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Texas Instruments LMH0044SQX
- Part No.:
- LMH0044SQX
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LMH0044SQX.pdf
- Description:
- IC INTERFACE SPECIALIZED 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
LMH0044SQX from Texas Instruments is an SMPTE 292M/259M adaptive cable equalizer IC for serial digital video interfaces, supporting data rates from 125 Mbps to 1.485 Gbps, equalizing up to 200 m of Belden 1694A coax at 1.485 Gbps, and operating from a single 3.3 V supply with 77 mA typical supply current.
For engineers reviewing the LMH0044SQX datasheet, LMH0044SQX pinout, LMH0044SQX application, or LMH0044SQX equivalent, this device serves as a drop-in replacement for Gennum GS1574A in SDI/HD-SDI receiver front-ends requiring adaptive equalization, DC restoration, carrier detect, and programmable output mute functionality.
Technical Context
The LMH0044SQX implements a multi-stage adaptive filter controlled by an external 1 µF AEC capacitor across AEC+ and AEC− pins, enabling real-time adjustment of gain and bandwidth based on cable loss characteristics. Its DC restoration block fully restores baseline for pathological SMPTE RP-178/RP-198 video signals without requiring external clamping.
It features dual differential inputs (SDI/SDI) and outputs (SDO/SDO), 50 Ω differential output impedance, and integrated carrier detect (CD) with programmable threshold via MUTEREF. The BYPASS pin disables both equalization and DC restoration, allowing transparent signal pass-through.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 1.485 Gbps - supports SMPTE 259M (SD-SDI), 292M (HD-SDI), and 344M (dual-link HD-SDI) standards. |
| Cable Equalization | Up to 200 m Belden 1694A at 1.485 Gbps - enables long-reach HD-SDI reception over standard 75 Ω coax without external amplification. |
| Supply Voltage | 3.3 V ±5% - single-rail operation simplifies power design and eliminates need for negative or split supplies. |
| Output Swing | 750 mVP–P differential into 50 Ω - meets SMPTE output amplitude requirements for downstream reclocking or distribution. |
| Input Return Loss | 15–20 dB (5 MHz–1.5 GHz) - ensures minimal signal reflection when used with properly matched PCB layout per AN-1372. |
| Power Consumption | 63–77 mA typical - decreases with increasing cable length, optimizing thermal performance in high-density video equipment. |
| Operating Temperature | 0°C to +85°C - qualified for commercial broadcast and professional AV equipment environments. |
Pinout & Package
LMH0044SQX is housed in a 16-pin WQFN package (RUM0016A) with 4 mm × 4 mm footprint, 0.65 mm pitch, and exposed thermal pad connected to VEE for enhanced thermal dissipation and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | VEE | Negative power supply (ground); all four pins must be low-inductance connected to system ground plane. |
| 2, 3 | SDI / SDI | Differential serial data input - accepts AC-coupled SDI signals; supports both single-ended and differential drive. |
| 5, 6 | AEC+ / AEC− | Loop filter terminals for adaptive equalization control; require 1 µF capacitor to set AEC loop dynamics. |
| 7 | BYPASS | Active-high disable of equalization and DC restoration - enables direct signal path for calibration or bypass mode. |
| 8 | MUTEREF | Reference voltage input for carrier detect threshold; floating = maximum equalization range before mute activation. |
| 10, 11 | SDO / SDO | Differential serial data output - internally terminated to 50 Ω, delivering 750 mVP–P swing into 50 Ω load. |
| 13, 16 | VCC | Positive supply (3.3 V); both pins must be decoupled with local 0.1 µF ceramic capacitors near package. |
| 14 | MUTE | Active-high output muting control; tied to CD for automatic mute during loss-of-signal conditions. |
| 15 | CD | Carrier detect open-drain output - high = no valid input signal detected; used with MUTE for fail-safe output blanking. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive equalization | Real-time compensation for dispersive loss in coaxial media up to 200 m at 1.485 Gbps, eliminating manual tuning. |
