SI21662-B22-GMR - Dual DVB-S/S2 Satellite TV Demodulator | Skyworks
MPN: SI21662-B22-GMR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.55 | $65.50 |
| 100 | $5.85 | $585.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.75 | $4,750.00 |
| 2,500 | $4.3 | $10,750.00 |
SI21662-B22-GMR Overview
A satellite demodulator is a category of baseband signal-processing IC that converts the digitized IF output from a tuner into MPEG transport streams (or LVDS / parallel TS to an external host decoder). It belongs to the broader hypernym hierarchy: demodulator -> tuner/demodulator can -> receiver subsystem -> digital TV front-end -> consumer video SoC ecosystem. Modern DVB-S2 systems additionally apply LDPC forward-error-correction, so an Si2166x family device must pair with a low-noise PLL that meets the phase-noise mask demanded by 32APSK constellations.
Key features include dual independent DVB-S/DVB-S2/DSS demodulation channels, 32APSK and 16APSK support for high-efficiency DVB-S2 transponders, integrated LDPC and BCH FEC engines, DiSEqC 1.x and 2.x interface support, and a flexible TS output interface with serial, parallel and LVDS options. An on-chip programmable clock recovery synthesizer removes the need for an external VCXO in most designs, reducing BOM cost. The 68-QFN (8x8 mm) exposed-pad package supports a thermal resistance (theta_JA) suitable for the typical 0.6 W power dissipation of the device under full dual-channel load.
The SI21662-B22-GMR uses Skyworks' proprietary dual demodulator core architecture that shares the analog AGC loop and host interface between channels. Each demodulator includes its own channel filter, symbol-rate Nyquist filter, carrier-recovery loop, and LDPC decoder. The device is implemented in a standard CMOS process and supports both legacy DVB-S (QPSK) and the second-generation DVB-S2 standard with multi-level APSK constellations, giving receiver manufacturers a single silicon platform for legacy SD, HD, and UHD satellite transponder decoding.
Typical applications include dual-tuner satellite set-top boxes, hybrid satellite/terrestrial DVRs, professional satellite receiver cards, and television sets with built-in DVB-S2 tuners. The dual-channel architecture is particularly suited to watch-and-record scenarios where one tuner is dedicated to a live channel while the second records a different transponder simultaneously. The integrated DiSEqC interface also makes the part a natural fit for multi-LNB dish installations such as motorised DiSEqC 1.2 / 2.x setups.
When designing with the SI21662-B22-GMR, provide a clean 3.3 V regulated analog rail (LDO) and short, impedance-controlled IF traces from the tuner output, because the demodulator's symbol-timing recovery is sensitive to phase noise on both the IF and the reference clock. Use a 100 nF decoupling capacitor on every VDD pin and a single 10 uF bulk capacitor on the 3V3 supply pin.
This page synthesizes distributor pricing, drop-in Si2166x family alternatives, pinout guidance, and design notes that go beyond what the manufacturer datasheet alone provides for the SI21662-B22-GMR.
Drop-in alternatives for SI21662-B22-GMR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI21662-B40-GMR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI21662-B22-GM
✅ Drop-In📋 Reference alternative (not in catalog)
SI21662C-B22-GMR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI21662-B22-GMR Specifications
| Function | Dual DVB-S/S2/DSS Digital Satellite TV Demodulator |
| Number of Channels | 2 (independent) |
| Standards Supported | DVB-S, DVB-S2, DSS |
| Modulation Schemes | QPSK, 8PSK, 16APSK, 32APSK |
| Forward Error Correction | LDPC + BCH (DVB-S2), Viterbi + Reed-Solomon (DVB-S, DSS) |
| Host Interface | I2C (Serial) |
| Transport Stream Output | Serial / Parallel / LVDS selectable |
| Supply Voltage | 3.3 V |
| Package | 68-pin QFN (8x8 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -10 C to +70 C |
| DiSEqC Interface | DiSEqC 1.x / 2.x compatible |
| RoHS Status | Compliant (Pb-free GMR suffix) |
| Manufacturing Status | Obsolete / Last Time Buy |
SI21662-B22-GMR 68-pin qfn (8x8 mm) Pin Configuration Guide
Pin configuration for SI21662-B22-GMR (68-pin qfn (8x8 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SI21662-B22-GMR.
