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Texas Instruments LMH0394SQE/NOPB
- Part No.:
- LMH0394SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LMH0394SQE/NOPB.pdf
- Description:
- IC INTERFACE SPECIALIZED 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:477
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Product details
Overview
LMH0394SQE/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 data rates from 125 Mbps to 2.97 Gbps, delivers 200 m extended reach over Belden 1694A coax at 2.97 Gbps, consumes only 115 mW in normal operation, and features programmable de-emphasis for FR4 trace compensation - deployed in SDI routers, distribution amplifiers, and reclocker input stages.
For engineers reviewing the LMH0394SQE/NOPB datasheet, LMH0394SQE/NOPB pinout, LMH0394SQE/NOPB application, or LMH0394SQE/NOPB equivalent, key selection criteria include SMPTE ST 424/292/259 compliance, auto-sleep power management, LVDS output common-mode voltage adjustability (0.8–1.2 V), and SPI-configurable launch amplitude optimization for pathological video patterns.
Technical Context
The LMH0394SQE/NOPB implements a multi-stage adaptive equalizer filter with active sensing circuitry that dynamically adjusts gain and bandwidth based on input signal energy and cable loss characteristics. Its DC restoration block ensures robust handling of long-run pathological sequences per ST RP 178 and RP 198.
It operates in two mutually exclusive modes: pin mode (SPI_EN = GND) for drop-in replacement compatibility with LMH0384/LMH0344, and SPI mode (SPI_EN = VCC) enabling daisy-chained register access to output swing (400–800 mVP–P), de-emphasis level, MUTEREF threshold, and cable-length indicator - all while maintaining 100-Ω internally terminated LVDS outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 2.97 Gbps - supports full SMPTE ST 259 (270 Mbps), ST 292 (1.485 Gbps), and ST 424 (2.97 Gbps) video standards. |
| Cable Reach (Belden 1694A) | 200 m at 2.97 Gbps - enables long-haul SDI routing without repeaters in broadcast control rooms. |
| Supply Current | 65 mA typical at 2.97 Gbps (115 mW @ 2.5 V) - reduces thermal load in dense video processing modules. |
| Power-Save Mode | 7 mA typical - auto-sleep activation via AUTO SLEEP pin disables equalization when no carrier is detected. |
| Output Interface | Internally terminated 100-Ω LVDS - eliminates external termination resistors and simplifies PCB layout for SDO/SDO outputs. |
| Input Return Loss | ≥10 dB (1.5–3.0 GHz) - maintains signal integrity against high-frequency cable attenuation and crosstalk. |
| De-Emphasis Support | Programmable for up to 40″ FR4 trace loss - compensates for board-level dispersion between equalizer and downstream reclocker. |
Pinout & Package
LMH0394SQE/NOPB uses a 16-pin WQFN package (4.00 mm × 4.00 mm) with exposed thermal pad (DAP) connected to VEE (ground). Pin functions differ between pin mode (SPI_EN = GND) and SPI mode (SPI_EN = VCC); both configurations share identical physical footprint and power/ground assignments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, DAP | VEE / Ground | Negative supply reference and thermal path - must be solidly connected to PCB ground plane. |
| 2, 3 | SDI / SDI | Differential true/complement analog inputs - require AC coupling and proper single-ended termination per Figure 8/9. |
| 4 | SPI_EN | Mode select: GND = pin mode (LMH0384-compatible), VCC = SPI mode (daisy-chain register access). |
| 5, 6 | AEC+, AEC− | External loop filter capacitor connections (1 µF optional) - set adaptive equalizer convergence behavior. |
| 7 | BYPASS | LVCMOS input: H = disable equalization, L = enable adaptive filtering - used for diagnostics or fixed-gain bypass. |
| 8 | MUTEREF | Analog threshold input: sets CD mute point inversely proportional to cable length (0.8–1.3 V range). |
| 10, 11 | SDO / SDO | LVDS differential outputs - internally terminated, DC-coupled compatible, support programmable swing/de-emphasis. |
| 12 | AUTO SLEEP | LVCMOS input: H = enable deep power-down on carrier loss, L = force continuous operation. |
