Ordering number : ENN6039 Monolithic Linear IC LA1784M Single-Chip Tuner IC for Car Radios The LA1784M integrates all six blocks required in a car radio tuner on a single chip. Functions • FM front end • FM IF • Noise canceller • Multiplex • AM up-conversion • FM/AM switch • MRC Features Package Dimensions Unit:mm 3159-QIP64E [LA1784M] 0.8 1.0 17.2 14.0 0.35 1.6 1.0 0.15 33 48 32 49 17 64 1 16 15.6 3.0max Independent IC 0.8 Mounted on a 40 × 80 × 1.3 mm3 glass epoxy printed circuit board 1.0 Allowable power dissipation, Pdmax — mW 17.2 14.0 • Improved noise reduction methods — The FM front end provides excellent 3-signal characteristics equivalent to those of the LA1193M. — Superlative listenability due to improved medium and weak field noise canceller characteristics. — Improved separation characteristics — Anti-birdie filter — Improved AM and FM thermal characteristics — Excellent FM signal meter linearity — Modified N.C. circuit for improved noise rejection • Double conversion AM tuner (up conversion) Reduces the number of external components required as compared to earlier double conversion tuners, in particular, no crystal is required (when used in conjunction with the LC72144). • Sample-to-sample variation reduction circuit built into the FM IF circuit. (Fixed resistors are used for the SD, keyed AGC, mute on adjustment, ATT, SNC, and HCC functions.) • The LA1784 inherits the block arrangement of the LA1780M and supports pin-compatible designs. 1.6 1.0 Overview 0.1 2.7 0.8 SANYO: QIP64E Ambient temperature, Ta — °C Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO 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 products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 61501TN (OT) No. 6039-1/50 LA1784M Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage Allowable power dissipation Conditions VCC1 max Pins 6, 40, and 61 VCC2 max Pins 7, 45, 54, 59, and 60 Pd max Ratings Unit 9 Ta ≤ 55°C V 12 V 950 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –40 to +150 °C Operating Conditions at Ta = 25°C Parameter Symbol VCC Recommended supply voltage VCCST IND Operating supply voltage range Conditions Ratings Unit Pins 6, 7, 40, 45, 54, 59, 60, and 61 8 V Pin 26 5 V 7.5 to 9.0 V VCC op Operating Characteristics at Ta = 25°C, VCC= 8.0V, in the specified test cricuit for the FM IF input Ratings Parameter Symbol Conditions min typ max unit [FM Characteristics] At the FM IF input Current drain Demodulation output Pin 31 demodulation output Channel balance Total harmonic distortion ICCO-FM VO-FM VO-FM31 CB No input, I40 + I45 + I54 + I59 + I60 + I61 60 94 110 mA 10.7 MHz, 100dBµ, 1 kHz, 100%mod, The pin 15 output 205 310 415 mVrms 10.7 MHz, 100dBµ, 1 kHz, 100%mod, The pin 31 output 190 295 380 mVrms The ratio between pins 15 and 16 at 10.7 MHz, 100 dBµ, 1 kHz –1 0 +1 dB 0.3 1 THD-FM mono 10.7 MHz, 100 dBµ, 1 kHz, 100% mod, pin 15 Signal-to-noise ratio: IF S/N-FM IF 10.7 MHz, 100 dBµ, 1 kHz, 100% mod, pin 15 75 82 dB AM suppression ratio: IF AMR IF 10.7 MHz, 100 dBµ, 1 kHz, fm = 1 kHz, 30% AM, pin 15 55 68 dB Att-1 10.7 MHz, 100 dBµ, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V 5 10 15 dB Att-2 10.7 MHz, 100 dBµ, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V*1 15 20 25 dB Att-3 10.7 MHz, 100 dBµ, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V*2 28 33 38 dB 10.7 MHz, 100 dBµ, L+R = 90%, pilot = 10%. The pin 15 output ratio 30 40 Muting attenuation Separation Separation Stereo on level ST-ON The pilot modulation such that V26 < 0.5 V 2.1 4.1 Stereo off level ST-OFF The pilot modulation such that V26 > 3.5 V 1.2 3.1 Main total harmonic distortion THD-Main L 10.7 MHz, 100 dBµ, L+R = 90%, pilot = 10%. The pin 15 signal Pilot cancellation PCAN 10.7 MHz, 100 dBµ, pilot = 10%. The pin 15 signal/the pilot level leakage. DIN audio SNC output attenuation AttSNC 10.7 MHz, 100 dBµ, L-R = 90%, pilot = 10%. V28 = 3 V → 0.6 V, pin 15 % dB 6.5 % % 0.3 1.2 % 20 30 dB 1 5 9 dB 0.5 4.5 8.5 dB AttHCC-1 10.7 MHz, 100 dBµ, 10 kHz, L+R = 90%, pilot = 10%. V29 = 3 V → 0.6 V, pin 15 AttHCC-2 10.7 MHz, 100 dBµ, 10 kHz, L+R = 90%, pilot = 10%. V29 = 3 V → 0.1 V, pin 15 6 10 14 dB 100 dBµ, 10.7 MHz, 30% modulation. The IF input such that the input reference output goes down by 3 dB 33 40 47 dBµ The IF input level (unmodulated) when V33 = 2 V 27 35 43 dBµ The IF input level (unmodulated) (over 100 mV rms) such that the IF counter buffer output goes on 54 62 70 dBµ 54 62 70 dBµ VIFBUFF-FM 10.7 MHz, 100 dBµ, unmodulated. The pin 23 output 130 200 270 mVrms VSM FM-1 No input. The pin 24 DC output, unmodulated 0.0 0.1 0.3 V VSM FM-2 50 dBµ. The pin 24 DC output, unmodulated 0.4 1.0 1.5 V VSM FM-3 70 dBµ. The pin 24 DC output, unmodulated 2.0 2.7 3.5 V VSM FM-4 100 dBµ. The pin 24 DC output, unmodulated 4.7 5.5 6.2 V Muting bandwidth BW-mute 100 dBµ. The bandwidth when V33 = 2 V, unmodulated 150 220 290 kHz Mute drive output VMUTE-100 100 dBµ, 0 dBµ. The pin 33 DC output, unmodulated 0.00 0.03 0.20 V HCC output attenuation Input limiting voltage Muting sensitivity SD sensitivity Vi-lim Vi-mute SD-sen1 FM SD-sen2 FM IF counter buffer output Signal meter output Continued on next page. No. 6039-2/50 LA1784M Continued from preceding page. Ratings Parameter Symbol Conditions min typ max unit [FM FE Mixer Input N-AGC on input VN-AGC 83 MHz, unmodulated. The input such that the pin 2 voltage is 2.0 V or below 81 88 95 dBµ W-AGC on input VWAGC 83 MHz, unmodulated. The input such that the pin 2 voltage is 2.0 V or below. (When the keyed AGC is set to 4.0 V.) 104 110 116 dBµ 83 MHz, 80 dBµ, unmodulated. The FE CF output 19 30 48 mVrms No input 85 110 165 mVrms Conversion gain Oscillator buffer output A.V VOSCBUFFFM [NC Block] NC input (pin 30) Gate time τGATE1 Noise sensitivity NC effect SN SN-NC f = 1 kHz, for a 1-µs, 100-mV p-o pulse 55 µs The level of a 1 = kHz, 1-µs pulse input that starts noise canceller operation. Measured at pin 30. 40 mVp-o The pulse rejection effect provided by the noise canceller. For a repeated 1-µs wide pulse, frequency = 10 kHz, 150 mV p-o. The ratio of the FM mode pin 15 output referenced to the AM mode pin 15 output (effective value) 5 [Multipath Rejection Circuit] MRC input (pin 27) MRC output MRC operating level VMRC MRC-ON V24 = 5 V 2.2 2.3 2.4 V The pin 32 input level at f = 70 kHz such that pin 24 goes to 5 V and pin 27 goes to 2 V 10 15 20 mVrms [AM Characteristics] AM ANT input Practical sensitivity S/N-30 1 MHz, 30 dBµ, fm = 1 kHz, 30% modulation, pin 15 20 Detector output VO-AM 1 MHz, 74 dBµ, fm = 1 kHz, 30% modulation, pin 15 130 195 270 mVrms VO-AM31 1 MHz, 74 dBµ, fm = 1 kHz, 30% modulation, pin 31 110 175 230 mVms VAGC-FOM 1 MHz, 74 dBµ, referenced to the output, the input amplitude such that the output falls by 10 dB. Pin 15 59 64 69 dB 47 Pin 31 detector output AGC F.O.M. Signal-to-noise ratio S/N-AM 1 MHz, 74 dBµ, fm = 1 kHz, 30% modulation Total harmonic distortion THD-AM 1 MHz, 74 dBµ, fm = 1 kHz, 80% modulation Signal meter output Oscillator buffer output Wide band AGC sensitivity SD sensitivity IF buffer output dB 52 dB 0.3 1 % V VSM AM-1 No input 0.0 0.2 0.5 VSM AM-2 1 MHz, 130 dBµ, unmodulated 3.5 4.4 6.1 No input, the pin 15 output 185 230 VOSCBUFF AM1 V mVrms W-AGCsen1 1.4 MHz, the input when V46 = 0.7 V 92 98 104 dBµ W-AGCsen2 1.4 MHz, the input when V46 = 0.7 V (seek mode) 83 89 95 dBµ SD-sen1 AM 1 MHz, the ANT input level such that the IF counter output turns on. 24 30 36 dBµ SD-sen2 AM 1 MHz, the ANT input level such that the SD pin goes to the on state. 