General Description
The RDA5820 is a single-chip broadcast FM transceiver with fully integrated synthesizer, IF selectivity and MPX decoder. The chip uses the CMOS process, support multi-interface and require the least external component. The package size is 4X4mm and is completely adjustment-free. All these make it very suitable for portable devices.
The RDA5820 has a powerful low-IF digital audio processor, this make it have optimum sound quality with varying reception conditions.
The RDA5820 use RDA patented dual synthesizers, all digital transmit structure, this make it have perfectly transmition performance and agility.
The RDA5820 support 65M~115M frequency band receive and transmit, integrate 4K memory, these make it can be used in simple wireless control appliance such as toy.

FEATUREs
● CMOS single-chip fully-integrated FM transceiver
● Low power consumption
   ► Total current consumption lower than 20mA at 3.0V power supply
● Support worldwide and campus frequency band
   ► 65 -115 MHz
● Digital low-IF tuner
   ► Image-reject down-converter
   ► High performance A/D converter
   ► IF selectivity performedinternally
● Fully integrated digital frequency synthesizer
   ► Fully integrated on-chip RF and IF VCO
   ► Fully integrated on-chip loopfilter
● All digital transmitter
● Autonomous search tuning
● Support integrated Rx/Tx PCB antenna
● Support SNRFM searching
● Include 4K memory
● Support 32.768KHz crystal oscillator
● Digital auto gain control (AGC)
● Digital adaptive noise cancellation
   ► Mono/stereo switch
   ► Soft mute
   ► High cut
● Programmable de-emphasis (50/75 ms)
● Receive signal strength indicator (RSSI)
● Bass boost
● Volume control
● Support I2S digital transmitter
● Support audio power amplifier ( 32Ω resistance loading)
● I2S digital input / output interface
● Line-level analog output voltage
● 32.768 KHz, 12M,24M,13M,26M,19.2M,38.4MHz reference clock
● 2-wire and 3-wire serial control bus interface
● Directly support 32Ω resistance loading
● Integrated LDO regulator
   ► 2.7 to 5.5 V operation voltage
● 4X4mm 24 pinQFN package

APPLICATIONs
● Cellular handsets
● MP3, MP4 players
● Portable radios
● PDAs, Notebook PCs
● Wireless Toys