Communication ICs 2nd mixer and IF amplifier IC for digital cellular BH4138FV The BH4138FV is an IC developed for use with digital cellular phones. This IC contains a 2nd mixer and IF amplifier. Applications Digital cellular phones Features 1) Mixer circuit, IF amplifier, and RSSI circuit are builtin. 2) Mixer input frequency response 10MHz to 200MHz. 3) The recommended IF amplifier frequencies are 450kHz and 455kHz. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 664 4) 5) 6) 7) High gain IF amplifier (100dB). Battery saving function. Buffer amplifier for RSSI. Low voltage operation (2.3V to 5.5V). Communication ICs BH4138FV Block diagram 665 Communication ICs Pin descriptions 666 BH4138FV Communication ICs BH4138FV 667 Communication ICs 668 BH4138FV Communication ICs BH4138FV Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 3.0V, SG1 fIN(MIX) = 130MHz, SG2 fIN(LO) = 129.55MHz, 100dBµV, SG3 fIN(IF) = 450kHz) Alternating level to be indicated by termination. ∗Items marked with an asterisk are reference values 669 Communication ICs Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 3.0V, SG1 fIN(MIX) = 130MHz, SG2 fIN(LO) = 129.55MHz, 100dBµV, SG3 fIN(IF) = 450kHz) Alternating level to be indicated by termination. ∗Items marked with an asterisk are reference values 670 BH4138FV Communication ICs BH4138FV Measurement circuit 671 Communication ICs Application example 672 BH4138FV Communication ICs BH4138FV External dimensions (Units: mm) 673