Refer to the datasheet for full pin configuration.
Typical Applications
SI21662-B22-GMR is suitable for 6 applications: Dual-Tuner Satellite Set-Top Box, Satellite + Terrestrial Hybrid DVR, Professional Satellite Receiver Card (PC/Embedded), Integrated Digital Television (iDTV) with Satellite, Multi-LNB Motorised Satellite Receiver, Cable / IPTV Headend DVB-S2 Demod Card.
Dual-Tuner Satellite Set-Top Box
The SI21662-B22-GMR's two independent DVB-S/DVB-S2/DSS demodulators share one 68-QFN package, making it ideal for watch-and-record set-top boxes that must tune two transponders simultaneously. According to Skyworks datasheet, each demodulator handles QPSK, 8PSK, 16APSK and 32APSK constellations with on-chip LDPC plus BCH FEC, so a single Si21662 plus tuner pair replaces what previously required two demodulator ICs. This reduces PCB area, BOM cost, and the host MPU's interrupt load compared to dual silicon implementations.
Recommended
Satellite + Terrestrial Hybrid DVR
Hybrid DVR designs that record a DVB-S2 transponder while simultaneously streaming a DVB-T/T2 broadcast benefit from the SI21662-B22-GMR's dual demodulators in a single package. The Si21662 channel-A handles the satellite IF while channel-B is reserved for the terrestrial tuner stream, allowing two-record + watch-live operation. DiSEqC 1.x / 2.x support also simplifies multi-LNB dishes. Power dissipation is roughly 0.6 W under full dual-channel load, so the 68-QFN exposed pad is adequate without an external heatsink.
Recommended
Professional Satellite Receiver Card (PC/Embedded)
Professional DVB-S2 receiver cards for broadcast monitoring and head-end transcoding need deterministic dual-channel decoding for two carriers on the same or different transponders. The SI21662-B22-GMR delivers two fully independent MPEG-TS outputs via its configurable serial, parallel or LVDS TS interface, allowing direct connection to PCIe bridge FPGA or SoC inputs. The 3.3 V single supply and 68-QFN footprint also simplify integration on a compact receiver card.
Recommended
Integrated Digital Television (iDTV) with Satellite
Modern iDTV designs with built-in satellite tuners use the SI21662-B22-GMR to decode DVB-S2 alongside the panel's main SoC. The chip's I2C interface integrates transparently into the TV's main MCU control loop, and its small 8x8 mm 68-QFN package fits behind the panel's tuner can. Built-in DiSEqC 1.x / 2.x compatibility supports motorised dish installations common in Europe. Designers also pair the Si21662 with a low-noise LDO such as PTL432LIBQDBZR for the analog 3.3 V rail to maximise CNR margin on weak transponders.
Recommended
Multi-LNB Motorised Satellite Receiver
DiSEqC 1.2 / 2.3 motorised dish systems require demodulators with hardware handshake support for bidirectional LNB commands. The SI21662-B22-GMR's integrated DiSEqC interface plus its dual demodulators are well matched to motorised satellite receivers that must retune channel B to a new transponder while channel A is still receiving a TV programme. The 3.3 V single-rail operation simplifies the LNB power supply tree in these often space-constrained remote-control units.
Recommended
Cable / IPTV Headend DVB-S2 Demod Card
Cable/IPTV headend systems that redistribute satellite programming over DOCSIS or IPTV backbones use the SI21662-B22-GMR to receive multiple DVB-S2 streams per slot, then forward MPEG-TS to a transcoder. The dual-channel single-package implementation doubles channel density per blade compared with two separate demodulator ICs, simplifying thermal management and backplane routing. The exposed-pad 68-QFN also dissipates the typically 0.6 W dual-channel load with only a moderate copper pour.
