BH4126FV

BH4126FV Communication ICs Wide band IF detector for RF remote control units BH4126FV The BH4126FV is an IC equipped with internal mixer, IF amplifier, and FM detector circuits, developed for use with RF remote control units. !Applications Keyless entry !Features 1) Equipped with internal mixer, IF, RSSI, and FM detection circuits. 2) Can be operated at mixer input frequencies ranging from 20MHz to 300MHz. 3) Equipped with a battery power saving function. 4) Fast RSSI response. 5) High FM detection sensitivity. (21.2mV / kHz) BH4126FV Communication ICs !Block diagram VCC IF input FM detector output RSSI IF output 16 15 14 13 12 11 10 9 VCC Quadrature DET. RSSI IF Local OSC. VCC 1 2 3 4 5 6 7 8 Local Battery save VCC !Absolute maximum ratings (Ta=25°C, for measurement circuit) Parameter Power supply voltage Power dissipation Storage temperature Symbol VCC PD Tstg Limits 7.0 350 *1 Unit V mW ˚C -55~+125 *1 Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C. !Operating range Parameter Operating power supply voltage Operating temperature Symbol VCC Topr Limits 2.3~5.5 -40~+85 Unit V ˚C BH4126FV Communication ICs !Pin descriptions Pin No. Function Local oscillator pin (base) VCC Internal peripheral circuit DC voltage(V) 1 Connect crystal resonator and capacitor 5k VCC - 0.6 1 Local oscillator pin (emitter) 2 To MIXER 2 Connect capacitor or input local signal from external oscillator VCC Battery save pin "Pin 3 voltage" ≤ 0.2 : ...