NJM2295A -1- ver.2003-12-09 fm if ic for remote keyless entry system general description package outline the NJM2295A is fm if ic for the remote keyless entry system (rke). it includes almost all functions of if blocks, from the 1st. mixer to the wave shaving circuit. exclusively designed NJM2295A is suited not only for the rke, but for other fm signal receivers. features low operating current 5ma typ. at v + =5v low operating voltage +2.7v to 7.0v local oscillation frequency 50 to 350mhz mixer active frequency to 450mhz if frequency if=10.7mhz 1st. mixer included rssi circuit included fsk wave shaping circuit bipolar technology package outline ssop20 block diagram NJM2295Av
NJM2295A - 2 - ver.2003-12-09 absolute maximum ratings (t a =25c) parameter symbol ratings unit supply voltage v + 9.0 v power dissipation p d 300 mw operating temperature range t opr -40 to +85 c storage temperature range t stg -40 to +125 c electrical characters (v + =5.0v, t a =25c, fmod=1khz, fmix=320mhz, fif=10.7mhz, fdev=10khz) parameter symbol test condition min. typ. max. unit supply voltage v + 2.7 - 7.0 v no signal operating current i ccq - 5.0 7.5 ma battery saving operating current i ccs - - 10 a mixer gain 1 gmix1 rl=no connect. 13.5 18.5 22.5 db mixer gain 2 gmix2 320mhz gain - 450mhz gain - 1 3 db mixer sept point ip - 103 - dbvemf mixer input resistance r in m f=320mhz - 1 - k ? mixer input capacity c in m f=320khz - 2 - pf mixer output resistance r o m - 330 - ? if amplifier input resistance r in if - 330 - ? signal to noise ratio 1 s / n1 mixer input, v in =80dbvemf - 60 - db signal to noise ratio 2 s / n2 if input, v in =80dbvemf - 60 - db signal to noise ratio 3 s / n3 if input, v in =35dbvemf - 25 - db -3db limiting sensitivity slim mixer input - 22 27 dbvemf demodulated output level vod if input, v in =60dbvemf 80 150 - mvrms am rejection ratio amr if input, v in =80dbvemf, am=30% - 50 - db duty ratio of wave shaped output dr if input, v in =60dbvemf 40 50 60 % rssi output voltage 1 rssi1 if input, v in =20dbvemf 0.35 0.55 0.70 v rssi output voltage 2 rssi2 if input, v in =60dbvemf 0.7 1.00 1.3 v rssi output voltage 3 rssi3 if input, v in =100dbvemf 1.30 1.75 2.15 v rssi output resistance rssir - 48 - k ? quick charge / discharge current ich 35 70 120 a low level output voltage of fsk-out vfskl il=100a - 0.1 0.4 v high level leak current of fsk-out terminal ifskh - - 2 a
NJM2295A - 3 - ver.2003-12-09 application circuit
NJM2295A - 4 - ver.2003-12-09 terminal function pin no. symbol function equivalent circuit 1 osc in saw is oscillation input terminal. 2 osc out oscillation output terminal. 19 mix in mixer input terminal. input impedance : parallel resistance : 1k ? parallel capacity : 2pf 4 mix out output terminal for mixer. output resistance is 330 ? at typical. 6 if in limiter input terminal. input resistance is 330 ? at typical. 7 dec decoupling terminal for bias.
NJM2295A - 5 - ver.2003-12-09 terminal function pin no. symbol function equivalent circuit 9 lim out output terminal for limiter amplifier. typical input impedance is 300 ohms. 10 quad in input terminal of a quadrature detection circuit. connect with a ceramic discriminator. 14 rssi out rssi output terminal. 11 af out demodulated siganl output. 12 lpf in input terminal of a low pass filter. this terminal is biased from the af-out terminal (11pin) through an external rc filter.
NJM2295A - 6 - ver.2003-12-09 terminal function pin no. symbol function equivalent circuit 13 lpf out output terminal of a low pass filter. 8 fsk ref reference input terminal of a wave shaping comparator. connected with an external capacitor. 17 fsk out output terminal of a wave shaping circuit. the wave shaped signal inverted for the lpf output comes out. 15 bs control terminal of a battery saving circuit. h : this circuit is on. l : this circuit is off. 16 charge control terminal of a quick charge / discharge circuit. h : this circuit is on. l : this circuit is off. 5 v + 1 on and ;after if supply voltage. - 3 gnd1 on and after if ground. - 20 v + 2 supply voltage for mixer and osc. - 18 gnd2 ground for mixer and osc - [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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