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Texas Instruments LMH1208RTVT
- Part No.:
- LMH1208RTVT
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LMH1208RTVT.pdf
- Description:
- IC VIDEO CABLE DRIVER 32WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:221
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Product details
Overview
LMH1208RTVT from Texas Instruments is a 12G UHD-SDI dual-output cable driver IC supporting SMPTE ST-2082-1 (11.88 Gbps), ST-2081-1 (6G), and legacy SD/HD rates. It features two 75-Ω differential cable drivers (SDI_OUT1±, SDI_OUT2±) with integrated return-loss compensation, one 100-Ω host-side loop-back output (OUT0±), programmable slew rate and VOD, and automatic signal-detect–triggered power save mode. It is used in broadcast-grade 4K/8K video routing and IP media gateways.
For engineers reviewing the LMH1208RTVT datasheet, LMH1208RTVT pinout, LMH1208RTVT application, or LMH1208RTVT equivalent, this page delivers verified electrical specs, confirmed WQFN-32 package mapping, validated pin functions per TI SNLS569C Rev C, real-world return loss and jitter performance at 12G, and two technically documented alternative parts for UHD-SDI cable driving applications.
Technical Context
The LMH1208RTVT implements a continuous-time linear equalizer (CTLE) on its IN0± input to compensate for PCB trace loss up to 20 inches, enabling robust signal integrity at 11.88 Gbps. Its dual 75-Ω outputs support independent enable control (SDI_OUT2_SEL), programmable pre-emphasis (up to 2 dB), and four-step VOD selection (760–880 mVp-p).
The 100-Ω OUT0± output provides host-side monitoring with configurable de-emphasis and amplitude (410–810 mVp-p), while internal logic supports pin-strapped, SPI, or SMBus configuration across all key parameters - including slew rate, EQ level (HOST_EQ0), and power-down (ENABLE). Signal Detect (SD_N) asserts low upon valid input detection, triggering automatic 25-mW power-save operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Support | Up to 11.88 Gbps (SMPTE ST-2082-1), also compliant with ST-2081-1, ST-424, ST-292, ST-259, DVB-ASI, AES10 |
| Power Dissipation | 200 mW typical at 11.88 Gbps with SDI_OUT1± enabled; drops to 25 mW in signal-absent power-save mode |
| Output Termination | On-chip 75-Ω single-ended termination at SDI_OUT1±/SDI_OUT2±; 100-Ω differential termination at OUT0± |
| Return Loss Performance | ≥ –25 dB (5 MHz–1.485 GHz) at SDI_OUT1±/SDI_OUT2±; ≥ –24 dB (10 MHz–2.8 GHz) at OUT0± per SMPTE compliance |
| Additive Jitter | 0.03 UI typical at 12G/6G/3G/HD/SD rates - meets broadcast timing stability requirements |
| Supply Voltage | Single 2.5-V ±5% supply (VIN); internal 1.8-V LDO (VDD_LDO) powers core logic |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and broadcast equipment environments |
Pinout & Package
LMH1208RTVT is housed in a 5.00 mm × 5.00 mm, 32-pin WQFN package (RTV suffix) with exposed thermal pad (EP = VSS). The package supports high-speed signal integrity via controlled impedance routing and requires 3×3 thermal vias under EP for junction-to-board thermal resistance of 6.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+/IN0– | Differential video input | 100-Ω on-chip termination; accepts SMPTE-compliant AC-coupled signals up to 11.88 Gbps |
| SDI_OUT1+/SDI_OUT1– | Primary 75-Ω cable driver output | Always enabled; includes integrated return-loss network meeting SMPTE RL spec up to 12 GHz |
| SDI_OUT2+/SDI_OUT2– | Secondary 75-Ω cable driver output | Enabled/disabled via SDI_OUT2_SEL pin; identical electrical specs and RL performance to SDI_OUT1± |
| OUT0+/OUT0– | Host-side 100-Ω loop-back output | Enabled via OUT0_SEL; supports monitoring/distribution with programmable de-emphasis and VOD |
| ENABLE | Global power control | Logic-high enables full operation; logic-low forces power-down mode (≤30 µA quiescent current) |
| SD_N | Signal detect indicator | Open-drain output pulled low when valid signal detected at IN0±; configurable as interrupt (INT_N) |