| Integrated DC restoration | Self-biasing circuitry restores baseline for pathological SMPTE video patterns without external components or timing constraints. |
| Programmable carrier detect | MUTEREF-adjustable threshold allows precise control of cable-length-dependent mute activation for robust link monitoring. |
| Footprint compatibility | Pin-to-pin and package-compatible with Gennum GS1574A, enabling drop-in replacement in existing SDI receiver designs. |
| Low-power operation | Supply current scales inversely with cable length (77 mA @ 0 m → 63 mA @ 200 m), reducing thermal load in compact enclosures. |
Applications
| HD-SDI Camera Interface | SDI Distribution Amplifier |
|---|---|
|
Use Scenario: Receiving uncompressed 1080p60 video from a broadcast camera over 150 m of Belden 1694A coaxial cable in a live production truck. IC Role / Device Role / Timing Role: Adaptive equalizer and DC restorer in the receiver front-end, recovering degraded eye diagrams while preserving SMPTE timing integrity. Use Value: Restores signal integrity to meet SMPTE 292M jitter and amplitude specifications, enabling reliable reclocking and frame synchronization. |
Use Scenario: Fan-out of a single HD-SDI source to eight monitors in a broadcast control room using passive coax routing. IC Role / Device Role / Timing Role: Input equalizer stage before re-driving and splitting, compensating for cumulative cable loss across multiple branches. Use Value: Enables clean signal distribution without cascaded degradation, maintaining eye opening > 60% at 1.485 Gbps after 100 m of total path length. |
| Medical Imaging Video Link | Industrial Machine Vision System |
|
Use Scenario: Transmitting real-time surgical endoscopy video from OR equipment to PACS display over 80 m of installed coax infrastructure. IC Role / Device Role / Timing Role: Cable equalizer and carrier-detect-enabled mute in diagnostic imaging receiver, ensuring zero-glitch black-screen behavior during cable disconnect. Use Value: Prevents display artifacts during intermittent connections via CD/MUTE interlock, meeting IEC 62304 safety-critical response requirements. |
Use Scenario: High-speed inspection camera interfacing with FPGA-based vision processor over 60 m of factory-floor coax cabling. IC Role / Device Role / Timing Role: Signal conditioner in machine vision acquisition chain, restoring edge fidelity for sub-pixel feature detection algorithms. Use Value: Reduces bit error rate below 1e−12 by improving eye height and jitter margin, directly increasing defect detection accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adaptive SDI equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GS1574A | Pin-compatible predecessor; identical 16-pin WQFN package and pinout, but lacks internal ESD rating documentation and updated AEC loop stability. | Legacy design reuse only; not recommended for new designs due to obsolete status and lack of TI's extended lifetime support. | Select LMH0044SQX for new designs requiring full TI warranty, RoHS compliance, and documented 8 kV HBM ESD protection. |
| LMH0344SQX | Successor device with extended 2.97 Gbps support (SMPTE 424M), higher power (110 mA), and improved jitter performance (0.15 UI). | Required for 3G-SDI systems; incompatible with LMH0044SQX PCB layout due to different AEC capacitor value (100 nF vs. 1 µF) and pin mapping. | Choose LMH0044SQX when targeting cost-sensitive HD-SDI (1.485 Gbps) applications where 3G-SDI capability is unnecessary. |
Compared with GS1574A, LMH0044SQX offers verified ESD robustness and TI lifecycle support; compared with LMH0344SQX, it delivers lower power and simpler AEC filtering for HD-SDI-only systems, avoiding overdesign and cost premium.
Availability
LMH0044SQX is available at Aetrix Electronics and suitable for broadcast video infrastructure, medical imaging equipment, and industrial machine vision systems requiring stable component supply, long-term manufacturability, and SMPTE-compliant signal integrity.
Supply support for LMH0044SQX 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, with decades of leadership in broadcast and professional video signal conditioning.
