Analog Devices Inc./Maxim Integrated MAX9291GTN+

Overview

MAX9291GTN+ from Analog Devices is a 3.12Gbps GMSL serializer that converts HDMI 1.4a input to serialized video/audio/control over 50Ω coax or 100Ω STP cable up to 15m. It supports 104MHz pixel clock (1920×720p/60Hz), 192kHz/32-bit audio, and programmable 100–500mV SE / 100–400mV diff output amplitude. Used in automotive display links requiring ESD-hardened, high-bandwidth serial transmission.

For engineers reviewing the MAX9291GTN+ datasheet, MAX9291GTN+ pinout, MAX9291GTN+ application, or MAX9291GTN+ equivalent, key selection criteria include HDMI-to-GMSL conversion capability, coax/STP output flexibility, embedded control channel (UART/I2C up to 1Mbps), pre/deemphasis for long-cable integrity, and -40°C to +105°C automotive qualification.

Technical Context

The MAX9291GTN+ implements a full GMSL serializer with integrated HDMI receiver front-end including DDC, HPD, EDID support, and input equalization. Its serial link operates at selectable data rates from 1.5Gbps to 3.12Gbps, with high-bandwidth mode enabling 104MHz pixel clock and 24-bit color depth.

It features a dual-mode embedded control channel supporting UART-to-UART, UART-to-I2C, and I2C-to-I2C protocols at 9.6kbps–1Mbps, plus dedicated GPO for touch-screen interrupt signaling and PRBS generator for BER testing. Core supply is 1.8V/3.3V; I/O voltage range is 1.7V–3.6V.

Key Specifications

Availability

MAX9291GTN+ is available at Aetrix Electronics and suitable for high-resolution automotive navigation systems, rear-seat infotainment head units, and megapixel camera systems requiring stable component supply across extended temperature and EMI-prone environments.

Supply support for MAX9291GTN+ 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

Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.

The MAX9291GTN+ belongs to Analog Devices' GMSL serializer product line, designed specifically for automotive ADAS and infotainment systems requiring high-bandwidth, low-latency, ESD-hardened serial video links over cost-effective coax or STP cabling.

FAQ

What is the primary function of the MAX9291GTN+?

The MAX9291GTN+ is a GMSL serializer that converts HDMI 1.4a video/audio signals into a serialized 3.12Gbps GMSL stream for transmission over coax or STP cables. Unlike the MAX9293GTN+, the MAX9291GTN+ does not include HDCP content protection, making it suitable for non-protected display paths such as instrument clusters or backup cameras where encryption is unnecessary.

Does the MAX9291GTN+ support both coax and STP cable types?

Yes, the MAX9291GTN+ supports both 50Ω coax and 100Ω shielded twisted-pair (STP) output configurations. Output amplitude is programmable (100–500mV SE for coax; 100–400mV diff for STP), and when configured for STP, it maintains backward compatibility with legacy GMSL deserializers. Cable length support reaches 15m at full 3.12Gbps rate with enabled pre/deemphasis.

What audio formats and sample rates does the MAX9291GTN+ support?

The MAX9291GTN+ supports L-PCM audio via HDMI input or external I2S/TDM interfaces. It handles stereo I2S and up to eight-channel TDM with sample rates from 32kHz to 192kHz and sample depths up to 32 bits. This enables high-fidelity 7.1 surround sound delivery in automotive rear-seat entertainment systems using the MAX9291GTN+ as the HDMI source-side serializer.

How is the control channel implemented in the MAX9291GTN+?

The MAX9291GTN+ embeds a bidirectional control channel operating at 9.6kbps–1Mbps, supporting UART-to-UART, UART-to-I2C, and I2C-to-I2C modes. This allows a local microcontroller to read/write registers of the MAX9291GTN+ itself, remote deserializers, or peripheral devices-without disrupting video timing. Clock-stretch capability ensures reliable I2C communication even under variable load conditions.

What package type and thermal characteristics does the MAX9291GTN+ use?

The MAX9291GTN+ is housed in a lead(Pb)-free, 56-pin, 8mm × 8mm TQFN/SWTQFN package with exposed pad and 0.5mm lead pitch. Its thermal resistance θ_JA is 27.5°C/W (JEDEC standard board), enabling operation up to +105°C ambient when properly mounted on a PCB with adequate copper pour and thermal vias beneath the exposed pad-critical for automotive display module integration.