engineering division 06/09/25 p. 1/2 tel:+81-3-3437-3570 fax:+81-3-3437-5622 http://www.niigata-s.co.jp confidential subject to change without notice NS741 catalog NS741 is the low-power fm band transmitter with whi ch the left and right audio signals can be modulate d in fm with stereo multiplexing. 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. i 2 c or 3-wire can be applied to the interface with cpu. applications: wireless microphone portable cd and mp-3 mobile phone note: set the transmission output based on the law, regulations, etc. of respective areas. features: 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 components crystal oscillator: 32.768khz external reference frequency input, available (19.2 and 32.768 khz) built-in mos varactor for local oscillator modulation index, adjustable by mpu i 2 c 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: 17ma (typ.) operating temperature: -30 to +85 degc package: 35-pin wafer level package and 36-pin qfn package full cmos process rf output program, variable (apc) electrical specification: operating range parameter sym condition min typ max unit operating voltage vdd 2.7 3.0 3.6 v vex 1.7 1.8 3.6 v operating temperature ta -30 +85 degc storage temperature tstg -40 +125 degc electrical performance unless otherwise specified, conditions are: vdd: 3. 0+/-0.05v, ta: 25degc, f-af: 400hz, vi-af: 140mvrms , alc: off, fo: 88mhz. parameter sym condition min typ max unit consumption current idd vdd: 3.0v po: rfg=0 - 17 27 ma standby current istb vdd: 3.6v - - 20 ua transmission frequency ftx 76.1 - 108.0 mhz rfg: 0 -7 -2 1 rfg: 1 -3 0 3 rfg: 2 -1 2 5 transmission power output po rl: 50-ohm rfg: 3 1 4 7 dbm modulation deviation dev pre-emphasis: on mono alc: off +/-60 +/-75 +/-100 khz modulation distortion thd stereo dev: +/-75khz alc: off - - 1.5 % modulation sn ratio snr mono and stereo alc: off 47 53 - db stereo separation sep dev: +/-75khz alc: off 25 30 - db audio frequency response fr f = 50 to 15khz vin=18 mvrms -3 0 +3 db audio input impedance zaf f = 50 to 15khz vin=18mvrms 100 - - k ohm pilot tone level pl 10 % rds level rds 2 khz frequency fxt 32.768 khz crystal oscillator absolute tolerance dxt ta: -30 to 85degc vdd: 2.7 to 3.6v -20 +20 ppm
engineering division 06/09/25 p. 2/2 tel:+81-3-3437-3570 fax:+81-3-3437-5622 http://www.niigata-s.co.jp confidential subject to change without notice adc dac lpf & mod.level adjuster lin rin grf vrf capc tea vaf gaf power amp x1 x2 1.8v reg data latch frequency synthesizer cp1 vt glo os2 os1 local osc rfo gndc vddr creg cp2 iic da variable gain control amp. stereo generator vdd vdd vdd 32.768khz system clock generator gndg gxt vex vex teso cb 19.2mhz clo audio input 3-wire & iic serial interface ck rdint f192 to/from mpu la NS741 block diagram antenna *add, if necessary 3-wire i 2 c i 2 c i 2 c pin assignment: wlp (top view) outline dimension: 2.93 x 2.93 mm ball pitch: 0.5mm ball size: 0.25mm (pb free) qfn (bottom view) # name # name 1 cb 19 rst 2 gxt 20 teso 3 x1 21 vex 4 x2 22 cp1 5 gndc 23 vt 6 cp2 24 glo 7 vddr 25 os2 8 creg 26 os1 9 gndg 27 clo 10 f192 28 grf 11 iic 29 rfo 12 rdint 30 vrf 13 la 31 capc 14 ck 32 tea 15 da 33 vaf 16 connect to ground 34 gaf 17 connect to ground 35 rin 18 connect to ground 36 lin # name # name a1 lin d1 capc a2 gxt d2 vrf a3 x1 d3 tea a4 gndc d4 vt a5 vddr d5 connect to ground a6 gndg d6 da b1 rin e1 rfo b2 cb e2 clo b3 x2 e3 os2 b4 creg e4 vex b5 iic e6 connect to ground b6 f192 f1 grf c1 vaf f2 os1 c2 gaf f3 glo c3 cp2 f4 cp1 c4 rdint f5 teso c5 ck f6 connect to ground c6 la 65 4 3 2 1 b c d e f a
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