LMH0397 Texas instruments

LMH0397

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LMH0397

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Описание

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.

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

Function	Cable driver, Cable driver with reclocker, Config I/O, Equalizer, Equalizer with reclocker
Supply voltage (V)	2.5
Power consumption (mW)	300
Data rate (max) (MBits)	2970
Control interface	Pin, SMBus, SPI
Operating temperature range (°C)	-40 to 85