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

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The Si21812 integrates two separate high-performance digital demodulators for the Japanese and South American terrestrial ISDB-T standard and for the DVB-T, DVB-C, DVB-S2/S and DVB-S2X standards into a single compact package. Leveraging Silicon Labs' proven digital demodulation architecture, the Si21812 achieves excellent reception performance for each media while significantly minimizing front-end design complexity, cost, and power dissipation. Connecting the Si21812 to both a dual terrestrial/cable TV tuner, and a dual satellite tuner, results in a high-performance and cost optimized TV front-end solution.

Leveraging significant field experience in DVB terrestrial demodulation (DVB-T2/T), the Si21812 dual 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.

The DVB-T and DVB-C, including ITU-T J.83 annex B, demodulators are enhanced versions of proven and broadly used Si2164/67/68/69 Silicon Labs 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. It also integrates two DiSEqC™ 2.0 LNB interfaces for satellite dish control and, for each satellite demodulator, an equalizer to compensate for echoes in long cable feeds from the LNB to the satellite tuner RF input.

The Si21812 offers an on-chip blind scanning algorithm for DVB-S/S2/S2X and DVB-C standards, as well as blind lock function. The Si21812 embeds two independent programmable transport stream interfaces which provide a flexible range of output modes, including a cross-bar functionality, and are 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 dual demodulator family: Si216x2 and Si218x2
API compatible with all single and all dual demodulators
ISDB-T (ABNT NBR 16.601 and 15.604)
6, 7, and 8 MHz bandwidth
Partial reception supported
AC1 and AC2 decoding
DVB-T (ETSI EN 300 744)
NorDig Unified 2.5, D-Book 8 compliant
DVB-C (ETSI EN 300 429) / ITU-T J.83 Annex A/B/C
1 to 7.2 MSymbol/s, C-Book compliant
DVB-S2 (ETSI EN 302 307-1 V1.4.1)
QPSK/8PSK demodulator
DVB-S2X (ETSI EN302 307-2 V1.1.1)
QPSK/8PSK, 8/16/32APSK demodulator
Roll-off factors from 0.05 to 0.35
Channel bonding for TS transmission supported
DVB-S (ETSI EN 300 421) and DSS supported
Dual DiSEqC 2.x interface, Unicable support
1 to 45 MSps for all satellite standards (<40 MSps in 32APSK)
I2C serial bus interfaces (master and host)
Upgradeable with firmware patch download via fast SPI or I2C (broadcast mode supported)
Dual independent differential IF input for T/C tuners and differential ZIF I/Q inputs for satellite tuners
GPIOs and multi-purpose ports (two per demodulator)
Separate flexible TS interfaces with serial or parallel outputs and cross-bar feature
Fast lock times for all standards
Only two power supplies: 1.2 and 3.3 V
8x8 mm, QFN-68 pin package, Pb-free/RoHS compliant

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