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Texas Instruments LMH0344GRX/NOPB
- Part No.:
- LMH0344GRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 25-TFBGA, CSPBGA
- Datasheet:
-
LMH0344GRX/NOPB.pdf
- Description:
- IC INTFACE SPECIALIZED 25CSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
LMH0344GRX/NOPB from Texas Instruments is a 3-Gbps HD/SD SDI adaptive cable equalizer IC designed for serial digital video signal recovery in broadcast and professional video systems. It equalizes up to 120 m of Belden 1694A coax at 2.97 Gbps, supports SMPTE ST 424/292/344/259 standards, delivers ≤0.3 UI output jitter, and operates from a single 3.3-V supply with 280-mW typical power consumption.
For engineers reviewing the LMH0344GRX/NOPB datasheet, LMH0344GRX/NOPB pinout, LMH0344GRX/NOPB application, or LMH0344GRX/NOPB equivalent, key selection criteria include adaptive equalization range (125 Mbps–2.97 Gbps), differential input/output interface, carrier detect/mute control logic, DC restoration capability, and WQFN-16 package compatibility with legacy TI SDI equalizers.
Technical Context
The LMH0344GRX/NOPB implements a multistage adaptive filter controlled by an external 1-µF AEC+–AEC− capacitor loop, enabling real-time compensation of dispersive loss in coaxial media. Its DC restoration block fully restores baseline for pathological video patterns per SMPTE RP 178/RP 198, while maintaining input common-mode voltage ≥1.9 V and supporting both single-ended and differential AC-coupled inputs.
Carrier detection (CD) and programmable mute (MUTE/MUTEREF) operate independently of bypass mode; CD asserts high when no valid signal is present, and MUTEREF voltage (0.6–1.3 V range) sets the threshold for automatic muting based on cable degradation level. Output drivers deliver 750-mVP–P differential swing into 100-Ω loads with 50-Ω internal termination and <15 ps rise/fall time mismatch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 2.97 Gbps - supports SD, HD, and 3G-SDI video formats across SMPTE ST 259/292/344/424 standards. |
| Max Equalization Distance | 120 m Belden 1694A @ 2.97 Gbps - enables long-haul coax routing without repeaters in broadcast infrastructure. |
| Output Jitter | ≤0.3 UI @ 2.97 Gbps - meets SMPTE RP 184 timing compliance for error-free video transmission. |
| Supply Voltage | 3.3 V ±4.5% - single-rail operation simplifies power design versus dual-supply alternatives. |
| Power Consumption | 280 mW typical - low thermal load allows dense PCB placement in multi-channel video routers. |
| Input Return Loss | ≥10 dB from 1.5–3.0 GHz - ensures impedance matching to 75-Ω coax, minimizing reflections per ST 424 requirements. |
| ESD Rating | HBM ±8 kV - robust handling for production and field service in broadcast equipment environments. |
Pinout & Package
The LMH0344GRX/NOPB is packaged in a 4.00 mm × 4.00 mm, 16-pin WQFN (RUM) with exposed die attach pad (DAP) connected to VEE. Pin functions are validated per TI SNLS233O datasheet Rev O (July 2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDI / SDI | Differential analog input | Accepts AC-coupled SDI data (true/complement); supports single-ended or differential drive per layout configuration. |
| SDO / SDO | Differential analog output | Delivers 750-mVP–P differential output with internal 50-Ω termination; requires no external load resistors. |
| AEC+ / AEC− | Analog loop filter terminals | Connect external 1-µF capacitor to set adaptive equalizer bandwidth and convergence speed. |
| BYPASS | Digital control input | LVCMOS high disables equalization and DC restoration; requires external pulldown if unused. |
| MUTE / CD / MUTEREF | Signal integrity control | MUTE forces output disable; CD indicates carrier absence; MUTEREF sets muting threshold voltage (0.6–1.3 V). |
| VCC / VEE / DAP | Power and ground | VCC = +3.3 V; VEE = ground; DAP must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive equalization | Real-time compensation of coaxial cable loss up to 120 m @ 2.97 Gbps using external AEC capacitor loop. |
