U4311B

U4311B Low-Current Superhet Remote Control Receiver Description The U4311B is a monolithic integrated circuit in bipolar technology for low-current UHF remote control superheterodyne receivers in amplitude- or frequencymodulated mode. Typical applications are keyless car lock-, alarm- or tele-control remote indication systems. Especially for automotive applications, it supports a superhet design with about 1 mA total current consumption as required by the car manufacturers. Features D Usable for amplitude- and frequency-modulated transmission systems D Extremely low quiescent current (approximately 1 mA in standby mode due to wake-up concept) D Wide power supply voltage range 3 to 13 V D Sensitive IF amplifier for 10.7-MHz operating frequency D Logarithmic AM demodulator D FM demodulator D Monoflop exit to wake up a microcontroller D High-performance operational amplifier to realize a data recovering filter D Non-inverting clamping comparator with amplitudedepending hysteresis for data regeneration Block Diagram Wake-up out VS 15 VRef = 2.4V 13 Bandgap 11 Internal VRef = 2.4 V Monoflop RF Level Wake up Non – invert. clamping comparator 10 3 7 6 5 Data out 10.7 MHz 9 IF amplifier Quadrature detector Operational amplifier – 4 8 log AM out 10.7 MHz Figure 1. Block diagram 12 14 FM out Data filter 16 + 1 95 9968 2 Ordering Information Extended Type Number U4311B-M U4311B-MFL Package DIP16 SO16L Remarks Rev. A3, 28-Sep-00 1 (15) Free Datasheet http://www.datasheet-pdf.com...