GS3440
The GS3440 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm coaxial cable.
The device is designed to support SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259, and is optimized for performance at 270Mbps, 1.485Gbps and 2.97Gbps.
The GS3440 features DC restoration to compensate for the DC content of SMPTE pathological test patterns.
The Carrier Detect output pin (CD) indicates whether a valid input signal has been detected. It can be connected directly to the SLEEP pin to enable automatic power-down upon loss of carrier. In the manual sleep mode, a voltage programmable threshold, which can be changed via the SQ_ADJ pin, forces CD high when the input signal amplitude falls below the threshold. This allows the GS3440 to distinguish between low-amplitude SDI signals and noise at the input of the device.
The equalizing and DC restore stages are disengaged when the BYPASS pin is HIGH. No equalization occurs in Bypass mode.
The GS3440 includes a gain selection pin (GAIN_SEL) which, when tied HIGH, compensates for 6dB flat attenuation.
The differential outputs can be DC-coupled to all Gennum® cable drivers and reclockers and to industry-standard 1.2V, 2.5V and 3.3V CML logic using the VCC_O pin. In general, DC-coupling to any termination voltage between 1.2V and 3.3V is supported.
The GS3440 also includes programmable de-emphasis with three operating levels in order to support long PCB traces. The device is available in a 16-pin, 4mm x 4mm QFN package.
The GS3440 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are RoHS compliant.
Features
- SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 compliant
- Automatic cable equalization
- Multi-standard operation up to 2.97Gbps
- Performance optimized for 270Mbps, 1.485Gb/s and 2.97Gbps. Typical equalized length of Belden 1694A cable:
- 200m at 2.97Gbps
- 250m at 1.485Gbps
- 500m at 270Mbps
- Supports DVB-ASI at 270Mbps
- Manual bypass (useful for low data rates with slow rise/fall times)
- Programmable carrier detect with squelch threshold adjustment
- Automatic power-down on loss of signal
- Standby power <30mW (typical)
- Differential outputs support DC-coupling to 1.2V, 2.5V and 3.3V CML logic
- 0/6dB gain boost selection pin
- Selectable de-emphasis: 2dB, 4dB and 6dB
- Standard EIA/JEDEC logic control and status signal levels
- Wide operating temperature range of -40ºC to +85ºC
- Small footprint QFN package (4mm x 4mm)
- Footprint compatible with the GS2974, GS2984 and GS2994
- Pb-free and RoHS compliant
- SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 coaxial cable serial digital interfaces
アプリケーション
Pb(Lead)-Free/RoHS-Green Info
(-40°C to +85°C / 4000 cycles)
(50°C, 4000 Hrs)
プロトタイプ作成と制作に役立ち、ダウンロード可能な豊富なリソースとデータシートを活用しましょう。
Login or register for mySemtech to gain access to restricted product documentation and to add documents to your Watch List for update alerts
Distributor/Catalog Supplier Inventory
View product availability from participating distributors below. Browse all distributers here.
| Part # | Country | Qty | Buy | Distributor |
|---|
関連情報
To see more videos Videos
スタジアムの巨大スクリーンで野球の試合のアクションのリプレイを視聴する場合でも、大画面テレビで映画を視聴する場合でも、ノートパソコンでビデオをストリーミングする場合でも、高品質のオーディオビジュアル (AV) 体験が常に期待されています。デジタルAV伝送には、超高精細シリアルデジタルインターフェイス (UHD-SDI) と高解像度マルチメディアインターフェイス (HDMI) の2つの規格があります。UHD-SDIは、同軸または光ファイバーケーブルを介した非圧縮・非暗号化のデジタルAV信号の伝送を標準化します。HDMI は、HDMI準拠のソースからAVディスプレイに高解像度、高速デジタルマルチトラックオーディオおよび非圧縮ビデオ信号を送信するためのデジタルインターフェイスです。どちらも超高精細AV信号をソースからディスプレイに転送できますが、コンピューター、ゲーム機、Blu-ray/DVDプレーヤー、テレビ、プロジェクターなどの消費者向け機器の接続にはHDMIが好まれます。UHD-SDIは、ケーブル両端の物理的なロック機構で長距離伝送と堅牢な接続をサポートするため、プロの屋内/屋外ビデオ制作やテレビ放送などのハイエンドアプリケーションに適しています。UHD-SDI同軸ケーブルは最大300フィートの信号を転送できますが、HDMIケーブルは50フィート以内でも過度の信号劣化が問題となります。これら2つのインターフェイスは、HDMI-SDIまたはSDI-HDMIコンバーターを使って併用できます。例えば、図1のように、HDMIディスプレイはSDIストリームの信頼性監視に使用でき、この場合、特別に調整されたSDI固有のディスプレイを使用する必要がなくなります。
Circuit Protection for HDMI-SDI/SDI-HDMI…
今すぐ読む
I designed my first product using the Serial Digital Interface (SDI) back in 1996, and little did I know that this fledgling coax-based video interface standard would dominate my career for the next 20+ years. Back then, SDI was limited to carrying Standard Definition (SD) digital video at 270 Megabits per second (Mbps), but would evolve to higher and higher data rates to carry High Definition 720p, 1080i and 1080p, and most recently 4K Ultra High Definition (UHD) video, at cable lengths that were not thought possible. The convenience of a low cost single conductor coaxial copper cable, capable of carrying 4K video up to 100m has meant that SDI has become the de facto AV connectivity of choice in markets such as broadcast, Pro AV, medical and surveillance.
今すぐ読む