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Texas Instruments LMH0324RTWT
- Part No.:
- LMH0324RTWT
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMH0324RTWT.pdf
- Description:
- IC INTERFACE SPECIALIZED 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:668
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Product details
Overview
LMH0324RTWT from Texas Instruments is a low-power, dual-output adaptive cable equalizer for SMPTE 3G/HD/SD-SDI video transport over 75-Ω coaxial cable. It supports data rates from 125 Mbps to 2.97 Gbps, delivers up to 600 m reach on Belden 1694A at 270 Mbps, consumes only 78 mW (typ) at 1.8 V, and integrates 75-Ω input termination with return loss compensation. It is deployed in broadcast video routers and distribution amplifiers to restore degraded serial digital video signals.
For engineers reviewing the LMH0324RTWT datasheet, LMH0324RTWT pinout, LMH0324RTWT application, or LMH0324RTWT equivalent, key selection considerations include its adaptive equalization architecture, dual 100-Ω differential output drivers with programmable de-emphasis, carrier detect (CD_N) open-drain output, 4-level control pin logic, and support for both SPI and SMBus configuration - all in a compact 4 mm × 4 mm QFN package.
Technical Context
The LMH0324RTWT implements an analog adaptive equalization loop that continuously monitors input signal integrity (e.g., jitter, amplitude decay) and dynamically adjusts high-frequency gain to compensate for coaxial cable loss. Its equalizer operates across three SMPTE tiers - SD (270 Mbps), HD (1.485 Gbps), and 3G (2.97 Gbps) - with adaptation time under 5 ms after signal detection.
It features two independent differential output drivers (OUT0±, OUT1±), each with 100-Ω internal termination and selectable output amplitude/de-emphasis via VOD_DE (4-level pin or register). Carrier detection (CD_N) provides open-drain status signaling, while power management enables automatic entry into 15 mW power-save mode when no valid input signal is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 125 Mbps to 2.97 Gbps - covers full SMPTE ST-259/ST-292/ST-424 and DVB-ASI standards. |
| Cable Reach (Belden 1694A) | 200 m @ 2.97 Gbps - enables long-haul 3G-SDI routing without repeaters. |
| Power Consumption | 78 mW typical @ 1.8 V, 2.97 Gbps, single output enabled - reduces thermal load in dense video chassis. |
| Input Termination | 75 Ω single-ended with integrated return loss network - meets SMPTE ST-297 AC return loss spec without external components. |
| Output Drivers | Dual 100 Ω differential drivers with programmable de-emphasis - compensates PCB trace loss before downstream receivers. |
| Supply Options | Single 1.8 V or 2.5 V supply - simplifies power rail design; VDDIO and VIN may be independently set. |
| Control Interface | SPI or SMBus (configurable via MODE_SEL) - enables dynamic reconfiguration in field-upgradable systems. |
Pinout & Package
LMH0324RTWT is housed in a 24-pin QFN package (RTW) with 4.00 mm × 4.00 mm body size and exposed thermal pad (EP = VSS). The package supports standard reflow profiles and requires ground via array under EP for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+, IN0− | High-speed differential input | 75 Ω internally terminated analog inputs for SDI signal; require external 4.7 µF AC coupling caps. |
| OUT0+, OUT0− OUT1+, OUT1− |
Differential outputs | 100 Ω internally terminated drivers; each pair can be independently powered down via control pins or registers. |
| CD_N | Carrier detect output | Open-drain LVCMOS output pulled LOW after successful signal adaptation; 3.3 V tolerant when VDDIO = 2.5 V. |
| VOD_DE | 4-level control input | Selects driver output amplitude (410–810 mVp-p) and de-emphasis level (0–7 dB) for both outputs simultaneously. |
| MODE_SEL | Interface mode select | Configures serial interface: LEVEL-F = SPI, LEVEL-L = SMBus; overrides strap-based address selection in SMBus mode. |
| IN_OUT_SEL, OUT_CTRL | Signal path control | Set input-to-output routing (bypass/equalized) and fan-out mode (splitter vs. direct); configurable by pin or register. |
| VIN, VDDIO, VDD_LDO | Power supplies | VIN accepts 1.8 V or 2.5 V; VDDIO powers I/O logic; VDD_LDO is LDO output (1.8 V) when VIN = 2.5 V, or input when VIN = 1.8 V. |
