Semtech GS2994

The GS2994 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 424M, SMPTE292M and SMPTE 259M, and is optimized for performance at 270Mbps, 1.485Gbps and 2.97Gbps.
The GS2994 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 GS2994 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 GS2994 includes a gain selection pin (GAIN_SEL) which, when tied HIGH, compensates for 6dB flat attenuation.
The differential outputs can be DC-coupled to Gennum® 3.3V cable drivers and reclockers and to industry-standard 1.2V, 2.5V and 3.3V CML logic. In general, DC-coupling to any termination voltage between 1.2V and 3.3V is supported.
The GS2994 also includes programmable de-emphasis with three operating levels in order to support long PCB traces. The GS2994 is footprint and drop-in compatible with existing GS2974 and GS2984 designs.
The device is available in a 16-pin, 4mm x 4mm QFN package. Power consumption of the GS2994 is typically 166mW when DC-coupled at 1.2V.
The GS2994 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant.
概览
功能
- 兼容 SMPTE 424M、SMPTE 292M 和 SMPTE 259M
- 自动电缆均衡
- 从 143 Mbps 到 2.97 Gbps 的多标准运行
- Performance optimized for 270Mbps, 1.485Gbps and 2.97Gbps. Typical equalized length of Belden 1694A cable:
- 速率为 2.97 Gbps 时长度为 140 m
- 200m at 1.485Gbps
- 400m at 270Mbps
- Supports DVB-ASI at 270Mbps
- 手动旁路(适用于具有缓慢上升/下降时间的低数据速率)
- 可编程的载波检测和抑制阀值调节
- 信号丢失时自动断电
- 备用电源 < 30 mW(典型值)
- 差分输出,支持从 1.2 V 到 -> 3.3 V CML 逻辑的直流耦合
- 0/6 dB gain boost selection pin • Selectable de-emphasis: 2dB, 4dB and 6dB
- 标准 EIA/JEDEC 逻辑控制和状态信号水平
- 3.3 V 单电源运行
- 功耗为 166 mW(典型值)
- 工作温度范围宽(-40℃ 至 +85℃)
- 小型 QFN 封装 (4 mm x 4 mm)
- 封装与 GS2974 和 GS2984 兼容
- 无铅且符合 RoHS 标准
应用
- SMPTE 424M、SMPTE 292M 和 SMPTE 259M 同轴电缆串行数字接口
订购代码
- GS2994-INE3: Lead-Free, RoHS Compliant, Tray-490 Pieces
- GS2994-INTE3: Lead-Free, RoHS Compliant, Tape and Reel-250 Pieces
- GS2994-INTE3Z: Lead-Free, RoHS Compliant, Tape and Reel-2500 Pieces