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Texas Instruments LMH0034MA
- Part No.:
- LMH0034MA
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH0034MA.pdf
- Description:
- IC INTERFACE SPECIALIZED 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
LMH0034MA from Texas Instruments is an SMPTE 292M/259M adaptive 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 coax at 1.485 Gbps, and delivering 750 mVP–P differential output swing into 50Ω loads in broadcast-grade SDI receivers.
For engineers reviewing the LMH0034MA datasheet, LMH0034MA pinout, LMH0034MA application, or LMH0034MA equivalent, this device is selected for high-fidelity SDI signal recovery in professional video equipment where adaptive equalization, cable-length indication, programmable mute threshold, and DC restoration are required under 3.3V single-supply operation.
Technical Context
The LMH0034MA implements a multi-stage adaptive filter with automatic equalization control (AEC) loop stabilized by external 1 µF capacitor across AEC+ and AEC− pins; its DC restoration block handles pathological SMPTE RP-178/RP-198 video patterns without baseline wander. The CLI pin provides analog voltage inversely proportional to equalized cable length, validated on Belden 1694A up to 400 m at 270 Mbps.
It features bi-directional CD/MUTE pin for carrier detect output and manual mute override, plus BYPASS pin disabling both equalization and DC restoration; input supports AC-coupled single-ended or differential drive, while outputs are internally 50Ω-terminated differential drivers compliant with SMPTE 292M eye mask requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 1.485 Gbps - enables use across SD-SDI (270 Mbps), HD-SDI (1.485 Gbps), and dual-link HD-SDI (2.97 Gbps per channel with multiplexing) |
| Equalization Capacity | Up to 200 m Belden 1694A at 1.485 Gbps - ensures full SMPTE 292M compliance with margin for installation loss and connector degradation |
| Output Swing | 750 mVP–P differential into 50Ω - meets SMPTE 259M/292M output amplitude specification for reliable receiver sensitivity |
| Supply & Power | 3.3 V ±5%, 63–77 mA typical ICC - compatible with standard video system power rails; current decreases with longer cable lengths |
| Input Return Loss | 15–20 dB (5 MHz–1.5 GHz) - minimizes reflections on PCB traces and coax interface, critical for maintaining SDI eye integrity |
| Cable Length Indicator | CLI voltage: 2.5 V (0 m) to 1.9 V (max cable) - provides real-time analog feedback for diagnostics, auto-ranging, or front-panel display |
| Mute Threshold Control | MUTEREF adjustable 0.7–1.3 V - sets precise cable-length-based muting point to suppress noise during signal loss or dropout |
Pinout & Package
LMH0034MA is housed in a 16-pin SOIC (D package), 1.27 mm pitch, RoHS-compliant with SN lead finish and MSL Level-1 rating. Dimensions: 10.3 mm × 6.5 mm × 2.3 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLI) | Cable Length Indicator output | Analog voltage inversely scaled to equalized cable length; requires no load for accuracy |
| 2 (VCC) | Positive supply input | 3.3 V main power rail; decoupling capacitor required near pin |
| 3, 6, 11, 14 (VEE) | Ground reference | Four dedicated ground pins minimize ground bounce and improve common-mode rejection |
| 4, 5 (SDI / SDI) | Differential serial data input | AC-coupled true/complement inputs accepting SMPTE-compliant video data; supports single-ended via pin 4 only |
| 7 (AEC+), 8 (AEC−) | AEC loop filter connection | External 1 µF capacitor sets adaptation speed and stability; determines convergence time for varying cable lengths |
| 9 (BYPASS) | Equalization disable control | High = bypasses both equalizer and DC restoration; used for test mode or low-rate legacy signals |
| 10 (MUTEREF) | Mute reference voltage input | Adjusts automatic mute trigger point; floating = maximum equalization before muting |
| 12, 13 (SDO / SDO) | Differential serial data output | 50Ω internally terminated; delivers 750 mVP–P differential swing without external resistors |
| 15 (VCC) | Secondary positive supply | Second VCC pin improves power delivery integrity to output driver stage |
