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Texas Instruments LMH1228RTVR
- Part No.:
- LMH1228RTVR
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LMH1228RTVR.pdf
- Description:
- IC VIDEO CABLE DRIVER 32WQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMH1228RTVR from Texas Instruments is a 12G UHD-SDI dual-output cable driver with integrated reclocker, supporting SMPTE rates up to 11.88 Gbps and DVB-ASI/MADI compatibility. It features dual 75-Ω SDI outputs (SDI_OUT1±, SDI_OUT2±), one 100-Ω reclocked loop-back output (OUT0±), on-chip 75-Ω termination with return-loss compensation, and adaptive PCB input equalization - deployed in broadcast video routers, 4K/8K distribution amplifiers, and digital video processing systems.
For engineers reviewing the LMH1228RTVR datasheet, LMH1228RTVR pinout, LMH1228RTVR application, or LMH1228RTVR equivalent, key selection considerations include its integrated CDR lock range (270 Mbps–11.88 Gbps), programmable VOD/pre-emphasis on 75-Ω outputs, de-emphasis control on 100-Ω OUT0±, automatic power-save mode (25 mW), and WQFN-32 package compatibility with LMH1208.
Technical Context
The LMH1228RTVR implements a wide-bandwidth clock-and-data recovery (CDR) circuit that autonomously detects and locks to all SMPTE serial digital interface rates - including ST-2082-1 (12G), ST-2081-1 (6G), ST-424 (3G), ST-292 (HD), and ST-259 (SD) - without external reference clock. Its CDR includes built-in loop filter, jitter attenuation, and eye opening monitor (EOM), with lock indication via open-drain LOCK_N pin.
It integrates two independent signal paths: a high-fidelity 75-Ω cable driver path (with automatic slew rate control, polarity inversion, and programmable amplitude/pre-emphasis) and a 100-Ω host-side reclocked differential output (OUT0±) with programmable de-emphasis and amplitude. Control is supported via pin-strapping, SPI, or SMBus interfaces, with 4-level logic inputs for HOST_EQ0, MODE_SEL, OUT_CTRL, and SDI_VOD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 11.88 Gbps - supports full SMPTE 12G UHD-SDI for 4K/8K real-time video transport. |
| CDR Lock Range | 270 Mbps to 11.88 Gbps - covers SD, HD, 3G, 6G, and 12G SMPTE rates plus MADI (125 Mbps bypass). |
| Power Consumption | 305 mW typical at 11.88 Gbps (all outputs enabled except OUT0±); drops to 25 mW in auto power-save mode. |
| Output Termination | On-chip 75-Ω single-ended termination for SDI_OUT1±/SDI_OUT2±; 100-Ω differential termination for OUT0±. |
| Input Equalization | Adaptive PCB EQ on IN0± - compensates up to 20-inch FR4 trace loss at 11.88 Gbps. |
| Jitter Performance | Timing jitter ≤0.45 UI at 12G; alignment jitter ≤0.14 UI - ensures robust signal integrity after reclocking. |
| Supply Voltage | Single 2.5 V ±5% supply (VIN/VDD_CDR); internal 1.8-V LDO (VDD_LDO) powers core logic. |
Pinout & Package
LMH1228RTVR is housed in a 5.00 mm × 5.00 mm, 32-pin WQFN (RTV) package with exposed thermal pad (EP = VSS). The package supports high-speed signal integrity with dedicated ground pins (VSS at pins 3, 6, 20), differential I/O pairs routed to minimize crosstalk, and 4-level logic inputs for flexible configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+/IN0− | Differential input | Host-side 100-Ω terminated SMPTE input; requires external 4.7-µF AC-coupling capacitors. |
| SDI_OUT1+/SDI_OUT1− | 75-Ω cable driver output | Primary SDI output with integrated 75-Ω termination, return-loss network, and automatic pre-emphasis. |
| SDI_OUT2+/SDI_OUT2− | 75-Ω cable driver output | Secondary SDI output, independently enabled via SDI_OUT2_SEL; identical specs to SDI_OUT1±. |
| OUT0+/OUT0− | 100-Ω reclocked loop-back output | Reclocked host-side monitoring/distribution path; supports programmable de-emphasis and amplitude. |
| LOCK_N | Open-drain status indicator | Active-low CDR lock indicator; reconfigurable as signal detect (SD_N) or interrupt (INT_N) via register. |
| ENABLE | LVCMOS enable input | Logic-high enables normal operation; logic-low forces power-down mode (≤30 µA quiescent current). |
