SNOSDC1 June   2024 LMH1229

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements for Serial Management (SM) Bus Interface
    7. 5.7 Timing Requirements for Serial Parallel Interface (SPI) Interface
    8. 5.8 Typical Characteristics
      1. 5.8.1 TX Characteristics
      2. 5.8.2 RX Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 4-Level Input Pins and Thresholds
      2. 6.3.2 Input and Output Signal Flow Control
        1. 6.3.2.1 Input Mux Selection (LMH1239 Only)
        2. 6.3.2.2 Output Mux and SDI_OUT Selection
      3. 6.3.3 Input Carrier Detect
      4. 6.3.4 Adaptive Cable Equalizer (SDI_IN±, SDI_IN1±)
      5. 6.3.5 Clock and Data (CDR) Recovery
      6. 6.3.6 CDR Loop Bandwidth Control
      7. 6.3.7 Output Function Control
      8. 6.3.8 Output Driver Control
        1. 6.3.8.1 Line-Side 75Ω Output Cable Driver (SDI_OUT±)
          1. 6.3.8.1.1 Output Amplitude (VOD)
          2. 6.3.8.1.2 Output Pre-Emphasis
          3. 6.3.8.1.3 Output Slew Rate
          4. 6.3.8.1.4 Output Polarity Inversion
        2. 6.3.8.2 Host-Side 100Ω Output Driver (OUT0±, OUT1±)
      9. 6.3.9 Debug and Diagnostic Features
        1. 6.3.9.1 Internal Eye Opening Monitor (EOM)
        2. 6.3.9.2 PRBS Generator, Error Checker, and Error Injector
        3. 6.3.9.3 Status Indicators and Interrupts
          1. 6.3.9.3.1 LOCK_N (Lock Indicator)
          2. 6.3.9.3.2 CD_N (Carrier Detect)
          3. 6.3.9.3.3 Cable Fault Detection (SDI_OUT+ Only)
          4. 6.3.9.3.4 INT_N (Interrupt)
        4. 6.3.9.4 Additional Programmability
          1. 6.3.9.4.1 Cable EQ Index (CEI)
          2. 6.3.9.4.2 Digital MUTEREF
    4. 6.4 Device Functional Modes
      1. 6.4.1 System Management Bus (SMBus) Mode
        1. 6.4.1.1 SMBus Read and Write Transaction
          1. 6.4.1.1.1 SMBus Write Operation Format
          2. 6.4.1.1.2 SMBus Read Operation Format
      2. 6.4.2 Serial Peripheral Interface (SPI) Mode
        1. 6.4.2.1 SPI Read and Write Transactions
          1. 6.4.2.1.1 SPI Write Transaction Format
          2. 6.4.2.1.2 SPI Read Transaction Format
        2. 6.4.2.2 SPI Daisy Chain
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 SMPTE Requirements and Specifications
      2. 7.1.2 Optimizing the Time to Adapt and Lock
      3. 7.1.3 Optimized Loop Bandwidth Settings for Diagnostic or Cascade Applications
      4. 7.1.4 LMH1229 and LMH1297 (EQ Mode) Pin-to-Pin Compatibility
    2. 7.2 Typical Application
      1. 7.2.1 Cable Equalizer With Loop-Through
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Cable Equalizer With Redundant SDI Input (LMH1239 only)
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Board Stack-Up and Ground References
        2. 7.4.1.2 High-Speed PCB Trace Routing and Coupling
          1. 7.4.1.2.1 SDI_IN± and SDI_OUT±:
          2. 7.4.1.2.2 OUT0± and OUT1±:
        3. 7.4.1.3 Anti-Pads
        4. 7.4.1.4 BNC Connector Layout and Routing
        5. 7.4.1.5 Power Supply and Ground Connections
        6. 7.4.1.6 Footprint Recommendations
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Packaging Option Addendum
    2. 10.2 Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

4 Pin Configuration and Functions

LMH1229 LMH1239 LMH1229 RTV Package, 32-Pin QFN (Top View)Figure 4-1 LMH1229 RTV Package, 32-Pin QFN (Top View)
LMH1229 LMH1239 LMH1239 RTV Package, 32-Pin QFN (Top View)Figure 4-2 LMH1239 RTV Package, 32-Pin QFN (Top View)
Legend
High Speed Signals Serial Control Interface (SPI or SMBus) Pins Reserved Pins
Control Pins Power (2.5 V) LDO Output (1.8 V) GND
Table 4-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME LMH1229 NO. LMH1239 NO.