| SLEW_CTRL / SDI_VOD / HOST_EQ0 | 4-level configuration inputs | Resistor-strapped pins selecting edge rate, output amplitude (760–880 mVp-p), and input EQ gain |
| MODE_SEL | Interface mode select | Configures serial interface: float = SPI (SS_N/MOSI/MISO/SCK); low = SMBus (ADDR0/ADDR1/SDA/SCL) |
Key Features
| Feature | Design Value |
|---|---|
| Dual 75-Ω cable drivers with integrated RL networks | Eliminates need for external 75-Ω termination and discrete return-loss compensation circuitry on PCB |
| Programmable slew rate & pre-emphasis | Four selectable edge rates and 2-dB max pre-emphasis optimize eye opening for varying cable lengths and data rates |
| Host-side 100-Ω loop-back output | Enables real-time signal monitoring without external splitters or taps - critical for broadcast fault isolation |
| Automatic signal-detect power save | Reduces power from 200 mW to 25 mW when no valid input is present - extends thermal headroom in dense video systems |
| Multi-mode serial configuration | Pin-strapped, SPI, or SMBus control allows flexible integration into FPGA-based, microcontroller-managed, or I²C-bus systems |
Applications
| Broadcast Video Routing | IP Media Gateway |
|---|---|
Use Scenario: Distribution of uncompressed 4K/8K UHD-SDI signals across redundant fiber or coaxial links in OB vans and broadcast studios. IC Role / Device Role / Timing Role: Dual-output cable driver conditioning and re-driving serial digital video streams with SMPTE-compliant return loss and jitter. Use Value: Enables simultaneous feed to primary monitor, backup recorder, and IP encoder - all from a single host video processor output. |
Use Scenario: Bridging baseband SDI video into IP-based transport (e.g., SMPTE ST 2110) using FPGA-based media gateways. IC Role / Device Role / Timing Role: High-fidelity signal recovery and re-driving at the SDI ingress stage prior to digitization and packetization. Use Value: Maintains signal integrity through long PCB traces between SDI connectors and FPGA transceivers - reducing bit errors in time-critical ST 2110 flows. |
| Digital Video Processing | Professional Video Editing System |
Use Scenario: Real-time color grading and effects rendering in multi-channel 4K editing workstations with hardware-accelerated I/O. IC Role / Device Role / Timing Role: Low-jitter re-driver for loop-back monitoring path (OUT0±) and clean output distribution (SDI_OUT1±/SDI_OUT2±). Use Value: Provides deterministic latency and sub-0.03 UI additive jitter - essential for frame-accurate preview and playback synchronization. |
Use Scenario: Integrated monitoring and recording paths in compact 4K editing appliances with dual SDI I/O and HDMI output. IC Role / Device Role / Timing Role: Dual-output driver delivering synchronized feeds to internal decoder and external reference monitor. Use Value: Eliminates external passive splitters and associated signal degradation - preserving eye diagram margin for reliable 12G operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHD-SDI cable driving applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH1228RTVT | Pin-compatible with LMH1208RTVT but adds integrated reclocker; higher power (320 mW typ); same 32-pin WQFN package | Required when input jitter tolerance must exceed 0.3 UI - e.g., in long-haul fiber-receiver interfaces | Select LMH1228RTVT only if reclocking is needed; LMH1208RTVT suffices for clean source signals with <0.15 UI input jitter. |
| GS12021-IBE3 | Single 75-Ω output (not dual); supports same SMPTE rates; uses 40-pin QFN; lacks host-side 100-Ω loop-back output | Suitable for space-constrained single-output designs where monitoring is handled externally | Choose GS12021-IBE3 when board area is critical and dual outputs or loop-back are unnecessary. |
Compared with LMH1208RTVT, LMH1228RTVT adds reclocking at the cost of higher power and no reduction in feature set, while GS12021-IBE3 trades dual outputs and loop-back capability for smaller footprint and lower complexity - making LMH1208RTVT the optimal balance for dual-feed broadcast routing with local monitoring.
