U4065B

Features On-chip Control Functions are Available for System Gain Adjust (dB Linear versus DC Current) Low Noise LO Design ESD Protected Benefits All Front-end Functions of a High-performance FM Receiver Except the RF Preamplifier are Integrated FM Receiver IC U4065B Improved Dynamic Range by High Current Double-balanced Mixer Design and a New AGC Conception with 3 Loops On-chip Improved Blocking and Intermod Behavior Due to a Unique “Interference” Sensor Controlling the AGC Easy Cascading of 3 IF Filters (Ceramic) Enabled by Two On-chip IF Preamplifiers Description The IC U4065B is a bipolar integrated FM front-end circuit. It contains a mixer, an oscillator, two IF preamplifiers and an unique interference sensor. The device is designed for high-performance car radio and home receiver applications. Rev. 4807A–AUDR–05/04 Figure 1. Block Diagram ANT VS IF tank IF BPF IF gain adjust IF BPF IF output IF BPF RF tank 16 14 PIN ATT Mixer IF 1 IF 2 2 19 18 20 21 4 7 5 3 VS RF RF tank NC 12 Interference mixer AGC wide band and IF 13 AGC adjust (wide band) LO tank 23 24 Local oscillator IF and detector VREF = 4 V Voltage regulator 17 22 1 11 Interference IF BPF 9 8 10 6 + VS LO output VTUNE VS AGC level 2 U4065B 4807A–AUDR–05/04 U4065B Pin Configuration Figure 2. Pinning SO24 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 LOB LOE GND5 IF1IN GND4 MIXOUT2 MIXOUT1 VREF MIXIN2 MIXIN1 LOBUFF GND1 IF2OUT GAINIF1 IF2IN VS IF1OUT GND2 IMIFI...