24 30 36 1 MHz, 74 dBµ, unmodulated. The pin 23 output 200 290 VIFBUFF-AM dBµ mVrms Note: These measurements must be made using the either the IC-51-0644-824 or KS8277 IC socket (manufactured by Yamaichi Electronics). * 1. When the resistor between pin 58 and ground is 200 kΩ. * 2. When the resistor between pin 58 and ground is 30 kΩ. No. 6039-3/50 LA1784M Function List FM Front End (Equivalent to the Sanyo LA1193) • Double input type double balanced mixer • Pin diode drive AGC output • MOSFET second gate drive AGC output • Keyed AGC adjustment pin • Differential IF amplifier • Wide band AGC sensitivity setting pin, and narrow band AGC sensitivity setting pin • Local oscillator FM IF • IF limiter amplifier • S-meter output (also used for AM) 6-stage pickup • Multipath detection pin (shared FM signal meter) • Quadrature detection • AF preamplifier • AGC output • Band muting • Weak input muting • Soft muting adjustment pin • Muting attenuation adjustment pin • IF counter buffer output (also used for AM) • SD (IF counter buffer on level) adjustment pin • SD output (active high) (also used for AM) Noise Canceller • High-pass filter (first order) • Delay circuit based low-pass filter (fourth order) • Noise AGC • Pilot signal compensation circuit • Noise sensitivity setting pin • Function for disabling the noise canceller in AM mode Multiplex Functions • Adjustment-free VCO circuit • Level follower type pilot canceller circuit • HCC (high cut control) • Automatic stereo/mono switching • VCO oscillation stop function (AM mode) • Forced monaural • SNC (stereo noise controller) • Stereo display pin • Anti-birdie filter AM • Double balanced mixer (1st, 2nd) • IF amplifier • Detection • RF AGC (narrow/wide) • Pin diode drive pin • IF AGC • Signal meter output (also used for FM) • Local oscillator circuits (first and second) • Local oscillator buffer output • IF counter buffer output (also used by the FM IF) • SD (IF counter buffer on level) adjustment pin • SD output (active high) (also used for AM) • Wide AGC • Detection output frequency characteristics adjustment pin (low cut, high deemphasis) • AM stereo buffer MRC (multipath noise rejection circuit) AM/FM switching output (linked to the FM VCC) No. 6039-4/50 LA1784M Operating Characteristics and Symbols Used in the Test Circuit Diagrams Switches (SW) Switch on = 1, SW off = 0 There are two switches that use signal transfer. — SW2: switches between the mixer input and the IF input. — SW4: switches between noise canceler input and IF output + noise canceler input. Types of SG used PG1 (AC1) Used for noise canceler testing. A pulse generator and an AF oscillator are required. AC2 Used for FM front end testing. Outputs an 83 MHz signal. AC3 Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7 MHz signal. Stereo modulation must be possible. AC4 Used for AM testing. Outputs 1 MHz and 1.4 MHz signals. AC5 Used with the MRC. Can also be used for AF and OSC. Power supply VCC 8V VCC1 5V VCC2 0.1 V / 0.7 V / 2 V / 4 V VCC3 0.1 V / 0.6 V / 2 V SD, stereo, seek/stop These levels must be variable. Keyed AGC, Mute ATT HCC, SNC, SASC (MRC) • Switches Parameter ON SW1 AM/FM switching. The FE VCC is supplied to pin 62. SW2 FM IF switching. Pin 51/FE output SW3 For conversion gain testing SW4 For switching between noise canceler input and IF output + noise canceler. SW5 High-speed SD SW6 SEEK/STOP (IF BUFF ON/OFF) SW7 SW8 SW9 For pilot cancellation testing SW10 Mute off (pin 33) OFF FM AM FE IF OUT (A) AC3 (B) Conversion gain measurement (A) Other/purposes AC1 (A) Other/purposes High-speed SD Other/purposes STOP Seek (IF buffer output) MUTE ATT 200 kΩ MUTE 200 kΩ OFF MUTE ATT 30 kΩ MUTE 30 kΩ OFF When pilot cancellation is used When pilot cancellation is not used MUTE OFF MUTE ON • Trimmers (variable resistors) VR1 Separation adjustment VR2 Pilot cancellation adjustment Test Points • DC voltages VD1 FM RF AGC voltage Pin 2 VD2 AM/FM SD, AM Tweet, FM stereo indicator Pin 26 VD3 AM/FM S-meter Pin 24 VD4 MRC output Pin 27 VD5 Mute drive output Pin 33 VD6 AM antenna damping voltage Pin 46 VD7 N.C. Gate time Pin 8 • AC voltages VA1 AM/FM OSC Buff Pin 4 VA2 First IF output Pin 53 → CF → pin 51 load level (10.7 MHz) VA3 IF counter buffer Pin 23 (10.7 MHz/450 kHz) VA4 MPX OUT Left ch Pin 15 (AF) VA5 MPX OUT Right ch Pin 16 (AF) No. 6039-5/50 LA1784M Pin Descriptions Pin No. Function Description Equivalent circuit VCC 62 pin ANT RF AGC 1000 pF 1 Antenna damping drive An antenna damping current flows when the RF AGC voltage (pin 2) reaches VCC – VD. 300 Ω 100 Ω 1 100 Ω 1000 pF A11711 VCC FET 2ND GATE 2 RF AGC + Used to control the FET second gate. 12 kΩ 2 ANT N AGC DET DAMPING DRIVER W AGC DET VCC KEYED AGC A11712 3 F.E.GND VCC 4 OSC Oscillator connection The transistor and capacitors required for the oscillator circuit. 4 25 pF VT 2 kΩ 20 pF A11713 7 VCC 7 AM OSC AM first oscillator This circuit can oscillator up to the SW band. An ALC circuit is included. A L C A11714 Continued on next page. No. 6039-6/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit 3 kΩ 15 kΩ 3 kΩ 8 9 Noise AGC sensitivity AGC adjustment After setting up the medium field (about 50 dBµ) sensitivity with the noise sensitivity setting pin (pin 8), set the weak field (about 20 to 30 dBµ) sensitivity with the AGC adjustment pin (pin 9) 200 Ω 8 9 3 kΩ + 1 MΩ 0.01 µF 0.47 µF A11715 A11715 0.01 µF 13 11 12 Memory circuit connection 6800 pF 12 3.9 kΩ 11 VCC Recording circuit used during noise canceller operation. Differential amp Gate circuit LPF A11716 VCC 30 kΩ PLL 13 Pilot input Pin 13 is the PLL circuit input pin. N.C 12 13 0.01 µF A11717 14 N.C, MPX, MRC, GND Ground for the N.C., MPX, and MRC circuits. Continued on next page. No. 6039-7/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit VCC 15 16 MPX output (left) MPX output (right) Deemphasis 50 µs: 0.015 µF 75 µs: 0.022 µF 3.3 kΩ 3.3 kΩ 15 16 0.015 µF 0.015 µF A11718 VCC 20 kΩ 17 Pilot canceller signal output Adjustment is required since the pilot signal level varies with the sample-to-sample variations in the IF output level and other parameters. 6.7 kΩ 10 kΩ 17 18 0.01 µF 100 kΩ A11719 A11719 VCC 18 Pilot canceller signal output Pin 18 is the output pin for the pilot canceller signal. 1.5 kΩ 17 18 0.01 µF 100 kΩ A11720 Continued on next page. No. 6039-8/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit Composite signal 19 Separation adjustment pin DECODER 5 kΩ Use a trimmer to adjust the subdecoder input level. (The output level is not modified in mono and main modes.) 19 30 kΩ 0.047 µF A11721 CSB 912 JF108 20 VREF 20 VCO The oscillator frequency is 912 Hz. KBR-912F108 (Kyocera Corporation) CSB-912JF108 (Murata Mfg. Co., Ltd.) 10 pF A11722 VREF 15 kΩ PHASE COMP. PHASE COMP. + 15 kΩ 19 kΩ 21 22 + + 21 22 A11723 Continued on next page. No. 6039-9/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit 4.9 V 23 IF counter buffer seek/stop switching This pin functions both as the IF counter buffer (AC output) and as the seek/stop switch pin. The voltage V23 switches between the following three modes. During FM reception: 5 V: Seek mode 2.5 V: Forced SD mode 0 V: Reception mode AM reception (two modes: 0 and 5 V) 5 V: Seek mode 0 V: Reception mode + – 50 kΩ + – AM MUTE 1.3 V IF counter buffer VCC 10 kΩ 150 Ω + – SW 50F SD circuit 23 51 kΩ STOP IF BUFF. Forced SEEK SD: 2.5 V 5 V A11724 VCC FM S-meter 24 32 AM/FM signal meter Dedicated FM signal meter Fixed-current drive signal meter output In AM mode, pin 32 outputs a 1-mA current. Thus the HCC circuit is turned off. 32 10 kΩ AM S-meter 24 10 kΩ AM/FM SW Outputs a 1-mA current during AM reception AM/FM SW MRC A11725 26 Stereo indicator for the SD pin The voltage V23 switches between three modes as follows. FM reception: 5 V: The SD pin operates linked to the IF counter buffer. 