Part Number : BH4126FV
Function : Wide band IF detector for RF remote control units
Package : SOP 16 Pin Type
Maker : ROHM Semiconductor
Pinouts : 
Description :
The BH4126FV is an IC equipped with internal mixer, IF amplifier, and FM detector circuits, developed for use with RF remote control units.
Applications : Keyless entry
Features
1) Equipped with internal mixer, IF, RSSI, and FM detection circuits.
2) Can be operated at mixer input frequencies ranging from 20MHz to 300MHz.
3) Equipped with a battery power saving function.
4) Fast RSSI response.
5) High FM detection sensitivity. (21.2mV / kHz)
Datasheet PDF Download : 
Others datasheet of same file : BH4126-FV