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  • LMH1208 12G UHD-SDI Dual Output Cable Driver

    • SNLS569C March   2017  – May 2020 LMH1208

      PRODUCTION DATA.  

  • CONTENTS
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  • LMH1208 12G UHD-SDI Dual Output Cable Driver
  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Block Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Recommended SMBus Interface Timing Specifications
    7. 6.7 Serial Parallel Interface (SPI) Timing Specifications
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 4-Level Input Pins and Thresholds
      2. 7.3.2 OUT0_SEL and SDI_OUT2_SEL Control
      3. 7.3.3 Input Signal Detect
      4. 7.3.4 Continuous Time Linear Equalizer (CTLE)
      5. 7.3.5 Output Driver Control
        1. 7.3.5.1 Line-Side Output Cable Driver (SDI_OUT1+, SDI_OUT2+)
          1. 7.3.5.1.1 Output Amplitude (VOD)
          2. 7.3.5.1.2 Output Pre-Emphasis
          3. 7.3.5.1.3 Output Slew Rate
          4. 7.3.5.1.4 Output Polarity Inversion
        2. 7.3.5.2 Host-Side 100-Ω Output Driver (OUT0±)
      6. 7.3.6 Status Indicators and Interrupts
        1. 7.3.6.1 SD_N (Signal Detect)
        2. 7.3.6.2 INT_N (Interrupt)
    4. 7.4 Device Functional Modes
      1. 7.4.1 System Management Bus (SMBus) Mode
        1. 7.4.1.1 SMBus Read and Write Transaction
          1. 7.4.1.1.1 SMBus Write Operation Format
          2. 7.4.1.1.2 SMBus Read Operation Format
      2. 7.4.2 Serial Peripheral Interface (SPI) Mode
        1. 7.4.2.1 SPI Read and Write Transactions
        2. 7.4.2.2 SPI Write Transaction Format
        3. 7.4.2.3 SPI Read Transaction Format
        4. 7.4.2.4 SPI Daisy Chain
    5. 7.5 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 SMPTE Requirements and Specifications
      2. 8.1.2 LMH1208 and LMH1228 Compatibility
    2. 8.2 Typical Applications
      1. 8.2.1 Dual Cable Driver
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Distribution Amplifier
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Board Stack-Up and Ground References
      2. 10.1.2 High-Speed PCB Trace Routing and Coupling
      3. 10.1.3 Anti-Pads
      4. 10.1.4 BNC Connector Layout and Routing
      5. 10.1.5 Power Supply and Ground Connections
      6. 10.1.6 Footprint Recommendations
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Export Control Notice
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum
      1. 12.1.1 Packaging Information
      2. 12.1.2 Tape and Reel Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RTV|32
    • MPQF166B
Thermal pad, mechanical data (Package|Pins)
  • RTV|32
    • QFND101J
Orderable Information
  • snls569c_oa
  • snls569c_pm
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DATA SHEET

LMH1208 12G UHD-SDI Dual Output Cable Driver

1 Features

  • Supports ST-2082-1 (12G), ST-2081-1 (6G), ST-424 (3G), ST-292 (HD), and ST-259 (SD)
  • Compatible with DVB-ASI and AES10 (MADI)
  • Dual differential output cable drivers
  • On-chip 75-Ω termination and return loss compensation network
  • Host-side equalized 100-Ω loop-back output
  • Programmable slew rate control on 75-Ω outputs
  • Programmable pre-emphasis and output amplitude on 75-Ω outputs
  • Programmable de-emphasis and output amplitude on 100-Ω output
  • Polarity inversion on 75-Ω and 100-Ω outputs
  • Automatic power save in absence of input signal
    • Power consumption: 25 mW (Typical)
  • Power-down control through ENABLE pin
  • Single 2.5-V supply
    • Power consumption: 200 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

2 Applications

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

3 Description

LMH1208 device is a 12G UHD-SDI low power dual output cable driver. It supports SMPTE video rates up to 11.88 Gbps, enabling UHD video for 4K/8K applications. The additional equalized 100-Ω driver output on the host-side can be used for monitoring or signal distribution purposes.

