MC3361BP linear integrated circuit 1 low voltage/power narrow band fm if description the contek MC3361BP is designed for use in fm dual conversion communication. it contains a complete narrow band fm demodulation system operable to less than 2.5v supply voltage. this low-power narrow-band fm if system provides the second converter, second if, demodulator. filter amp and squelch circuitry for communications and scanning receivers. features *low power consumption (4.0ma typ. at vcc=4.0v) *excellent input sensitivity (-3db limiting, 2.0 vrms typ.) *minimum number of external components required. *operating voltage:2.5~7.0v dip-16 sop-16 applications *cordless phone (for home use) *fm dual conversion communications equipment pin configuration 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 osc osc mixer output vcc limiter input decoupling quadrature input audio output filter input filter output scan control squelch input mute gnd rf input decoupling contek contek contek microelectronics co.,ltd. http://www.contek-ic.com e-mail:sales@contek-ic.com
MC3361BP linear integrated circuit 2 absolute maximum ratings (ta=25 c) parameter symbol value unit max. supply voltage vcc(max) 10 v supply voltage range vcc 2.5 to 7.0 v detector input voltage v i(det) 1.0 vp-p rf input voltage (vcc>=4.0v) v i(rf) 1.0 vrms mute function v mute -0.5 ~ + 5.0 vpeak operating temperature t opr -20 to +70 c storage temperature t stg -65 to +150 c note: absolute maximum ratings are those values beyond which permanent damage to the device may occur. these are stress ratings only and functional operation of the device at or beyond them is not implied. long exposure to these conditions may affect device reliability. electrical characteristics (vcc=4.0v, fo=10.7mhz, f=+-3khz,ta=25 c, unless otherwise specified) parameter symbol test conditions min typ max unit operating current icc squelch off (v12=2v) squelch on (v12=gnd) 4.0 6.0 ma input limiting voltage v i(lim) -3.0db limiting 2.0 v detector output voltage v o(det) 2.0 vdc detector output impedance z o(det) 400 audio output voltage v o vin=10mv 100 160 mvrms filter gain g v f=10khz,vin=5mv 40 48 db filter output dc voltage v o(dc) 1.5 vdc trigger hysteresis of filter v th 50 mv mute switch-on resistance r on(mute) mute low 10 mute switch-off resistance r off(mute) mute high 10 m scan control low output v l(scan) mute off (v12=2v) 0.5 vdc scan control high output v h(scan) mute on (v12=gnd) 3.0 vdc mixer conversion gain g v(mixer) 24 db mixer input resistance r i(mixer) 3.3 k mixer input capacitance c i(mixer) 2.2 pf contek contek microelectronics co.,ltd. http://www.contek-ic.com e-mail:sales@contek-ic.com
MC3361BP linear integrated circuit 3 application circuit in the above typical application, the audio signal is recovered using a conventional quadrature fm detector. the absence of an input signal is indicated by the presence of noise above the desired audio frequencies. this noise band: is monitored by an active filter and a detector. a squelch trigger circuit indicates the presence of noise (or a tone) by an output which can be used to control scanning. at the same time, an internal switch is operated which can be used to mute the audio. MC3361BP 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 455khz filter quad coil toko type rmc-2a6597hm scan control vcc vcc 0.1 10.245mhz 220p 68p 0.1 0.1 20k 102 470k 0.1 f 750 0.1 f 1n4148 120k 510 8.2k 0.01 f 0.01 f 10k 0.01 f audio out audio volume squelch sensitivity 68k 3.3 f 50k 51k rf input 51k 0.01 murata cfu 455d contek contek contek microelectronics co.,ltd. http://www.contek-ic.com e-mail:sales@contek-ic.com
|
