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Texas Instruments LMH0303SQX/NOPB
- Part No.:
- LMH0303SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LMH0303SQX/NOPB.pdf
- Description:
- IC VIDEO DRIVER 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,638
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Product details
Overview
LMH0303SQX/NOPB from Texas Instruments is a 3-Gbps HD/SD SDI cable driver IC designed for serial digital video transmission in broadcast and professional AV systems. It supports ST 424 (3G), ST 292 (HD), and ST 259 (SD) standards, delivers 75-Ω single-ended outputs with 800 mVP–P swing into 75-Ω coaxial cable, and features SMBus-configurable slew rate, output amplitude adjustment (±10% in 5-mV steps), and integrated cable detect/loss-of-signal diagnostics.
For engineers reviewing the LMH0303SQX/NOPB datasheet, LMH0303SQX/NOPB pinout, LMH0303SQX/NOPB application, or LMH0303SQX/NOPB equivalent, key selection considerations include its 16-pin WQFN package, dual-mode SD/HD slew control via pin or SMBus, 4-mW power-save mode activation on fault detection, and compatibility with Belden 1694A/8281 coaxial cabling in routing, distribution, and switching infrastructure.
Technical Context
The LMH0303SQX/NOPB implements a current-mode output stage with selectable edge rates: SD/HD pin low enables fast rise/fall times (400–800 ps) for ST 292/424 compliance; high enables slower edges (90–130 ps) for ST 259. Its loss-of-signal detector rejects noise and self-oscillation while maintaining jitter performance ≤20 psP–P at 2.97 Gbps.
Cable detect operates by monitoring SDO/SDO peak-to-peak voltage - un-terminated output reflects 100%, doubling amplitude to ~1600 mVP–P, triggering FAULT assertion. SMBus interface (default 7-bit address 0x17) provides register-level control of termination thresholds, amplitude (register 0x04, AMP field), power-down state, and fault masking - all accessible without altering pin-strapped configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 2.97 Gbps - supports full 3G-SDI (ST 424), HD-SDI (ST 292), and SD-SDI (ST 259) video streams without retiming. |
| Output Swing | 720–880 mVP–P into 75-Ω load - adjustable ±10% in 5-mV steps via SMBus register 0x04 for precise signal integrity tuning. |
| Slew Rate Control | Pin-selectable: SD/HD = L → 400–800 ps (HD/3G); SD/HD = H → 90–130 ps (SD) - ensures compliance with SMPTE eye diagram masks per standard. |
| Power Consumption | 155 mW typical in HD mode; 4 mW in deep power-save mode - activated automatically on LOS or termination fault via SMBus or ENABLE pin. |
| Input Impedance | 100-Ω differential - accepts both differential SDI inputs and single-ended with proper termination, simplifying front-end design. |
| Jitter Performance | ≤20 psP–P additive output jitter at 2.97 Gbps - preserves timing margin in multi-hop video distribution chains. |
| Supply Voltage | 3.13–3.46 V (nominal 3.3 V) - single-supply operation reduces board complexity versus dual-rail alternatives. |
Pinout & Package
LMH0303SQX/NOPB is housed in a 4.00 mm × 4.00 mm 16-pin WQFN package with exposed thermal pad (EP) requiring connection to ground plane via via array. The package supports high-speed signal integrity and efficient thermal dissipation (RθJA = 40.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (SDI, SDI) | Differential data input | Accepts 100-Ω differential SDI signal; unused input must be terminated for single-ended use. |
| 6 (ENABLE) | Output driver enable | LVCMOS input with internal pullup; low disables SDO/SDO output stage, reducing power to 4 mW. |
| 10 (SD/HD) | Slew rate select | LVCMOS input with internal pulldown; selects ST 259 (H) or ST 292/424 (L) edge rates - also configurable via SMBus register 0x02. |
| 7, 8 (SDA, SCL) | SMBus interface | Open-drain bidirectional data/clock pins requiring external pullups; default 7-bit address 0x17 supports daisy-chained multi-device configuration. |
| 13 (FAULT) | Open-drain fault flag | Asserts low on LOS or termination fault; supports wire-OR with multiple drivers for centralized system monitoring. |
| 11, 12 (SDO, SDO) | Differential data output | 75-Ω single-ended outputs driving coaxial cable; amplitude and slew rate fully configurable via SMBus or pins. |
Key Features
| Feature | Design Value |
|---|---|
| Cable detect with reflection sensing | Identifies un-terminated outputs by detecting doubled SDO amplitude (~1600 mVP–P), enabling automatic fail-safe response without external circuitry. |