| MODE_SEL | 4-level interface select | Strap selects SPI (float) or SMBus (pull-to-VSS) control; determines pin mapping for ADDR[1:0], SDA/SCL vs. MOSI/MISO/SCK. |
| HOST_EQ0 | 4-level input equalizer control | Selects CTLE gain setting for IN0± to optimize signal integrity across varying PCB trace lengths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reclocker with no external reference | Self-contained PLL-based CDR eliminates need for external clock source while attenuating high-frequency jitter. |
| Automatic power save | Reduces power to 25 mW when no valid input signal is detected at IN0± - critical for energy-efficient broadcast infrastructure. |
| On-chip 75-Ω termination + RL compensation | Meets SMPTE return-loss specifications (e.g., –25 dB @ 5 MHz–1.485 GHz) without external components or layout tuning. |
| Programmable VOD and pre-emphasis (75-Ω) | Four selectable output amplitudes (760–880 mVp-p) and 2 dB max pre-emphasis enable precise cable drive optimization. |
| Polarity inversion per output pair | Independent polarity control on SDI_OUT1±, SDI_OUT2±, and OUT0± simplifies board-level signal routing and timing alignment. |
| Eye Opening Monitor (EOM) | On-die diagnostic aids system bring-up and field maintenance by quantifying recovered signal quality in real time. |
Applications
| Broadcast Video Router | Distribution Amplifier |
|---|---|
|
Use Scenario: High-density 12G-SDI signal distribution across multiple output ports in a broadcast production switcher. IC Role / Device Role / Timing Role: Dual 75-Ω cable drivers regenerate and fan-out SMPTE-compliant signals; reclocked OUT0± feeds monitoring subsystem. Use Value: Eliminates inter-port skew and jitter accumulation across 32+ outputs while maintaining SMPTE compliance up to 11.88 Gbps. |
Use Scenario: Signal conditioning and retransmission of 4K UHD video from camera ingest to editing suites and on-air playout. IC Role / Device Role / Timing Role: Reclocker restores signal integrity after long coax runs; adaptive EQ compensates for channel loss before reclocking. Use Value: Enables reliable 4K/8K transmission over >100 m BNC cables without external retimers or discrete equalizers. |
| Video Processing Engine | Studio Monitor Interface |
|
Use Scenario: Integration into FPGA-based video processing boards requiring low-latency, jitter-cleaned SDI I/O for real-time effects rendering. IC Role / Device Role / Timing Role: OUT0± provides reclocked, de-emphasized 100-Ω differential data to FPGA transceivers; SDI_OUT1± drives display outputs. Use Value: Delivers <1.6 UI + 130 ps latency from IN0± to SDI_OUT2±, enabling deterministic timing for frame-synchronized processing. |
Use Scenario: Driving professional-grade 4K monitors in live production trucks where signal fidelity and ESD robustness are mission-critical. IC Role / Device Role / Timing Role: SDI_OUT1± delivers SMPTE-compliant 12G signal with automatic slew rate control and polarity correction. Use Value: Meets SMPTE ST 2082-1 return-loss spec (–25 dB min) without external matching networks - reducing BOM and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12G UHD-SDI cable driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH1208RTVR | Pin-compatible dual 75-Ω cable driver without integrated reclocker or 100-Ω loop-back output. | Suitable only where external CDR or clock source is available; lacks EOM, auto power-save, and OUT0± monitoring path. | Select LMH1208RTVR when reclocking is handled upstream and cost-sensitive designs prioritize minimal feature set. |
| GS2972AIBE3 | 12G SDI reclocker with single 75-Ω output; no dual-output capability or integrated EQ on input. | Requires external equalization for long traces; limited to single-output fanout and lacks programmable VOD/pre-emphasis. | Choose GS2972AIBE3 for compact reclock-only nodes where dual-drive is unnecessary and board space is constrained. |
Compared with LMH1228RTVR, LMH1208RTVR reduces functionality (no CDR, no OUT0±) but lowers power and cost, while GS2972AIBE3 offers reclocking in smaller footprint but sacrifices dual-drive flexibility and adaptive EQ - making LMH1228RTVR optimal for full-featured 12G broadcast infrastructure.
