NTE7200 Intergrated Circuit FM Stereo Transmitter Description: The NTE7200 is a monolithic intergrated circuit in an 18-Lead DIP type package designed for use as a stereo transmitter. This device consists of a stereo modulator that creates stereo composite sig‐ nals, an FM modulator that creates FM signals, and an RF amplifier. The stereo modulator develops composite signals made up of a MAIN (L+R) signal, a SUB (L-R) signal and a pilot (19kHz) signal using 38kHz crystal oscillators. The FM modulator has carriers on the FM broadcast band (75 to 108MHz). The RF amplifier transmits the stereo encoded FM signals and is also a buffer for the FM modulator. The stereo transmitter is equipped with a constant voltage pin for a variable capacitor that is used to finly adjust the FM frequency. Features: D Low Operating Voltage Range (1.0V to 2.0V) D Low Power Consumption (3mA Typ) D Few External Components Required Applications: D FM Stereo Transmitters D Wireless Microphones Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V Power Dissipation, Pd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12mW/°C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25 ° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50 ° to +125°C Recommended Operating Conditions: (TA = +25°C unless otherwise specified) Parameter Power Supply Range Symbol VCC Test Conditions Min Typ Max Unit 1.0 1.25 2.0 V Electrical Characteristics: (TA = +25°C, VCC = 1.25V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 0.5 3.0 5.0 mA Quiescent Current IQ Input Impedance ZIN fIN = 1kHz 360 540 720 Ω Input/Output Gain GV VIN = 0.5mV 30 37 - dB Channel Balance CB VIN = 0.5mV - - 2 dB Multiplexer Output Voltage VOM THD ≤ 3% 200 - - mVpk- pk Multiplexer 38kHz Leakage VOO No Signal - 1 - mV Pilot Output Voltage VOP No Load 460 580 - mVpk- pk Channel Separation Sep With a Standard Demodulation 25 45 - dB Input Conversion Noise Voltage VNIN IHF- A when 38kHz is Terminated - 1 - μVrms RF Output Voltage VOSC 350 600 - mVrms Pin Connection Diagram R-Ch Audio Input 1 18 L-Ch Audio Input Input Amp Bypass 2 17 Multiplexer Modulator Balance AF GND 3 16 Multiplexer Modulator Balance 38kHz OSC Bypass 4 15 VCC 38kHz OSC 5 14 Multiplexer Signal Output 38kHz OSC 6 13 Pilot Signal Output RF Output 7 12 Modulation Signal Input RF GND 8 11 VREF RF OSC 9 10 RF OSC 18 10 1 9 .256 (6.5) .902 (22.9) .156 (3.96) .129 (3.29) .100 (2.54)