HIGH SPEED DIFFERENTIAL I/Os
SDI_IN+ 1 1 I, Analog Single-ended complementary inputs with on-chip 75Ω termination at SDI_IN+ and SDI_IN-. Either SDI_IN+ or SDI_IN- can be used as the 75Ω input port of the adaptive cable equalizer for SMPTE video applications. SDI_IN± include integrated return loss networks designed to meet the SMPTE input and output return loss requirements.
Connect either SDI_IN+ or SDI_IN- to a BNC through a 4.7µF AC coupling capacitor. AC terminate the unused polarity (SDI_IN- or SDI_IN+, respectively) with external 4.7µF and 75Ω to GND.
SDI_IN- 2 2 I, Analog
SDI_IN1+ N/A 29 I, Analog Redundant single-ended complementary inputs with on-chip 75Ω termination at SDI_IN1+ and SDI_IN1-. Either SDI_IN1+ or SDI_IN1- can be used as a secondary 75Ω input port of the adaptive cable equalizer for SMPTE video applications. SDI_IN1± include integrated return loss networks designed to meet the SMPTE input and output return loss requirements.
Connect either SDI_IN1+ or SDI_IN1- to a BNC through a 4.7µF AC coupling capacitor. AC terminate the unused polarity (SDI_IN- or SDI_IN+, respectively) with external 4.7µF and 75Ω to GND.
SDI_IN1- N/A 30 I, Analog
SDI_OUT+ 8 8 O, Analog Single-ended complementary loop-through cable driver outputs with on-chip 75Ω termination at SDI_OUT+ and SDI_OUT-. SDI_OUT± include integrated return loss networks designed to meet the SMPTE output return loss requirements.
Connect either SDI_OUT+ or SDI_OUT- to a BNC through a 4.7µF AC coupling capacitor.
AC terminate the unused polarity (SDI_IN- or SDI_IN+, respectively) with external 4.7µF and 75Ω to GND.
Note that Cable Fault Detection is only available when using the SDI_OUT+ polarity.
SDI_OUT- 7 7 O, Analog
OUT0+ 23 23 O, Analog Differential complementary outputs with 100Ω internal termination. Requires external 4.7µF AC coupling capacitors. Output driver OUT0± can be disabled under user control.
OUT0- 22 22 O, Analog
OUT1+ 19 19 O, Analog Differential complementary outputs with 100Ω internal termination. Requires external 4.7µF AC coupling capacitors. Output driver OUT1± can be disabled under user control.
OUT1- 18 18 O, Analog
CONTROL PINS
LOOP_BW_SEL 4 4 I, 4-Level LOOP_BW_SEL enables 4-level CDR loop bandwidth control. Additional CDR loop bandwidth settings are available by register override.
IN_MUX_SEL N/A 10 I, 4-Level LMH1239 Only: IN_MUX_SEL selects between SDI_IN or SDI_IN1. This pin setting can be overridden by register control.
See Table 6-3 for details.
OUT_MUX_SEL 5 5 I, 4-Level OUT_MUX_SEL controls OUT0± and OUT1± enable behavior. This pin setting can be overridden using register control.
See Table 6-3 for details.
VOD_DE 9 9 I, 4-Level VOD_DE selects the driver output amplitude and de-emphasis level for both OUT0± and OUT1±. This pin setting can be overridden by register control.
See Table 6-8 for details.
MODE_SEL 12 12 I, 4-Level MODE_SEL enables SPI or SMBus serial control interface.
See Table 6-9 for details.
SDI_OUT_SEL 14 14 I, LVCMOS SDI_OUT_SEL enables the use of the 75Ω output driver at SDI_OUT±. SDI_OUT_SEL is internally pulled high. The SDI_OUT± is turned off by default.
See Table 6-4 for details.
LF+ 15 15 I, Analog Optional 470nF external loop filter capacitor connected between LF+ and LF- for reduced CDR loop bandwidth settings. If reduced CDR loop bandwidth is not required, these pins must be left floating (no connect).
LF- 16 16 I, Analog
OUT_CTRL 17 17 I, 4-Level OUT_CTRL selects the signal flow from the SDI input (either SDI_IN± or SDI_IN1±) to OUT0± and OUT1±. It selects reclocked data, reclocked data and clock, or bypassed reclocker data (equalized data to output driver). This pin setting can be overridden by register control.
