NS741 Datasheet | Niigata Seimitsu

.. Engineering Division TEL:+81-3-3437-3570 FAX:+81-3-3437-5622 http://.niigata-s.co.jp 06/09/25 P. 1/2 NS741 Catalog NS741 is the low-power FM band transmitter with which the left and right audio signals can be modulated in FM with stereo multiplexing. Features : Chip Description: NS741 is the low-power FM band transmitter which enables the RDS (Radio Data System) data transmission. It is manufactured by full CMOS process. The built-in DSP realizes stable stereo signal generation and RDS data attachment. The direct modulation (the modulation by directly providing the audio signal to the MOS varactor which constitutes the resonant circuit of the local oscillation circuit) is employed. I2C or 3-wire can be applied to the interface with CPU. Transmitting frequency coverage: 76.1 to 108.0 MHz Stereo modulation Direct Frequency Modulation RDS transmission, available ALC (Automatic Level Control) function in Analog input Less external ponents Crystal oscillator: 32.768k Hz External reference frequency input, available (19.2 and 32.768 k Hz) Built-in MOS Varactor for local oscillator Modulation index, adjustable by MPU I2C bus or 3-wire serial interface with MPU Easy control of software programming Operating Voltage: 2.7 to3.6V (3.0V typ.) Low Power Consumption: 17m A (typ.) Operating Temperature: -30 to +85 deg C Package: 35-pin Wafer Level Package and 36-pin QFN Package Full CMOS process RF output program, variable (APC) Applications: Wireless microphone Portable CD and MP-3 Mobile phone Note: Set the transmission output based on the law, regulations, etc. of respective areas. Electrical Specification: Operating Range Parameter Operating voltage Operating temperature Storage temperature Sym VDD VEX Ta Tstg Sym Idd Istb f TX PO Condition Min 2.7 1.7 -30 -40 Min 76.1 -7 -3 -1 1 +/-60 47 25 -3 100 Typ 3.0 1.8 Max 3.6 3.6 +85 +125 Max 27 20 108.0 1 3 5 7 +/-100 1.5 +3 Unit V V deg C deg C Unit m A u A MHz d Bm Electrical Performance Unless otherwise...