| Loss-of-signal detection with noise immunity | Rejects coupled noise and self-oscillation while maintaining <20 psP–P jitter - ensures reliable fault signaling in electrically noisy broadcast environments. |
| SMBus-adjustable output amplitude | Registers 0x04 (AMP) and 0x05 allow fine-tuning of SDO swing in 5-mV increments across ±10%, optimizing signal level for specific cable lengths and receiver sensitivity. |
| Configurable fault reporting | Register 0x02 (MASK) and 0x03 (DIRECTION) let designers selectively mask or invert LOS/termination fault conditions before they assert FAULT, preventing false alarms in dynamic systems. |
| Deep power-save mode | Reduces consumption to 4 mW when ENABLE is deasserted or triggered by LOS/termination fault - extends uptime in thermally constrained enclosures. |
Applications
| Video Routing Switcher | Distribution Amplifier |
|---|---|
Use Scenario: A broadcast facility uses modular SDI routers to switch between 3G-SDI camera feeds, graphics generators, and recorders in real time. IC Role / Device Role / Timing Role: LMH0303SQX/NOPB acts as output cable driver on each router output port, conditioning signals for transmission over 100+ meter coaxial runs to downstream devices. Use Value: Its 2.97 Gbps capability and low additive jitter preserve eye opening across long cables, while cable detect prevents silent failures when BNC connectors are unplugged mid-broadcast. | Use Scenario: A live production truck distributes one master 3G-SDI program feed to 16 monitors, recorders, and streaming encoders simultaneously. IC Role / Device Role / Timing Role: LMH0303SQX/NOPB serves as channelized output driver in a 1:16 distribution amplifier, ensuring identical signal integrity across all outputs. Use Value: SMBus-controlled amplitude matching (±5 mV precision) eliminates inter-channel level variation, and FAULT pin wire-ORing allows centralized detection of any failed output channel. |
| HD/SD-SDI Converter | Field Production Encoder |
Use Scenario: A portable converter box accepts HD-SDI input and outputs SD-SDI for legacy equipment, requiring format-aware signal conditioning. IC Role / Device Role / Timing Role: LMH0303SQX/NOPB drives the SD-SDI output path, with SD/HD pin set high to enforce ST 259-compliant slew rates and eye shape. Use Value: Pin-selectable edge control eliminates need for separate SD/HD driver variants, reducing BOM count and firmware complexity in multi-standard designs. | Use Scenario: A battery-powered field encoder captures 1080p60 video and transmits over fiber using SDI-to-fiber conversion, requiring low-power, robust physical layer drivers. IC Role / Device Role / Timing Role: LMH0303SQX/NOPB drives the SDI output to the fiber transmitter, entering 4-mW power-save mode when no active source is detected. Use Value: Automatic transition to ultra-low-power state extends battery life during standby without sacrificing instant-on readiness when camera signal resumes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SDI cable driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH0302SQX/NOPB | Footprint-compatible 16-pin WQFN but lacks SMBus interface, cable detect, and LOS functionality - fixed 800 mVP–P output, no amplitude/slew adjustment. | Suitable only for static, non-diagnostic SDI links where cost minimization outweighs system intelligence needs. | Select LMH0302SQX/NOPB only if SMBus configuration, fault reporting, and power-save mode are unnecessary and board layout reuse is critical. |
| GS2971-IBE3 | Pin-incompatible 24-pin QFN; adds integrated reclocking, equalization, and CDR functionality - higher power (220 mW), supports longer cable reach (>150 m). | Required for degraded-signal environments (e.g., long-reach fiber extenders or damaged coax) where reconditioning is needed beyond simple driving. | Choose GS2971-IBE3 when input signal integrity is marginal and reclocking is mandatory; LMH0303SQX/NOPB remains optimal for clean-source, short-to-medium-haul driving. |
Compared with LMH0302SQX/NOPB, LMH0303SQX/NOPB adds diagnostic intelligence and configurability at modest cost premium; versus GS2971-IBE3, it offers lower power, smaller footprint, and simpler integration where reclocking is not required - making LMH0303SQX/NOPB the balanced choice for intelligent, space-constrained SDI output stages.
