General Description:
CYSR805 is a single chip Super Regenerative Receiver(SRR) RF IC .
CYSR805 is composed of an low noise pre-amplifier, the super regenerative oscillator, off Signal Generator, the envelope detector demodulator , etc. The chip operates at 315MHz/433MHz ISM (Industrial, Scientific and Medical) band, using OOK (On Off Keying) modulation.
The chip demodulate the received RF signal and outputs the CMOS level data signal, so that the "data in, data out." is achieved .Chip operating voltage is  4.5 ~ 5.5V,current consumption is 4mA at 5V operating voltage , typical sensitivity is  better than -95dBm. The maximum data rate is 10Kbit / s, Operating temperature range from -20 ° C to +70° C.

Features
integrated OOK  RF receiver chip
No need 50Ω input match
Data Rate<10Kbit / s
4.5 ~ 5.5V power supply

Low power consumption, high sensitivity
high reliability, easy production
Power-on time<20ms
data in, data out

Application
Alarm and security systems
Home automation control
Automatic Test System
Vehicle Safety Systems


Circuit principle
CYSR805 is composed of the low noise pre-amplifier, the super-regenerative oscillator, off Signal Generator, the envelope detector demodulator, as shown in Figure 2. Super-regenerative oscillator operates at quenching state, controlled by the quench signal generating circuit ,in each oscillation cycle, the oscillator changes the  start-up time according to the strength of the input signal, if the input signal is strong, the start-up time is short, and vice versa. After envelope detection circuit, the change of the start-up time  is converted into an envelope signal of different widths, the wide envelope signal is demodulated into a logic "1", the narrow envelope signal is demodulated into logic "0 ", to obtain the final output data signal.
Remote control device
Industrial Control
Short-range wireless communications

CYSR805 typical parameters at 315MHz:

 

 
CYSR805 typical parameters at 433.92MHz: