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Texas Instruments LMH0394SQX/NOPB
- Part No.:
- LMH0394SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LMH0394SQX/NOPB.pdf
- Description:
- IC INTERFACE SPECIALIZED 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
LMH0394SQX/NOPB from Texas Instruments is a 3G HD/SD SDI adaptive cable equalizer IC designed for serial digital video signal recovery in broadcast infrastructure. It supports ST 424 (2.97 Gbps), ST 292 (1.485 Gbps), and ST 259 (270 Mbps) standards, delivers 115 mW normal-operation power consumption, enables up to 200 m Belden 1694A cable reach at 2.97 Gbps, and features programmable LVDS output swing (400–800 mVP-P) and de-emphasis for FR4 trace compensation.
For engineers reviewing the LMH0394SQX/NOPB datasheet, LMH0394SQX/NOPB pinout, LMH0394SQX/NOPB application, or LMH0394SQX/NOPB equivalent, key selection criteria include SMPTE compliance across HD/SD rates, ultra-low-power adaptive equalization, SPI-configurable output parameters, auto-sleep mode for dynamic power management, and footprint compatibility with legacy TI SDI equalizers including LMH0384 and LMH0344.
Technical Context
The LMH0394SQX/NOPB implements a multi-stage adaptive filter with active sensing circuitry that dynamically adjusts gain and bandwidth based on input signal launch amplitude and cable loss characteristics. Its DC restoration block fully restores pathological video patterns per ST RP 178/RP 198, ensuring robust handling of SD/HD serial digital video.
It operates in two mutually exclusive modes: pin-controlled mode (SPI_EN = GND) for drop-in replacement of legacy equalizers, and SPI mode (SPI_EN = VCC) enabling daisy-chained configuration, register-level control of output common-mode voltage (0.8–1.2 V), differential swing, de-emphasis, and cable-length indication - all while maintaining identical 16-pin WQFN footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 2.97 Gbps - supports full SMPTE ST 259/292/344/424 and DVB-ASI standards without reconfiguration. |
| Cable Reach (Belden 1694A) | 200 m at 2.97 Gbps - enables long-haul HD-SDI routing in broadcast switchers and distribution amplifiers. |
| Power Consumption | 115 mW (normal), 17 mW (auto-sleep) - reduces thermal load and system power budget in dense video processing chassis. |
| Output Interface | Internally terminated 100-Ω LVDS with programmable swing (400–800 mVP-P) and common-mode voltage (0.8–1.2 V) - ensures interoperability with diverse reclockers and FPGAs. |
| De-Emphasis Support | Programmable to compensate for up to 40″ of FR4 PCB trace loss - maintains signal integrity between equalizer and downstream receiver on multilayer boards. |
| Supply Voltage | Single 2.5 V ±5% - simplifies power delivery architecture versus dual-supply alternatives. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and broadcast equipment operating in uncontrolled environments. |
Pinout & Package
Package: 16-pin WQFN (4.00 mm × 4.00 mm), exposed thermal pad (DAP) connected to VEE (ground). RoHS-compliant, lead-free (NOPB suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, DAP | VEE / Ground | Negative supply reference and thermal path - all must be connected to low-impedance ground plane for EMI suppression and thermal stability. |
| 2, 3 | SDI / Analog Input | Differential true/complement SDI input - AC-coupled; unused input requires 75 Ω termination to match coaxial line impedance. |
| 4 | SPI_EN / LVCMOS Control | Selects pin mode (GND) or SPI mode (VCC); internal pulldown ensures safe default to pin mode at power-up. |
| 5, 6 | AEC+, AEC− / Analog Filter | External 1 µF loop filter connections for adaptive equalizer control - optional but recommended for optimal convergence stability. |
| 7 | BYPASS / LVCMOS Input | Disables equalization when high - used for diagnostic pass-through or bypassing during system calibration. |
| 8 | MUTEREF / Analog Reference | Sets carrier detect threshold voltage - floating (1.3 V typical) or externally biased to define maximum equalized cable length before mute activation. |
| 10, 11 | SDO, SDO / LVDS Output | Differential LVDS outputs with internal 100 Ω termination - DC-coupled to compatible receivers; supports programmable swing and de-emphasis via SPI. |
| 12 | AUTO SLEEP / LVCMOS Input | Enables deep power-down (<17 mW) when no input signal detected - precedence over MUTE/BYPASS; wake-up latency <5 ms. |