| 13, 16 | VCC | +2.5 V supply pins - require local 100-nF ceramic decoupling per pin per TI layout guidelines. |
| 14 | MUTE | LVCMOS input: H = force outputs to logic-1 muted state, L = enable normal data transmission. |
| 15 | CD | LVCMOS output: H = no valid input carrier detected, L = stable SDI signal present - drives MUTE when tied together. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Equalization with Active Sensing | Real-time adjustment of gain/bandwidth based on input energy detection - maintains eye opening across varying cable lengths and launch amplitudes. |
| Programmable Output De-Emphasis | Compensates for FR4 interconnect loss up to 40″ - preserves signal integrity between equalizer and FPGA/ASIC receiver inputs. |
| Dual-Mode Control Architecture | Pin mode enables legacy drop-in replacement; SPI mode supports daisy-chained configuration of multiple devices with full register access. |
| DC Restoration Block | Self-biasing circuitry handles pathological video patterns (e.g., long strings of 0s/1s) per ST RP 178/RP 198 - prevents baseline wander in HD/SD video streams. |
| Auto Sleep Power Management | Reduces supply current from 65 mA to 7 mA when no carrier is detected - extends uptime in always-on broadcast systems with intermittent signal paths. |
Applications
| Broadcast Video Router Input Stage | SDI Distribution Amplifier Front-End |
|---|---|
Use Scenario: Receives SDI signals from multiple camera feeds over long coax runs (up to 200 m) before switching and retransmission. IC Role / Device Role / Timing Role: Adaptive equalizer restoring signal integrity at router input - compensates for frequency-dependent loss and jitter accumulation. Use Value: Enables reliable 3G-SDI switching without manual gain tuning or external repeaters, reducing system latency and component count. | Use Scenario: Conditions incoming SDI signals prior to fan-out to multiple monitors, recorders, or processing units in OB vans. IC Role / Device Role / Timing Role: Cable equalizer with auto-sleep - maintains signal fidelity while minimizing power draw during idle periods between live segments. Use Value: Extends battery life in mobile broadcast units and eliminates need for thermal derating in compact chassis designs. |
| HD/SD Reclocker Input Conditioning | Studio Camera Control Interface |
Use Scenario: Drives LMH0346/LMH0356 reclockers after long cable runs in studio wiring closets. IC Role / Device Role / Timing Role: LVDS driver with programmable common-mode voltage (0.8–1.2 V) and swing (400–800 mVP–P) - matches input requirements of downstream reclockers. Use Value: Eliminates level-shifting components and ensures deterministic setup/hold timing for retiming circuits. | Use Scenario: Embedded in camera-top processors receiving return video from vision mixers over hybrid fiber-coax links. IC Role / Device Role / Timing Role: Adaptive equalizer with carrier detect (CD) output - provides real-time link status feedback to camera firmware for failover decisions. Use Value: Enables automatic switchover to backup video path within <5 ms of carrier loss, meeting broadcast continuity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SDI equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH0384SQE/NOPB | No SPI interface; fixed output swing (700 mVP–P); no programmable MUTEREF or cable length indicator. | Limited to pin-mode-only systems requiring minimal configuration; lacks auto-sleep and de-emphasis. | Select when replacing legacy LMH0344 designs where SPI functionality is unnecessary and cost sensitivity is high. |
| LMH0344SQ/NOPB | Lower max data rate (1.5 Gbps); no auto-sleep; no de-emphasis; requires external termination resistors. | Restricted to SD/HD-SDI (ST 259/292) only; higher power (150 mW); no FR4 trace compensation capability. | Choose for cost-constrained SDI systems operating ≤1.485 Gbps where extended reach and low-power sleep are not required. |
Compared with LMH0384SQE/NOPB and LMH0344SQ/NOPB, the LMH0394SQE/NOPB adds SPI configurability, 2.97 Gbps support, auto-sleep, and de-emphasis - making it the only option for future-proof 3G-SDI infrastructure requiring flexible power management and board-level signal conditioning.