The programmable PCB input equalizer provides high frequency boost to reduce inter symbol interference (ISI) induced by PCB board trace. The integrated 75-Ω termination and return loss network at both cable driver outputs facilitate overall system design in meeting stringent SMPTE return loss requirements.

Input Signal Detect determines the presence of a valid signal at the input of the cable driver. This sensing feature may be used to alert the user of a system fault and activate a Power Save Mode, reducing the power consumption of the cable driver. The LMH1208 provides selectable slew rates for data rates up to 11.88 Gbps. The output slew rate and amplitude can be controlled by pin, SPI, or SMBus control.

The LMH1208 is powered from a single 2.5-V supply. It is offered in a small footprint 5 mm × 5 mm 32-pin WQFN package. The LMH1208 is pin compatible with the LMH1228 (12G Dual Cable Driver with Integrated Reclocker).

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LMH1208 WQFN (32) 5.00 mm × 5.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Block Diagram

LMH1208 front_page_block_diagram_lmh1208_snls569.gif

4 Revision History

Changes from B Revision (October 2019) to C Revision

  • Changed HBM Ratings and added pin 27 description Go

Changes from A Revision (September 2017) to B Revision

  • Initial Public Release Go

5 Pin Configuration and Functions

RTV Package
32-Pin WQFN
Top View
LMH1208 pin_out_diagram_snls569.gif

Pin Functions

PIN I/O(1) DESCRIPTION
NAME NO.
HIGH-SPEED DIFFERENTIAL I/OS
SDI_OUT1+ 1 I/O, Analog Single-ended complementary outputs with on-chip 75-Ω termination at SDI_OUT1+ and SDI_OUT1–. SDI_OUT1± include integrated return loss networks designed to meet the SMPTE output return loss requirements. Connect SDI_OUT1+ to a BNC through a 4.7-µF, AC-coupling capacitor. SDI_OUT1– should be similarly AC-coupled and terminated with an external 4.7-µF capacitor and 75-Ω resistor to GND.
SDI_OUT1– 2 I/O, Analog
SDI_OUT2+ 8 O, Analog Single-ended complementary outputs with on-chip 75-Ω termination at SDI_OUT2+ and SDI_OUT2–. SDI_OUT2± include integrated return loss networks designed to meet the SMPTE output return loss requirements. SDI_OUT2± is used as a second cable driver. Connect SDI_OUT2+ to a BNC through a 4.7-µF, AC-coupling capacitor. SDI_OUT2– should be similarly AC-coupled and terminated with an external 4.7-µF capacitor and 75-Ω resistor to GND.
SDI_OUT2– 7 O, Analog
IN0+ 19 I, Analog Differential inputs from host video processor. On-chip 100-Ω differential termination. Requires external 4.7-µF, AC-coupling capacitors for SMPTE applications.
IN0– 18 I, Analog
OUT0+ 23 O, Analog Differential outputs to host video processor. On-chip 100-Ω differential termination. Requires external 4.7-µF, AC-coupling capacitors for SMPTE applications.
OUT0– 22 O, Analog
CONTROL PINS
OUT0_SEL 4 I, LVCMOS OUT0_SEL enables the use of the 100-Ω host-side output driver at OUT0±.
See Table 2 for details.
OUT0_SEL is internally pulled high by default (OUT0 disabled).
HOST_EQ0 9 I, 4-LEVEL HOST_EQ0 selects the equalizer setting for IN0±.
See Table 4 for details.
MODE_SEL 12 I, 4-LEVEL MODE_SEL enables the SPI or SMBus serial control interface.
See Table 8 for details.
SDI_OUT2_SEL 14 I, LVCMOS SDI_OUT2_SEL enables the use of the 75-Ω output driver at SDI_OUT2±.
See Table 2 for details.
SDI_OUT2_SEL is internally pulled high by default (SDI_OUT2 disabled).
