Analog Devices Inc./Maxim Integrated MAX9281GTM/V+T

Overview

The MAX9281GTM/V+T from Maxim Integrated is a 3.12Gbps GMSL serializer with LVDS input (3- or 4-lane oLDI), CML serial output programmable for 50Ω coax or 100Ω STP, HDCP content protection, −40°C to +105°C operation, and 48-pin TQFN package. It enables high-resolution automotive video links such as 1920×720p/60Hz displays with 24-bit color.

For engineers reviewing the MAX9281GTM/V+T datasheet, MAX9281GTM/V+T pinout, MAX9281GTM/V+T application, or MAX9281GTM/V+T equivalent, key selection criteria include coax/STP drive capability, HDCP support, audio channel configuration (I²S/TDM up to 192kHz/32-bit), control channel UART/I²C modes, and pre/deemphasis programming for 15m cable reach at full speed.

Technical Context

The MAX9281GTM/V+T implements a jitter-filtering PLL that attenuates pixel clock jitter and tracks spread spectrum on input. Its embedded reverse control channel operates at 9.6kbps–1Mbps in UART-UART, UART-I²C, or I²C-I²C modes with clock stretch capability and high-immunity mode for noise rejection.

It supports dual-mode serial output: single-ended (100–500mV) for coax/FAKRA and differential (100–400mV) for STP, with programmable pre/deemphasis and spread spectrum to meet ISO 10605 and IEC 61000-4-2 ESD standards. Core supply is 1.7–1.9V; I/O supply is 1.7–3.6V.

Key Specifications

Pinout & Package

The MAX9281GTM/V+T is housed in a lead-free, 48-pin, 7mm × 7mm TQFN package with exposed thermal pad and 0.5mm pitch; optional wettable flanks support automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GMSL serializer applications.

Compared with MAX9277GTM/V+ and DS90UB953-Q1, the MAX9281GTM/V+ uniquely combines HDCP 1.4, STP/coax dual-drive flexibility, integrated PRBS testing, and high-immunity reverse control-making it optimal for secure, long-cable automotive video systems requiring field-verifiable link integrity.

Availability

MAX9281GTM/V+T is available at Aetrix Electronics and suitable for high-resolution automotive navigation, rear-seat infotainment, and megapixel camera systems requiring stable component supply across extended temperature and ESD stress conditions.

Supply support for MAX9281GTM/V+T 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

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX9281GTM/V+T belongs to Maxim's GMSL serializer product line, engineered specifically for high-reliability, high-bandwidth video and audio transport in automotive ADAS and infotainment systems with stringent EMC and functional safety requirements.

FAQ

What is the primary function of the MAX9281GTM/V+T in an automotive video system?

The MAX9281GTM/V+T serves as a Gigabit Multimedia Serial Link (GMSL) serializer that converts parallel LVDS video and audio signals into a high-speed serial stream for transmission over coax or STP cables. It integrates HDCP 1.4 encryption, supports up to 3.12Gbps data rates, and enables robust, long-cable video links in automotive navigation, rear-seat displays, and camera systems - all while operating reliably from −40°C to +105°C.

Does the MAX9281GTM/V+T support both coaxial and shielded twisted pair (STP) cabling?

Yes, the MAX9281GTM/V+T supports both cabling types via programmable CML output: single-ended mode (100–500mV) for 50Ω coax/FAKRA connectors and differential mode (100–400mV) for 100Ω STP. This dual-drive capability allows system designers to select cost-optimized or EMI-robust physical layers without changing the MAX9281GTM/V+T silicon or firmware.

How does the MAX9281GTM/V+T handle audio transport alongside video?

The MAX9281GTM/V+T embeds an audio channel supporting L-PCM I²S stereo or up to 8-channel TDM with sample rates from 32kHz to 192kHz and sample depths up to 32 bits. Audio is time-multiplexed into the same serial stream as video, eliminating separate audio cabling. The MAX9281GTM/V+T also provides WS/SCK inversion and frame-sync capability for precise timing alignment with camera sensors.

What role does the reverse control channel play in the MAX9281GTM/V+T?

The reverse control channel in the MAX9281GTM/V+T operates at 9.6kbps–1Mbps in UART-UART, UART-I²C, or I²C-I²C modes and allows a local µC to program serializer, deserializer, and peripheral registers at any time - independent of video timing. It supports clock stretching, high-immunity mode for noise rejection, and is essential for HDCP authentication, register-level diagnostics, and real-time link management in the MAX9281GTM/V+T.

Is the MAX9281GTM/V+T pin-compatible with the MAX9277GTM/V+?

Yes, the MAX9281GTM/V+T is pin-compatible with the MAX9277GTM/V+. Both share identical 48-pin TQFN packaging, pin assignments, power domains, and functional interfaces. The sole functional difference is HDCP 1.4 support in the MAX9281GTM/V+T; all other electrical characteristics, timing parameters, and register maps are identical - enabling drop-in replacement where content protection is required.