LMH0397 LMH0397 3G-SDI Bidirectional I/O with Integrated Reclocker | TI.com

LMH0397
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LMH0397 3G-SDI Bidirectional I/O with Integrated Reclocker

 

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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 on-chip 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 fan-out cable driver. The host-side 100-Ω driver can also be used as a loopback output in CD Mode for monitoring purposes.

The on-chip reclocker attenuates high-frequency jitter and fully regenerates the data using a clean, low-jitter clock. The reclocker has a built-in loop filter and does not require any input reference clock. The LMH0397 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, or hardware interrupts to support system diagnostics and board bring-up.

The LMH0397 is powered from a single 2.5-V supply. The device is offered in a small 5-mm × 5-mm, 32-pin WQFN package. The LMH0397 is also pin-compatible with the LMH1297.

Features

  • 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

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Parametrics

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Part number Order Function Data rate (Max) (Gbps) Power consumption (mW) Control interface Package Group Package size: mm2:W x L (PKG) Operating temperature range (C)
LMH0397 Order now Cable driver
Cable driver with reclocker
Config I/O
Equalizer
Equalizer with reclocker    
2.97     300     Pin
SMBus
SPI    
WQFN | 32     32WQFN: 25 mm2: 5 x 5 (WQFN | 32)     -40 to 85    
LMH1297 Order now Cable driver
Cable driver with reclocker
Config I/O
Equalizer
Equalizer with reclocker    
11.88     300     Pin
SMBus
SPI    
WQFN | 32     32WQFN: 25 mm2: 5 x 5 (WQFN | 32)     -40 to 85