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Texas Instruments LMH0044SQE
- Part No.:
- LMH0044SQE
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LMH0044SQE.pdf
- Description:
- IC INTERFACE SPECIALIZED 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
LMH0044SQE from Texas Instruments is an SMPTE 292M/259M adaptive coaxial 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 at 1.485 Gbps, featuring differential input/output, 3.3 V single-supply operation, and integrated DC restoration - deployed in broadcast-grade SDI receivers and camera back-end signal conditioning.
For engineers reviewing the LMH0044SQE datasheet, LMH0044SQE pinout, LMH0044SQE application, or LMH0044SQE equivalent, key selection criteria include SMPTE compliance level, adaptive equalization range, carrier detect/mute control behavior, power consumption vs. cable length, and WQFN-16 thermal performance under continuous HD/3G-SDI operation.
Technical Context
The LMH0044SQE implements a multi-stage adaptive filter with automatic gain and bandwidth adjustment driven by an external 1 µF AEC loop capacitor across AEC+ and AEC− pins; its DC restoration block fully restores baseline for pathological SMPTE RP-178/RP-198 video patterns without requiring external clamping.
It operates in either differential or AC-coupled single-ended input mode, delivers 50 Ω differential outputs with 750 mVP–P, and integrates carrier detect (CD) and programmable mute (MUTE/MUTEREF) logic that enables automatic output muting when signal degradation exceeds a voltage-defined threshold - all within a 16-pin WQFN package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 1.485 Gbps - supports SMPTE 259M (270 Mbps), 292M (1.485 Gbps), and 344M (2.97 Gbps) compliant signals. |
| Equalization Capacity | Up to 200 m Belden 1694A at 1.485 Gbps - enables long-haul HD-SDI transmission over standard 75 Ω coax without repeaters. |
| Input Configuration | Differential or single-ended AC-coupled - accommodates transformerless interface designs with 1.0 µF coupling capacitors. |
| Output Drive | 50 Ω differential, 750 mVP–P - directly drives 75 Ω coaxial lines with minimal external components. |
| Supply & Power | Single 3.3 V ±5%, 63–77 mA typical ICC - current scales inversely with cable length, dropping as equalization demand increases. |
| Operating Temperature | 0°C to +85°C - qualified for broadcast equipment enclosures and industrial video processing systems. |
| Jitter Performance | ≤0.25 UI at 1.485 Gbps over 200 m Belden 1694A - maintains eye integrity for reliable clock recovery downstream. |
Pinout & Package
LMH0044SQE uses a 16-pin WQFN package (RUM0016A) with 4 mm × 4 mm body, 0.8 mm max height, and exposed thermal pad connected to VEE for thermal and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | VEE | Negative supply (ground); four dedicated ground pins minimize ground bounce in high-speed serial operation. |
| 2, 3 | SDI / SDI | Differential serial data input - accepts AC-coupled SMPTE-compliant signals; internal 1.3 kΩ input resistance and 1 pF capacitance. |
| 5, 6 | AEC+ / AEC− | External loop filter connections for adaptive equalization control; requires 1 µF capacitor to set AEC response time. |
| 7 | BYPASS | Active-high disable of equalization and DC restoration - used for test mode or low-data-rate bypass paths. |
| 8 | MUTEREF | Programmable reference voltage (0.7–1.3 V) setting carrier detect threshold and maximum equalizable cable length. |
| 10, 11 | SDO / SDO | Differential serial data output - 50 Ω internally terminated, 750 mVP–P, rise/fall time 100–220 ps. |
| 13, 16 | VCC | +3.3 V positive supply; dual VCC pins reduce supply impedance and improve PSRR at high frequencies. |
| 14 | MUTE | Active-high output mute control - forces SDO/SDO to high-impedance when tied to VCC; disabled in BYPASS mode. |
| 15 | CD | Carrier detect open-drain output - high when no valid signal present; may be tied to MUTE for auto-muting. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Equalization | Self-tuning multi-stage filter adjusts gain/bandwidth in real time using AEC+ and AEC− feedback loop - eliminates manual tuning for varying cable lengths. |
| DC Restoration | Integrated self-biasing circuit fully restores baseline for pathological video patterns (e.g., SMPTE color bars), ensuring robust clock recovery downstream. |
| Programmable Mute Threshold | MUTEREF pin accepts 0.7–1.3 V to define cable-length-dependent muting point - enables precise fail-safe behavior in mission-critical video links. |
| Carrier Detect Integration | CD output provides open-drain status flag for signal presence; ties directly to MUTE for automatic output blanking during loss-of-signal events. |
| Footprint Compatibility | Pin-to-pin compatible with Gennum GS1574A - allows drop-in replacement in existing SDI receiver designs without PCB revision. |
Applications
| Camera Interface Module | Studio Router Input Stage |
|---|---|
Use Scenario: High-definition broadcast camera head connects via coaxial cable to base station over distances up to 200 m. IC Role / Device Role / Timing Role: Adaptive equalizer restoring signal integrity at receiver front-end before clock/data recovery. Use Value: Maintains <0.25 UI jitter at 1.485 Gbps, enabling reliable 1080p60 video transport without repeaters or manual gain adjustment. | Use Scenario: Central video routing switcher accepts multiple SDI inputs from cameras, recorders, and graphics engines. IC Role / Device Role / Timing Role: Signal conditioner normalizing amplitude and baseline across heterogeneous source cables and lengths. Use Value: Enables consistent eye opening across 16+ inputs with automatic adaptation - reduces per-channel calibration effort and improves system uptime. |
| Medical Imaging Endoscope | Outside Broadcast Vehicle |
