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Texas Instruments LMH0346SQX/NOPB
- Part No.:
- LMH0346SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMH0346SQX/NOPB.pdf
- Description:
- IC VIDEO RECLOCKER 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,640
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Product details
Overview
LMH0346SQX/NOPB from Texas Instruments is a 3 Gbps HD/SD SDI reclocker IC that retimes serial digital video data conforming to SMPTE 424M (2.97 Gbps), SMPTE 292M (1.485 Gbps), and SMPTE 259M(C) (270 Mbps) standards, with DVB-ASI support at 270 Mbps. It features dual differential outputs, automatic data-rate detection, and jitter suppression in broadcast routing, video processing, and format conversion equipment.
For engineers reviewing the LMH0346SQX/NOPB datasheet, LMH0346SQX/NOPB pinout, LMH0346SQX/NOPB application, or LMH0346SQX/NOPB equivalent, key selection considerations include its 2.97 Gbps serial data rate capability, dual LVPECL-compatible differential outputs (one configurable as clock), 27 MHz crystal reference requirement, industrial temperature range (−40°C to +85°C), and WQFN-24 package footprint compatibility with LMH0046/LMH0026.
Technical Context
The LMH0346SQX/NOPB implements a PLL-based reclocking architecture with adaptive loop bandwidth (275 kHz at 270 Mbps, 2.75 MHz at 2970 Mbps) to suppress accumulated input jitter. It performs full-rate CML-to-CML retiming with internal VCO synchronization to a 27 MHz reference.
Its control logic supports both auto-rate detection and manual rate selection via RATE0/RATE1 inputs, while SCO_EN configures the second output (SCO/SDO2) as either retimed serial data or low-jitter data-rate clock aligned within 10% of the data interval center. Lock detect (LOCK DET) and SD/HD indicator outputs provide real-time status for system-level timing coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Serial Data Rates | 270 Mbps, 1.483/1.485 Gbps, 2.967/2.97 Gbps - supports full SMPTE 259M(C)/292M/424M and DVB-ASI compliance |
| Output Jitter (2970 Mbps) | 0.06–0.08 UIP-P - enables robust signal integrity over long coaxial cable runs in broadcast infrastructure |
| Supply Voltage | 3.3 V ±5% - single-rail operation simplifies power design in video interface modules |
| Power Consumption | 126 mA typical @ 2970 Mbps - ~370 mW total, suitable for thermally constrained HD/3G video boards |
| Operating Temperature | −40°C to +85°C - qualified for industrial and broadcast equipment environments |
| Differential Output Level | 750 mVP-P into 100 Ω - meets SMPTE-compliant drive strength for downstream cable drivers |
| Reference Clock | 27 MHz ±50 ppm - enables stable PLL lock without external frequency synthesis |
Pinout & Package
The LMH0346SQX/NOPB is packaged in a 5 mm × 4 mm, 24-pin WQFN (NHZ) with exposed die attach pad (DAP) electrically connected to VEE (ground). The DAP must be soldered to a solid ground plane for thermal management and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 10, 11, 23 | VEE | Negative supply terminal; all five pins connect to internal ground and must be tied to PCB ground plane |
| 2, 3, 4, 5, 6, 14, 15, 16, 17, 18, 19 | LF1, LF2, RATE0, RATE1, SDI, SDI, BYPASS/AUTO-BP, OUTPUT MUTE, XTAL IN/EXT CLK, XTAL OUT, LOCK DET, SCO/SDO2, SCO/SDO2, VCCO, VCCO, SDO, SDO, SD/HD, SCO_EN | Functional I/Os - includes loop filter, rate select, data/clock I/O, status indicators, and mode controls per datasheet Table 1 |
| 7, 8, 9, 12, 13, 20, 21, 22, 24 | VCC, VCCO, SDO, SDO, SCO/SDO2, SCO/SDO2, SCO_EN, RSVD, DAP | Power, output, and reserved terminals - RSVD (pin 22) must remain unconnected; DAP is primary ground path |
Key Features
| Feature | Design Value |
|---|---|
| Auto-rate detection | Identifies 270/1485/2970 Mbps streams without external configuration, reducing firmware overhead in multi-standard video systems |
| Configurable second output | SCO/SDO2 pin toggles between retimed serial data or low-jitter data-rate clock (270/1485/2970 MHz), enabling flexible clock distribution or dual-output fanout |
| Lock detect & SD/HD indicator | LOCK DET asserts high when PLL is locked; SD/HD pin outputs logic-high for SD (270 Mbps) and logic-low for HD/3G - usable for dynamic cable driver edge-rate control |
| LVPECL-compatible I/O | Accepts and drives differential CML signals compatible with industry-standard SDI equalizers (e.g., LMH0344) and drivers (e.g., LMH0302) without level-shifting |
| Industrial temperature rating | Validated operation from −40°C to +85°C ensures reliability in broadcast racks, OB vans, and production switchers |
Applications
| Digital Video Routers & Switchers | Digital Video Processing Equipment |
|---|---|
Use Scenario: Reclocking SDI signals across matrix switcher backplanes with multiple cascaded stages. IC Role / Device Role / Timing Role: Reclocker suppressing accumulated jitter from upstream equalizers and interconnects before retransmission. Use Value: Maintains SMPTE-compliant eye opening after ≥5 switcher hops, preventing bit errors in 3G-SDI distribution. | Use Scenario: Signal conditioning in real-time video scalers and frame synchronizers handling mixed SD/HD/3G sources. IC Role / Device Role / Timing Role: Rate-agnostic retiming engine synchronizing asynchronous inputs to local system clock domain. Use Value: Enables seamless format conversion by eliminating timing drift between source and destination clocks. |
| DVB-ASI Equipment | Video Standards Converters |