2.5 V: Forced SD mode: operates as the SD pin. 0.7 V: Reception mode: stereo indicator AM reception: (two modes: 0 and 5 V) 5 V: Operates as the seek SD pin. 0 V: Reception mode. Not used. AM/FM SD Stereo indicator Seek/stop switching 26 100 kΩ VDD A11726 Continued on next page. No. 6039-10/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit VCC VCC C2 27 MRC control voltage time constant + 2 µA 27 The MRC detector time constant is determined by a 100 Ω resistor and C2 when discharging and by the 2-µA current and C2 when charging. 100 Ω Pin 28 A11727 VREF 28 SNC control input The sub-output is controlled by a 0 to 1-V input. 28 A11728 VREF The high band frequency output is controlled by a 0 to 1-V input. 29 HCC control input It can also be controlled by the MRC output. Use a resistor of at least 100 kΩ when controlling with the pin 32 FM S-meter signal. 32 29 1 µF + A11729 Continued on next page. No. 6039-11/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit VCC FM detector output 30 31 Noise canceller input Pin 30 is the noise canceller input. The input impedance is 50 kΩ. AM/FM detector output Pin 31 is the AM and FM detector output In FM mode, this is a lowimpedance output. In AM mode, the output impedance is 10 kΩ. To improve the low band separation, use a coupling capacitor of over 10 µF. 31 10 kΩ VCC 1 µF AM detector + 30 Noise canceller 50 kΩ 4.2 V A11730 VCC 32 32 IF S-meter output and MRC DC input FM S-meter output block MRC AC input block Adjust the external 1-kΩ resistor to attenuate the MRC AC input and control the circuit. 10 kΩ + 1 µF 1 kΩ MRC input A11731 C1 + •The muting time constant is determined by an external RC circuit as described below. Attack time: TA = 10 kΩ × C1 Release time: TR = 50 kΩ × C1 33 Mute drive output •Noise convergence adjustment The noise convergence can be adjusted when there is no input signal by inserting a resistor between pin 33 and ground. •Muting off function Ground pin 33 through a 4-kΩ resistor. 0.1 µF 33 VCC 50 kΩ MUTE AMP. SEEK OFF SOFT MUTE 10 kΩ HOLE DET Band muting 50 kΩ SD circuit A11732 Continued on next page. No. 6039-12/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit 0.1 µF V REF R1 VCC C R2 37 36 35 34 VCC •The resistor R1 determines the width of the band muting function. Increasing the value of R1 narrows the band. Reducing the value of R1 widens the band. AGC QD output QD input VREF •Null voltage When tuned, the voltage between pins 34 and 37, V34 – 37, will be 0 V. The band muting function turns on when |V34 – 37| ≥ 0.7 V. HOLE DET 390 Ω 34 35 36 37 Quadrature detector 3 pF V37 = 4.9 V 1 kΩ IF limitter amplifier Band muting A11733 R SD ADJ 38 38 FM SD ADJ A 130-µA current flows from pin 38 and, in conjunction with the external resistance R, determines the comparison voltage. 130 µA + – SD Comparator 24 S-meter A11734 24 S-meter 6.4 kΩ 3.6 kΩ 39 Keyed AGC AM stereo buffer The keyed AGC operates when the voltage created by dividing the pin 24 S-meter output voltage by the 6.4 and 3.6 kΩ resistors becomes lower than the voltage determined by the resistor between pin 39 and ground. This pin also is used as the AM stereo IF buffer pin. Comparator KEYED AGC + – 1.3 V 90 µA 39 VCC AM IF out 50 pF 150 Ω A11735 Continued on next page. No. 6039-13/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit VCC 20 kΩ + 41 HCC capacitor 20 kΩ The HCC frequency characteristics are determined by the external capacitor connected at this pin. 41 2200 pF A11736 This pin is used to change the frequency characteristics of the unneeded audio band under 100 Hz in AM mode to produce a clear audio signal. VCC C 42 42 AM L.C. pin Note: The LC capacitor must be connected between this pin and VCC (pin 40). This is because the detector circuit operates referenced to VCC. VCC DET 50 kΩ 1 kΩ + – 50 kΩ The cutoff frequency fC is determined by the following formula. 1 kΩ A11737 fC = 1/2π × 50 k × C VCC 19 kHz∠0° BIAS 30 kΩ 43 Pilot detector Inserting a 1-MΩ resistor between pin 43 and VCC will force the IC to mono mode. 30 kΩ + 30 kΩ 43 1 µF + A11738 Continued on next page. No. 6039-14/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit VCC C 2.2 µF + 0.022 µF 240 kΩ 42 44 IF AGC G1; Used for time constant switching during seeks. • Reception τ = 2.2 µF × 300 kΩ • Seek τ = 2.2 µF × 10 Ω The external capacitors are connected to VCC. This is because the IF amplifier operates referenced to VCC. 44 VCC DET 50 kΩ 50 kΩ IF AGC G1 SEEK ON 10 Ω A11739 Pin 40 VCC 45 Pin 40 VCC 45 IF output The IF amplifier load DET A11740 VCC 50 pF 46 100 Ω 46 AM antenna damping drive output Wide band AGC input I46 = 6 mA (maximum) This is the antenna damping current. 20 kΩ VCC W.AGC AMP. ANT DAMPING DRIVER A11741 Continued on next page. No. 6039-15/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit 30 kΩ R 47 VCC FM muting on level adjustment 140 µA + – 47 Modify the value of the external resistor to adjust the muting on level. Pin 24 Inverter MUTE A11742 VCC 5.6 V 48 57 RF AGC bypass RF AGC RF AGC rectification capacitor The low frequency distortion is determined as follows: Increasing C48 and C57 improves the distortion but makes the response slower. Reducing C48 and C57 aggravates the distortion but makes the response faster. 10 kΩ 48 + – + Antenna damping 3.3 µF For AGC use 57 + 47 µF A11743 2.6 V 50 51 IF bypass FM IF input Due to the high gain of the limiter amplifer, care must be taken when choosing the grounding point for the limiter amplifer input capacitor to prevent oscillation. 10 kΩ 10 kΩ 50 0.022 µF 330 Ω 51 IF in A11744 2 kΩ 100 Ω 52 IF input The input impedance is 2 kΩ. 52 A11745 Continued on next page. No. 6039-16/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit VCC IF OUT 53 • Input and output pin or the first IF amplifier • Inverting amplifier 53 56 IF amplifier output IF amplifier input 300 Ω 300 Ω V56 = 2 V Input impedance: RIN = 330 Ω 2.75 V V53 = 5.3 V Output impedance ROUT = 330 Ω IF IN 56 A11746 Pin 40 VCC Pin 40 VCC 54 54 49 Mixer output: 130 µA Mixer input OSC The mixer coil connected to the pin 54 mixer output must be wired to VCC (pin 40). The pin 49 mixer input impedance is 330 Ω 49 330 Ω A11747 Pin 62 VCC W-AGC N-AGC Pins 55 and 58 include built-in DC cut capacitors. The AGC on level is determined by the values of the capacitors C1 and C2. 55 W-AGC IN AM SD ADJ 58 N-AGC IN Muting attenuation adjustment pin Pin 55 functions as the SD sensitivity adjustment pin in AM mode. The output current I55 is 50 µA, and V55 varies depending on the value of the external resistor. The SD function operates by comparing V55 with the S-meter voltage. 55 30 pF C1 MIX IN 50 pF 58 C2 50 µA MIX OUT + – AM SD Signal meter A11748 Continued on next page. No. 6039-17/50 LA1784M Continued from preceding page. Pin No. Function Description Equivalent circuit 1ST.IF O S C 59 Double balanced mixer Pins 59 and 60 are the mixer 10.7-MHz output VCC 60 59 60 Mixer output 63 64 Mixer input Pins 63 and 64 are the mixer input. This is an emitter insertion type circuit, and the amount of insertion is determined by the capacitors C1 and C2. 30 Ω VCC C1 63 Note:The lines for pins 63 and 64 must be kept separated from the lines for pins 59 and 60. RF AMP 5 pF C2 64 5 pF 620 Ω 620 Ω A11749 Pin 6 functions both as the FM front end VCC and the AM/FM switching circuit. 