See Table 6-6 for details.
SDI_VOD 24 24 I, 4-Level SDI_VOD selects one of four output amplitudes for the cable drivers at SDI_IO± and SDI_OUT±.
See Table 6-7 for details.
LOCK_N 27 25 O, LVCMOS, OD LOCK_N is the reclocker lock indicator for the selected input. LOCK_N is pulled LOW when the reclocker has acquired locking condition. LOCK_N is an open drain output, 3.3V tolerant, and requires an external 2kΩ to 5kΩ pullup resistor to logic supply. LOCK_N pin can be re-configured to indicate CD_N (Carrier Detect), Cable Fault Detect (CFD_N), or INT_N (Interrupt) for the selected SDI input through register programming.
ENABLE 32 32 I, LVCMOS ENABLE controls device operation. A logic-low on ENABLE configures device in power down state. A logic-high on ENABLE configures the device in normal operation. ENABLE has an internal weak pull up.
SERIAL CONTROL INTERFACE
CS_N_ADDR0 11 11 SPI Mode:
I, LVCMOS
SMBus Mode:
Strap, 4-Level		 SPI Mode (MODE_SEL = F): CS_N
CS_N is the Chip Select. When CS_N is at logic Low, the pin enables SPI access to the LMH12x9 peripheral device. CS_N is a LVCMOS input pulled high by default.
SMBus Mode (MODE_SEL = L): ADDR0
ADDR[1:0] are SMBus address straps to select one of the 16 supported SMBus addresses. ADDR[1:0] are 4-level straps and are read into the device at power up. See Table 6-10 for details.
POCI_ADDR1 28 26 SPI Mode:
O, LVCMOS
SMBus Mode:
Strap, 4-Level		 SPI Mode (MODE_SEL = F): POCI
POCI "Peripheral Output Controller Input" is the SPI control serial data output from the LMH12x9 peripheral device. POCI is a LVCMOS output referenced to VIN.
SMBus Mode (MODE_SEL = L): ADDR1
ADDR[1:0] are SMBus address straps to select one of the 16 supported SMBus addresses. ADDR[1:0] are 4-level straps and are read into the device at power up. See Table 6-10 for details.
PICO_SDA 13 13 SPI Mode:
I, LVCMOS
SMBus Mode:
IO, LVCMOS, OD		 SPI Mode (MODE_SEL = F): PICO
PICO "Peripheral Input Controller Output" is used as the SPI control serial data input to the LMH12x9 peripheral device. PICO is LVCMOS input referenced to VIN
SMBus Mode (MODE_SEL = L): SDA
SDA is the SMBus bi-directional open drain SDA data line to or from the LMH12x9 target device. SDA is an open drain IO and 3.3V tolerant. SDA requires an external 2kΩ to 5kΩ pullup resistor to the SMBus termination voltage.
SCK_SCL 29 27 SPI Mode:
I, LVCMOS
SMBus Mode:
I, LVCMOS, OD 		SPI Mode (MODE_SEL = F): SCK
SCK is the SPI serial input clock to the LMH12x9 peripheral device. SCK is LVCMOS referenced to VIN.
SMBus Mode (MODE_SEL = L): SCL
SCL is the SMBus input clock to the LMH12x9 target device when SMBus is enabled. The pin is driven by a LVCMOS open drain driver from the SMBus controller and is 3.3V tolerant. SCL requires an external 2kΩ to 5kΩ pullup resistor to the SMBus termination voltage.
RESERVED
RSV1 10 N/A N/A Reserved pins. Do not connect.
RSV2 25 N/A
RSV3 26 N/A
POWER
VSS 3, 6, 20 3, 6, 20 I, Ground Ground reference.
VIN 30, 21 28, 21 I, Power VIN should be connected to the same external 2.5V ± 5% power supply. TI recommends to place decoupling capacitors as close as possible to both VIN pins.
VDD_LDO 31 31 O, Power VDD_LDO is the output of the internal 1.8V LDO regulator. VDD_LDO output requires an external 1µF and 0.1µF 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 QFN package. The exposed pad must be connected to the ground plane through a 3x3 via array.
(1) I = Input, O = Output, IO = Input or Output, OD = Open Drain, LVCMOS = 2-State Logic, 4-LEVEL = 4-State Logic