Availability
LMH0303SQX/NOPB is available at Aetrix Electronics and suitable for broadcast video routing, professional distribution amplifiers, and field production encoders requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LMH0303SQX/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, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The LMH0303SQX/NOPB belongs to TI's high-speed interface product line, engineered specifically for professional video infrastructure - emphasizing signal fidelity, diagnostic capability, and robustness in mission-critical broadcast environments.
FAQ
What video standards does the LMH0303SQX/NOPB support?
The LMH0303SQX/NOPB supports ST 424 (3G-SDI), ST 292 (HD-SDI), and ST 259 (SD-SDI) serial digital interface standards. It operates at data rates up to 2.97 Gbps for 3G-SDI, 1.485 Gbps for HD-SDI, and 270 Mbps for SD-SDI. The device also supports DVB-ASI at 270 Mbps. Its dual-mode slew rate control ensures compliance with the respective eye diagram requirements of each standard.
How does cable detect work on the LMH0303SQX/NOPB?
Cable detect on the LMH0303SQX/NOPB operates by monitoring the peak-to-peak voltage on SDO/SDO outputs. With proper 75-Ω termination, output amplitude is ~800 mVP–P; an open or unterminated output reflects 100% of the signal, doubling amplitude to ~1600 mVP–P. The LMH0303SQX/NOPB senses this condition and asserts the FAULT pin low. Detection requires the driver to be enabled and powered for ≥4 ms.
Can the LMH0303SQX/NOPB operate without an SMBus controller?
Yes, the LMH0303SQX/NOPB functions fully without SMBus: SD/HD and ENABLE pins provide basic slew rate and power control, while RREF resistor sets nominal output amplitude. SMBus is optional for advanced features - amplitude fine-tuning, fault masking, termination threshold adjustment, and multi-device addressing - but not required for core cable driving operation.
What is the purpose of the RREF pin on the LMH0303SQX/NOPB?
The RREF pin on the LMH0303SQX/NOPB sets the nominal output voltage swing by connecting a 750-Ω resistor to VCC. This resistor establishes the bias current for the current-mode output stage, yielding a typical 800 mVP–P swing into 75-Ω. Placement near the pin and removal of underlying copper minimize parasitic capacitance, ensuring stable amplitude and jitter performance per the LMH0303SQX/NOPB datasheet recommendations.
Does the LMH0303SQX/NOPB support daisy-chained SMBus configuration?
Yes, the LMH0303SQX/NOPB supports daisy-chained SMBus configuration using the RSTI/RSTO pins. By cascading RSTO of one device to RSTI of the next, a host can sequentially assign unique SMBus addresses (e.g., 0x2C, 0x2D) to multiple LMH0303SQX/NOPB units sharing SDA/SCL lines. This enables centralized control of up to 128 devices on a single two-wire bus, as specified in the LMH0303SQX/NOPB register map and functional description.
LMH0303SQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Driver
- Applications:
- Professional Video
- Standards:
- DVB-ASI, SMPTE
- Control Interface:
- Serial
- Voltage - Supply:
- 3.13V ~ 3.46V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-WQFN (4x4)
LMH0303SQX/NOPB FAQ
1.How can I place an order for LMH0303SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0303SQX/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 LMH0303SQX/NOPB reliable?
The price and inventory of LMH0303SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0303SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH0303SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0303SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0303SQX/NOPB?
LMH0303SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0303SQX/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 LMH0303SQX/NOPB?
For technical support, including LMH0303SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0303SQX/NOPB requirements.
6.How does Aetrix verify that LMH0303SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH0303SQX/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 LMH0303SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH0303SQX/NOPB?
All LMH0303SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH0303SQX/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 LMH0303SQX/NOPB part is unused and in its original packaging.
Return procedure for LMH0303SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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