6 Front end VCC AM/FM switching V6 voltage Mode When 8 V → FM VCC SD 510 Ω 6 + – + FM.F.E AGC 100 kΩ 8V OPEN → AM AM/FM switching circuit 3.3 V 3 GND A11750 AM 1st MIX to RF Amp. 62 62 1st MIX INPUT 10 kΩ First mixer input The input impedance is about 10 kΩ. 2.1 V A11751 10 kΩ 5.6 V 10 AM 2nd OSC Crystal oscillator circuit The Kinseki, Ltd. HC-49/U-S and a CL of 20 pF must be used. 20 pF to 2nd MIX 33 pF 10 X tal A11752 No. 6039-18/50 LA1784M Block Diagram VCC 0.022µF TO AM STEREO (IF OUT) 40 39 0.47µF 38 37 ANT D 49 36 220Ω 51 HOLE DET FMVSM FM SD AMVSM AM SD IF AGC DET DC-C AFC DET CLAMP + 58 W.B.AGC 59 RF AGC VCO STOP MAIN HC AMP KEYED AGC VCC 30Ω + SEP.ADJ FF 18 SUB MAT DEC RIX COUNTER 100kΩ 17 10 11 12 13 AM OSC 6800pF 0.01µF 14 + 15 16 MPX OUT 300pF NC MPX GND 10µF 10µF 240kΩ 22kΩ 4.7kΩ 51kΩ 22kΩ 68pF 2.2kΩ 200kΩ 1kΩ L 10µF 10µF 10kΩ R + + + 0.022µF 0.022µF AM/FM OSC BUFF 18pF + 10.26MHz 22kΩ 10pF 5pF 9 FMIF AM GND 30kΩ + 8 0.015µF 7 0.015µF 6 0.47µF 5 18pF 0.01µF 1MΩ 4 FMIF AM NC MPX VCC 1µF 3 0.22µF 100kΩ 1µF + 10kΩ 10µF 3SK583 19 18 17 16 15 VSS PD VDD FM IN AM IN 14 100pF +B 12V 13 12 1.5kΩ 11 + 5.6V 22kΩ 20 100pF 100kΩ 0.22µF 22pF 100pF 100µF 100pF 51kΩ 7.2MHz DO 5 6 7 8 9 FM/AM 10 1kΩ + 9.1V 22kΩ CL 4 100kΩ CI 3 100µF CE 2 10kΩ 1 10kΩ LC7216M 22pF 1kΩ 0.01µF + 100kΩ 19 30kΩ 2.2kΩ * CSB912JF108 or KBR912F108 0.047µF 20kΩ FF 38k<0 GATE 10kΩ RF AGC ANT D 2 FM GND FM/AM VT TRIG GND 10kΩ 0.22µF 1µF * 0.01µF PI.CAN ADJ 1 100Ω 0.022µF AGC – + ANT D FE GND 30kΩ 5pF 200kΩ 0.1µF 30kΩ 21 TRIG P-CAN AMP PICAN INPUT 0.022µF 18pF 64 100kΩ 180Ω 3SK263 BUFF AM 1ST OSC 63 5pF OSC 0.022µF GND 100kΩ 9pF 39pF 100kΩ 1000pF NOISE AMP BUFF 1000pF 100kΩ 100F 0.022µF 22pF 22pF + PILOT DET LPF 20 AM/FM SEEK→AM/FM SD STOP→FM ST IND. 5V 5.6kΩ 22 + HPF 8pF 1000pF VCO 61 0.022µF 62 GND AM/FM S-METER 0.47µF 23 FF 19k<0 MIX FEVCC 24 PHASE COMP INPUT 60 30Ω FF 19k<90 k FM/AM VSM MUTE ATT VCC 10kΩ 26 HCC 62pF 0.022µF 2kΩ SNC RIGHT CH. 330Ω SEEK SW 1µF HCC 1µF 25 SD/ST IND 8200pF AM HC 27 56 57 50kΩ AM LEVEL ADJ NC-IN SNC IF AM/FM REG SW TWEET AM FM VREF 200kΩ 28 + + RF AGC WB AGC 55 FE IF IN 300Ω 29 MRC MIX FM WB AGCIN 20kΩ METER DET OUT IF BUFF 54 1000pF 0.47µF MUTE DRIVE L.C. 53 AM SD ADJ AM MIX OUT FM ANT IN AFC IN 30 BUFF 52 1kΩ 100kΩ FM 240kΩ AM IF IN 31 MUTE AMP Q.DET IF limiter limiter amplifier amplifier 100Ω 510kΩ 32 LEFT CH. 15pF 15pF 47µF 100kΩ + 0.022µF OSC OSC BUFF 50 FM IF OUT AM RF GND MUTE DRIVE 1µF 33 34 22kΩ FM IF IN ANTD 0.022µF AM ANT IN 35 N.C.MPX GND FC18 100µH AM VCC QD OUT QD IN VREF 0.22µF 100µF 41 100kΩ 42 GND 43 6.8kΩ KEYED AGC 30kΩΩ FM SD ADJ. AM LC 2200pF 0.022µF 1µF 44 + + 45 10kΩ 1µF 100µF 0.022µF 2.2µF 46 0.1µF + 47 + + 10kΩ 1MH 620Ω 30MH + 240kΩ RFAGC 48 0.022µF + CHCC 0.022µF + IF7 3.3µF 30Ω 11kΩ PILOT DET GND 100pF CE CI CL DO RDS ADC MUTE SD/MONO ST R ON LC867148 A11753 No. 6039-19/50 LA1784M AC Characteristics Test Circuit VCC 8V VCC 0.47µF 35 0.1µF MUTE DRIVE 33 34 32 31 MUTE AMP Q.DET AMVSM AM SD IF AGC DET 30 HOLE DET FMVSM FM SD MUTE DRIVE 29 DC-C AFC DET CIAMP L.C. 28 MRC-IN + 8200pF AM HC NC-IN PG1 (AC1) HCC HCC SNC 1µF SNC 58 W.B.AGC 59 RF AGC HCC FF 19<0 MAIN HC 6 7 FF 18 SUB MA DEC TRIX SW1 + 100kΩ VD3 100kΩ VR2 0.01µF PI.CAN ADJ 8V 0.022µF 3pF VCC2 VA8 15 16 MPX OUT 0.015µF 14 SEP.ADJ VR1 SW9 8V 0.022µF 3pF VCC 10µF 10µF 8V VA1 SW10 10.26MHz X TAL VCC 10 11 12 13 AM OSC + 6800pF 0.01µF + 0.022µF FM VCC FM GND SW6 VA6 VA9 RIGHT CH. 20pF 20kΩ 9 0.01µF 10kΩ 1MΩ OSC 0.022µF VT 8 10kΩ 5 0.47µF 4 5pF + SW5 19 GATE 1MΩ GND TRIG + 100Ω 0.022µF AGC 10kΩ 1µF 100Ω FE GND ANT D RF AGC VD1 3 50kΩ 0.22µF 1µF CSB912JF108 0.047µF 20kΩ 17 2 5V VCC1 VA3 FM/AM IFBUFF. 5.6kΩ 20 FF 38k<0 ANT D 1 50kΩ + 21 TRIG P-CAN BUFF AM 1ST OSC 30kΩ 39pF 64 AM/FM S-METER 0.47µF + PILOT DET 63 5pF 22 BUFF 3pF 5pF VCO VCO STOP FF FM/AM REG SW VD2 GND SEEK→AM/FM SD STOP→AM ST BUFFER FM ST IND. 23 MIX 61 AM/FM 100kΩ 50Ω + 1000µF 24 PHASE COMP – + 62 25Ω LPF FF 19<90 k 0.015µF FEVCC VCC AC1 SG1 HPF KEYED AGC 0.022µF VCC 50Ω AM FM VREF 60 SW7 VCC3 + 57 AM/FM OSC BUFF 200kΩ 25 0.022µF 30Ω 300kΩ VD6 26 56 10pF MUTE ATT 1kΩ MRC TWEET 300pF ANTD 0.022µF RF AGC W.B. AGC LEFT CH. 510Ω SNC VD4 + MIX 55 N.C.MPX GND FE IF IN 330Ω JIS DUMMY SW8 27 10kΩ 20kΩ + 0.022µF 47µF 100kΩ 6.8MH FM WB AGCIN 0.022µF 15pF 65pF 30kΩ + AC2 SG2 100µH AC5 SW4 (T) A B NC-IN IF BUFF AM SD ADJ AM MIX OUT FC18 50Ω 30Ω AM LEVEL ADJ DET OUT 100µH 54 VCC2 1µF FM S-METER + QD IN AFC IN QD OUT 0.22µF 100µF VREF 36 BUFF 52 53 FM IF OUT 37 10kΩ 1MH 38 1MΩ 0.022µF AM IF IN 39 IF limiter amplifier 51 0.022µF 40 OSC OSC BUFF 330Ω 300Ω 200Ω 30Ω 41 4.3kΩ VD5 + + 42 10kΩ + 43 6.8kΩ KEYED AGC 22kΩ FM SD ADJ. AM LC CHCC 2200pF 0.022µF 1µF 44 0.1µF 100kΩ ANT D FM IF IN 50 45 + 100kΩ 46 + 10kΩ 1µF 47 49 0.022µF + 240kΩ RFAGC 48 620Ω + IF7 + 2.2µF 3.3µF B SW2 ( i ) MIX A 50Ω AC3 SG3 SW3 15kΩ IF OUT IF IN 300Ω + 50Ω MUTE OR ADJ 0.022µF VA2 PILOT DET GND VA7 A11754 No. 6039-20/50 LA1784M Test Conditions Parameter Current drain Demodulation output Pin 31 demodulation output Channel balance Total harmonic distortion (FM) Symbol Switch states SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10 ICCO-FM ON b OFF b — ON OFF OFF ON — VO-FM ON b OFF b — ON OFF OFF ON — VO-FM31 ON b OFF b — ON OFF OFF ON — CB ON b OFF b — ON OFF OFF ON — THD-FMmono ON b OFF b — ON OFF OFF ON — — Signal-to-noise ratio: IF S/N-FM IF ON b OFF b — ON OFF OFF ON AM suppression ratio: IF AMR IF ON b OFF b — ON OFF OFF ON — Att-1 ON b OFF b — ON OFF OFF ON — — Muting attenuation Separation Att-2 ON b OFF b — ON OFF OFF ON Att-3 ON b OFF b — ON OFF OFF ON — Separation ON b OFF b — ON OFF OFF ON — Stereo on level ST-ON ON b OFF b — ON OFF OFF ON — Stereo off level ST-OFF ON b OFF b — ON OFF OFF ON — THD-Main L ON b OFF b — ON OFF OFF ON — PCAN ON b OFF b — ON OFF OFF OFF/ON — Main total harmonic distortion Pilot cancellation AttSNC ON b OFF b — ON OFF OFF ON — HCC output attenuation 1 SNC output attenuation AttHCC-1 ON b OFF b — ON OFF OFF ON — HCC output attenuation 2 AttHCC-2 ON b OFF b — ON OFF OFF ON — Vi-lim ON b OFF b — ON OFF OFF ON ON Input limiting voltage Muting sensitivity Vi-mute ON b OFF b — ON OFF OFF ON — SD sensitivity 1 SD-sen1 FM ON b OFF b OFF OFF OFF OFF ON — SD sensitivity 2 SD-sen2 FM ON b OFF b ON OFF OFF OFF ON — VIFBUFF-FM ON b OFF b OFF OFF OFF OFF ON — VSM FM-1 ON b OFF b — ON OFF OFF ON — VSM FM-2 ON b OFF b — ON OFF OFF ON — VSM FM-3 ON b OFF b — ON OFF OFF ON — VSM FM-4 ON b OFF b — ON OFF OFF ON — Muting bandwidth BW-mute ON b OFF b — ON OFF OFF ON — Mute drive output VMUTE-100 ON b OFF b — ON OFF OFF ON — N-AGC on input VNAGC ON a ON b — ON OFF OFF — — W-AGC on input VWAGC ON a ON b — ON OFF OFF — — Conversion gain A.V ON a ON b — ON OFF OFF — — VOSCBUFFFM ON a ON b — ON OFF OFF — — τGATE1 ON — OFF a — ON OFF OFF — — SN ON — OFF a — ON OFF OFF — — SN-NC ON/OFF — OFF a — ON OFF OFF — — VMRC ON — OFF b — ON OFF OFF — — — IF counter buffer output Signal meter output (FM) Oscillator buffer output Gate time 1 Noise sensitivity NC effect MRC output MRC operating level MRC-ON ON — OFF b — ON OFF OFF — Practical sensitivity S/N-30 OFF — OFF b ON ON — — — — Detection output VO-AM OFF — OFF b ON ON — — — — Pin 31 detection output VO-AM31 OFF — OFF b ON ON — — — — AGC F.O.M. VAGC-FOM OFF — OFF b ON ON — — — — Signal-to-noise ratio S/N-AM OFF — OFF b ON ON — — — — Total harmonic distortion (AM) THD-AM OFF — OFF b ON ON — — — — VSM AM-1 OFF — OFF b ON ON — — — — VSM AM-2 OFF — OFF b ON ON — — — — VOSCBUFF AM-1 OFF — OFF b ON ON — — — — W-AGCsen 1 OFF — OFF b ON ON — — — — W-AGCsen 2 OFF — OFF b ON ON — — — — SD-sen1 AM OFF — OFF b OFF OFF — — — — SD-sen2 AM OFF — OFF b OFF OFF — — — — VIFBUFF-AM OFF — OFF b OFF OFF — — — — Signal meter output (AM) Oscillator buffer output Wide band AGC sensitivity SD sensitivity IF buffer output No. 6039-21/50 LA1784M Usage Notes 1. Notes on VCC and Ground Pin 40 VCC for the FM IF, AM, NC, MPX, and MRC blocks Pin 25 Ground for the FM IF and AM blocks Pin 14 Ground for the NC, MPX, and MRC blocks Pin 61 VCC for the FM front end, AM first mixer, and first oscillator blocks * Pin 6 VCC for the FM front end and AGC blocks, and the AM/FM switching pin Pin 3 Ground for the FM front end, first mixer, and first oscillator blocks 2. Notes on AM Coil Connection The VCC used for the first oscillator coil connected to pin 7 must be at the same potential as pin 61. Connect to the IFT connected with pin 45, and to the MIX coil connected with pin 54. VCC must be at the same potential as pin 40. 