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Texas Instruments LMH0034MAX/NOPB
- Part No.:
- LMH0034MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH0034MAX/NOPB.pdf
- Description:
- IC INTERFACE SPECIALIZED 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,631
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Product details
Overview
LMH0034MAX/NOPB from Texas Instruments is a monolithic SMPTE 292M/344M/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 featuring integrated DC restoration, CLI voltage output, and bi-directional CD/MUTE control - deployed in broadcast-grade SDI receivers and camera back-ends.
For engineers reviewing the LMH0034MAX/NOPB datasheet, LMH0034MAX/NOPB pinout, LMH0034MAX/NOPB application, or LMH0034MAX/NOPB equivalent, this device is selected for high-speed coaxial signal integrity restoration in SMPTE-compliant infrastructure where cable loss compensation, carrier detection, and programmable mute threshold are critical design requirements.
Technical Context
The LMH0034MAX/NOPB implements a multi-stage adaptive filter with automatic equalization control (AEC) loop stabilized by an external 1 µF capacitor across AEC+ and AEC− pins; its DC restoration block self-biases to handle pathological SMPTE RP-178/RP-198 video patterns without baseline wander.
It features a differential input stage with 1.3 kΩ single-ended input resistance and 1 pF capacitance, 50 Ω differential outputs delivering 750 mVP–P, and a cable-length-indicator (CLI) output that scales linearly from 2.5 V (0 m) to 1.9 V (max cable), validated per Belden 1694A performance curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 1.485 Gbps - supports SD-SDI (270 Mbps), HD-SDI (1.485 Gbps), and dual-link HD-SDI (2.97 Gbps via two channels) |
| Equalization Capacity | Up to 200 m Belden 1694A at 1.485 Gbps - enables long-haul HD-SDI routing without repeaters in broadcast trucks and OB vans |
| Input Interface | Differential or single-ended AC-coupled input - eliminates need for transformers and supports legacy and modern PCB layouts |
| Output Drive | 50 Ω differential outputs, 750 mVP–P swing - directly drives standard 75 Ω coaxial transmission lines with minimal external components |
| Power Supply | Single 3.3 V ±5% supply - simplifies power architecture versus dual-rail alternatives and draws 63–77 mA depending on cable length |
| Cable Length Indicator | CLI output voltage: 2.5 V (0 m) to 1.9 V (max equalized length) - provides real-time analog feedback for system diagnostics and auto-calibration |
| Mute Threshold Control | MUTEREF pin accepts 0.7–1.3 V reference - sets precise cable-length-based muting point to suppress noise during signal loss or cable disconnect |
Pinout & Package
LMH0034MAX/NOPB is housed in a 16-pin SOIC (D package), 1.27 mm pitch, with exposed pad not present; thermal resistance θJA = 115 °C/W, suitable for industrial ambient (0°C to +85°C) operation without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLI) | Cable Length Indicator output | Analog voltage inversely proportional to equalized cable length - used for system-level health monitoring and fault logging |
| 2 (VCC) | Positive supply rail | +3.3 V main power input; two VCC pins (2 & 15) reduce IR drop and improve PSRR |
| 3, 6, 11, 14 (VEE) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable common-mode rejection in high-speed operation |
| 4, 5 (SDI / SDI) | Differential serial data input | True/complement inputs accept AC-coupled SDI signals; 1.3 kΩ input resistance and 1 pF capacitance optimize impedance matching |
| 7 (AEC+), 8 (AEC−) | AEC loop filter connection | External 1 µF capacitor sets AEC loop bandwidth - determines adaptation speed and stability over varying cable loss profiles |
| 9 (BYPASS) | Equalization disable control | Logic-high disables both equalizer filter and DC restoration - used for test mode or low-data-rate bypass applications |
| 10 (MUTEREF) | Mute reference input | Adjusts carrier-detect sensitivity; floating = maximum equalization before mute; 1.3 V typical sets ~100 m Belden 1694A threshold |
| 12, 13 (SDO / SDO) | Differential serial data output | 50 Ω internally terminated outputs deliver 750 mVP–P differential swing - compatible with SMPTE 259M/292M receiver inputs |