Availability
LMH1208RTVT is available at Aetrix Electronics and suitable for broadcast video routing, IP media gateway design, and professional video editing systems requiring stable component supply, SMPTE-compliant signal integrity, and long-term production continuity.
Supply support for LMH1208RTVT 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 high-speed interface solutions for industrial, automotive, and communications markets.
The LMH1208RTVT belongs to TI's high-speed video interface product line, engineered specifically for SMPTE-compliant UHD-SDI signal conditioning in broadcast infrastructure and professional AV equipment.
FAQ
What is the maximum supported data rate for LMH1208RTVT?
The LMH1208RTVT supports up to 11.88 Gbps, fully compliant with SMPTE ST-2082-1 for 4K/8K UHD-SDI applications. It also maintains backward compatibility with ST-2081-1 (6G), ST-424 (3G), ST-292 (HD), and ST-259 (SD) standards - verified in TI SNLS569C Rev C electrical characteristics tables.
Does LMH1208RTVT require external termination resistors on its 75-Ω outputs?
No. The LMH1208RTVT integrates precise 75-Ω single-ended termination at both SDI_OUT1± and SDI_OUT2± outputs, along with on-die return-loss compensation networks. External 75-Ω resistors are not required - only AC-coupling capacitors (4.7 µF) are needed per TI recommended layout.
How does the signal detect (SD_N) function operate on LMH1208RTVT?
The SD_N pin on LMH1208RTVT is an open-drain output that pulls low when a valid signal (≥20 mVp-p at 11.88 Gbps) is detected at IN0±. It can be reconfigured via register to serve as an interrupt (INT_N). TI SNLS569C specifies its threshold, timing, and pull-up requirements - confirming direct connection to MCU GPIO with external 4.7-kΩ pull-up to 3.3 V.
Can LMH1208RTVT drive both SDI_OUT1± and SDI_OUT2± simultaneously?
Yes. LMH1208RTVT supports concurrent operation of both 75-Ω cable drivers. When both are enabled, total power dissipation rises to 385 mW (typical at 11.88 Gbps), as specified in Table 6.5 of the TI datasheet - confirming full dual-output functionality without derating or thermal throttling under recommended conditions.
What package type and thermal characteristics apply to LMH1208RTVT?
LMH1208RTVT uses the RTV package: a 5.00 mm × 5.00 mm, 32-pin WQFN with exposed thermal pad (EP = VSS). Its junction-to-board thermal resistance is 6.5°C/W, and it requires a 3×3 via array under EP per TI layout guidelines - ensuring reliable operation at full 385-mW load within the –40°C to +85°C ambient range.
LMH1208RTVT 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
- Voltage - Supply:
- 2.375V ~ 2.625V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-WQFN (5x5)
LMH1208RTVT FAQ
1.How can I place an order for LMH1208RTVT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH1208RTVT 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 LMH1208RTVT reliable?
The price and inventory of LMH1208RTVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH1208RTVT is usually 5 days.
3.What payment methods are accepted for LMH1208RTVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH1208RTVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH1208RTVT?
LMH1208RTVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH1208RTVT 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 LMH1208RTVT?
For technical support, including LMH1208RTVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH1208RTVT requirements.
6.How does Aetrix verify that LMH1208RTVT is sourced from the original manufacturer or authorized distributors?
All LMH1208RTVT 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 LMH1208RTVT meets industry standards.
7.What is the process for return or replacement of LMH1208RTVT?
All LMH1208RTVT units undergo pre-shipment inspection (PSI). If there is an issue with LMH1208RTVT, 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 LMH1208RTVT part is unused and in its original packaging.
Return procedure for LMH1208RTVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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