NJM2259 - 1 - rf modulator for uhf band ? ? ? ? description the NJM2259 is a rf modulator ic especially designed for uhf band rf modulator and consists of video clamp circuit, white clip circuit, video am modulator and audio fm modulator, built into one chip. ? ? ? ? features ? operating voltage 5v ? picture-to-sound ratio is adjustable ? audio ripple is decreased by two internal regulators ? audio input circuit with low shock noise ? carrier-off switch function on chip ? bipolar technology ? package outline : dmp16 ? ? ? ? block diagram ? ? ? ? package outline NJM2259m 1 lpf regulator video clamp gnd 3 white clip rf oscillator regulator rf mixer gnd 2 osc b1 osc e1 osc e2 osc b2 vcc 2 vcc 3 5 4 3 2 8 7 6 16 12 13 14 15 9 10 11 audio in tank 1 tank 2 p/s adj. vcc 1 video in gnd 1 rf out audio subcarrier mo dulato r
NJM2259 - 2 - ? ? ? ? absolute maximum ratings (t a =25c) parameter symbol ratings unit supply voltage v cc 7 v power dissipation p d 300 mw input voltage v i -0.3 to v cc v operating temperature range t opr -20 to +75 c storage temperature range t stg -40 to +125 c ? ? ? ? recommended operating voltage range (t a =25c) parameter condition symbol min. typ. max. unit operating voltage v cc 4.5 5.0 5.5 v ? ? ? ? electrical characteristics (v cc =5v,t a =25c) parameter condition symbol min. typ. max. unit operating current no video/audio input signal i cc 18 30 32 ma video output level (note 1) video input signal (pin11)=0.5v pp v o (73) 78 (83) dbu video modulation depth (note 1) video input signal (pin11)=0.5v pp mp (60) 75 (90) % video limiter modulation depth (note 1) video input signal (pin11)=0.5v pp mpmax (80) 94 (98) % differential gain video input signal (pin11)=0.5v pp staircase dg - 3 - % differential phase video input signal (pin11)=0.5v pp staircase dp - 3 - deg picture-to-sound ratio (note 1) video input signal (pin11)=0.5v pp ps (10) 13 (16) db sound fm modulation depth (note 1) audio input signal (pin16)=70mv pp 100%=50khz dev. ms (85) 100 (115) % audio distortion ms=100%,1khz sine wave thd - 0.3 - % audio signal-to-noise ratio ms=100%,1khz sine wave video input signal (pin11)=1v pp asn - 60 - db maximum sound fm modulation audio input signal (pin16)=500mv pp 1khz sine wave msmax - 700 - % (note 1) because ac characteristics largely depends on application circuit, dc test is applied these parameters.
NJM2259 - 3 - ? ? ? ? test circuit vc c gnd2 reg out video in osc b1 gnd1 p/s adj. audio in 16 tank2 vc c2 gnd3 osc e1 osc e2 osc b2 15 14 13 12 11 10 9 1 2 3 4 5 6 8 7 vc c3 vc c3 tank1 + 6p 1u 100p 3p 1p 3p 100p 100p 1p 22p 22p 50k 50k 68p audio in rf out vc o video in
NJM2259 - 4 - ? ? ? ? terminal characteristics no. symbol typ. dc voltage (v) equivalent circuit function 1 gnd 3 - gnd for rf osc amp 2 gnd 2 - gnd for rf osc 3 4 5 6 osc b1 osc e1 osc e2 osc b2 2.55 1.75 1.75 2.55 rf oscillator 7 vcc 2 - rf osc regulator power supply 8 vcc 3 - rf mixer power supply 9 rf out 3.95 rf mixer output 10 gnd 1 - gnd terminal except for rf oscillator 11 video in 1.70 video signal input
NJM2259 - 5 - no. symbol typ. dc voltage (v) equivalent circuit function 12 vcc 1 - power supply 3.55 tank 1: h 13 p/s adj. 2.80 tank 1: l picture-to-sound ratio adjust 14 tank 2 h : 3.60 l : 2.85 15 tank 1 h : 3.60 l : 2.85 sound fm modulation circuit 16 audio in - audio signal input
NJM2259 - 6 - ? ? ? ? typical characteristics t a =25c icc vs vcc 0 5 10 15 20 25 30 35 40 45 50 4.0 4.5 5.0 5.5 6.0 6.5 7.0 vc c [ v ] icc [ m a ] video output level vs vcc 74 76 78 80 82 84 4.0 4.5 5.0 5.5 6.0 6.5 7.0 vcc [ v ] vo [ dbuv ] video modulation depth vs vcc 70 72 74 76 78 80 4.0 4.5 5.0 5.5 6.0 6.5 7.0 vcc [ v ] mp [ % ] audio fm modulation depth vs vcc 75 80 85 90 95 100 105 110 115 120 125 4.0 4.5 5.0 5.5 6.0 6.5 7.0 vcc [ v ] b [ % ]
NJM2259 - 7 - ? ? ? ? outline drawing dmp16 [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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