| 16 (CD/MUTE) | Bi-directional carrier detect/mute | Outputs high when no valid signal detected; accepts logic high to force mute or logic low to override mute - enables fail-safe video blanking |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Equalization | Real-time adjustment of gain and bandwidth based on incoming signal spectrum - maintains eye opening across temperature, voltage, and cable aging variations |
| DC Restoration | Self-biasing circuit eliminates baseline wander on pathological SMPTE color bar and sync patterns - ensures reliable clock recovery downstream |
| Programmable Mute Threshold | MUTEREF pin allows system-level tuning of mute activation point - prevents false triggering during marginal signal conditions in field-deployed gear |
| Cable Length Indicator | Monotonic analog voltage output correlated to equalizer gain setting - enables firmware-based cable diagnostics and predictive maintenance alerts |
| Form-Fit-Function Replacement | Direct drop-in replacement for Gennum GS1524/GS1524A - preserves existing PCB layout, BOM, and firmware while upgrading performance and support |
Applications
| Broadcast Camera Back-End | HD-SDI Distribution Amplifier |
|---|---|
|
Use Scenario: HD-SDI signal from camera head travels 100+ meters over coax to production switcher. IC Role / Device Role / Timing Role: Adaptive equalizer restoring high-frequency loss and DC offset in SMPTE 292M stream prior to reclocking. Use Value: Maintains >30 dB input return loss and <0.25 UI jitter at 1.485 Gbps after 140 m Belden 1694A - prevents frame drops and lip-sync errors. |
Use Scenario: One HD-SDI input distributed to 8 monitors in studio control room with varying cable lengths. IC Role / Device Role / Timing Role: Input equalizer stage in each distribution path ensuring consistent signal integrity across all outputs. Use Value: Enables simultaneous equalization of multiple paths with independent CLI feedback - simplifies calibration and reduces channel-to-channel skew. |
| OB Van Signal Aggregation | Medical Imaging Video Interface |
|
Use Scenario: Multiple camera feeds aggregated into fiber transport system with coax-to-fiber conversion. IC Role / Device Role / Timing Role: Front-end equalizer compensating for variable coax runs before E/O conversion. Use Value: CLI output fed to microcontroller for automatic gain staging - avoids manual per-channel setup during rapid equipment reconfiguration. |
Use Scenario: High-resolution endoscopic video transmitted over coax from surgical scope to display processor. IC Role / Device Role / Timing Role: Robust SDI equalizer handling intermittent signal loss during scope movement and sterilization cycles. Use Value: CD/MUTE pin asserts blanking during disconnection - prevents display artifacts and meets IEC 62304 safety requirement for visual fail-safes. |
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 | Legacy Gennum part; identical pinout and function but lacks CLI output and has higher 200 mW typical power draw | No analog cable-length feedback; requires external mute logic for carrier detection | Select GS1524A only for legacy board reuse where CLI and low-power operation are not required |
| LMH0344MA/NOPB | Texas Instruments' pin-compatible successor with enhanced jitter performance (<0.15 UI) and extended 0°C to +105°C temp range | Supports wider industrial temperature range and lower jitter-critical medical/defense systems | Choose LMH0344MA/NOPB for new designs requiring improved timing margin or extended temperature operation |
Compared with GS1524A and LMH0344MA/NOPB, the LMH0034MAX/NOPB delivers optimal balance of proven field reliability, CLI diagnostics, and cost-effective 0°C to +85°C operation - making it ideal for broadcast infrastructure where serviceability and deterministic mute behavior are prioritized over ultra-low jitter.
Availability
LMH0034MAX/NOPB is available at Aetrix Electronics and suitable for broadcast video routing, HD-SDI distribution amplifiers, and medical imaging interfaces requiring stable component supply, long-lifecycle support, and traceable sourcing for certified production programs.
Supply support for LMH0034MAX/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in high-reliability signal chain solutions.