| 16 (CD/MUTE) | Bi-directional carrier detect/mute | Outputs high when no valid signal detected; accepts high/low input to force mute/enable regardless of signal presence |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Equalization | Real-time adjustment of gain and bandwidth based on input signal spectrum, enabling robust operation across variable cable lengths and types without manual tuning |
| DC Restoration | Self-biasing circuit eliminates baseline wander on pathological video patterns (e.g., color bars), ensuring stable decision thresholds in downstream CDRs |
| Programmable Muting | MUTEREF pin allows setting exact cable-length threshold for automatic output muting-prevents noise burst during signal dropout or cable disconnect |
| Cable Length Indicator | CLI analog output enables system-level diagnostics, auto-calibration, or user-facing cable-status reporting without external ADC |
| Form-Fit-Function Replacement | Direct drop-in replacement for Gennum GS1524/GS1524A-identical pinout, footprint, and electrical behavior simplifies legacy design upgrades |
Applications
| Broadcast Camera Interface | HD-SDI Distribution Amplifier |
|---|---|
|
Use Scenario: High-definition video signal transmission from camera head to base station over long coaxial runs in live production trucks. IC Role / Device Role / Timing Role: Adaptive equalizer restoring SMPTE 292M eye opening degraded by 150 m Belden 1694A cable loss at 1.485 Gbps. Use Value: Maintains >30 mV vertical eye opening margin after equalization, enabling error-free decoding by downstream reclocker without manual gain adjustment. |
Use Scenario: Signal splitting and retransmission in broadcast master control rooms with multiple output paths of varying cable lengths. IC Role / Device Role / Timing Role: Input equalizer stage before fanout buffer, compensating for unequal path losses across distribution tree branches. Use Value: CLI output feeds microcontroller to dynamically adjust output driver bias per branch, minimizing inter-channel skew and jitter accumulation. |
| Medical Endoscopy Video Processor | Professional Video Monitor Input |
|
Use Scenario: Real-time HD video acquisition from rigid/flexible endoscopes using miniaturized coax cabling inside surgical carts. IC Role / Device Role / Timing Role: Front-end equalizer recovering 270 Mbps SD-SDI or 1.485 Gbps HD-SDI from lossy 5–10 m micro-coax assemblies. Use Value: BYPASS pin disables equalization during low-bandwidth calibration modes, reducing power consumption and avoiding unnecessary signal processing. |
Use Scenario: Input conditioning stage in calibrated reference monitors used for color grading and quality assurance. IC Role / Device Role / Timing Role: Signal integrity conditioner ensuring SMPTE 259M/292M compliance at monitor input, rejecting common-mode noise from shared facility grounds. Use Value: Dual VCC pins and four VEE pins reduce ground impedance, lowering RMS jitter to <0.25 UI at 1.485 Gbps-critical for pixel-perfect timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adaptive SDI equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GS1524A | Identical pinout and function; same 16-pin SOIC package; slightly higher 85°C max operating temperature vs. LMH0034MA's 85°C rating (no practical difference) | Legacy Gennum part still supported in older broadcast gear; lacks TI's enhanced ESD rating (8 kV HBM vs. GS1524A's 4 kV) | Select GS1524A only for direct replacement in existing Gennum-designed boards where TI qualification is not required. |
| LMH0344MA | Successor device with extended 2.97 Gbps support (SMPTE 424M), lower 55 mW typical power, and integrated 100Ω differential input termination | Required for 3G-SDI systems; not backward-compatible due to different pin functions (e.g., no CLI, added REFCLK input) | Choose LMH0344MA for new 3G-SDI designs; LMH0034MA remains optimal for cost-sensitive 1.5G-SDI deployments with CLI or BYPASS needs. |
Compared with GS1524A, LMH0034MA offers superior ESD protection and TI's long-term supply commitment; versus LMH0344MA, it retains CLI and BYPASS functionality essential for field-serviceable SDI infrastructure where cable-length visibility and test-mode flexibility are prioritized over 3G-SDI support.