Recommended
Recommended Products Summary
Engineering reference data for SI21662-B22-GMR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI21662-B40-GMR | SI21662-B22-GM | SI2166-B22-GMR | SI21662C-B22-GMR |
|---|---|---|---|---|---|
| Brand | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Package | 68-QFN (8x8 mm) | 68-QFN (8x8 mm) - same | 68-QFN (8x8 mm) - same | 48-QFN (7x7 mm) | 68-QFN (8x8 mm) - same |
| Number of Demodulator Channels | 2 (dual) | 2 (dual) | 2 (dual) | 1 (single) | 2 (dual) |
| Standards Supported | DVB-S / DVB-S2 / DSS | DVB-S / DVB-S2 / DSS | DVB-S / DVB-S2 / DSS | DVB-S / DVB-S2 / DSS | DVB-S / DVB-S2 / DSS |
| 32APSK Support | Yes | Yes | Yes | Yes | Yes |
| Host Interface | I2C | I2C | I2C | GPIO, I2C | I2C |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| DiSEqC Support | 1.x / 2.x | 1.x / 2.x | 1.x / 2.x | 1.x / 2.x | 1.x / 2.x |
| Lifecycle Status | Obsolete | Last Time Buy | Obsolete | Obsolete | Active (verify) |
Key Differentiators
- Dual-channel DVB-S/S2/DSS in a single 68-QFN package (vs SI2166-B22-GMR)
- 68-QFN (8x8 mm) standard pinout shared across Si21662 family (vs SI21662C-B22-GMR (C-revision))
- 32APSK plus 16APSK DVB-S2 support (vs DVB-S-only legacy demodulators)
- On-chip DiSEqC 1.x / 2.x interface (vs External DiSEqC transceivers)
Design Notes
Estimated: The SI21662-B22-GMR draws roughly 0.6 W total under full dual-channel DVB-S2 32APSK load, so a 3.3 V regulator rated at least 600 mA is recommended (1 A headroom preferred for in-rush). Use a low-noise LDO such as PTL432LIBQDBZR for the demodulator analog rail to maximise CNR. Place a 100 nF decoupling capacitor within 3 mm of every VDD pin and a single 10 uF bulk capacitor on the 3V3 supply near the IC. Power-rail noise above 5 mVpp can degrade 32APSK acquisition margin, so avoid sharing the demodulator rail with digital switching circuits.
Keep IF input traces from the tuner to the SI21662 matched in length (within 1 mm) and impedance-controlled to 100 ohm differential per Skyworks reference layout. According to Skyworks datasheet, the IF inputs (IF1IN+/-, IF2IN+/-) must be AC-coupled with 10 nF capacitors placed close to the IC pads. Route I2C and TS outputs away from IF traces to avoid coupled phase noise. The exposed pad (EPAD) must be soldered to a continuous ground plane for thermal dissipation and electrical return.
Do not substitute the SI2166-B22-GMR (single-channel, 48-QFN) directly for the SI21662-B22-GMR (dual-channel, 68-QFN) - they are not pin-compatible because the package and pinout differ. Per Skyworks ordering code convention, the trailing 'R' on GMR denotes Tape-and-Reel packaging of 2500 units; dropping the 'R' (SI21662-B22-GM) gives Tray packaging for prototype builds. Always reference Si2166x family firmware migration notes from Skyworks support when updating to current silicon, since older firmware can have 32APSK acquisition issues on very low CNR transponders.
Estimated: The reference clock (CLK_IN or external XTAL) drives the SI21662's symbol-timing recovery, so its phase noise must stay below -110 dBc/Hz at 10 kHz offset per Skyworks reference design. A clipped sine TCXO or low-jitter crystal plus a series ferrite bead typically gives adequate margin. Long I2C or TS traces exceeding 50 mm should be source-terminated with 33 ohm to suppress reflections on the rising edge. Add a 4.7 kohm pull-up to 3.3 V on SDA and SCL, matching the I2C standard.
Compliance Information
GMR suffix denotes Pb-free matte-tin plating per RoHS. AEC-Q100 is not applicable - this is a consumer video processing IC, not an automotive part. REACH, halogen-free and conflict-minerals status: not stated in current distributor data, so marked unknown.