3. AM/FM Switching Pin 6 is also used as the FM front end and RF AGC VCC Pin 6 voltage Mode 8 FM OPEN AM Fig. 1 4. Notes on the FM Front End Notes on interference rejection characteristics • Intermodulation characteristics The LA1784M applies two high-band AGC functions to prevent IM (the generation of intermodulation). These are the narrow AGC (pin 58: mixer input detection type) and the wide AGC (for the pin 55 input), and this results in the antenna frequency characteristics shown in figure 2. The levels at which the AGC functions turn on are determined by the capacitors attached at pins 55 and 58. ∆f — AGC Sensitivity When ∆f = 0, 98.1 MHz AGC sensitivity — dBµ 110 100 The wide AGC sensitivity when pin 39 is 5 V. 90 80 70 The narrow AGC sensitivity when pin 39 is at ground. 60 50 –5 –4 –3 –2 –1 0 1 2 3 4 5 ∆f — MHz Fig. 2 No. 6039-22/50 LA1784M • Notes on second-channel attenuation suppression Keyed AGC (3D AGC) is a technique for achieving good characteristics for both intermodulation and secondchannel attenuation at the same time. When the desired signal is faint or nonexistent, the high-band AGC level will be essentially 0, and as a result automatic tuning may malfunction and blocking oscillation may occur in the presence of strong interfering stations. Keyed AGC helps resolve these problems. This 3D AGC technique uses information that has the following three frequency characteristics and is a unique Sanyo-developed system for determining the high-band AGC level. RF and ANT circuit information: Mixer input AGC Mixer circuit information: Mixer output AGC CF selectivity information: S-meter output • 3D AGC Features Feature Merit Only the narrow AGC sensitivity (operation at ∆f < 1.5 MHz) is controlled by the field strength of the desired station. • Effective in resolving second-channel attenuation problems. The narrow AGC sensitivity is controlled by a voltage (V 23) that is under 0.5 V. • Allows effective resolution of second-channel attenuation problems without degrading three-signal characteristics. The wide AGC can operate even when V23 = 0 (when the desired station is not present). • Seek operations may stop incorrectly due to the occurrence of intermodulation. • It is possible to prevent the occurrence of intermodulation in the RF tuning circuit and antenna in the presence of strong interfering stations, and blocking oscillation due to AGC operation can be prevented. The narrow and wide AGC sensitivities can be set independently. (See figure 3 and 4.) • Settings can be optimized for the field conditions. The system has two AGC systems: narrow and wide AGC. (See figure 5.) • Since the narrow AGC operates for the desired station and adjacent stations, the wide AGC sensitivity can be lowered and AGC malfunction due to local oscillator signal can be prevented. ∆f — AGC on Level (ANT input) ∆f — AGC on Level (ANT input) Fig.4 Fig.3 Pin 55 capacitor: 3 pF 110 Wide AGC on level — dBµ Narrow AGC on level — dBµ 110 100 90 Pin 58 capacitor: 10 pF 80 70 keyed AGC 39 Pin 58 capacitor: 47 pF 60 50 –5 –3 –4 –2 –1 1 0 2 3 4 90 Pin 55 capacitor: 10 pF 80 70 keyed AGC 39 5V 60 50 5 –5 –4 –3 –2 –1 0 1 2 3 4 5 ∆f — MHz ∆f — MHz Pin 59 narrow AGC and pin 55 wide AGC input levels — dBµ 100 W-AGC, N-AGC — f Fig.5 70 80 s Wide AGC on level frequency characteristic Narrow AGC on 90 level frequency characteristics 100 110 120 130 AGC input level frequency characteristics such that VRFAGC (pin 2) falls under 2 V. 140 7 1.0 2 3 5 7 10 2 3 5 7 100 2 3 5 Frequency, f — MHz No. 6039-23/50 LA1784M 3D AGC Sensitivity Characteristics AGC sensitivity Wide AGC sensitivity ∆F 1 2 Second-channel attenuation improvement Narrow AGC sensitivity 3 Desired station AGC sensitivity 4 V23 (Desired station field strength) A12075 Fig. 6 Figure 6 3D AGC Sensitivity — ∆f, V23 characteristics • The wide AGC sensitivity is determined by the antenna and RF circuit selectivity, regardless of V23. • The narrow AGC sensitivity is determined by the following. The total selectivity of the antenna, RF circuit, and mixer when V23 ≥ 0.5 V The above selectivity and V23 when V23 < 0.5 V • The improvement in the second-channel attenuation corresponds to the area occupied by the narrow AGC in the total AGC sensitivity area. Figure 8 on the next page shows the actual operation of the circuit. The fu input level at which antenna damping turns on — dBµ ∆f — AGC on Level (ANT input) 110 fD = 98.1 MHz Second-channel pad 100 90 ANT IN VIN 80 70 fu = 98.1 MHz + ∆f 60 50 –5 –4 –3 –2 –1 0 1 ∆f — MHz 2 3 4 A12076 5 Fig. 7 No. 6039-24/50 LA1784M 7. Notes on 3D AGC (Keyed AGC) VCC 55 W-AGC DET 58 N-AGC DET 90µA S-meter + – VCC + – 1 2 39 24 + ANT DUMPING VS-meter A11763 Fig. 8 • The antenna damping current from the pin due to the pin diode flows when the V2 pin reaches the VCC - VBE level. • The narrow AGC operates as follows. When pin V39 > pin V24: The narrow AGC turns off. When pin V39 < pin V24: The narrow AGC turns on. No. 6039-25/50 LA1784M • The LA1784M includes two AGC circuits in its front end block. — Antenna input limiter using a pin diode. — FET second gate control The AGC input pin is pin 59, and the AGC circuit turns on when a signal of about 30 mVrms is input. AGC activation The pin diode drive circuit turns on when VCC – V2 is greater than or equal to about 1 V, and input limitation is applied to the antenna circuit. In application circuits, there will be an attenuation of about 30 to 40 dB. Next, when an adequate current flows in the antenna attenuator pin diode, the inductance falls, the FET second gate voltage drops, the FET gm falls, and the AGC operates. The recommended FET is the Sanyo 3SK263, which is an enhancement-type MOSFET. Therefore, full AGC is applied when the voltage, VG2-S, between the second gate and the source is 0. Note that if a depletion-type MOSFET is used, AGC will not be applied unless VG2-S is less than 0. V2 AGC Characteristics Fig.9 9 fr = 98.0 Hz VCC = 8 V Ta = 25°C 8 6 Range where AGC level AGC level due the AGC does due to the to the MOSFET not operate pin diode: second gate: about 35 dB about 35 dB 5 4 3 2 1 0 –10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 ANT IN — dBµ 63 62 MIX VCC 60 MIX INPUT Due to optimized device geometry, emitter current, the bias, this IC achieves the following performance. 59 MIX OUT 64 MIX OUT • Mixer The mixer circuit in this IC is a double-balanced mixer with both balanced input and balanced output. Input circuit type Emitter input Input impedance: 25 Ω MIX INPUT V2AGC — V 7 MIX Mixer input usable sensitivity: 15 dBµ Mixer input IMQS: 90.5 dBµ (For an oscillator level of 200 mVrms) OSC * The mixer input IMQS is defined as: fr = 98.8 MHz, no input fu1 = 98.8 MHz, 1 kHz, 30% modulation fu2 = 99.6 MHz, no modulation The interference 1 and 2 input levels such that generated intermodulation output signal-to-noise ratio becomes 30 dB when an interference signal with the same level as the mixer input is input, and distortion occurs in the mixer. Mixer circuit A12077 Fig. 10 No. 6039-26/50 LA1784M • Oscillator Figure 11 shows the type of oscillator circuit used in this IC. It includes both an oscillator and an oscillator buffer. VCC 18pF 4 25pF AM/FM OSC BUFFER OUT 5 VT 20pF A12078 Fig. 11 • Figure 12 shows the type of FM first IF amplifier used in this IC. It is a differential single-stage amplifier. 330Ω TO MIX FM IF input 56 53 330Ω + 330Ω – A12079 Fig. 12 Specifications Input impedance: 330 Ω Output impedance: 330 Ω Gain: 20 dB No. 6039-27/50 LA1784M 5. FM IF • Notes on the FM SD and SD adjustment The figure below presents an overview of the FM SD and the IF count buffer. 