NTE7200

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 1.0 Typ 1.25 Max 2.0 Unit V Electrical Characteristics: (TA = +25°C, VCC = 1.25V unless otherwise specified) Parameter Quiescent Current Input Impedance Input/Output Gain Channel Balance Multiplexer Output Voltage Multiplexer 38kHz Leakage Pilot Output Voltage Channel Separation Input Conversion Noise Voltage RF Output Voltage Symbol IQ ZIN GV CB VOM VOO VOP Sep VNIN VOSC Pin Connection Diagram R-Ch Audio Input Input Amp Bypass 1 2 18 L-Ch Audio Input 17 Multiplexer Modulator Balance 16 Multiplexer Modulator Balance 15 VCC 14 Multiplexer Signal Output 13 Pilot Signal Output 12 Modulation Signal Input 11 VREF 10 RF OSC Test Conditions fIN = 1kHz VIN = 0.5mV VIN = 0.5mV THD ≤ 3% No Signal No Load With a Standard Demodulation IHF- A when 38kHz is Terminated Min 0.5 360 30 200 460 25 350 Typ 3.0 540 37 1 580 45 1 600 Max 5.0 720 2 - Unit mA Ω dB dB mVpk- pk mV mVpk- pk dB μVrms mVrms AF GND 3 38kHz OSC Bypass 4 38kHz OSC 5 38kHz OSC 6 RF Output 7 RF GND 8 RF OSC 9 18 10 1 9 .902 (22.9) .156 (3.96) .129 (3.29) .100 (2.54) .256 (6.5)