This post explains for the transceiver.
The Part Number is RDA1846S.
The function of this semiconductor is Single Chip Transceiver.
The package is 5×5 mm 32 pin QFN.
Manufacturer: RDA Microelectronics
Preview images :
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Description
The RDA1846S has a powerful digital signal processor, which makes it have optimum voice quality, flexible function options, and robust performance under varying reception conditions.
The transceiver uses the CMOS process with a package size of 5x5mm. By virtue of its high integration, it requires the least external components and eliminates the complicated design of sensitive RF circuits on PCB.
Features
1. CMOS single-chip fully-integrated transceiver
2. Fully integrated frequency synthesizer and VCO
3. Digital auto frequency control (AFC)
4. Digital auto gain control (AGC)
5. Selectable pre/de-emphasis
6. Received signal strength indicator (RSSI)
7. DTMF and programmable in-band dual tone
8. Programmable in-band single tone transmitter
9. Auto RX/TX/SLEEP state switching
Applications:
1. Cellular handsets
2. Family radio services
3. Walkie Talkies
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