalent circuit Notes V100.5V : Reception state 1.4VV102.2V : Muting on V103.5V : IF counter output and muting on 10 11 Phase comparator low-pass filter (AM/FM switching) VCC-1.0 11 The device operates in AM mode when a current of over 200A flows from pin. 12. 12 Pilot detector lowpass filter (Forced mono) (VCO stop) VCC-1.0 12 The device is forced to monaural when a current of over 50A flows from this pin. The VCO is stopped when a current of over 200A flows from this pin. The limit values for the resistor are the same as those for pin 11. 13 14 L outputs R outputs 3.2V Output impedance ro = 3.3k 13 ( 15 Pilot canceler output Vreg 14 ) 15 3 16 Decoder input Vreg RNF Inverting input pin RNF = 20k 16 17 PLL input Vreg Input impedance ri = 20k 17 18 FM demodulator output Vreg+0.7 18 Output impedance ro = 2.3k The channel separation can be adjusted with an external capacitor connected between this pin and ground. Continued on next page. No.7931-4/10 LA1845NV Continued from preceding page. Pin No. 19 Pin function AM detector output Pin voltage 0V (FM) 1.5V (AM) Equivalent circuit Notes Output impedance ro = 3.3k 19 20 S meter, AM AGC 0.2V (FM) 0.9V (AM) The resistance of the built-in resistor R is 13.9k. The SD response during seek operation is determined with the external capacitor connected to this pin. 20 R 21 AM RF input Vreg 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 23 OSC VCC 23 Connect the oscillator coil between this pin and pin 9 (VCC). Note : Impedance of the secondary oscillator coil must be 5k or higher. 24 Oscillator buffer output, FM SD sensitivity adjustment VCC-1.4 The FM SD sensitivity can be adjusted with an external resistor connected to this pin. R 24 Output impedance R = 200 Note : Resistance of the external resistor connected to the pin 24 must be 3.3k or higher. No.7931-5/10 LA1845NV Equivalent Circuit Block Diagram No.7931-6/10 Test Circuit AM-IN (1MHz) 50 A 0.047F 39MH 1000pF A 20k 0.0047F 0.015F 15 14 13 0.015F 65k 20k 18 17 16 0.1F 22F 0.01F 22 21 20 19 10F 3.3F 4.7F 0dB LPF LPF 0.047F LOUT OSC BUFF 39pF 20pF ROUT 1000pF 5.6k HW50425 6.8k 24 23 LA1845NV LA1845NV 1 3 4 6 7 8 ST-LED V-ST 50k 1000pF AM IF TU-LED V-SD HW6215 50k 5 2 FM-IN (10.7MHz) 9 10 11 1F 3k 10k 1000pF NORMAL AM/FM IF-BUFF 20pF SEEK 0.47F 12 300 1F 75 0.047F FM AM MONO VCC 5.0V 600BEAS-10471 Detector coil Discriminator 33F 0.047F Top view No.7931-7/10 LA1845NV No.7931-8/10 LA1845NV No.7931-9/10 LA1845NV PS No.7931-10/10 |
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