U4311B-FS

U4311B-FS Low-Current Superhet Remote Control Receiver Description The U4311B-FS is a monolithic integrated circuit in bipolar technology for low-current UHF remote control super-heterodyne 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 output 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 19 VRef = 2.4V 17 Bandgap 15 Internal VRef = 2.4 V Monoflop RF Level Wake up Non – invert. clamping comparator 13 3 9 7 6 Data out 10.7 MHz 12 IF amplifier Quadrature detector Operational amplifier – 5 11 16 18 FM out Data filter 20 + 1 12648 2 log AM out 10.7 MHz Figure 1. Block diagram Ordering Information Extended Type Number U4311B-MFSG3 Package SSO20 Remarks Ambient temperature up to +105°C Rev. A3, 28-Sep-00 1 (13) Free Datashe...