My Inquiry
My Account
Texas Instruments LMH0044SQ
- Part No.:
- LMH0044SQ
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LMH0044SQ.pdf
- Description:
- IC INTERFACE SPECIALIZED 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,634
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMH0044SQ 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, and operating from a single 3.3 V supply with 77 mA typical supply current.
For engineers reviewing the LMH0044SQ datasheet, LMH0044SQ pinout, LMH0044SQ application, or LMH0044SQ equivalent, this device serves as a drop-in replacement for GS1574A in SDI/HD-SDI receiver front-ends requiring adaptive equalization, DC restoration, carrier detect, and programmable output mute functionality.
Technical Context
The LMH0044SQ implements a multi-stage adaptive filter controlled by an external 1 µF AEC capacitor across AEC+ and AEC−, enabling real-time compensation of dispersive loss in coaxial media. Its DC restoration block handles pathological SMPTE RP-178/RP-198 video patterns without signal degradation.
It features differential input (SDI/SDI) and 50 Ω differential outputs (SDO/SDO), with independent carrier detect (CD) and manual mute (MUTE) pins tied via MUTEREF to set cable-length-dependent muting thresholds. Bypass mode disables both equalization and DC restoration.
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 without repeaters. |
| Supply Voltage | 3.3 V ±5% - single-rail operation simplifies power design in broadcast equipment. |
| Output Swing | 750 mVP–P differential into 50 Ω - meets SMPTE output amplitude requirements for downstream reclocking. |
| Input Return Loss | 15–20 dB (5 MHz–1.5 GHz) - ensures minimal signal reflection on PCB traces and connectors. |
| Power Consumption | 63–77 mA typical - decreases with increasing cable length, optimizing thermal performance in dense chassis. |
| Jitter Tolerance | ≤0.25 UI at 1.485 Gbps over 140 m Belden 1694A - maintains eye integrity for reliable CDR lock. |
Pinout & Package
LMH0044SQ is housed in a 16-pin WQFN package (RUM0016A) with 4 mm × 4 mm body, 0.65 mm pitch, and exposed thermal pad connected to VEE for thermal and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | VEE | Negative power supply (ground); all four pins must be low-impedance connected to system ground plane. |
| 2, 3 | SDI / SDI | Differential serial data input; accepts AC-coupled single-ended or differential signals per SMPTE standards. |
| 5, 6 | AEC+ / AEC− | Loop filter terminals for external 1 µF capacitor; sets adaptation speed and stability of equalizer gain control. |
| 7 | BYPASS | Active-high disable of equalization and DC restoration - used for test mode or legacy signal paths. |
| 8 | MUTEREF | Reference voltage input (0.7–1.3 V) setting CD threshold; unconnected = maximum equalization before mute. |
| 10, 11 | SDO / SDO | Differential serial data output; internally terminated to 50 Ω, delivering 750 mVP–P swing into 50 Ω loads. |
| 13, 16 | VCC | +3.3 V supply; decoupling capacitors required near each pin per layout guidelines. |
| 14 | MUTE | Active-high output mute control; ties to CD for automatic mute when no valid signal is detected. |
| 15 | CD | Carrier detect open-drain output; high = no input signal present; functional only when BYPASS = low. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Equalization | Real-time compensation of coaxial cable loss up to 200 m at 1.485 Gbps using AEC-controlled multi-stage filter. |
| DC Restoration | Self-biasing circuit restores baseline for pathological video patterns (e.g., SMPTE color bars), preventing baseline wander. |
| Programmable Mute Threshold | MUTEREF pin allows precise setting of cable-length-dependent muting point - critical for automated link health monitoring. |
| Footprint Compatibility | Pin-to-pin and footprint compatible with Gennum GS1574A - enables drop-in upgrade in existing SDI receiver designs. |
| Low-Jitter Output | ≤0.25 UI jitter at 1.485 Gbps over 140 m Belden 1694A - preserves eye opening for robust clock recovery in downstream devices. |
Applications
| HD-SDI Camera Backhaul | Studio Router Input Stage |
|---|---|
|
Use Scenario: Transmitting uncompressed 1080p60 video over 150 m Belden 1694A coax from camera head to production switcher. IC Role / Device Role / Timing Role: Adaptive equalizer restoring signal integrity at router input, enabling clean CDR lock and frame synchronization. Use Value: Eliminates need for active repeaters or fiber conversion, reducing latency and BOM cost while maintaining SMPTE 292M compliance. |
Use Scenario: Receiving multiple SDI feeds in broadcast routing matrix with automatic link failover based on carrier presence. IC Role / Device Role / Timing Role: Front-end equalizer with integrated CD and MUTE, providing deterministic mute assertion when input drops. Use Value: Enables zero-glitch source switching by muting downstream logic until valid signal is restored - critical for live airchain reliability. |
| Medical Imaging Video Capture | Test Equipment Signal Conditioning |
|
Use Scenario: Capturing high-fidelity surgical endoscopy video over 80 m coax in EMI-noisy OR environment. IC Role / Device Role / Timing Role: Equalizer compensating for frequency-dependent loss while rejecting common-mode noise via differential I/O. Use Value: Maintains >15 dB input return loss up to 1.5 GHz, ensuring minimal ghosting or timing jitter in diagnostic-grade video. |
Use Scenario: Calibrating SDI signal generators and analyzers with known cable-loss profiles in lab validation setups. IC Role / Device Role / Timing Role: Reference equalizer with BYPASS mode for golden-signal comparison and AEC tuning verification. Use Value: Allows repeatable characterization of jitter, rise time (100–220 ps), and overshoot (<5%) under defined cable conditions. |
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; lacks internal DC restoration bypass control and has higher 95 mA typical ICC. | Same SMPTE 292M/259M support but requires external DC restoration circuitry in some legacy designs. | Select GS1574A only for backward compatibility where LMH0044SQ's enhanced DC restoration is not required. |
| LMH0344 | Higher-speed variant (up to 2.97 Gbps); same WQFN-16 package but different AEC architecture and pin mapping. | Supports 3G-SDI (SMPTE 424M); not drop-in replaceable due to relocated AEC and MUTE pins. | Choose LMH0344 when upgrading to 3G-SDI infrastructure; LMH0044SQ remains optimal for cost-sensitive 1.5G-SDI deployments. |
Compared with GS1574A, LMH0044SQ reduces supply current by ~20% and integrates DC restoration, while LMH0344 extends bandwidth to 3G-SDI but requires PCB redesign - making LMH0044SQ the optimal balance of performance, compatibility, and power efficiency for 1.5G-SDI systems.