| SS_N / ADDR0 MISO / ADDR1 MOSI / SDA SCK / SCL |
Serial interface pins | Shared pin functions: SPI (SS_N/MISO/MOSI/SCK) or SMBus (ADDR0/ADDR1/SDA/SCL); SMBus pins are 3.3 V tolerant. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive equalization | Real-time adjustment of high-frequency boost based on input signal quality - maintains bit-error-free operation across varying cable lengths and launch amplitudes. |
| Dual independent output drivers | Two 100 Ω differential outputs with per-output power-down control - enables flexible fan-out buffering without external splitters. |
| Programmable de-emphasis | Up to 7 dB de-emphasis selectable via VOD_DE pin or register - mitigates inter-symbol interference from board-level transmission lines. |
| Integrated carrier detect | CD_N open-drain output asserts LOW after adaptation completes - provides system-level signal presence indication for status LEDs or microcontroller polling. |
| Low-power operation | 15 mW power-save mode activated automatically when no input signal detected - reduces standby power in always-on broadcast infrastructure. |
| 4-level logic control interface | Four discrete voltage thresholds (LEVEL-H/F/R/L) on control pins - enables robust hardware configuration without external level shifters or voltage dividers. |
Applications
| Broadcast Video Router | Distribution Amplifier |
|---|---|
|
Use Scenario: Signal distribution from central source to multiple monitoring stations over long coax runs in OB vans or control rooms. IC Role / Device Role / Timing Role: Adaptive equalizer restoring degraded 3G-SDI signals after 150–200 m Belden 1694A transmission. Use Value: Enables error-free 1080p60 video transport without intermediate reclocking, reducing latency and system complexity. |
Use Scenario: Fan-out of a single SDI source to multiple downstream devices (switchers, recorders, displays) with matched output drive strength. IC Role / Device Role / Timing Role: Dual-output buffer with independent output enable/disable and programmable de-emphasis. Use Value: Eliminates need for passive splitters and external drivers, preserving signal integrity and simplifying layout. |
| Video Production Switcher | DVB-ASI Transport Node |
|
Use Scenario: Input conditioning stage in multi-channel SDI switchers where variable cable lengths cause inconsistent signal degradation. IC Role / Device Role / Timing Role: Adaptive equalizer with fast (<5 ms) adaptation and carrier detect feedback for auto-sensing input sources. Use Value: Ensures consistent input signal quality across all channels regardless of source distance, improving switching reliability. |
Use Scenario: Reconditioning DVB-ASI signals in headend equipment after long-distance coax distribution. IC Role / Device Role / Timing Role: Cable equalizer supporting 270 Mbps DVB-ASI with 600 m reach on Belden 1694A. Use Value: Extends usable cable length beyond legacy fixed-gain equalizers, lowering infrastructure cost per node. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adaptive SDI equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH0384RTWT | 12-Gbps adaptive equalizer with integrated reclocker; pin-compatible but higher bandwidth and power (190 mW). | Required for UHD/4K (12G-SDI) transport; not suitable for pure 3G-SDI cost-sensitive designs. | Select LMH0384RTWT only when upgrading to 12G-SDI infrastructure; LMH0324RTWT remains optimal for 3G/HD/SD systems. |
| GS2971-IBE3 | 3G-SDI equalizer with integrated CDR; supports SMPTE ST 424/292/259 but lacks dual outputs and programmable de-emphasis. | Used in reclocking applications where jitter cleanup is mandatory; less flexible for fan-out-only use cases. | Choose GS2971-IBE3 when deterministic jitter reduction is required; LMH0324RTWT preferred when minimal latency and fan-out flexibility are priorities. |
Compared with LMH0324RTWT, LMH0384RTWT offers higher data rate support and integrated reclocking at increased power and cost, while GS2971-IBE3 provides jitter cleanup but sacrifices output flexibility and de-emphasis control - making LMH0324RTWT the optimal balance of reach, power, and configurability for 3G-SDI distribution.