The LMH0034MAX/NOPB belongs to TI's high-speed interface product line, engineered specifically for SMPTE-compliant serial digital video equalization in professional broadcast, medical imaging, and industrial vision systems.
FAQ
What is the primary function of the LMH0034MAX/NOPB in an SDI signal chain?
The LMH0034MAX/NOPB functions as an adaptive cable equalizer that restores high-frequency loss and DC offset in SMPTE 259M/292M/344M serial digital video signals transmitted over coaxial cable. It dynamically adjusts equalization gain and bandwidth using an AEC loop, enabling reliable reception up to 200 m of Belden 1694A at 1.485 Gbps. The LMH0034MAX/NOPB also integrates DC restoration, carrier detection, and programmable mute - making it a complete front-end solution for broadcast and medical video interfaces.
Does the LMH0034MAX/NOPB require external passive components to operate?
Yes, the LMH0034MAX/NOPB requires two key external components: a 1 µF capacitor between AEC+ and AEC− pins to set the AEC loop bandwidth, and AC-coupling capacitors (typically 1.0 µF) on the SDI input pair. Input coupling is mandatory; transformer coupling is not supported. No external termination is needed on SDO outputs due to internal 50 Ω differential termination. The LMH0034MAX/NOPB does not require external resistors or inductors for basic operation.
How does the CLI (Cable Length Indicator) output of the LMH0034MAX/NOPB behave under different cable lengths?
The CLI pin on the LMH0034MAX/NOPB outputs a monotonic DC voltage inversely proportional to the equalized cable length: 2.5 V at 0 m, decreasing to approximately 1.9 V at maximum equalization (e.g., 200 m Belden 1694A at 1.485 Gbps). This voltage is only valid when a valid input signal is present. The LMH0034MAX/NOPB's CLI response is calibrated per TI's characterization data and tracks actual equalizer gain settings - enabling firmware-based cable diagnostics and real-time health monitoring in deployed systems.
Can the LMH0034MAX/NOPB be used with single-ended input signals?
Yes, the LMH0034MAX/NOPB accepts both differential and single-ended AC-coupled inputs. For single-ended operation, one SDI pin is driven with the signal and the other is AC-coupled to ground; the internal input stage accommodates this configuration without performance degradation. Input return loss remains ≥15 dB from 5 MHz to 1.5 GHz on properly designed PCBs. Transformer coupling is explicitly unsupported, but capacitive coupling with 1.0 µF series capacitors is required for either input mode. The LMH0034MAX/NOPB's input resistance is 1.3 kΩ and input capacitance is 1 pF per pin.
Is the LMH0034MAX/NOPB pin-compatible with the Gennum GS1524 series?
Yes, the LMH0034MAX/NOPB is form-fit-function compatible with the Gennum GS1524 and GS1524A, sharing identical 16-pin SOIC (D) footprint, pin assignments, and core functionality. However, the LMH0034MAX/NOPB adds the CLI output (pin 1), improves power efficiency (208 mW → 208 mW typical, but current decreases with cable length), and enhances jitter performance. No PCB changes are required when replacing GS1524A with LMH0034MAX/NOPB, though firmware may leverage the new CLI and refined MUTEREF behavior for enhanced diagnostics.
LMH0034MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- SMPTE 292M / 259 M
- Interface:
- Serial
- Voltage - Supply:
- 3.135V ~ 3.465V
- Supplier Device Package:
- 16-SOIC
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LMH0034MAX/NOPB FAQ
1.How can I place an order for LMH0034MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0034MAX/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 LMH0034MAX/NOPB reliable?
The price and inventory of LMH0034MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0034MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH0034MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0034MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0034MAX/NOPB?
LMH0034MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0034MAX/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 LMH0034MAX/NOPB?
For technical support, including LMH0034MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0034MAX/NOPB requirements.
6.How does Aetrix verify that LMH0034MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH0034MAX/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 LMH0034MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH0034MAX/NOPB?
All LMH0034MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH0034MAX/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 LMH0034MAX/NOPB part is unused and in its original packaging.
Return procedure for LMH0034MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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