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RDA Microelectronics, Inc.

RDA5815-Fully Integrated Satellite receiver for DVB-S , DVB-S2 & ABS-S，MMDS

DATA SHEET

RDA5815

Fully Integrated, Direct Down-Conversion Satellite

Receiver for DVB-S,DVB-S2&ABS-S,MMDS

______

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.

RDA Microelectronics, Inc.

RDA5815-Fully Integrated Satellite receiver for DVB-S , DVB-S2 & ABS-S,MMDS

Functional Block Diagram

RF input

Internal pre lna

Variable

Gain LNA

Loopout

VCO

AGC Amplifier

90

0

Variable Low Variable Gain

Pass Filter Output Amplifier

AGC Amplifier

PLL

Dividers, Phase Detector,

Loop Filter and Charge Pump

Variable Low

Pass Filter

Reference

Oscillator

Variable Gain

Output Amplifier

I2C

interface

Programming

and Control

IP

IN

QP

QN

Functional Description

The loop lna is used to generate the loopout signal.An on chip variable gain LNA is used to provide wide

tuner dynamic range. A direct conversion architecture is used to convert the RF signal to in-phase and

quadrature baseband signals. The signals required for direct conversion are all generated within the chip by a

fully integrated PLL and a quadrature LO generator. The frequency of the VCO is set by internal PLL circuits, which are

programmable via a 2-wire (I2C) serial bus. The LO signals are mixed with the RF signal input and then filtered by

low-pass filters to remove the upper image produced by the mixer. A variable gain amplifier is then used to adjust

the baseband signal levels before processing by the channel selection filters to optimize noise performance and

prevent distortion within the filters. The channel select filters are digitally programmable low pass filters with

1MHz step from 4MHz to 40MHz. The output amplifier buffered the signal from the filters to increase the driving

capability to the next baseband ADC.

Some innovative technique is used to correct and alleviate DC offsets inherent in direct conversion mixers,

the channel select filters and output buffers.

Loopout LNA

The loopout lna is used to generate the loopout signal.

Variable Gain LNA

This stage receives a signal from the LNB through external matching circuit, the input resistance is matched to

75Ω coaxial cable. The gain can be programmed with the 2-wire (I2C) interface to insure wide dynamic range of

the receiver.

AGC Amplifier

The AGC Amplifier receives the IQ signals from the quadrature mixer then amplifies them and sends to the base

band low pass filter. The gain is also programmed and controlled by the 2-wire (I2C) interface.

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.

2

RDA Microelectronics, Inc.

RDA5815-Fully Integrated Satellite receiver for DVB-S , DVB-S2 & ABS-S，MMDS

Typical application circuit

Application circuit

2.2nF 1000pF 1000pF

RFIN

100pF

C

LOOPOUT 100pF/NC

R

NC/0

V3.3

100pF 0.1uF

100pF

0.1uF

V3.3

VLNB

V3.3

1k

V3.3

0.1uF

32 31 30 29 28 27 26 25

33pF

100

100

33pF

1 PDN

2 RFIP

3 LOOP

4 Vcc

5 NC

6 ADD

7 NC

8 AGC

9

GND

PAD

RDA 5815

BBQP 24

BBQN 23

BBIN 22

BBIP 21

DVDD 20

NC 19

REFCLK 18

XTAL 17

10 11 12 13 14 15 16

0.1uF

27.0MHz

2.2k

V3.3

NC

0

close to rda5812

1K

27pF

27pF

close to BB

solution

1K

V3.3

V3.3

2.2k

0.1uF

0.1uF

0.1uF

0.1uF

Base Band

solution

Vcc3.3

BEAD

V3.3

Note:

The 5815 support the loopout, the setting is as follows:

loopout

The third pin of 5815<loop>

on R=NC, C=100pF

off R=0, C=NC

The value of register 04H’s 5bit

0

1

5bit of register 04H

rf_bypass_enable_b

0: power up

1: power down

Default: 1’b0

The bypass buf functions at power-up of the chip by

default. If this function is not required, set this bit to logic

‘1’, which will save about 6mA current.

______

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.

6

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