Availability
LMH0324RTWT is available at Aetrix Electronics and suitable for broadcast video routers, distribution amplifiers, and video production switchers requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for industrial deployment.
Supply support for LMH0324RTWT 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 and embedded processing technologies, with deep expertise in high-speed signal conditioning and video interface solutions.
The LMH0324RTWT belongs to TI's LMH high-speed video interface product line, engineered specifically for SMPTE-compliant serial digital video transport in broadcast, professional AV, and digital signage infrastructure.
FAQ
What data rates does the LMH0324RTWT support?
The LMH0324RTWT supports serial digital video data rates from 125 Mbps to 2.97 Gbps, fully covering SMPTE ST-259 (SD), ST-292 (HD), and ST-424 (3G) standards, as well as DVB-ASI and AES10 (MADI) protocols. It adapts automatically to each rate without external configuration changes, and its equalization performance is validated across this entire range using Belden 1694A coaxial cable.
How does the LMH0324RTWT achieve low power consumption?
The LMH0324RTWT achieves low power consumption through architectural optimizations including adaptive biasing, clock gating during idle periods, and automatic entry into 15 mW power-save mode when no input signal is detected. At 1.8 V supply and 2.97 Gbps with one output enabled, it draws only 78 mW typical - significantly lower than legacy fixed-gain equalizers - enabling denser channel packing in thermal-constrained video chassis.
Can the LMH0324RTWT be configured without a microcontroller?
Yes, the LMH0324RTWT supports full hardware configuration via its 4-level control pins (VOD_DE, IN_OUT_SEL, OUT_CTRL, MODE_SEL), eliminating the need for firmware or serial interface initialization. Each pin accepts four discrete voltage states (LEVEL-H/F/R/L) using simple resistor straps, allowing complete setup - including output amplitude, de-emphasis, signal routing, and interface selection - at power-up without software intervention.
What is the function of the CD_N pin on the LMH0324RTWT?
The CD_N pin on the LMH0324RTWT is an open-drain carrier detect output that transitions LOW after successful signal acquisition and equalizer adaptation. It remains HIGH when no valid input signal is present, triggering automatic entry into power-save mode. CD_N is 3.3 V tolerant when VDDIO = 2.5 V and can directly drive status LEDs or microcontroller GPIOs with a pull-up resistor, providing real-time signal presence feedback in broadcast systems.
Does the LMH0324RTWT require external termination resistors?
No, the LMH0324RTWT integrates all critical terminations on-die: 75 Ω single-ended input termination with return loss compensation network on IN0±, and 100 Ω differential termination on each output pair (OUT0±, OUT1±). External components required are only 4.7 µF AC coupling capacitors on all high-speed I/Os and bypass capacitors (1 µF + 0.1 µF) on VDD_LDO - no external termination resistors are needed for compliant SMPTE operation.
LMH0324RTWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Cable Equalization
- Interface:
- Serial
- Voltage - Supply:
- -
- Supplier Device Package:
- 24-WQFN (4x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LMH0324RTWT FAQ
1.How can I place an order for LMH0324RTWT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH0324RTWT 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 LMH0324RTWT reliable?
The price and inventory of LMH0324RTWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH0324RTWT is usually 5 days.
3.What payment methods are accepted for LMH0324RTWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH0324RTWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH0324RTWT?
LMH0324RTWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH0324RTWT 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 LMH0324RTWT?
For technical support, including LMH0324RTWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH0324RTWT requirements.
6.How does Aetrix verify that LMH0324RTWT is sourced from the original manufacturer or authorized distributors?
All LMH0324RTWT 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 LMH0324RTWT meets industry standards.
7.What is the process for return or replacement of LMH0324RTWT?
All LMH0324RTWT units undergo pre-shipment inspection (PSI). If there is an issue with LMH0324RTWT, 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 LMH0324RTWT part is unused and in its original packaging.
Return procedure for LMH0324RTWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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