4CH Superregenerative decode Receiver Module PT2272L4/PT2272M4/SC2272T4 

Technical indicators:

• Radio frequency: 315MHz
• Operating Voltage : 5VDC
• Operating current : <5mA
• Receiving Type : Superregeneration
• Output type: TTL
• Receiving Sensitivity: -103dBm
• Decoder chip: PT2272-M4 (L4), there are four parallel data output 
• one effective instruction decoder output (non-locking), eight three-state address code
• default is M4
• Size : 49×20×7mm
• D0,D1,D2,D3=SIGNAL
• Vcc= +5V
• GND
• output mode: There are two, one for non-Lock (M) mode (ie, jog or pulse mode), 
• the other is interlocked (L) method (that is, the signal latch mode)

Application:

• 1, range: all kinds of industrial remote control, remote metering, anti-theft alarm signal receiver, remote control to various of household appliances.
• 2, its receiving frequency has been fixed at 315MHz,please don't adjust module inductor when using it,so as not to affect reception. 
• 3, the antenna is with a soft wire or other hard metal (such as the rod antenna), 250mm long, neither too long nor too short, otherwise it will affect the receiving distance. if using soft wire, please straighten and suspended use, and try not to close to metal objects. 
• 4, avoid electromagnetic interference and metal shielding. 
• 5, supply voltage should be stability and low ripple ratio, multi-level filter (such as increasing the bead ﹑ capacitors, inductors). 
• 6, if working together with singlechip,MCU clock frequency should be under 4MHZ, and crystal should be away from the RF receiver module as far as possible, otherwise the crystal's higher harmonics will effect communication distance. 

Reference Application Circuits: