NTE1533 integrated circuit am tuner for car radio description: the NTE1533 is developed for tuning am on a car radio. it uses low voltage oscillation to achieve varactor diode tuning instead of variable inductance tuning. functions: an rf amplifier a mixer an oscillator with automatic level control (alc) an if amplifier a detector normal agc wide band agc on an rf amplifier features: double balanced mixer: recovers if and spurious interference. normal agc: less influence of detector output against varying input. rf wide band afc: low operating level (300mv rms ) recovers intermodulation distortion, large input characteristic at tuning case of varactor diodes. agc driving output to fet: applies agc to the input fet at varactor diode tuning. automatic level control at oscillator: recovers a tracking error because an oscillation out- put is stabilized at low voltage level (350mv rms ) for varactor diode tuning. reference voltage output: 5.6v reference voltage for other uses. compensation for v cc error: lower gain error and distortion over 7.5v to 16.0v. lower ripple voltage: less modulation of carrier by supply voltage ripples. low pop noise: of time constant of agc at v cc on and mode switch on. absolute maximum ratings : (t a = +25 c unless otherwise specified) maximum supply voltage (pin7, pin13), v ccmax 16v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maximum output voltage (pin5), v o5 17v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maximum output voltage (pin8, pin11), v o8 , v o11 24v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maximum input voltage (pin2), v imax 5.6v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maximum supply current (pin5, pin7, pin8, pin11, pin13 summed), i ccmax 35ma . . . . . . . . . . . . . . maximum flow out current (pin3), i 3 6ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . allowable power dissipation (t a +45 c) , p dmax 520mw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating temperature range, t opg ? 20 to +70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg ? 40 to +125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
recommended operation condition : (t a = +25 c unless otherwise specified) supply voltage, v cc 7.5 to 14.0v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . electrical characteristics: (t a = +25 c, v cc = 8v, f r = 1mhz, f m = 400hz unless otherwise specified) parameter symbol test conditions min typ max unit current dissipation i cc quiescent 12.5 18.0 24.5 ma 120dbu input 14.0 20.0 26.5 ma detector output v o 24dbu input, 30% mod. ? 31.0 ? 26.5 ? 22.0 dbu 74dbu input, 30% mod. ? 18.0 ? 15.5 ? 12.0 dbu signal ? to ? noise ratio s/n 24dbu input, 30% mod. 16 20 ? db 74dbu input, 30% mod. 46 50 ? db total harmonic distortion thd 74dbu input, 30% mod. ? 0.35 1.0 % 74dbu input, 80% mod. ? 0.35 1.5 % 120dbu input, 30% mod. ? 0.35 2.0 % rf agc voltage for reference v 16 quiescent 5.2 5.6 5.9 v signal ? to ? noise ratio s/n 35dbu input, 30% mod. ? 31 ? db total harmonic distortion thd 128dbu input, 80% mod. ? 0.58 ? % detector output drift ? v o (120dbu)/v o (74dbu) ? 0.4 ? db bandwidth 6db width, 15dbu input 30% mod. ? 7 ? khz 60db width, 15dbu input 30% mod. ? 30 ? khz selectivity (1 signal) aca 10khz off tuning, 15dbu input, 30% mod. ? 40 ? db ripple rejection ratio 100dbu input, if v cc (pin13) ripple level 50hz ? 15dbm ? 40.5 ? db local oscillation voltage v osc ? 350 ? mv rms local osc drift ? v osc v oscl (515khz) ? v osch (1660khz) ? 20 ? mv rms whistle, 2 fitweet 74dbu input, 400hz beat max. ? ? 33 ? db rf agc voltage v 16 120dbu input ? 1 ? v rf output voltage v orf 100dbu input, 10khz ? 300 ? mv rms if rejection ratio f r = 600khz, 15dbu input ? 91.5 ? db image rejection ratio f r = 1400khz, 15dbu input ? 70.5 ? db
v ref rf v cc if v cc rf bypass rf agc if 1 output agc input mixer input rf input mixer output if 1 input osc gnd rf output 10 9 8 7 6 5 4 3 2 1 15 14 13 12 11 16 detector output if 2 input pin connection diagram (front view) .125 (3.17) 1 16 .953 (24.1) .334 (8.48) .059 (1.5) .118 (3.0) .127 (3.2) .257 (6.5)
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