Availability
LMH0394SQE/NOPB is available at Aetrix Electronics and suitable for broadcast video routers, SDI distribution amplifiers, and HD/SD reclocker input stages requiring stable component supply, long-cable signal integrity, and low-power operation in industrial temperature environments.
Supply support for LMH0394SQE/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 company specializing in analog and embedded processing technologies, with leadership in high-speed interface solutions for professional video and communications markets.
The LMH0394SQE/NOPB belongs to TI's high-speed SDI equalizer product line, engineered specifically for SMPTE-compliant broadcast infrastructure demanding extended cable reach, ultra-low jitter, and adaptive power management in space-constrained enclosures.
FAQ
What is the maximum supported data rate for LMH0394SQE/NOPB?
The LMH0394SQE/NOPB supports a maximum data rate of 2.97 Gbps, fully compliant with SMPTE ST 424 for 3G-SDI applications. This is confirmed in Section 6.6 of the SNLS312M datasheet under BRMAX specification, and validated by equalization performance up to 200 meters on Belden 1694A coax at this rate.
Does LMH0394SQE/NOPB require external termination resistors on its LVDS outputs?
No, LMH0394SQE/NOPB does not require external termination resistors on its SDO/SDO outputs. As stated in Section 7.3.5 and Table 6.5, it features internally terminated 100-Ω LVDS outputs - simplifying PCB layout and eliminating discrete termination components typically needed for differential signaling interfaces.
How does the AUTO SLEEP function operate in LMH0394SQE/NOPB?
The AUTO SLEEP function in LMH0394SQE/NOPB powers down the equalizer core when no valid SDI carrier is detected, reducing supply current from 65 mA to 7 mA. When AUTO SLEEP pin is high, wake-up occurs automatically within ~5 ms of signal reacquisition, and power-down completes in under 200 µs - ensuring minimal impact on broadcast system timing budgets.
Can LMH0394SQE/NOPB be used with single-ended SDI inputs?
Yes, LMH0394SQE/NOPB accepts single-ended SDI inputs as specified in Section 7.3.4. The device requires AC coupling and proper termination of the unused complementary input (e.g., 75 Ω to ground), as shown in Figures 8 and 9 of the SNLS312M datasheet - supporting integration with legacy single-ended coax drivers.
What is the purpose of the MUTEREF pin on LMH0394SQE/NOPB?
The MUTEREF pin on LMH0394SQE/NOPB sets the carrier detect (CD) threshold voltage, determining the maximum cable length before automatic muting. Applying a voltage between 0.8 V and 1.3 V inversely scales the detect point - e.g., higher MUTEREF voltage reduces allowable cable length before CD asserts high and triggers MUTE. It may be left floating (default 1.3 V) or grounded for standard operation.
LMH0394SQE/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
LMH0394SQE/NOPB FAQ
1.How can I place an order for LMH0394SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0394SQE/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 LMH0394SQE/NOPB reliable?
The price and inventory of LMH0394SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0394SQE/NOPB is usually 5 days.
3.What payment methods are accepted for LMH0394SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0394SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0394SQE/NOPB?
LMH0394SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0394SQE/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 LMH0394SQE/NOPB?
For technical support, including LMH0394SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0394SQE/NOPB requirements.
6.How does Aetrix verify that LMH0394SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH0394SQE/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 LMH0394SQE/NOPB meets industry standards.
7.What is the process for return or replacement of LMH0394SQE/NOPB?
All LMH0394SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH0394SQE/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 LMH0394SQE/NOPB part is unused and in its original packaging.
Return procedure for LMH0394SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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