4.9V R + – R + – R Band muting Muting drive output HOLE CLET STEREO IND S-meter IF count buffer + – 39 24 FM IF 33 23 26 5V IF count output SD STEREO/MONO 2.5V 5V Fig. 13 A11759 Figure 14 shows the relationship between the FM SD, the IF count buffer output, the S-meter, and the muting drive output. V24 Larger values of R33 S-meter V38 V33 Smaller values of R33 V33 over 0.7 V V33 over 0.7 V V26 5V SD ON On as an SD signal SD ON Mono Stereo V23AC 0.7 V OFF IF count buffer OFF IF counter output off V23DC 5V 2.5 V 0V RDS and other types of SD detection can be used by switching these modes. New LA1784M functionality: For stereo input (when the V26 pin voltage is 0.7 V), when this pin is shorted to ground (0.1 V or lower) the IC will operate in forced mono mode. A11758 Fig. 14 No. 6039-28/50 LA1784M • Transient response characteristics during automatic tuning The transient characteristics for SD and IF count buffer on/off operation are determined by the time constants of the RC circuits attached to the following pins. (1) Muting time constant: pin 33 (2) S-meter time constant: pin 24 (3) AFC time constant: pin 34 There are two points that require consideration when using fast tuning. (1) The SD time constant due to the S-meter time constant Since the current I24 (pin 24) varies with the field strength, the time constant also changes. There is no hysteresis in the comparator. If C24 is made smaller and the pin 24 voltage is used for the keyed AGC pin 23, C23 must be chosen so that AGC during keyed AGC operation does not become unstable. S-meter SD comparator I24 24 R24 C24 A12080 Fig. 15 (2) The SD time constant due to the pin 33 muting voltage time constant The changes in volume due to field fluctuation during weak field reception can be made smoother by setting the attack and release times during soft muting operation. Mute drive Mute amp 10kΩ Muting time constants Attack: 10 kΩ × C33 50kΩ Attack Release: 50 kΩ × C33 Release 33 C33 A11766 Fig. 16 Antenna input such that pin 5 goes high — dBµ SD Sensitivity Adjustment Fig.17 50 40 30 20 10 0 6 10 14 18 22 26 30 34 Resistance between the pin and ground — kΩ No. 6039-29/50 LA1784M However, when testing this stop sensitivity, note that when checking the waveform on the IF count buffer output (pin 23), there are cases, such as that shown below, where current in the test system may be seen as flowing to ground and cause oscillation that causes the IF count buffer output to go to the output state. F.E. IF buffer amp IF 5V 0.022 µF Test system capacitance The 10.7 MHz feeds back through ground. A12081 Fig. 18 • FM Muting control pin (pin 47) (R47: 30 kΩ variable resistor) The –3 dB limiting sensitivity can be adjusted with R47. FM Soft Muting (1) R47 = 7.5 kΩ Fig.19 DET out Output, Output noise — dB 15 kΩ 10 kΩ 20 kΩ Noise Antenna input — dBµ • FM muting attenuation adjustment (pin 58) The muting attenuation can be switched between the three levels of –20, –30, and –40 dB by the resistor inserted between pin 58 and ground. (Note that the exact values depend on the total tuner gain.) The noise convergence with no input is determined by the pin 58 voltage. 58 100Ω R58 R58 A11764 Mute ATT Open –20 dB 200 kΩ –30 dB 30 kΩ –40 dB The attenuation can be set by making R33 smaller as listed in the table above. 33 R33 A11765 Fig. 20 No. 6039-30/50 LA1784M FM Soft Muting (2) FM Soft Muting (3) Fig.21 Fig.22 R47 = 7.5 kΩ R47 = 7.5 kΩ DET out DET out 10 kΩ Output, noise — Output noise — dB dB Output — dB 10 kΩ Output — dB 15 kΩ 200 kΩ 20 kΩ Noi se 15 kΩ 30 kΩ Nois 2 0kΩ Antenna input — dBµ e Antenna input — dBµ VCC Quadrature detector 200 kΩ R Mute amp. (VCA) + – R + – N-AGC Mute drive Limiter R 58 33 31 DET out To MIX out Open 200 kΩ 30 kΩ Fig. 23 A11767 • FM muting off function Forcing this pin to the ground level turns muting off. Detector output 0 1 When the pin is at the ground level, the noise convergence will be 10 dB and the –3 dB limiting sensitivity will be about 0 dBµ. 20 Antenna input A12082 Fig. 24 No. 6039-31/50 LA1784M • Hall detection The Hall detection function detects the level of the pin 36 quadrature input signal and then applies peak detection to that result. The result is output from pin 33. This circuit has three effects. (1) It assures that muting will be applied for weak inputs with an antenna input of under 5 dBµ. The amount of attenuation is referenced to an antenna input of 60 dBµ, fm = 1 kHz, and a 22.5 kHz dev output, and is variable from 10 dB to 40 dB when there is no input. Thus one feature of this circuit is that the weak input noise attenuation and the –3 dB limiting sensitivity for over 5 dBµ inputs can be set independently. Hall Detection Output — Antenna Input Characteristics Fig.25 5 Area muted by Hall detection V38pin — V 4 3 2 1 0 –20 –10 0 10 20 30 Antenna input — dBµ (2) When the pin 36 quadrature input is a saturated input, the pin 36 noise level (Va) is detected and a peak-hold function is applied to pin 33 (Vb) for locations rapid field strength variations and severe multipath occurs for fields that result in an antenna input level of over 5 dBµ. 36 33 Vb Va 0 + 0.1µF 0 A12083 Fig. 26 (3) Unique features One unique feature of the LA1784M is that if there are adjacent stations such that f1 = 98.1 MHz and f2 = 97.9 MHz, a search operation will not stop at 98.0 MHz. Since VAFC = 0 V and VSM = 3.6 V at 98.0 MHz in the situations shown in figure 27 and 28, even though Hall detection would normally not operate and SD would be high, in this IC the Hall detection circuit will operate, VMute will be set to 1.2 V (over 0.7 V) and the SD signal will go low, thus preventing incorrect stopping of the search. No. 6039-32/50 Fig.27 f1 f2 ANT IN 0 Pin 24, VSM — V –1 6 4 2 0 6 4 2 f2 = 97.9 MHz, 120 dBµ fm = 400 Hz, 22.5 kHz dev. f1 = 98.1 MHz, 120 dBµ fm = 1 kHz, 22. 5kHz dev. 0 8 Pin 26 (SD) — V Unique Features of the LA1784M Hall Detection Circuit (2) 2 1 Fig.28 When the tuner is moved in 50 kHz steps. With a 51 kΩ resistor between pins 37 and 34. With the SD sensitivity adjusted to be 20 dBµ. 0 –1 6 4 2 0 97.7 97.9 97.8 98.0 98.1 98.2 Pin 24, VSM — V 1 When the tuner is moved in 50 kHz steps. With a 51 kΩ resistor between pins 37 and 34. With the SD sensitivity adjusted to be 20 dBµ. Voltage between pins 37 and 34, VAFC — V Pin 33, VMute — V Unique Features of the LA1784M Hall Detection Circuit (1) 2 6 4 2 0 6 4 2 0 f2 = 97.9 MHz, 40 dBµ fm = 400 Hz, 22.5 kHz dev. f1 = 98.1 MHz, 40 dBµ fm = 1 kHz, 22.5 kHz dev. 8 Pin 26 (SD) — V Voltage between pins 37 and 34, VAFC — V Pin 33, VMute — V LA1784M 6 4 2 0 97.7 98.3 Frequency, fr — MHz 97.8 97.9 98.0 98.1 98.2 98.3 Frequency, fr — MHz • Notes on the quadrature input level When a strong field is being received the quadrature signal input (pin 36) requires a 200 mV rms input, and the detection transformer and the damping resistor between pins 36 and 37 must be designed. (We recommend the Sumida SA-208 transformer and a 10 kΩ resistor between pins 36 and 37.) When the pin 36 input level falls below 160 mV rms, the Hall detection circuit operates and the pin 33 mute drive output voltage increases. Therefore, when pin 36 input is from 160 to under 200 mV rms during strong field reception, the muting circuit may or may not operate due to sample-to-sample variations between individual ICs. Furthermore, the SD function may not operate, and the audio output level may be reduced. Incorrect operation due to sample-to-sample variations and temperature characteristics can be prevented by keeping the pin 36 voltage at 200 mVrms or higher. Pin 33 VMute — QD Input Level SA208 + LA1784M IF Input Characteristics Fig.29 6 Fig.30 4 0.8 With pins 34 and 37 shorted. With 5 V applied to pin 24. 