Availability
LMH0034MA is available at Aetrix Electronics and suitable for broadcast video equipment, medical imaging systems, and professional AV infrastructure requiring stable component supply, long-lifecycle assurance, and SMPTE-compliant signal integrity.
Supply support for LMH0034MA 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 video signal conditioning ICs.
The LMH0034MA belongs to TI's LMH high-speed video interface product line, engineered specifically for SMPTE-compliant serial digital video equalization in professional broadcast, medical, and industrial imaging systems.
FAQ
What data standards does the LMH0034MA support?
The LMH0034MA supports SMPTE 259M (SD-SDI at 270 Mbps), SMPTE 292M (HD-SDI at 1.485 Gbps), and SMPTE 344M (ED-SDI at 540 Mbps), plus DVB-ASI at 270 Mbps. It is not compliant with SMPTE 424M (3G-SDI) or HDMI protocols. All supported standards are explicitly verified in the LMH0034MA datasheet SNLS213H under Features and Electrical Characteristics tables.
Does the LMH0034MA require external passive components to operate?
Yes, the LMH0034MA requires three mandatory external components: a 1.0 µF capacitor between AEC+ and AEC− pins for loop stability, 1.0 µF AC-coupling capacitors on SDI inputs, and local 0.1 µF VCC decoupling capacitors. No external termination resistors are needed-the SDO outputs are internally 50Ω-terminated, and input return loss meets spec on properly designed PCBs per AN-1372.
How does the CLI (Cable Length Indicator) output function in the LMH0034MA?
The CLI pin on the LMH0034MA outputs an analog voltage inversely proportional to equalized cable length-2.5 V at 0 m decreasing to ~1.9 V at maximum equalization (e.g., 400 m at 270 Mbps). This voltage is only valid when an input signal is present. It enables real-time diagnostics, auto-ranging, or front-panel display without external ADC, and is calibrated per Belden 1694A cable characteristics in the LMH0034MA datasheet Figure 2.
Can the LMH0034MA be used with single-ended input signals?
Yes, the LMH0034MA accepts single-ended input on SDI pin 4 (with SDI pin 5 grounded), as confirmed in the "INPUT INTERFACING" section of the LMH0034MA datasheet. Input must be AC-coupled; transformer coupling is not supported. Differential input is preferred for best common-mode noise rejection, but single-ended operation is fully characterized and functional across the full 125 Mbps–1.485 Gbps range.
Is the LMH0034MA pin-compatible with the Gennum GS1524 series?
Yes, the LMH0034MA is form-fit-function compatible with the GS1524 and GS1524A, sharing identical 16-pin SOIC (D) package, pinout, and electrical behavior. TI explicitly states this replacement capability in the LMH0034MA datasheet under "REPLACING THE GENNUM GS1524". No PCB changes are required, and all control pins (BYPASS, MUTEREF, CD/MUTE) retain identical functionality and timing.
LMH0034MA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- SMPTE 292M / 259 M
- Interface:
- Serial
- Voltage - Supply:
- 3.135V ~ 3.465V
- Supplier Device Package:
- 16-SOIC
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LMH0034MA FAQ
1.How can I place an order for LMH0034MA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0034MA 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 LMH0034MA reliable?
The price and inventory of LMH0034MA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0034MA is usually 5 days.
3.What payment methods are accepted for LMH0034MA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0034MA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0034MA?
LMH0034MA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0034MA 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 LMH0034MA?
For technical support, including LMH0034MA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0034MA requirements.
6.How does Aetrix verify that LMH0034MA is sourced from the original manufacturer or authorized distributors?
All LMH0034MA 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 LMH0034MA meets industry standards.
7.What is the process for return or replacement of LMH0034MA?
All LMH0034MA units undergo pre-shipment inspection (PSI). If there is an issue with LMH0034MA, 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 LMH0034MA part is unused and in its original packaging.
Return procedure for LMH0034MA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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