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The information contained herein is the exclusive property of RDA and shall not be distributed, reproduced, or disclosed in whole or in

part without prior written permission of RDA.

RDA5820NS

SINGLE-CHIP BROADCAST FM TRANSCEIVER Rev.1.1–Mar.2011

1 General Description

The RDA5820NS is the newest generation

single-chip broadcast FM receive/transmit tuner

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 3X3mm

and is completely adjustment-free. All these make

it very suitable for portable devices.

The RDA5820NS has a powerful low-IF digital

audio processor, this make it have optimum sound

quality with varying reception conditions.

The RDA5820NS use RDA patented dual

synthesizers, all digital transmit structure, this

make it have perfectly transmition performance

and agility.

The RDA5820NS support 50M~115M frequency band FM and RDS/RBDS receive and transmit, support

power supply range is 1.8-5.5V, all these make it can be used in simple wireless control appliance such

as mobile phone or toys.

The RDA5820NS package is pin-to-pin compatible with FM receive tuner RDA5802NS.

1.1 Features

 CMOS single-chip fully-integrated FM transceiver

 Low power consumption

 Total current consumption is about 22mA at

3.0 V power supply (receive mode)

 Total current consumption is about 26 mA at

3.0 V power supply (maximum power transmit

mode)

 Support worldwide and campus frequency band

 50 -115 MHz



Support flexible channel spacing mode



100KHz, 200KHz, 50KHz and 25KHz

 Digital low-IF tuner

 Image-reject down-converter

 High performance A/D converter

 IF selectivity performed internally

 Fully integrated digital frequency synthesizer

 Fully integrated on-chip RF and IF VCO

 Fully integrated on-chip loop filter

 All digital transmitter

 Autonomous search tuning

 Support RDS/RBDS receive and transmit

 Support SNR FM searching

 Support 32.768KHz crystal oscillator

 Digital auto gain control (AGC)

 Digital adaptive noise cancellation

 Mono/stereo switch

Figure 1-1. RDA5820NS Top View

RDA Microelectronics, Inc. RDA5820NS FM Transceiver V1.1

The information contained herein is the exclusive property of RDA and shall not be distributed, reproduced, or disclosed in whole or in

part without prior written permission of RDA.

Page 2 of 28

2 Table of Contents

1 General Description....................................................................................................................................1

1.1 Features.........................................................................................................................................1

1.2 Applications ..................................................................................................................................2

2 Table of Contents.........................................................................................................................................2

3 Functional Description................................................................................................................................3

3.1 FM Transceiver Structure..................................................................................................................3

3.2 FM Receive...................................................................................................................................3

3.3 FM Transmit..................................................................................................................................4

3.4 Audio Amplify ..............................................................................................................................4

3.5 I2S Transmit..................................................................................................................................4

3.6 PA..................................................................................................................................................4

3.7 Synthesizer1..................................................................................................................................4

3.8 Synthesizer2 ....................................................................................................................................4

3.9 Power Supply ................................................................................................................................4

3.10 RESET and Control Interface select .............................................................................................4

3.11 Control Interface ...........................................................................................................................4

3.12 I

S Audio Data Interface ...............................................................................................................5

3.13 GPIO Outputs................................................................................................................................5

4 Electrical Characteristics ...........................................................................................................................6

5 Receiver Characteristics.............................................................................................................................7

6 Transmitter Characteristics .......................................................................................................................9

6.1 I

C Interface Timing....................................................................................................................11

7 Register Definition ....................................................................................................................................12

8 Pins Description.........................................................................................................................................18

9 Application Diagram.................................................................................................................................21

9.1 RDA5820NS Common Application Diagram:............................................................................21

9.1.1 Bill of Materials: .........................................................................................................................21

10 Package Physical Dimension....................................................................................................................22

11 PCB Land Pattern.....................................................................................................................................23

12 Change List................................................................................................................................................26

13 Notes： .......................................................................................................................................................26

14 Contact Information .................................................................................................................................27

RDA Microelectronics, Inc. RDA5820NS FM Transceiver V1.1

The information contained herein is the exclusive property of RDA and shall not be distributed, reproduced, or disclosed in whole or in

part without prior written permission of RDA.

Page 3 of 28

3 Functional Description

LIN

RIN

Figure 3-1. RDA5820NS FM Transceiver Block Diagram

3.1 FM Transceiver Structure

The RDA5820NS is a single-chip FM transceiver

(Rx/Tx). Based on RDA patented dual

synthesizers RF structure, it has perfectly FM

receive and transmit performances, also least

external components.