Use Scenario: Rigid endoscope transmits uncompressed HD video over coiled coax inside surgical cart. IC Role / Device Role / Timing Role: Cable equalizer compensating for variable attenuation and dispersion in tightly wound cabling. Use Value: Supports 270 Mbps DVB-ASI and SMPTE 259M modes with ≤0.2 UI jitter - ensures diagnostic image fidelity and zero frame loss. | Use Scenario: Mobile OB truck receives feeds from remote cameras via long coax runs subject to temperature drift and connector wear. IC Role / Device Role / Timing Role: Adaptive receiver front-end maintaining signal integrity despite aging infrastructure and environmental stress. Use Value: Carrier detect + programmable mute prevents spurious output during intermittent signal loss - avoids black screen or noise bursts on air. |
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 pinout and function but lacks updated ESD rating (250 V MM vs. LMH0044SQE's 250 V MM and 8 kV HBM). | Legacy design reuse only; no support for newer SMPTE 344M or extended 1.485 Gbps jitter specs. | Select GS1574A only for cost-sensitive legacy production where TI's enhanced ESD robustness is not required. |
| LMH0046SQE | Successor with extended 2.97 Gbps support (SMPTE 424M), higher power (95 mA), and improved jitter (<0.15 UI at 2.97 Gbps). | Required for UHD/4K-SDI systems; not backward-compatible in BYPASS or MUTE timing behavior. | Choose LMH0046SQE when upgrading to 3G-SDI or future-proofing for 4K workflows - LMH0044SQE remains optimal for HD-SDI cost/performance balance. |
Compared with GS1574A, LMH0044SQE adds 8 kV HBM ESD protection and tighter jitter spec compliance; versus LMH0046SQE, it offers lower power (77 mA vs. 95 mA) and proven stability in mature HD-SDI infrastructure - making LMH0044SQE the preferred choice for cost-sensitive, field-deployed HD video equipment.
Availability
LMH0044SQE is available at Aetrix Electronics and suitable for broadcast video infrastructure, medical imaging systems, and outside broadcast vehicles requiring stable component supply, long-lifecycle assurance, and SMPTE-compliant signal integrity.
Supply support for LMH0044SQE 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 broad industrial and automotive portfolio coverage.
The LMH0044SQE belongs to TI's high-speed interface product line, engineered specifically for SMPTE-compliant serial digital video equalization in broadcast, medical, and professional AV systems - emphasizing signal fidelity, adaptive responsiveness, and field-reliability.
FAQ
What is the maximum cable length LMH0044SQE can equalize at 1.485 Gbps?
The LMH0044SQE equalizes up to 200 meters of Belden 1694A coaxial cable at 1.485 Gbps while maintaining ≤0.25 UI jitter. This capability is validated per SMPTE 292M and confirmed in TI's SNLS216E datasheet Figure 2 and AC Electrical Characteristics table. Performance depends on cable quality and termination; actual reach may vary with Belden 8281 or other 75 Ω media.
Does LMH0044SQE support both SMPTE 259M and SMPTE 292M standards?
Yes, LMH0044SQE is explicitly designed for SMPTE 259M (270 Mbps), SMPTE 292M (1.485 Gbps), and SMPTE 344M (2.97 Gbps) compliance. Its data rate range of 125 Mbps to 1.485 Gbps covers all standard-definition and high-definition serial digital interface requirements, including DVB-ASI at 270 Mbps as stated in the Features section of the LMH0044SQE datasheet.
How does the MUTEREF pin affect LMH0044SQE operation?
The MUTEREF pin sets the voltage threshold for carrier detect (CD) assertion and thus determines the maximum cable length before automatic output muting. Applying 0.7–1.3 V to MUTEREF inversely scales equalization range - higher voltage reduces allowable cable length. Leaving MUTEREF unconnected enables maximum equalization before muting, as documented in the LMH0044SQE device operation section and Table 1 pin description.
Is LMH0044SQE pin-compatible with the Gennum GS1574A?
Yes, LMH0044SQE is footprint-compatible with the Gennum GS1574A, as confirmed in the "Replacing the Gennum GS1574A" section of the LMH0044SQE datasheet. Both use identical 16-pin WQFN (RUM) packages and share matching pin functions, enabling drop-in replacement in existing designs - though LMH0044SQE adds improved ESD robustness and updated jitter specifications.
What is the recommended supply decoupling for LMH0044SQE?
TI recommends 1.0 µF AC coupling capacitors on SDI/SDI inputs and a 1.0 µF capacitor between AEC+ and AEC− for loop filter stability. For power supply, place 100 nF ceramic capacitors close to each VCC pin (pins 13 and 16) and connect the exposed thermal pad to VEE. These values are specified in the Recommended Operating Conditions table and PCB Layout Recommendations section of the LMH0044SQE datasheet.
LMH0044SQE 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
LMH0044SQE FAQ
1.How can I place an order for LMH0044SQE through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0044SQE 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 LMH0044SQE reliable?
The price and inventory of LMH0044SQE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0044SQE is usually 5 days.
3.What payment methods are accepted for LMH0044SQE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0044SQE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0044SQE?
LMH0044SQE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0044SQE 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 LMH0044SQE?
For technical support, including LMH0044SQE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0044SQE requirements.
6.How does Aetrix verify that LMH0044SQE is sourced from the original manufacturer or authorized distributors?
All LMH0044SQE 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 LMH0044SQE meets industry standards.
7.What is the process for return or replacement of LMH0044SQE?
All LMH0044SQE units undergo pre-shipment inspection (PSI). If there is an issue with LMH0044SQE, 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 LMH0044SQE part is unused and in its original packaging.
Return procedure for LMH0044SQE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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