| DC restoration | Self-biasing circuit fully restores baseline for pathological video patterns (RP 178/RP 198), preventing data-dependent offset drift. |
| Programmable muting | MUTEREF voltage adjusts carrier detect threshold, enabling precise control over maximum equalizable cable length before output mute. |
| Differential I/O interface | Internal 50-Ω output termination and 1.3-kΩ input resistance simplify PCB layout and ensure 75-Ω system impedance compliance. |
| Single-supply operation | 3.3-V rail eliminates need for negative supplies or level shifters, reducing BOM count and board space in multi-channel designs. |
Applications
| Broadcast Video Routing | HD/3G-SDI Camera Interface |
|---|---|
Use Scenario: Signal conditioning in 12×12 SDI video matrix switchers handling mixed SD/HD/3G-SDI sources. IC Role / Device Role / Timing Role: Adaptive equalizer restoring eye opening after 80 m of Belden 1694A cable run between router input cards and distribution amplifiers. Use Value: Enables reliable 2.97-Gbps signal recovery without manual gain tuning, reducing setup time and improving channel-to-channel consistency. | Use Scenario: Front-end equalization in broadcast-grade camera control units receiving uncompressed 10-bit 4:2:2 video over coax. IC Role / Device Role / Timing Role: Serial data equalizer compensating for high-frequency attenuation in camera-to-control-unit cabling, with DC restoration for sync pulse integrity. Use Value: Maintains SMPTE ST 424 eye mask compliance at receiver input, eliminating bit errors caused by intersymbol interference in long cable runs. |
| Medical Imaging Display Systems | Professional Video Production Recorders |
Use Scenario: Real-time video feed conditioning in surgical display systems requiring zero-latency HD-SDI transmission from endoscopic cameras. IC Role / Device Role / Timing Role: Cable equalizer recovering 1.485-Gbps HD-SDI signals from 100 m coax runs, with carrier detect disabling blank display outputs during cable disconnect. Use Value: Prevents display artifacts during hot-plug events via CD-triggered mute, ensuring clinical workflow continuity and patient safety compliance. | Use Scenario: Input stage in multi-channel 3G-SDI field recorders capturing simultaneous 4K/UHD feeds from multiple cameras. IC Role / Device Role / Timing Role: Adaptive equalizer enabling simultaneous support of ST 259 (270 Mbps), ST 292 (1.485 Gbps), and ST 424 (2.97 Gbps) inputs on shared PCB layout. Use Value: Eliminates need for separate equalizer variants per data rate, reducing inventory SKUs and simplifying firmware calibration routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SDI equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH0344RGTT | Same silicon, 3-mm × 3-mm 25-ball CS-BGA package - smaller footprint but higher assembly complexity and lower thermal conductivity (RθJA = 58.1°C/W vs. 40°C/W). | Preferred for ultra-compact portable video encoders where board area is constrained more than thermal budget. | Select LMH0344RGTT only when space savings outweigh thermal derating and rework challenges of fine-pitch BGA. |
| GS2974B | Discontinued Semtech part; identical functional spec per TI documentation, but lacks HBM ±8 kV ESD rating and has no CS-BGA option. | Legacy replacement in existing designs where LMH0344GRX/NOPB drop-in substitution is validated per TI's stated replacement guidance. | Use GS2974B only for repair of obsolete equipment; LMH0344GRX/NOPB is preferred for new designs due to enhanced ESD robustness and packaging flexibility. |
Compared with LMH0344RGTT, the LMH0344GRX/NOPB offers superior thermal performance and easier reworkability in WQFN format, while compared with GS2974B it provides higher ESD immunity and ongoing supply assurance - making it optimal for industrial broadcast hardware requiring long-term manufacturability and field reliability.