The LMH0044SQX belongs to TI's LMH high-speed interface product line, engineered specifically for SMPTE-compliant serial digital video equalization, DC restoration, and robust link monitoring in mission-critical AV infrastructure.
FAQ
What is the primary function of the LMH0044SQX in an SDI system?
The LMH0044SQX functions as an adaptive cable equalizer and DC restorer for SMPTE 259M/292M serial digital video interfaces. It compensates for high-frequency loss in coaxial cables up to 200 meters at 1.485 Gbps and restores baseline for pathological video signals. In every SDI receiver design, the LMH0044SQX ensures compliant eye diagrams and jitter performance required for reliable reclocking and decoding.
Does the LMH0044SQX support both SD-SDI and HD-SDI data rates?
Yes, the LMH0044SQX supports data rates from 125 Mbps to 1.485 Gbps, covering SMPTE 259M (270 Mbps SD-SDI), SMPTE 292M (1.485 Gbps HD-SDI), and SMPTE 344M (540 Mbps dual-link SD-SDI). Its adaptive architecture automatically adjusts to each rate without configuration. The LMH0044SQX maintains specified jitter (<0.3 UI) and return loss (>15 dB) across this full range, making it suitable for mixed-rate broadcast switchers.
How does the BYPASS pin affect LMH0044SQX operation?
When the BYPASS pin is driven high, the LMH0044SQX disables both its adaptive equalization filter and DC restoration circuit, passing the input signal directly to the outputs with minimal delay and distortion. This mode is used for system calibration, loopback testing, or integration with external equalizers. In BYPASS mode, the LMH0044SQX consumes reduced current and ignores AEC+, AEC−, MUTEREF, CD, and MUTE functions-only SDI/SDI and SDO/SDO remain active.
Can the LMH0044SQX replace the Gennum GS1574A without board changes?
Yes, the LMH0044SQX is footprint-compatible and pin-to-pin interchangeable with the Gennum GS1574A, sharing identical 16-pin WQFN (RUM) packaging, pin numbering, and basic functional mapping. No PCB layout changes are required. However, the LMH0044SQX uses a 1 µF AEC capacitor versus GS1574A's 470 nF, so capacitor value must be updated. All other external components-including 0.1 µF VCC decoupling and 1.0 µF input coupling-remain unchanged for the LMH0044SQX.
What is the role of the MUTEREF pin in LMH0044SQX operation?
The MUTEREF pin sets the carrier detect threshold voltage that determines when the LMH0044SQX asserts its CD output and, if CD is tied to MUTE, initiates output muting. Applying a voltage between 0.7 V and 1.3 V to MUTEREF scales the effective cable length before mute activation-higher voltage reduces allowable equalization distance. Leaving MUTEREF unconnected configures the LMH0044SQX for maximum equalization range (e.g., 200 m at 1.485 Gbps), which is the default setting for most HD-SDI installations.
LMH0044SQX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Data Transport
- Interface:
- Serial
- Voltage - Supply:
- 3.135V ~ 3.465V
- Supplier Device Package:
- 16-WQFN (4x4)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LMH0044SQX FAQ
1.How can I place an order for LMH0044SQX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0044SQX 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 LMH0044SQX reliable?
The price and inventory of LMH0044SQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0044SQX is usually 5 days.
3.What payment methods are accepted for LMH0044SQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0044SQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0044SQX?
LMH0044SQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0044SQX 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 LMH0044SQX?
For technical support, including LMH0044SQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0044SQX requirements.
6.How does Aetrix verify that LMH0044SQX is sourced from the original manufacturer or authorized distributors?
All LMH0044SQX 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 LMH0044SQX meets industry standards.
7.What is the process for return or replacement of LMH0044SQX?
All LMH0044SQX units undergo pre-shipment inspection (PSI). If there is an issue with LMH0044SQX, 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 LMH0044SQX part is unused and in its original packaging.
Return procedure for LMH0044SQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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