DVB-S2/S2X/T/C/S/ISDB-T demodulator

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The Si2181 integrates digital demodulators for the Japanese and South American terrestrial ISDB-T standard and for all first and second generation DVB standards (DVB-T/C/S/S2 and S2X) in a single advanced CMOS die. Leveraging Silicon Labs' proven digital demodulation architecture, the Si2181 achieves excellent reception performance for each media while significantly minimizing front-end design complexity, cost, and power dissipation. Connecting the Si2181 to a hybrid TV tuner or digital only tuner, such as Silicon Labs' Si217x/5x/4x devices, results in a high-performance and cost optimized TV or STB front-end solution.

Leveraging significant field experience in DVB terrestrial demodulation (DVB-T), Silicon Labs’ internally-developed ISDB-T demodulator can accept standard or low-IF inputs (differential) and complies with the Brazilian SBTVD-T terrestrial specifications (ABNT NBR 16.601 and 15.604). Main features include fast channel scan, very short lock times, state of the art CCI performance, partial reception, and auxiliary channels decoding.

DVB-T, DVB-C, and DVB-S2/S demodulators are next-generation enhanced versions of proven and broadly-used Silicon Labs’ Si2169/68/67/66/64/62/60 devices.

The satellite reception allows demodulating widespread DVB-S, DIRECTV™ (DSS), DVB-S2, DIRECTV™ (AMC) legacy standards, and new Part II of DVB-S2 (S2X) satellite broadcast standard. A zero-IF interface (differential) allows for a seamless connection to market proven satellite silicon tuners. Si2181 embeds DiSEqCTM 2.0 LNB interface for satellite dish control and an equalizer to compensate for echoes in long cable feeds from the antenna to the satellite tuner input.

The cable reception allows demodulating widely deployed DVB-C legacy standard (ITU-T J.83 Annex A/C) and the Americas' cable standard (ITU-T J.83 Annex B).

The Si2181 offers an on-chip blind scan algorithm for DVB-S/S2/S2X and DVB-C standards, as well as a blind lock function. The Si2181 programmable transport stream output interface provides a flexible range of output modes and is fully compatible with all MPEG decoders or conditional access modules to support any customer application.

Symmetry Electronics is an authorized Silicon Labs distributor.


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Pin-to-pin compatible with all Si216x/8x single demods family
API compatible with all single and dual demods families
ISDB-T (ABNT NBR 16.601 and 15.604)
6, 7, and 8 MHz bandwidth
Partial reception supported
AC1 and AC2 decoding
DVB-S2 (ETSI EN 302 307-1 V1.4.1)
QPSK/8PSK demodulator
DVB-S2X (ETSI EN302 307-2 V1.1.1)
QPSK/8PSK, 8/16/32APSKdemodulator
Roll-off factors from 0.05 to 0.35
DVB-T (ETSI EN 300 744)
OFDM demodulator and enhanced FEC decoder
NorDig Unified 2.5 and D-Book 8 compliant
DVB-C (ETSI EN 300 429) and ITU-T J.83 Annex A/B/C
QAM demodulator and FEC decoder
1 to 7.2 MSymbol/s
DVB-S and DSS supported
QPSK demodulator and enhanced FEC decoder
1 to 45 MSymbol/s for all satellite standards (<40 MSps in 32APSK)
LDPC and BCH FEC decoding for S2 standard
I2C serial bus interfaces (master and host)
Firmware control (embedded ROM/NVM)
Upgradeable with patch download via I2C or fast SPI
Flexible TS output interface (serial, parallel, and slave)
DiSEqC 2.0 interface and Unicable support for satellite
Fast lock times for all media
Low power consumption
Two power supplies: 1.2 and 3.3 V
7x7 mm, QFN-48 pin package, Pb-free/RoHS compliant

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DVB-S2/S2X/T/C/S/ISDB-T demodulator