SLEW_CTRL 17 I, 4-LEVEL SLEW_CTRL selects the edge rate for both cable driver outputs. SLEW_CTRL settings are dependent on the operating SMPTE data rate.
SLEW_CTRL also determines the pre-emphasis level applied to both cable driver outputs.
See Table 6 and Table 7 for details.
SDI_VOD 24 I, 4-LEVEL SDI_VOD selects one of four output amplitudes for the cable drivers at SDI_OUT1± and SDI_OUT2±.
See Table 5 for details.
SD_N 27 O, LVCMOS,
OD		 SD_N is the Signal Detect indicator. SD_N is pulled low when signal is detected at IN0±. SD_N is a 3.3-V tolerant, open-drain output. It requires an external resistor to a logic supply.
SD_N can be reconfigured to indicate Interrupt (INT_N) through register programming. See Status Indicators and Interrupts.
ENABLE 32 I, LVCMOS A logic-high at ENABLE enables normal operation for the LMH1208. A logic-low at ENABLE places the LMH1208 in Power-Down Mode.
ENABLE is internally pulled high by default.
SPI SERIAL CONTROL INTERFACE, MODE_SEL = F (FLOAT)
SS_N 11 I, LVCMOS SS_N is the Slave Select. When SS_N is at logic low, it enables SPI access to the LMH1208 slave device.
SS_N is a 2.5-V LVCMOS input and is internally pulled high by default.
MOSI 13 I, LVCMOS MOSI is the SPI serial control data input to the LMH1208 slave device when the SPI bus is enabled. MOSI is a 2.5-V LVCMOS input.
An external pullup resistor is recommended.
MISO 28 O, LVCMOS MISO is the SPI serial control data output from the LMH1208 slave device.
MISO is a 2.5-V LVCMOS output.
SCK 29 I, LVCMOS SCK is the SPI serial input clock to the LMH1208 slave device when the SPI interface is enabled. SCK is a 2.5-V LVCMOS input.
An external pullup resistor is recommended.
SMBUS SERIAL CONTROL INTERFACE, MODE_SEL = L (1 KΩ TO VSS)
ADDR0 11 Strap, 4-LEVEL ADDR[1:0] are 4-level straps, read into the device at power up. They are used to select one of the 16 supported SMBus addresses when SMBus is enabled. See Table 9 for details.
SDA 13 I/O, LVCMOS,
OD		 SDA is the SMBus bidirectional data line to or from the LMH1208 slave device when SMBus is enabled. SDA is an open-drain I/O and requires an external pullup resistor to the SMBus termination voltage. SDA is 3.3-V tolerant.
ADDR1 28 Strap, 4-LEVEL ADDR[1:0] are 4-level straps, read into the device at power up. They are used to select one of the 16 supported SMBus addresses when SMBus is enabled. See Table 9 for details.
SCL 29 I/O, LVCMOS,
OD		 SCL is the SMBus input clock to the LMH1208 slave device when SMBus is enabled. It is driven by a LVCMOS open-drain driver from the SMBus master. SCL requires an external pullup resistor to the SMBus termination voltage. SCL is 3.3-V tolerant.
RESERVED
RSV1
RSV2
RSV3
RSV4
RSV5
RSV6		 10
15
16
25
26
5		 — Reserved pins. Do not connect.
POWER
VSS 3, 6, 20 I, Ground Ground reference.
RSV_L 21 I, Power Connect RSV_L to the same 2.5-V ± 5% supply as VIN.
VIN 30 I, Power VIN is connected to an external 2.5-V ± 5% power supply.
VDD_LDO 31 O, Power VDD_LDO is the output of the internal 1.8-V LDO regulator. VDD_LDO output requires an external 1-µF and 0.1-µF bypass capacitor to VSS. The internal LDO is designed to power internal circuitry only.
EP — I, Ground EP is the exposed pad at the bottom of the RTV package. The exposed pad should be connected to the VSS plane through a 3 × 3 via array.
(1) I = Input, O = Output, I/O = Input or Output, OD = Open Drain, LVCMOS = 2-State Logic, 4-LEVEL = 4-State Logic

 
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