Texas Instruments TMDS141RHAR

Overview

TMDS141RHAR from Texas Instruments is a HDMI 1.3a-compliant TMDS repeater IC designed for signal integrity restoration in HDMI receiver paths. It integrates four differential TMDS receivers with 8-dB equalization (compensating ≥5-m cable loss), four compliant drivers with selectable 3.5-dB de-emphasis, and an isolated I²C repeater - all operating from a single 3.3-V supply. It enables robust 1080p/12-bit color transmission in digital TVs and AV receivers.

For engineers reviewing the TMDS141RHAR datasheet, TMDS141RHAR pinout, TMDS141RHAR application, or TMDS141RHAR equivalent, key selection criteria include its 2.25 Gbps signaling rate support, integrated 50-Ω input termination, VSADJ-controlled output voltage swing compliance, and OVS-selectable I²C output voltage level for noise margin optimization across diverse HDMI sink interfaces.

Technical Context

The TMDS141RHAR implements a full-channel TMDS signal regeneration architecture: each of the four TMDS channels includes a differential receiver with built-in 50-Ω termination and 8-dB equalization at 825 MHz, followed by a driver stage with precision-adjustable output swing via VSADJ and programmable de-emphasis via PRE. The I²C repeater features bidirectional isolation with OVS-configurable VOL (0.47–0.95 V) and 5-V tolerance on T-side pins.

Its functional block integrates independent control logic for OE (output enable), I2CEN (I²C repeater enable), and OVS (output voltage select), enabling high-impedance TMDS outputs and configurable DDC bus voltage translation without external level shifters. All TMDS inputs accept AC-coupled DisplayPort dual-mode signals and translate them to HDMI 1.3a-compliant outputs.

Key Specifications

Pinout & Package

TMDS141RHAR is housed in a 40-pin QFN package (RHA) with exposed thermal pad, RoHS-compliant and rated for 260°C reflow. Pin functions are validated per TI SLLS737D datasheet Rev. September 2011.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI TMDS repeater applications.

Compared with TMDS181RHAR and MAX3815ETM+, the TMDS141RHAR delivers optimal balance of 2.25-Gbps performance, integrated DDC isolation, and minimal external components - making it the preferred choice for mainstream 1080p HDMI receiver subsystems where BOM cost and layout simplicity are critical.

Availability

TMDS141RHAR is available at Aetrix Electronics and suitable for digital television, HDMI audio/video receiver, and DVD player applications requiring stable component supply, long-lifecycle support, and guaranteed authenticity.

Supply support for TMDS141RHAR 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 solutions, with decades of leadership in interface and signal conditioning ICs.

The TMDS141RHAR belongs to TI's HDMI interface product line, engineered specifically to solve signal integrity and DDC interoperability challenges in consumer audiovisual equipment - enabling reliable, standards-compliant HDMI connectivity without custom equalization or level-shifting circuitry.

FAQ

What is the maximum HDMI data rate supported by TMDS141RHAR?

The TMDS141RHAR supports a maximum signaling rate of 2.25 Gbps, enabling full 1080p resolution with 12-bit color depth (36 bits per pixel) and compliance with HDMI 1.3a specifications. This rate is validated across temperature (0°C to 70°C) and supply (3.0–3.6 V), with residual peak-to-peak jitter maintained below 30 ps for the clock channel under typical conditions. The TMDS141RHAR does not support HDMI 2.0 or higher rates.

How is TMDS output voltage swing configured on TMDS141RHAR?

The TMDS output voltage swing on TMDS141RHAR is set using an external precision resistor from the VSADJ pin (pin 30) to ground. A 4.64-kΩ ±1% resistor yields a compliant 800–1200 mV_p-p differential output swing into 50-Ω loads. This configuration ensures adherence to HDMI TMDS electrical specifications without trimming or calibration. Deviations from this value directly impact output amplitude and may violate HDMI compliance.

Does TMDS141RHAR require external termination resistors on TMDS inputs?

No, TMDS141RHAR does not require external termination resistors on TMDS inputs. It integrates 50-Ω differential termination resistors at each of the four TMDS receiver inputs (RX0, RX1, RX2, RXC), eliminating the need for eight external 50-Ω resistors. This integration reduces PCB area, component count, and potential impedance mismatches - confirmed in the "TMDS Inputs" section of the SLLS737D datasheet.

What is the function of the OVS pin on TMDS141RHAR?

The OVS (Output Voltage Select) pin on TMDS141RHAR configures the low-level output voltage (VOL) of the TSCL and TSDA I²C repeater outputs to optimize noise margin with downstream HDMI receivers. When OVS is floating, VOL ≈ 0.47 V; tied to GND, VOL ≈ 0.6 V; tied to VCC, VOL ≈ 0.75–0.95 V. This allows precise matching to the sink IC's VIL threshold, preventing DDC communication failures caused by marginal logic levels.

Can TMDS141RHAR translate DisplayPort dual-mode signals to HDMI?

Yes, TMDS141RHAR explicitly accepts AC-coupled DisplayPort dual-mode signals and translates them into HDMI 1.3a-compliant TMDS outputs. Its receiver front-end is designed to handle the common-mode voltage and swing characteristics of DP++ sources, enabling interoperability in hybrid-source devices such as laptops or docking stations with shared physical connectors. This capability is documented in the "Features" and "Description" sections of the SLLS737D datasheet.