TH71112 Datasheet | Melexis

Features ! Double superhet architecture for high degree of image rejection ! FSK for digital data and FM reception for analog signal transmission ! FM/FSK demodulation with phase-coincidence demodulator ! Low current consumption in active mode and very low standby current ! Switchable LNA gain for improved dynamic range ! RSSI allows signal strength indication and ASK detection ! Surface mount package LQFP32 Ordering Information Part No. Temperature Range -40 °C to 85°C Package LQFP32 Application Examples ! General digital and analog 868 MHz or 915 MHz ISM band usage ! Low-power telemetry ! Alarm and security systems ! Keyless car and central locking ! Pagers Technical Data Overview ! Input frequency range: 800 MHz to 930 MHz ! Power supply range: 2.5 V to 5.5 V ! Temperature range: -40 °C to +85 °C ! Operating current: 7.5 m A at low gain and 9.2 m A at high gain mode ! Standby current: < 100 n A ! Sensitivity: -109 d Bm 1) with 40 k Hz second IF filter BW (incl. SAW front-end filter loss) ! Sensitivity: -102 d Bm 2) with 150 k Hz second IF filter BW (incl. SAW front-end filter loss) ! Range of first IF: 10 MHz to 80 MHz ! Range of second IF: 455 k Hz to 21.4 MHz ! Maximum input level: - 10 d Bm at ASK and 0 d Bm at FSK ! Image rejection: > 65 d B (e.g. with SAW front-end filter and at 10.7 MHz 2nd IF) ! Spurious emission: < -70 d Bm ! Input frequency acceptance: ±50 k Hz (with AFC option) ! RSSI range: 70 d B ! Frequency deviation range: ±5 k Hz to ±120 k Hz ! Maximum data rate: 80 kbit/s NRZ ! Maximum analog modulation frequency: 15 k Hz 1) at ± 8 k Hz FSK deviation, BER = 3⋅10-3 and phase-coincidence demodulation 2) at ± 50 k Hz FSK deviation, BER = 3⋅10-3 and phase-coincidence demodulation TH71112 Data Sheet 3901071112 Page 1 of 20 Nov. 2001 Rev. 005 868/915MHz FSK/FM/ASK Receiver General Description The TH71112 receiver IC consists of the following building blocks: " PLL synthesizer (PLL SYNTH) for generation of the first and second local oscillator...