3 0.6 5 THD — % Vmute — V 2 0.4 4 3 2 75 Ω SG 75 Ω + 0.022 µF 1 36 10.7 MHz 0 92 94 96 37 98 102 –100 –80 –60 –40 –20 –120 With the resistor between pins 36 and 37 open. With a 10 kΩ resistor between pins 36 and 37. 0 20 –0.2 –0.4 40 60 80 ∆f — kHz 100 120 ∆f=0→ 10.7 MHz –0.6 Voltage between pins 37 and 34 LA1888M 100 THD 1 kHz 75 kHz dev 1 0.2 –0.8 (referenced to the pin 37 voltage) 104 106 QD input level — dBµ No. 6039-33/50 LA1784M R36-37 Detector output Pin 36 AC level MPX OUT Vo QDIN Open 330 mVrms 235 mVrms 10 kΩ 280 mVrms 200 mVrms • Band Muting Adjustment Procedure The muting bandwidth can be modified as shown in figure 31 with the resistor RBW between pin 34 and 37. Bandwidth such that the pin 33 voltage ≥ 2 V — kHz RBW — Muting Bandwidth Fig.31 280 RBW + 240 + 1 µF 0.47 µF SA208 Sumida 200 10 kΩ 37 160 36 35 34 ANT IN 98 MHz 100 dBµ 120 80 40 0 1.0 3 2 5 7 2 10 3 5 7 100 2 Resistor RBW between pins 34 and 37 — kΩ 6. AM • AM AGC system The LA1784M RF AGC circuit takes its input from three sources: the WIDE AGC pin (pin 46), the MIDDLE AGC pin (pin 49) and NARROW AGC. There is also an IF AGC circuit. RW 1st MIX 10.7MHz CF 62 RF 2nd MIX 450kHz CF 49 IF Amp. DET 52 31 VCC 42 1st OSC X'tal 240 kΩ VCC Amp. 46 IF AGC 44 2.2 µF Middle AGC IN Narrow AGC IN Wide AGC IN ANT damping RF AGC 57 + 47 µF 48 + 3.3 µF Fig. 32 A11762 No. 6039-34/50 LA1784M AM AGC f characteristics Wide AGC Operates for wide band interference Wide AGC Operates for wide band interference AGC on level 90 Middle AGC Operates for interference within ±70 kHz of the received frequency. 80 70 Middle AGC Operates for interference within ±70 kHz of the received frequency. Narrow AGC Operates at the received frequency. 60 1000 900 800 Fig.33 100 1100 1200 Frequency — Hz Wide Band AGC Circuit Fig.34 30 Ω 110 50 Ω –6dB 50 Ω SG Received frequency: 1 MHz 0.022 µF 46 0.022 µF 100 510 Ω ANTD 0.022 µF 90 80 70 1.0 2 3 5 7 10 2 3 5 Pin 46 input — MHz The wide band AGC circuit in this IC has the frequency characteristics shown above. The pin 46 input frequency characteristics are identical to those of the RF amplifier gate. This AGC circuit serves to prevent distortion at the FET input when a strong signal is applied to the antenna circuit. The level at which the AGC circuit turns on can be adjusted to an arbitrary level with the wide band AGC adjustment resistor. A delayed AGC on level can be handled by reducing the value of the adjustment resistor. Wide band AGC adjustment resistor 0.022 µF VCC 30 Ω 620 Ω 1MH 100 µH FC18 57 15 pF 15 pF + 47 µF 100 kΩ 0.022 µF 100 µH 30MH Antenna damping on input level — dBµ 120 62 Fig. 35 A12084 No. 6039-35/50 LA1784M • Notes on AM SD (pin 26) and the SD adjustment pin SD and the IF buffer are operated by comparing the S-meter level (V24) and the 5 V reference voltage as shown in figure 36. S-meter AM IF Comparator VCC + – IF buff amp. 50 pF 50 µA 55 24 23 26 100 kΩ 100 kΩ 0.47 µF 0.022 µF 51 kΩ IF buffer 5V SD Seek 5V Fig. 36 A12085 Figure 37 shows the relationship between the AM SD, the IF count buffer, and the S-meter. V24PIN Larger values of R55 S-meter V55 V26 Smaller values of R55 SD on V23AC IF buffer on OFF V23DC 5V Pin 55: AM SD adjustment pin 0V A11760 Antenna input such that pin 26 becomes 5 V — dBµ AM SD Sensitivity Adjustment Fig.38 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 Resistance between pin 55 and ground — kΩ No. 6039-36/50 LA1784M • AM high band cut and detector output level adjustment methods The pin 31 AM and FM tuner output has an impedance of 10 kΩ in AM mode and a few tens of Ohms in FM mode. Therefore, R31 is used to lower the AM detector output level and C31 determines the AM high band frequency characteristics. VCC FM detector 31 R31 C31 VCC + AM detector 10 kΩ Noise canceler input 30 50 kΩ A12086 Fig. 39 • AM stereo system pins To the AM stereo decoder VCC GND 400 mV rms 450 kHz output IFT 45 39 VCC 50 pF 150 Ω Keyed AGC IF AMP. Fig. 40 A11761 No. 6039-37/50 LA1784M • AM low band cut adjustment method The AM low band frequency characteristics can be adjusted with C42, which is inserted between pin 42 and VCC. Since the detector is designed with VCC as the reference, C42 must be connected to VCC. Detector Output — Frequency Fig.42 20 0.1 µF VCC 80%mod With no C31 used. 10 42 50 kΩ 10 kΩ + AM detector 10 kΩ – 50 kΩ To pin 31 10 kΩ Detector output — dB C42 0 30%mod 0.022 µF C31pin 0.047 µF = 6800 pF 0.1 µF C42pin= Using SEP 450H –10 –20 –30 A12087 Fig. 41 –40 fr = 100 kHz fm = 10 kHz 30%mod –50 3 5 70.01 2 3 5 7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 Frequency — Hz 7. Noise Canceler Block • The noise canceler input (pin 30) has an input impedance of about 50 kΩ. Check the low band frequency characteristics carefully when determining the value of the coupling capacitor used. Note that fC will be about 3 Hz when a 1 µF capacitor is used in the application. • Pins 8 and 9 are used to set the noise detector sensitivity and the noise AGC. It is advisable to first set the noise sensitivity for a medium field (an antenna input of about 50 dBµ) with pin 8 (the noise sensitivity setting pin), and then set the AGC level for a weak field (20 to 30 dBµ) with pin 9 (the AGC adjustment pin). If the noise sensitivity is increased, the AGC will become more effective but, inversely, the weak field sensitivity will be reduced. Noise canceler 10 kHz overmodulation malfunction may be a problem. In particular, when an overmodulated signal is input, the noise canceler may, in rare cases, malfunction. This is due to the fact that the IF detector output has a waveform of the type shown in figure 43 due to the bands of the IF ceramic filters as shown below. (Here, the antenna input is 60 dBµ, the ceramic filters are 150 kHz × 1 and 180 kHz × 2, f = 10 kHz, 180 kHz dev.) The noise canceler reacts to the spikes (whiskers) generated due to this overmodulation, which results in distortion to the audio output. (The spike components due to overmodulation occur due to the bands of the ceramic filters in the tuner.) The following describes a method for resolving this problem. This incorrect operation due to overmodulation is prevented by removing the spike components due to this overmodulation with a low-pass filter consisting of a 1 kΩ resistor and a 2200 pF capacitor shown in figure 44. However, note that the FM separation characteristics in the high band and the AM frequency characteristics will change. IF audio output f = 10 kHz,180 kHz dev IF output 1 kΩ Noise canceler input + H1 W1 2.5OU 31 2200 pF – 30 1 µF A12089 Fig. 44 –2.5OU –19.00 µs 981.00 µs Fig. 43 A12088 No. 6039-38/50 LA1784M 8. Multiplexer Block • HCC (high cut control) frequency characteristics (pin 41) When the HCC function operates, the frequency characteristics of the output signal are determined by the capacitance of the external capacitor connected to pin 41. 20 kΩ To the matrix VO (dB) 41 C A12090 Fig. 45 1 2πC × 20 kΩ 1 fC = ——————— [Hz] 2π × C × 20 kΩ Frequency Characteristics Fig. 46 f (Hz) A12091 Fig.47 10 Changes in the pin 41 capacitor capacitance (for a 100% high cut ratio) 0.001 µF 0µ F –10 0.0022 µF –20 0.0047 µF –30 F 1µ 0.0 Attenuation, HCC — dB 0 –40 –50 –60 3 VCC = 8.0 V f = 98 MHz 100%mod 80 dBµ IN 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 Frequency, f — Hz • Pilot canceler adjustment (pins 17 and 18) Noise 30 canceler input – To the multiplexer Fig. 48 Gate Pilot cancel 11 12 17 18 6800 pF 3.9 kΩ 0.01 µF 50 kΩ A12092 The pilot canceler signal waveform (pin 19) is a 19 kHz signal that contains no third harmonic as shown in figure 48. Since this signal has the same phase as the pilot signal, no capacitor is required between pin 18 and ground. Since it has no third harmonic component, excellent pilot cancellation can be acquired in both the left and right channels by adjusting with a variable resistor. No. 6039-39/50 LA1784M • Separation adjustment (pin 19) 5 kΩ To the subdecoder Larger 19 A12094 20 kΩ 0.047 µF C Fig. 49 A12093 The separation is adjusted by modifying the input level to the subdecoder with the variable resistor connected to pin 19. Since only the sub-modulation level is changed by changing the variable resistor setting, the monaural (main) output level is not changed. Furthermore, degradation of high band separation in the decoder can be avoided if the impedance of the external capacitor (C) in the subchannel frequency band (23 to 53 kHz) is made sufficiently smaller than the variable resistor. 