Availability
LMH0344GRX/NOPB is available at Aetrix Electronics and suitable for broadcast video routing, HD/3G-SDI camera interfaces, medical imaging displays, and professional video production recorders requiring stable component supply across extended product lifecycles.
Supply support for LMH0344GRX/NOPB 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 and embedded processing technologies, with broad expertise in high-speed signal conditioning and video interface solutions.
The LMH0344GRX/NOPB belongs to TI's SDI equalizer product line, engineered specifically for SMPTE-compliant serial digital video infrastructure where adaptive cable loss compensation, DC restoration, and carrier-aware muting are critical for broadcast-grade reliability.
FAQ
What data rates does the LMH0344GRX/NOPB support?
The LMH0344GRX/NOPB supports a continuous data rate range from 125 Mbps to 2.97 Gbps, covering SMPTE ST 259 (270 Mbps), ST 292 (1.485 Gbps), ST 344 (1.485 Gbps), and ST 424 (2.97 Gbps) standards. This wide range allows a single LMH0344GRX/NOPB design to handle SD, HD, and 3G-SDI video without hardware changes, verified per TI SNLS233O datasheet Section 6.6.
How does the LMH0344GRX/NOPB implement adaptive equalization?
The LMH0344GRX/NOPB uses a multistage adaptive filter whose gain and bandwidth are dynamically adjusted by an external 1-µF capacitor connected between AEC+ and AEC− pins. This loop continuously monitors input signal quality and optimizes equalization response in real time, enabling robust performance across varying cable lengths and types - a core function confirmed in the Functional Block Diagram and Section 7.3.1 of the LMH0344GRX/NOPB datasheet.
What is the purpose of the MUTEREF pin on the LMH0344GRX/NOPB?
The MUTEREF pin on the LMH0344GRX/NOPB sets the voltage threshold for carrier detect (CD) assertion and, when CD is tied to MUTE, determines the maximum cable length before automatic output muting. Applying 0.6–1.3 V to MUTEREF inversely controls equalization depth - lower voltages allow longer cable equalization before muting. Leaving MUTEREF unconnected or grounded enables maximum equalization, as specified in Section 7.3.2 of the LMH0344GRX/NOPB datasheet.
Does the LMH0344GRX/NOPB require external termination resistors?
No, the LMH0344GRX/NOPB does not require external termination resistors on its SDO/SDO outputs. It integrates 50-Ω internal pullups per output leg, delivering a 100-Ω differential output impedance matched to standard 75-Ω coaxial systems when used with appropriate AC-coupling and PCB trace design. This is explicitly stated in the Features section and confirmed in Section 7.3.5 of the LMH0344GRX/NOPB datasheet.
Can the LMH0344GRX/NOPB accept single-ended input signals?
Yes, the LMH0344GRX/NOPB accepts both differential and single-ended AC-coupled inputs, as documented in Section 7.3.4 and Section 8.1 of the LMH0344GRX/NOPB datasheet. For single-ended operation, one SDI pin is driven with the signal and the other is AC-coupled to ground; the device's internal architecture adapts to maintain proper common-mode rejection and equalization performance without external biasing components.
LMH0344GRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-TFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Data Transport
- Interface:
- Serial
- Voltage - Supply:
- 3.135V ~ 3.465V
- Supplier Device Package:
- 25-CSBGA (3x3)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LMH0344GRX/NOPB FAQ
1.How can I place an order for LMH0344GRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0344GRX/NOPB 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 LMH0344GRX/NOPB reliable?
The price and inventory of LMH0344GRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0344GRX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH0344GRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0344GRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0344GRX/NOPB?
LMH0344GRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0344GRX/NOPB 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 LMH0344GRX/NOPB?
For technical support, including LMH0344GRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0344GRX/NOPB requirements.
6.How does Aetrix verify that LMH0344GRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH0344GRX/NOPB 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 LMH0344GRX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH0344GRX/NOPB?
All LMH0344GRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH0344GRX/NOPB, 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 LMH0344GRX/NOPB part is unused and in its original packaging.
Return procedure for LMH0344GRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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