Communication ICs FM IF detector for cordless phones BA4116FV The BA4116FV is an IC with mixing circuit, IF circuit, FM detector circuit, RSSI circuit, and noise detector circuit. As it can operate at low voltages, it is ideal for use in cordless phones. Applications Cordless phones, amateur short wave radios, and other portable wireless equipment Features 1) Input frequencies of 10MHz to 150MHz can be accommodated. 2) Low-voltage operation. (1.8 to 5.5V) 3) Excellent temperature characteristic. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 52 4) High sensitivity; 12dB SINAD sensitivity = 8dBµVEMF (50 Ω) 5) High intercept point. (–11dBm) 6) Small package used. (0.65mm pitch) Communication ICs BA4116FV Block diagram 53 Communication ICs Pin descriptions 54 BA4116FV Communication ICs BA4116FV 55 Communication ICs 56 BA4116FV Communication ICs BA4116FV Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 2.0V, fIN (Mix) = 21.7MHz, fIN (IF) = 450kHz, ∆f = ±1.5kHzdev, fm = 1kHz, all AC levels open (EMF) display) 57 Communication ICs Measurement circuit 58 BA4116FV Communication ICs BA4116FV Application example 59 Communication ICs BA4116FV FAttached components FDetermining the filter amplifier constant (multi-layer recovery band pass filter) f0: Center frequency Q: Center frequency f0 / band width BW A0: I / O gain The reference resistance R0 is determined as C1 = C2 = C0. R0 = 1 / 2πf0 S C0 R1 = R0 S Q / A0 R2 = R0 / [2Q - (A0 / Q)] R3 = 2R0 S Q The Filter gain can be adjusted by varying R1, but with the A0 > 1 design, please be aware that influence from the open loop characteristic of the amplifier causes offset in the center frequency f0. FElectrical characteristic curves 60 Communication ICs BA4116FV 61 Communication ICs External dimensions (Units: mm) 62 BA4116FV