9. MRC Circuit VCC 2 µA S-meter 100 Ω FM S-meter DC buffer MRC 30 kΩ 6.4 kΩ 10 kΩ 3.6 kΩ 24 + QMRC 75 pF 1 kΩ 32 Noise amplifier High-pass filter with Fc = 70 kHz + amplifier An external transistor equivalent to the 2SC536 is required Reason: A QMRC level shifter is required to allow a simplified MRC circuit to be used in the LA1781M. 27 + C27 VCC To the SNC, pin 28 A11768 Fig. 50 No. 6039-40/50 LA1784M (1) When there is no AC noise on pin 32 V24 = V27–VBE ↑ QMRC V27 is about 2.5 V when the antenna input is 60 dB or higher. (2) Since the MRC noise amplifier gain is fixed, the MRC circuit is adjusted by reducing the AC input level. 32 + Fig. 51 A11769 (3) The MRC attack and release are determined by C27 on pin 27. Attack: 7 µA · C27 → 2 µA · C27 Release: 500 Ω · C27 → 100 Ω Notes on the Noise Canceler The noise canceler characteristics have been improved by implementing the circuit that determines the gate time in logic. Since the time constant in earlier noise cancelers was determined by an RC circuit such as that shown in figure 52, the rise time shown in figure 53 was influenced by the values of the resistor and capacitor used. As a result the noise exclusion efficiency was reduced by this delay in the rise time. In the LA1784M, this rise time was shortened by implementing the circuit that determines the gate time in logic, allowing it to reliably exclude noise. A11772 A11771 Fig. 52 Fig. 53 No. 6039-41/50 LA1784M Gain Distribution (FM) This section investigates the gain in each block in the LA1784M when the Sanyo recommended circuits are used. (Test conditions) Ambient temperature: 26°C Antenna and mixer input frequency: 98.1 MHz First and second IF input frequency: 10.7 MHz The input levels when VSM = 2 V will be as follows. ANT IN: 19 dBµ MIX IN: 30 dBµ 1st IF IN: 42 dBµ 2nd IF IN: 60 dBµ When the gains for each block are determined according to the above, the results are as follows. RF GAIN: 11 dB MIX GAIN: 12 dB 1st IF GAIN: 18 dB 1st IF IN 56 pin FM MIX IN 64 pin RF ANT IN 2nd IF IN 51 pin 11 dB 12 dB 18 dB A11773 Fig. 54 No. 6039-42/50 LA1784M (AM) This section investigates the gain in each block in the LA1784M when the Sanyo recommended circuits are used. (Test conditions) Ambient temperature: 26°C Antenna and mixer input frequency: 1 MHz First and second mixer input frequency: 10.7 MHz Second IF input frequency: 450 kHz The gains at each stage will be as follows. RF Gain (ANT IN-pin62): 17 dB 1st MIX Gain (pin62-pin56): 8 dB 1st IF Gain (pin55-pin53): 15 dB AM 1st MIX 1st IF 2nd MIX 1st MIX Gain 1st IF Gain 2nd MIX Gain 2nd IF AM DET RF RF Gain 2nd IF Gain A11774 Fig. 55 No. 6039-43/50 LA1784M Input Circuits for Each Stage [FM] • Mixer input • First IF input 75 Ω 0.022 µF 75 Ω 63 300 Ω 0.022 µF 56 75 Ω 64 75 Ω VIN Actual measurement fr = 10.7 MHz A11776 A11775 • IF input 75 Ω 300 Ω 0.022 µF 51 330 Ω 75 Ω 50 0.022 µF fr = 10.7 MHz A11777 [AM] • First mixer input 50 Ω • Second mixer input 0.022 µF 62 50 Ω 50 Ω 0.022 µF 49 50 Ω fr = RF fr = 10.71 MHz (f2nd osc + 0.45 MHz) A11778 • IF input A11779 • Del input 50 Ω 0.022 µF 52 50 Ω 50 Ω IFT 0.022 µF 45 50 Ω fr = 450 kHz fr = 450 kHz A11780 A11781 No. 6039-44/50 LA1784M Sample AM tuner Circuit with the LC72144 Used Together IF 2nd MIX CF RF CF CF 450K 1st IF 300 Ω XBUFF LC72144 fosc A11782 AM 1st IF Step FM IF 1 fOSC 10.25 MHz 10.7 MHz 10 kHz, 11 kHz 10.7 MHz 2 fOSC 10.35 MHz 10.8 MHz 9 kHz, 10 kHz 10.8 MHz 1st MIX 10.71 MHz CF RF IF CF 10 kΩ CF AF 62 59 60 56 53 49 54 1st OSC 52 2nd OSC 31 10.26 MHz 10.7 MHz RF 63 64 60 59 NC MPX Lch Rch IF CF CF 56 53 Quadrature detector AF 51 A11783 No. 6039-45/50 LA1784M Crystal Oscillator Element Kinseki, Ltd. Frequency: 10.26 MHz CL: 20 pF Model No.: HC-49/U-S Coil Specifications Sumida Electronics, Ltd. [AM Block] AM FILTEER (A286LBIS-15327) AM OSC (V666SNS-213BY) S 1 2 3 4 3 2 6 4 1 AM IF1 (7PSGTC-5001A=S) 3 AM IF2 (7PSGTC-5002Y=S) 2 1 6 1 S S S AM loading (269ANS-0720Z) 4 6 AM ANT IN (385BNS-027Z) 4 3 2 1 4 3 4 S 2 3 6 2 6 1 S 6 S AM RF amplifier (187LY-222) 0.1ø2UEW [FM Block] FM RF (V666SNS-208AQ) FM ANT (V666SNS-209BS) S 3 4 2 1 4 3 2 6 1 6 S FM OSC (V666SNS-205APZ) S FM MIX (371DH-1108FYH) S 3 4 3 C1 4 8 2 2 7 1 6 S 1 C2 6 S FM DET (DM6000DEAS-8407GLF) S S 3 4 2 1 6 No. 6039-46/50 LA1784M The Toko Electric Corporation [AM Block] AM FILTEER AM OSC 4 3 1 2 3 2 6 0.1ø2UEW 1 6 4 AM IF1 AM IF2 4 3 4 3 2 2 6 0.05ø3UEW 1 AM loading AM ANT IN 4 3 6 0.05ø3UEW 1 4 3 2 2 6 0.05ø3UEW 1 6 0.06ø3UEW 1 AM RF amplifier 0.1ø2UEW [FM Block] FM RF FM ANT S 3 4 4 3 2 ø0.1–2UEW 2 ø0.1–2UEW 6 S 1 6 S 1 FM OSC 3 FM MIX S 3 4 2 5 1 6 S 4 2 1 ø0.07–2UEW ø0.12–2UEW 6 S FM DET 3 4 2 1 6 0.07ø2MUEW No. 6039-47/50 First IF output — dBµ Mixer output — dBµ DCV — V Output, noise, AM output — dB Output, noise — dB Total harmonic distortion, THD — % HCC, SNC, RF AGC, muting voltage, S-meter voltage, VSM — V Output, noise, AM output, LR output — dB LA1784M Antenna input — dBµ Mixer input — dBµ Antenna input — dBµ Antenna input — dBµ Antenna input — dBµ Input — dBµ Input — dBµ First IF input — dBµ No. 6039-48/50 First IF output — dB First IF output — dB LA1784M Frequency, — MHz Antenna input — dBµ S/N, AM output — dB AGC on, separation, input level — dBµ Frequency, — MHz Ambient temperature, Ta — °C Ambient temperature, Ta — °C AM I/O Characteristics 20 Output, noise — dB Separation, Sep — dB 0 VCC = 8.5 V f = 1 MHz mod = 1 k 30% OUT –20 –40 NOISE –60 –80 –100 –20 0 M VS 1.0 20 40 60 80 ANT input, IN — dBµ 100 140 120 140 4.0 3.0 2.0 z 30% 5.0 fm = 1 kH 3.0 6.0 z 80% IF AGC 0 120 VCC = 8.5 V f = 1 MHz mod = 1 k 30% 80% fm = 1 kH 4.0 Total harmonic distortion, THD — % AGC, S-meter voltage — V 5.0 0 –20 100 AM Distortion 6.0 2.0 80 7.0 VCC = 8.5 V f = 1 MHz RF AGC 60 ANT input, IN — dBµ AM DC Characteristics 7.0 40 20 Ambient temperature, Ta — °C 1.0 0 –20 0 20 40 60 80 100 120 140 ANT input, IN — dBµ No. 6039-49/50 LA1784M 0 –20 40 dBµ desire mod 60 dBµ OFF 80 µ dB µ 100 dB 50/3Ω –60 –80 40 50Ω fD=1MHz fm=1kHz 30% 60 80 Bµ 30Ω 50Ω 50/3Ω VIN 65pF fu=1040kHz fm=400Hz 30% JIS ANT. DUMMY 100 120 140 60 dBµ 80 dBµ –20 40 dBµ –40 15pF ANT IN 50/3Ω ANT input, IN — dBµ 40 d –60 –80 40 desire mod OFF Bµ 80 dBµ 100 dBµ desire mod ON dB µ µ 60 dBµ ∆400kHz 0d 100 dBµ desire mod ON AM Second-Channel Interference Rejection Characteristics 10 ∆40 kHz 40 dB –40 20 80 Output, noise — dB 0 AM Second-Channel Interference Rejection Characteristics Output, noise — dB 20 60 dBµ 50/3Ω fD = 1 MHz fm = 1 kHz 30% 60 50Ω 80 15pF ANT IN 50/3Ω 30Ω 50Ω 50/3Ω VIN 65pF fu = 1400 kHz fm = 400 Hz 30% JIS ANT. DUMMY 100 120 140 ANT input, IN — dBµ Specifications of any and all SANYO 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. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or 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 products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use. 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 June, 2001. Specifications and information herein are subject to change without notice. PS No. 6039-50/50