深圳市昱德鸿电子有限公司

1 Features 

1• User-configurable adaptive cable equalizer or cable driver with integrated reclocker • Supports ST-424 (3G), ST-292 (HD), and ST-259 (SD) • Compatible with DVB-ASI and AES10 (MADI) • Integrated reclocker locks to SMPTE rates of 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 subrates and 270 Mbps • On-Chip 75-Ω termination and return loss compensation network • EQ (equalizer) mode: – Adaptive cable equalizer with integrated reclocker – 100-Ω Output driver with de-emphasis – Reclocked 75-Ω loop-through output – EQ mode cable reach (Belden 1694A, SDI_OUT Disabled): – 200 m at 2.97 Gbps – 300 m at 1.485 Gbps – 600 m at 270 Mbps • CD (cable driver) mode: – Dual differential output cable drivers with integrated reclocker – Adaptive PCB input equalizer – Reclocked 100-Ω loopback output • Automatic pre-emphasis and slew rate control on 75-Ω outputs • Polarity inversion on 75-Ω and 100-Ω outputs • Automatic power save in absence of input signal – Power dissipation: 25 mW (typical) • Power-down control through ENABLE pin • Single 2.5-V supply – EQ mode power dissipation: 275 mW (typical) – CD mode power dissipation: 290 mW (typical) • Programmable through pins, SPI, or SMBus interface • –40°C to +85°C Operating temperature range • 5-mm × 5-mm, 32-Pin WQFN package • Pin compatible with the LMH1297 for easy upgrade to 12G-SDI 

2 Applications 

• SMPTE compatible serial digital interface • UHDTV/4K/8K/HDTV/SDTV video • IP media gateway • Digital video processing and editing

3 Description 

The LMH0397 is a 3G-SDI 75-Ω bidirectional I/O with integrated reclocker. This device can be configured either in input mode as an adaptive cable equalizer or in output mode as a dual cable driver, allowing system designers the flexibility to use a single BNC either as an input or output port to simplify HD-SDI video hardware designs. The integrated reclocker locks to all supported SMPTE data rates up to 2.97 Gbps in both modes. The bidirectional I/O has an onchip 75-Ω termination and return loss compensation network that meets the stringent SMPTE return loss requirements. An additional 75-Ω driver output allows the LMH0397 to support a variety of system functions. In EQ (Equalizer) Mode, this second 75-Ω driver can be used as a loop-through output. In Cable Driver (CD) Mode, this 75-Ω driver can be used as a second fanout cable driver. The host-side 100-Ω driver can also be used as a loopback output in CD Mode for monitoring purposes.