| 13, 16 | VCC / Power | +2.5 V supply pins - require local 100 nF + 10 µF decoupling per pin to suppress high-frequency noise from LVDS switching. |
| 14 | MUTE / LVCMOS Input | Forces outputs to logic-1 state when high - used for controlled blanking during source transitions or fault conditions. |
| 15 | CD / LVCMOS Output | Carrier detect status - low = valid SDI signal present; high = no signal or below MUTEREF threshold; drives MUTE when tied together. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Equalization with Active Sensing | Real-time adjustment of filter coefficients based on input launch amplitude and spectral content - maintains eye opening across varying cable lengths and data rates without manual tuning. |
| DC Restoration for Pathological Patterns | Self-biasing circuitry compliant with ST RP 178 (SD) and RP 198 (HD) - prevents baseline wander on long-run video sequences like color bars or static scenes. |
| Programmable Output De-Emphasis | Compensates for high-frequency loss in PCB traces up to 40″ - preserves rise/fall time (90–130 ps) and minimizes inter-symbol interference at receiver input. |
| Dual-Mode Operation (Pin/SPI) | Pin mode provides LMH0384/LMH0344 footprint compatibility; SPI mode enables daisy-chained configuration and full register access - eliminates redesign when upgrading from legacy equalizers. |
| Auto Sleep with Fast Wake-Up | Enters 17-mW state within 200 µs of signal loss; resumes full operation in ~5 ms after signal reappearance - meets broadcast system timing requirements for seamless source switching. |
Applications
| Broadcast Video Router | HD-SDI Distribution Amplifier |
|---|---|
Use Scenario: Aggregating and switching multiple 3G-SDI camera feeds in live production trucks or OB vans. IC Role / Device Role / Timing Role: Adaptive equalizer restoring signal integrity after long coaxial runs from cameras to router inputs. Use Value: Enables reliable 200 m cable reach at 2.97 Gbps without repeaters, reducing point-of-failure count and rack space in mobile broadcast units. | Use Scenario: Fan-out of a single HD-SDI source to 8+ monitors or recording devices in studio control rooms. IC Role / Device Role / Timing Role: Signal conditioner compensating for insertion loss in passive splitter networks and long patch panels. Use Value: Maintains jitter <0.55 UI at 200 m (2.97 Gbps), preserving SMPTE ST 424 compliance across all outputs without reclocking. |
| 3G-SDI Reclocker Interface | Industrial Video Surveillance Hub |
Use Scenario: Driving LMH0346 or LMH0356 reclockers in high-density video processing blades. IC Role / Device Role / Timing Role: LVDS driver with programmable 0.8–1.2 V common-mode and 400–800 mVP-P swing matching reclocker input specs. Use Value: Eliminates level-shifting components and enables direct DC-coupled connection - reduces BOM cost and layout complexity. | Use Scenario: Centralized video aggregation from 16+ HD analog cameras converted to SDI over coaxial infrastructure. IC Role / Device Role / Timing Role: Low-power equalizer extending usable cable length beyond standard 100 m limits in warehouse or campus deployments. Use Value: Reduces need for mid-span repeaters or fiber conversion - lowers total installation cost while supporting −40°C to +85°C ambient operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SDI equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH0384SQX/NOPB | No SPI interface; fixed output swing (700 mVP-P) and common-mode (1.2 V); no auto-sleep mode. | Limited configurability - suitable only where pin-mode control suffices and power savings are secondary. | Select LMH0384SQX/NOPB for cost-sensitive, static installations requiring proven legacy performance without SPI management overhead. |
| LMH0344SQX/NOPB | Lower max data rate (1.5 Gbps); no de-emphasis; higher power (150 mW); same WQFN-16 footprint. | Restricted to HD-SDI (not 3G-SDI); lacks FR4 trace compensation - unsuitable for board-level integration with long traces. | Choose LMH0344SQX/NOPB only for SD/HD-SDI systems operating ≤1.485 Gbps where extended reach and trace loss compensation are unnecessary. |
Compared with LMH0384SQX/NOPB and LMH0344SQX/NOPB, the LMH0394SQX/NOPB adds SPI configurability, auto-sleep power reduction, programmable de-emphasis, and full 2.97 Gbps support - making it the only option among the three capable of future-proof 3G-SDI infrastructure with dynamic power and signal integrity optimization.