Availability
LMH0044SQ is available at Aetrix Electronics and suitable for broadcast infrastructure, medical imaging video capture, studio routing systems, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LMH0044SQ 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 LMH0044SQ belongs to TI's LMH high-speed interface product line, designed specifically for SMPTE-compliant serial digital video equalization, emphasizing low jitter, adaptive cable compensation, and seamless integration into HD-SDI receiver architectures.
FAQ
What is the primary function of the LMH0044SQ in an SDI signal chain?
The LMH0044SQ functions as an adaptive coaxial cable equalizer that restores high-frequency loss in SMPTE 259M/292M serial digital video signals. It dynamically adjusts its frequency response using an external AEC capacitor to compensate for cable lengths up to 200 m at 1.485 Gbps, ensuring clean signal recovery for downstream clock-data recovery circuits. The LMH0044SQ also integrates DC restoration and carrier detect to maintain signal integrity and enable automatic link monitoring.
Can the LMH0044SQ operate with single-ended inputs?
Yes, the LMH0044SQ accepts either differential or single-ended AC-coupled inputs on pins SDI and SDI. When driven single-ended, one input is terminated to VEE while the other receives the signal; the internal differential amplifier rejects common-mode noise. Transformer coupling is not supported, and input coupling capacitance must be 1.0 µF per TI's recommended operating conditions. This flexibility allows the LMH0044SQ to interface directly with legacy video sources lacking differential drivers.
How does the MUTEREF pin affect the LMH0044SQ's carrier detect behavior?
The MUTEREF pin sets the voltage threshold for the LMH0044SQ's carrier detect (CD) output. Applying a voltage between 0.7 V and 1.3 V inversely scales the cable length at which CD asserts (high) and triggers output mute via MUTE. Higher MUTEREF voltages reduce allowable equalization range before muting; leaving MUTEREF unconnected enables maximum equalization. This feature allows system designers to tune link reliability thresholds without firmware changes - a key capability in the LMH0044SQ for broadcast-grade fail-safe operation.
Is the LMH0044SQ pin-compatible with the Gennum GS1574A?
Yes, the LMH0044SQ is footprint and pin-compatible with the Gennum GS1574A, enabling direct replacement in existing designs. Both use identical 16-pin WQFN (RUM) packages with matching pin assignments for VCC, VEE, SDI/SDI, SDO/SDO, CD, MUTE, BYPASS, and AEC+/AEC−. TI explicitly states this compatibility in the "Replacing the Gennum GS1574A" section of the LMH0044SQ datasheet, confirming that no PCB layout changes are required when upgrading to the LMH0044SQ for improved power efficiency and integrated DC restoration.
What thermal considerations apply to the LMH0044SQ's exposed thermal pad?
The LMH0044SQ's exposed thermal pad (DAP) is electrically connected to VEE and must be soldered to a low-thermal-resistance ground plane on the PCB. TI specifies θJA = 43°C/W and θJC = 9°C/W for the WQFN package, indicating that proper thermal pad connection is essential to maintain junction temperature below 150°C under worst-case 77 mA operation. Layout guidelines recommend ≥78% solder paste coverage and optional thermal vias filled/plugged to minimize thermal resistance - critical for sustained 1.485 Gbps operation in compact broadcast enclosures.
LMH0044SQ 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
LMH0044SQ FAQ
1.How can I place an order for LMH0044SQ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0044SQ 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 LMH0044SQ reliable?
The price and inventory of LMH0044SQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0044SQ is usually 5 days.
3.What payment methods are accepted for LMH0044SQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0044SQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0044SQ?
LMH0044SQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0044SQ 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 LMH0044SQ?
For technical support, including LMH0044SQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0044SQ requirements.
6.How does Aetrix verify that LMH0044SQ is sourced from the original manufacturer or authorized distributors?
All LMH0044SQ 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 LMH0044SQ meets industry standards.
7.What is the process for return or replacement of LMH0044SQ?
All LMH0044SQ units undergo pre-shipment inspection (PSI). If there is an issue with LMH0044SQ, 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 LMH0044SQ part is unused and in its original packaging.
Return procedure for LMH0044SQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMH0044SQ Tags
-
NVT4857UKAZ
NXP Semiconductors
-
TCA8418RTWR
Texas Instruments
-
PCA9546APWR
Texas Instruments
-
MD0100N8-G
Microchip Technology
-
PCA9548APW,118
NXP Semiconductors
-
PCA9540BDP,118
NXP Semiconductors
-
PCA9548APWR
Texas Instruments
-
PCA9546APW,118
NXP Semiconductors
-
PTN3360DBS,518
NXP Semiconductors
-
PCA9546ABS,118
NXP Semiconductors
-
PCA9518PWR
Texas Instruments
-
PCA9545APW,118
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