Availability
LMH1228RTVR is available at Aetrix Electronics and suitable for broadcast video routers, 4K/8K distribution amplifiers, and digital video processing equipment requiring stable component supply, long-term lifecycle support, and SMPTE-compliant signal integrity.
Supply support for LMH1228RTVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The LMH1228RTVR belongs to TI's high-speed interface product line, engineered specifically for SMPTE-compliant UHD-SDI infrastructure - emphasizing jitter performance, cable drive robustness, and system-level diagnostics for broadcast and professional video applications.
FAQ
What data rates does the LMH1228RTVR support?
The LMH1228RTVR supports SMPTE serial digital interface rates from 270 Mbps (SD) up to 11.88 Gbps (12G), including ST-2082-1, ST-2081-1, ST-424, ST-292, and ST-259, plus DVB-ASI and AES10 (MADI) compatibility. Its CDR automatically locks to any supported rate without external reference clock, and it enters bypass mode at 125 Mbps for MADI applications.
How does the LMH1228RTVR handle input signal loss?
The LMH1228RTVR features automatic power-save mode that activates when no valid signal is detected at IN0±, reducing power consumption to 25 mW. Signal detection thresholds are programmable, with default ON/OFF levels of 20 mVp-p and 18 mVp-p respectively at 11.88 Gbps. The LOCK_N pin can also be reconfigured to indicate signal presence (SD_N) via register control.
Can the LMH1228RTVR drive both 75-Ω and 100-Ω transmission lines simultaneously?
Yes - the LMH1228RTVR concurrently drives two 75-Ω SDI outputs (SDI_OUT1± and SDI_OUT2±) and one 100-Ω reclocked differential output (OUT0±). Each path is independently configurable: SDI_OUT2_SEL enables/disables SDI_OUT2±, OUT0_SEL enables OUT0±, and OUT_CTRL selects whether the reclocker is active or bypassed for each output path.
What is the purpose of the 4-level logic inputs (e.g., HOST_EQ0, MODE_SEL) on the LMH1228RTVR?
The 4-level logic inputs (HOST_EQ0, MODE_SEL, OUT_CTRL, SDI_VOD) allow configuration without external voltage dividers or level shifters. Each pin interprets four distinct states (L, R, F, H) based on internal resistor straps to VIN or VSS, enabling up to 4× resolution for settings like equalizer gain, interface mode (SPI/SMBus), output routing, and output amplitude - simplifying hardware design and reducing BOM count.
Does the LMH1228RTVR require external termination resistors for its differential I/Os?
No - the LMH1228RTVR integrates 100-Ω differential termination on IN0± and OUT0±, and 75-Ω single-ended termination on SDI_OUT1± and SDI_OUT2±. External 4.7-µF AC-coupling capacitors are required on all high-speed I/Os, and SDI_OUT1±/SDI_OUT2± need external 75-Ω resistors to ground only on the receiver side (not at the LMH1228RTVR output pins).
LMH1228RTVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Driver
- Applications:
- Professional Video
- Standards:
- AES10, DVB-ASI, SMPTE
- Control Interface:
- Serial, SPI
- Voltage - Supply:
- 2.375V ~ 2.625V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-WQFN (5x5)
LMH1228RTVR FAQ
1.How can I place an order for LMH1228RTVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH1228RTVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMH1228RTVR reliable?
The price and inventory of LMH1228RTVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH1228RTVR is usually 5 days.
3.What payment methods are accepted for LMH1228RTVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH1228RTVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH1228RTVR?
LMH1228RTVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH1228RTVR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMH1228RTVR?
For technical support, including LMH1228RTVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH1228RTVR requirements.
6.How does Aetrix verify that LMH1228RTVR is sourced from the original manufacturer or authorized distributors?
All LMH1228RTVR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMH1228RTVR meets industry standards.
7.What is the process for return or replacement of LMH1228RTVR?
All LMH1228RTVR units undergo pre-shipment inspection (PSI). If there is an issue with LMH1228RTVR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMH1228RTVR part is unused and in its original packaging.
Return procedure for LMH1228RTVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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