Except FM receive and transmit, the RDA5820NS

also have RDS/RBDS, I2S input/output, audio

amplify functions. All these make it very suitable

for portable devices.

3.2 FM Receive

The receiver uses a digital low-IF architecture that

avoids the difficulties associated with direct

conversion while delivering lower solution cost

and reduces complexity, and integrates a low

noise amplifier (LNA) supporting the FM

broadcast band (50 to 115MHz), a quadrature

image-reject mixer, a programmable gain control

(PGA), a high resolution analog-to-digital

converters (ADCs), an audio DSP and a high-

fidelity digital-to-analog converters (DACs).

The LNA has differential input ports, which have

same characters and anyone of them can used as

FM signal input port. The two LNA ports can be

arbitrary selected by set according registers bits

(LNA_PORT_SEL[1:0]). It default input common

mode voltage is GND.

The quadrature mixer down converts the LNA

output differential RF signal to low-IF, it also has

image-reject function.

The PGA amplifies the mixer output IF signal and

then digitized with ADCs.

The DSP core finishes the channel selection, FM

demodulation, stereo MPX decoder and output

audio signal. The MPX decoder can autonomous

switch from stereo to mono to limit the output

noise.

The DACs convert digital audio signal to analog

and change the volume at same time. The DACs

has low-pass feature and -3dB frequency is about

30 KHz.

The PA (Power Amplifier) is power down. Its

output impedance is high resistance.

RDA Microelectronics, Inc. RDA5820NS FM Transceiver V1.1

The information contained herein is the exclusive property of RDA and shall not be distributed, reproduced, or disclosed in whole or in

part without prior written permission of RDA.

Page 4 of 28

3.3 FM Transmit

The transmit uses a digital modulate structure.

Audio signals (LIN and RIN) are amplified by

PGAs firstly, then converted to digital codes by

ADCs. The DSP core finishes audio coding and

FM modulate, pre-emphasis. The syntersizer2

transmits the digital FM data to VCO2. The PA

(Power Amplifier) amplify the FM signal.

The PGA gain and PA gain are adjustable by

set according registers bits (PGA_GAIN[2:0]

and PA_GAIN[5:0]

Table 3-1 PGA_GAIN and Input Signal Strength

PGA_GAIN[2:0] V-LIN(V

) PGA_GAIN[2:0] V-LIN(V

)

000 1.20V 100 0.075V

001 0.60V 101 0.037V

010 0.30V 110 0.018V

011 0.15V 111 0.009V

Table 3-2 PA_GAIN and Fm Transmit Power

PA_GAIN[5:0] P

OUT

PA_GAIN[5:0] P

OUT

111111 3dBm 011001 -3dBm

100111 0dBm 000000 -32dBm

3.4 Audio Amplify

Audio signals (LIN and RIN) can also directly

send to audio amplifier in DACs and driving the

headphone through LOUT and ROUT ports.

3.5 I2S Transmit

The RDA5820NS supports directly digital FM

transmit. The digital signals can input through

chip’s ports GPIO1/2/3, then transmits directly

through synthersizer2 and PA, also transimts to

DAC and send out through LOUT and ROUT

ports. I2S mode support slave mode.

3.6 PA

The PA (Power Amplifier) work frequency band is

50~115MHz, and output power is linearly

adjustable. The PA use linear structure for better

frequency distortion performance.

3.7 Synthesizer1

The frequency synthesizer 1 (including

synthesizer1 and VCO1 ) generates the local

oscillator signal which divide to quadrature, then

be used to downconvert the RF input to a

constant low intermediate frequency (IF). The

synthesizer reference clock is 32.768 KHz.

The synthesizer1 frequency is defined by bits

CHAN[9:0] with the range from 50MHz to

115MHz.

The synthesizer1 also generates reference to

synthesizer2 under FM TX (transmit) mode.

3.8 Synthesizer2

The frequency synthesizer 2 (including

synthesizer2 and VCO2 ) generates clock

signals for ADC under FM RX (receive) mode.

The frequency synthesizer2 is also the FM

transmit core. The digital signals (audio and

RDS/RBDS) are directly added on it.

3.9 Power Supply

The RDA5820NS integrated one LDO which

supplies power to the chip. The external supply

voltage range is 1.8-5.5 V.

3.10 RESET and Control Interface select

The RDA5820NS is RESET itself When VIO is

Power up. And also support soft reset by trigger

02H BIT1 from 0 to 1.

3.11 Control Interface

The RDA5820NS only supports I

C control

interface.

The I

C interface is compliant to I

C Bus

Specification 2.1. It includes two pins: SCLK and

剩余27页未读，继续阅读

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