Availability
LMH0394SQX/NOPB is available at Aetrix Electronics and suitable for broadcast video routers, HD-SDI distribution amplifiers, and 3G-SDI reclocker interfaces requiring stable component supply across extended temperature and high-reliability deployment cycles.
Supply support for LMH0394SQX/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 LMH0394SQX/NOPB belongs to TI's high-speed serial interface product line, engineered specifically for SMPTE-compliant broadcast video signal conditioning - emphasizing adaptive equalization, ultra-low power, and seamless integration into professional video infrastructure.
FAQ
What SMPTE standards does the LMH0394SQX/NOPB support?
The LMH0394SQX/NOPB supports ST 424 (3G-SDI, 2.97 Gbps), ST 292 (HD-SDI, 1.485 Gbps), ST 344 (dual-link HD-SDI), ST 259 (SD-SDI, 270 Mbps), and DVB-ASI standards. It automatically adapts across this full range without external configuration changes, and its equalization performance is validated per ST RP 184 and RP 192 jitter measurement guidelines. The LMH0394SQX/NOPB maintains compliance across all supported rates using the same internal architecture.
How does the auto-sleep mode function in the LMH0394SQX/NOPB?
The LMH0394SQX/NOPB enters auto-sleep mode when the AUTO SLEEP pin is driven high and no valid SDI signal is detected by the carrier detect (CD) circuit. In this state, supply current drops to 17 mW typical, reducing thermal load and system power draw. The device wakes automatically within ~5 ms of signal reappearance, with full equalization functionality restored. Auto-sleep takes precedence over MUTE and BYPASS modes. The LMH0394SQX/NOPB also supports an SPI-configurable forced sleep mode independent of signal presence.
Can the LMH0394SQX/NOPB be used with legacy SDI equalizer footprints?
Yes - the LMH0394SQX/NOPB uses the same 16-pin WQFN (4 mm × 4 mm) package and pinout as the LMH0384, LMH0344, LMH0044, and LMH0074 in pin mode (SPI_EN = GND). All control signals (MUTE, BYPASS, AUTO SLEEP, CD) retain identical functions and electrical behavior. This allows drop-in replacement in existing designs without PCB layout changes, while retaining the option to upgrade to SPI-based configuration later via firmware update.
What is the purpose of the MUTEREF pin on the LMH0394SQX/NOPB?
The MUTEREF pin on the LMH0394SQX/NOPB sets the threshold voltage for the carrier detect (CD) circuit, determining the maximum cable length that can be equalized before the outputs are muted. When left unconnected, MUTEREF floats at ~1.3 V, enabling full cable reach. Applying a higher voltage (up to 2.0 V) lowers the CD sensitivity, causing earlier muting - useful for short-cable configurations to avoid false carrier detection from noise. The LMH0394SQX/NOPB also supports digital MUTEREF programming via SPI register 03h.
Does the LMH0394SQX/NOPB require external components for basic operation?
The LMH0394SQX/NOPB requires minimal external components: two 100 nF + 10 µF decoupling capacitors per VCC pin, AC-coupling capacitors (typically 100 nF) on SDI inputs, and proper 75 Ω termination on unused differential input. The AEC+ and AEC− pins support optional 1 µF external loop filter capacitors to enhance equalizer stability over extreme cable lengths. No pull-up/down resistors are needed on logic pins - internal biasing is provided. All critical biasing and termination are integrated, minimizing BOM count for the LMH0394SQX/NOPB.
LMH0394SQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Amplifier
- Interface:
- SPI Serial
- Voltage - Supply:
- 2.375V ~ 2.625V
- Supplier Device Package:
- 16-WQFN (4x4)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LMH0394SQX/NOPB FAQ
1.How can I place an order for LMH0394SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0394SQX/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 LMH0394SQX/NOPB reliable?
The price and inventory of LMH0394SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0394SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH0394SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0394SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0394SQX/NOPB?
LMH0394SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0394SQX/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 LMH0394SQX/NOPB?
For technical support, including LMH0394SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0394SQX/NOPB requirements.
6.How does Aetrix verify that LMH0394SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH0394SQX/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 LMH0394SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH0394SQX/NOPB?
All LMH0394SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH0394SQX/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 LMH0394SQX/NOPB part is unused and in its original packaging.
Return procedure for LMH0394SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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