Ordering number : ENA2052 LA1225MC Monolithic Linear IC FM IF Detector IC http://onsemi.com Overview The LA1225MC is a Low-voltage operation (1.8V or higher) FM IF detector IC for the electronic tuning system. Features • Low-voltage operation (1.8V or higher) • Supports electronic tuning systems (provides built-in SD output and IF count output functions) • FM detector circuit accepts an even wider input frequency range. (Supports the use of an external phase capacitor.) • Miniature package: SOIC10 Functions • IF amplifier • Quadrature detector • Signal meter • SD • IF buffer Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings VCC max Pd max Ta ≤ 85°C Unit 9.0 V 100 mW Operating temperature Topr -20 to +85 °C Storage temperature Tstg -55 to +150 °C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Operating supply voltage range VCC op Semiconductor Components Industries, LLC, 2013 May, 2013 Conditions Ratings Unit 3.0 V 1.8 to 8.0 V 41812 SY 20120411-S00004 No.A2052-1/8 LA1225MC Operating Characteristics at Ta = 25°C, VCC = 3.0V, fC = 10.7MHz Ratings Parameter Symbol Current drain Conditions ICCO Signal-to-noise ratio typ Unit max No input 3.0 4.0 5.0 mA VO 100dBμV, 100% mod., fm = 1kHz 70 150 220 mV THD 100dBμV, 100% mod., fm = 1kHz 0.5 0.8 % 37 dBμV Demodulator output Total harmonic distortion min S/N 100dBμV, 100% mod., fm = 1kHz 65 73 100dBμV, 100% mod., 19 28 dB 3dB sensitivity -3dBL.S SD sensitivity SDON 0% mod. 35 50 65 dBμV IF counter buffer output VIFBuff 100dBμV 90 130 170 mV fm = 1kHz output reference, when the input is -3dB Package Dimensions Unit : mm 3426 5.0 5 0.35 1.75 MAX 0.15 1.5 1.0 0.175 1 0.835 0.37 6.4 6 4.4 10 SANYO : SOIC10 No.A2052-2/8 LA1225MC Block Diagram and Test Circuit STRQ IF Buff DET OUT SD 10 9 8 SD IF Buff 7 6 DET IF Amp S-METER Reg GND 2 3 1 VCC 4 5 FM IF IN + VSM + VCC + Sample Application Circuit 3.3k SD STRQ 10k IF Buff 0.047μF 3.0V DET OUT DETcoil; YT-30103 3.9k 0.015 μF 1000pF 2pF 10 9 8 7 6 4 5 LA1225MC 1 2 3 330 FM IF IN 75 0.047μF 10μF + 0.047μF 1μF + VSM 15k 100μF + VCC = 3.0V 0.047μF No.A2052-3/8 LA1225MC Pin Functions No-Signal Voltage at VCC = 3.0V Pin No. Function No-signal voltage (V) 1 IF input 1.2 Equivalent circuit Notes Input impedance RIN = 330Ω 2 Reg 1.2 3 GND 0 4 S-meter output 0.1 Vreg = 1.2V Open collector output. The SD sensitivity can be adjusted with an external resistor connected to this pin. 5 VCC 3.0 6 Demodulated output 1.5 Output impedance ROUT = 3kΩ 7 DET 3.0 The detector coil is inserted between pin 7 and pin 5 (VCC). Continued on next page. No.A2052-4/8 LA1225MC Continued from preceding page. Pin No. Function No-signal voltage (V) 8 Limiter amplifier output 2.8 Notes Equivalent circuit Pin 8 and pin 7 (DET) are connected through a capacitor. 9 IF buffer 0 (Also used for control SW) The IF buffer output is turned on when the voltage applied to the pin is the recommended 1.5V or higher. 10 SD 1.6 This is an active-low output. This is an open-collector output and can directly drive an LED. (ICmax = 20mA) No.A2052-5/8 LA1225MC No.A2052-6/8 LA1225MC PS No.A2052-7/8 LA1225MC ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. 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SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PS No.A2052-8/8