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| NTE722 Integrated Circuit FM Stereo Multiplex Decoder Description: The NTE722 is a monolithic FM Stereo Multiplex Decoder System in a 14-Lead DIP type package. This integrated circuit demodulated a stereo multiplex signal into the right and left audio channels while inherently suppressing SCA frequency components. Internal provision is made for driving an external stereo mode indicator lamp. The excellent performance and wide supply range requirement make the NTE722 suitable for all line-operated and automotive FM stereo multiplex applications. Features: D 45dB Channel Separation D 55dB Storcast Rejection without SCA Filters D High Current Stereo Indicator Lamp Driver D Operation with 8V to 14V Supplies Absolute Maximum Ratings: Supply Voltage (Note 1), V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Voltage at Stereo Lamp Driver Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22V Current into Stereo Lamp Driver Terminal (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Internal Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 670mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125C Lead Temperature (During Soldering, 10sec max), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C Note 1. Power supply transients up to 22V are permissible for periods of 15 seconds. However, extended operation at voltages greater than 15V should be avoided as the maximum allowable internal power dissipation for this device may be exceeded. Note 2. Rating applies to steady state current. Maximum permissible surge current during turn-on of the Stereo Indicator Lamp is 500mA. Electrical Characteristics: (TA = +25C V+ = 12V, 200mVRMS standard stereo multiplex signal applied to input, Note 3 unless otherwise specified) Parameter Supply Current Input Resistance Stereo Separation f = 100Hz f = 1kHz f = 10kHz Channel Balance (Monaural Input) Total Harmonic Distortion Voltage Gain 67kHz Storecast Rejection 19kHz Pilot Level Required at Input High Frequency Audio Components in Left and Right Outputs (dB Below 1kHz Output) Note 4 Stereo Indicator Lamp ON Stereo Indicator Lamp OFF 19kHz 38kHz Test Conditions Min - 12 - 30 20 - - - - - 4.0 - - Typ 12 20 40 45 40 0.2 0.5 1.0 55 12 8.0 30 25 Max 18 - - - - - 1.0 - - 22 - - - Unit mA k dB dB dB dB % V/V dB mVRMS mVRMS dB dB Note 3. "Standard Stereo Multiplex Signal" here refers to a 200mVRMS (0.56VP-P) composite stereo signal including 10% pilot with L = 1 and R = 1 as described in the FCC Rules of FM Broadcasting. Note 4. Measured with a stereo composite signal consisting of 80% stereo, 10% pilot and 10% SCA as defined in the FCC Rules on FM Broadcasting. 14 8 Pin Connection Diagram 1 19kHz Filter 19kHz Filter MPX Input N.C. N.C. Stereo Lamp GND 1 2 3 4 5 6 7 14 Decoupling 13 38kHz Filter 12 Right Output 11 Left Output 10 38kHz Filter Bias 9 8 V+ N.C. .785 (19.95) Max .300 (7.62) 7 .200 (5.08) Max .100 (2.45) .600 (15.24) .099 (2.5) Min |
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