Digital TV Demodulator

Copyright © 2009 by Silicon Laboratories

8.24.09

Si2165

HOST_SCL

HOST_SDA

Shared

FRONT

END

OSC

& PLL

DVB-T/C

DEMOD

ADC_IN

ADC_IP

Dual

AGC

ADC_QN

ADC_QP

12-bit

ADC

12-bit

ADC

8-bit

ADC

DSP

EQUALI

ZER

FEC

PID

FILTER

TS

I/F

µP

I/F

SWITCH

TUN_SDA

TUN_SCL

GPIO

CTRL

I/F

RF_AGC

IF_AGC

RSSI

GPIO0..5

TS_SYNC

TS_VAL

TS_ERR

TS_CLK

TS_DATA

RESETB

1.2, 3.3 V

8

4 MHz

Xtal: 16,20,

24,27 MHz

or

Si2165

Multi-Standard DVB-T and DVB-C Demodulator

Description

The Si2165 is a compact standalone DVB-T/C digital TV

demodulator ideally matching Silicon Labs’ Si2170/1/2 new

hybrid high-performance silicon tuner product family. The analog

front-end consists of two ADCs with wide dynamic range (12-bit)

to allow operation with standard IF (~36 MHz), Low-IF, or Zero-IF

inputs. This enables the use of the Si2165 with any TV tuner,

either metal can or silicon tuner based.

The multi-standard demodulator supports all modes of DVB-T

(EN 300 744), including hierarchical modes. The Si2165 also

supports ITU J.83 annex A/C and DVB-C (EN 300 429),

including a user-configurable 31-tap equalizer. In addition to

DVB-T's legacy modes, the Si2165 also complies with DVB-H

(EN 300 744 Annex F) specificities: 4K FFT, extended TPS,

“native” and “in-depth” deinterleavers. The Si2165 is able to

receive DVB-H programs in fixed receiver applications (without

decoding the additional MPE FEC layer).

An

embedded

32-bit

DSP

controls

device

operation.

Sophisticated on-chip algorithms ensure optimum reception

even under difficult channel conditions, such as echoes outside

the guard interval, pre-echoes, or strong impulse noise. For

ease-of-use, DSP firmware is preloaded into ROM (device is

immediately active at powerup). Nevertheless, there is a

interface (e.g., to adjust the demodulator to unexpected

conditions or reception impairments).

Thanks to proprietary features, the Si2165 supports ultra-fast

channel scanning for VHF/UHF terrestrial and cable DTV

channels. For supported tuners, the Quickscan algorithm for

blindscan is running onto the embedded DSP (in order to limit the

host CPU load) and is provided as a downloadable patch file.

Serial or parallel master MPEG TS output modes are supported.

Furthermore, a TS slave parallel mode is available via a GPIF port

and provides a glueless interface to Silicon Labs' MCU devices

with embedded USB interface. The user can optionally program a

32-PID hardware filter to reduce the output TS bit rate.

A maximum of six general-purpose inputs/outputs are available;

three GPIOs also feature

/ and interrupt output capabilities.

Best-in-class demodulation performance is achieved while still

maintaining very low-power operation.

The Si2165 guarantees a low-cost system implementation due to

its minimal BOM and very small package footprint.

Features

demodulator & FEC decoder

sampling mode)

code avoids need for code download at startup

plus RSSI measurement

(with tri-state function)

embedded FIFO, providing a seamless interface to any USB

controller.

Applications