Use Scenario: Retiming MPEG-2 transport streams in ASI-to-IP gateways for broadcast contribution networks. IC Role / Device Role / Timing Role: Jitter-cleaning buffer for 270 Mbps DVB-ASI data prior to encoding or packetization. Use Value: Reduces BER in ASI links by suppressing low-frequency wander introduced by long coax runs. | Use Scenario: Bridging legacy SD-SDI feeds into modern UHD production workflows using up/down/cross converters. IC Role / Device Role / Timing Role: Input-stage reclocker ensuring clean, low-jitter reference for sample-rate conversion engines. Use Value: Prevents timing-induced artifacts (e.g., macroblocking, audio sync loss) during real-time standards translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SDI reclocking applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH0346MH/NOPB | Same silicon, 20-pin HTSSOP package (6.5 × 4.4 mm); higher θJA (26.6°C/W) vs. WQFN's 33.0°C/W | Preferred where board space permits larger footprint and thermal vias are less critical | Select LMH0346MH/NOPB when HTSSOP layout reuse or legacy footprint compatibility is required |
| LMH0384SQ/NOPB | Successor device with extended 12G-SDI support (11.88 Gbps), lower output jitter (0.03 UIP-P), and integrated cable driver | Suitable for next-gen UHD/4K infrastructure; not drop-in compatible due to different pinout and feature set | Choose LMH0384SQ/NOPB only for new 12G-SDI designs; LMH0346SQX/NOPB remains optimal for cost-sensitive 3G-SDI deployments |
Compared with LMH0346MH/NOPB, the LMH0346SQX/NOPB offers superior thermal performance in compact layouts but requires tighter layout control for the WQFN DAP grounding; versus LMH0384SQ/NOPB, it provides proven 3G-SDI functionality at lower BOM cost and simpler power sequencing, without overengineering for non-12G use cases.
Availability
LMH0346SQX/NOPB is available at Aetrix Electronics and suitable for digital video routers, broadcast production switchers, and DVB-ASI gateways requiring stable component supply across long-lifecycle broadcast equipment programs.
Supply support for LMH0346SQX/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 LMH0346SQX/NOPB belongs to TI's high-speed video interface product line, engineered specifically for SMPTE-compliant SDI signal integrity restoration in broadcast infrastructure, post-production, and professional AV systems.
FAQ
What video standards does the LMH0346SQX/NOPB support?
The LMH0346SQX/NOPB supports SMPTE 259M(C) at 270 Mbps (SD-SDI), SMPTE 292M at 1.485 Gbps (HD-SDI), and SMPTE 424M at 2.97 Gbps (3G-SDI), plus DVB-ASI operation at 270 Mbps. It does not support 6G-SDI or 12G-SDI. All supported rates are explicitly validated in the SNLS248J datasheet AC Electrical Characteristics table.
Does the LMH0346SQX/NOPB require an external crystal?
Yes, the LMH0346SQX/NOPB requires a 27 MHz parallel-resonant crystal (18–20 pF load capacitance, ≤40 Ω series resistance) connected between XTAL IN/EXT CLK and XTAL OUT pins. An external 27 MHz LVCMOS clock may alternatively be driven into XTAL IN/EXT CLK, but crystal operation is the default and recommended configuration per TI application guidance.
How is the second output (SCO/SDO2) configured on the LMH0346SQX/NOPB?
The SCO_EN pin controls the LMH0346SQX/NOPB's second output: when SCO_EN is logic high, SCO/SDO2 delivers a low-jitter serial data-rate clock (270/1485/2970 MHz); when low, it outputs retimed serial data. SCO_EN has an internal pulldown, so the default state is data output. This configuration is independent of the primary SDO output, which always delivers retimed data.
What is the function of the SD/HD output pin on the LMH0346SQX/NOPB?
The SD/HD pin on the LMH0346SQX/NOPB is a registered indicator that outputs logic-high when locked to 270 Mbps (SD) and logic-low when locked to 1.485/2.97 Gbps (HD/3G). It is valid only when LOCK DET is high and defaults to HD (low) when unlocked. This signal is commonly used to configure edge rates on downstream cable drivers like the LMH0302 for SMPTE compliance.
Can the LMH0346SQX/NOPB operate without reclocking (bypass mode)?
Yes, the LMH0346SQX/NOPB supports bypass mode via the BYPASS/AUTO-BP pin. When pulled high, it passes SDI directly to SDO without reclocking. In AUTO-BP mode (pin low), it automatically bypasses reclocking when the PLL is unlocked or detects an unsupported data rate (e.g., 143 Mbps). Output mute and lock detect behavior remain active in both modes.
LMH0346SQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Reclocker
- Applications:
- Professional Video
- Standards:
- DVB-ASI, SMPTE
- Control Interface:
- Serial
- Voltage - Supply:
- 3.135V ~ 3.465V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-WQFN (4x5)
LMH0346SQX/NOPB FAQ
1.How can I place an order for LMH0346SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0346SQX/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 LMH0346SQX/NOPB reliable?
The price and inventory of LMH0346SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0346SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH0346SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0346SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0346SQX/NOPB?
LMH0346SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0346SQX/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 LMH0346SQX/NOPB?
For technical support, including LMH0346SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0346SQX/NOPB requirements.
6.How does Aetrix verify that LMH0346SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH0346SQX/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 LMH0346SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH0346SQX/NOPB?
All LMH0346SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH0346SQX/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 LMH0346SQX/NOPB part is unused and in its original packaging.
Return procedure for LMH0346SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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