Analog Devices Inc./Maxim Integrated MAX9247GCM/V+

Overview

The MAX9247GCM/V+ from Maxim Integrated is an automotive-qualified 27-bit DC-balanced LVDS serializer that converts 18-bit RGB video and 9-bit control data into a single high-speed serial stream for transmission over twisted-pair or controlled-impedance PCB traces. It operates at 2.5MHz–42MHz parallel clock frequencies, features integrated 100Ω LVDS termination, preemphasis-enabled signal integrity up to 42MHz, and supports AC-coupled isolation in in-vehicle display links.

For engineers reviewing the MAX9247GCM/V+ datasheet, MAX9247GCM/V+ pinout, MAX9247GCM/V+ application, or MAX9247GCM/V+ equivalent, this page delivers verified technical context, real-world timing constraints, validated pin functions, automotive-grade ESD performance (±10kV contact per ISO 10605), and precise substitution guidance for navigation system and IVI video interface design.

Technical Context

The MAX9247GCM/V+ implements a proprietary DC-balanced encoding scheme that embeds 2 overhead bits (EN0/EN1) in 20-bit video words and 1 overhead bit in 19-bit control words, enabling AC-coupling and reducing EMI. Its PLL locks to PCLK_IN with 17,100-cycle lock time and tolerates ±2% reference clock variation.

It supports dual supply domains: VCCIN (1.71V–3.6V) for LVTTL/LVCMOS inputs and +3.3V core (VCC/VCCPLL/VCCLVDS) for internal logic, PLL, and LVDS output stages. Preemphasis (enabled via PRE pin) boosts transition amplitude by 40–50% for improved eye opening on STP cables up to 10m.

Key Specifications

Pinout & Package

The MAX9247GCM/V+ is housed in a 48-lead LQFP package (7mm × 7mm, 0.5mm pitch) with exposed pad for thermal dissipation. Pin assignments are fully validated per Maxim's official pin description table and functional diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9247ECM/V+, the MAX9247GCM/V+ adds guaranteed operation up to +105°C and automotive qualification evidence, while the MAX9275GTJ+ trades pin-level control flexibility for compact size and integrated EMI mitigation - making each optimal for distinct thermal, layout, and system architecture constraints.

Availability

The MAX9247GCM/V+ is available at Aetrix Electronics and suitable for automotive navigation displays, in-vehicle entertainment systems, and digital instrument clusters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX9247GCM/V+ 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 MAX9247GCM/V+ belongs to Maxim's automotive-qualified GMSL-adjacent serializer family, engineered specifically for high-reliability, ESD-hardened digital video transport in vehicles - emphasizing DC balance, cable drive, and deterministic timing.

FAQ

What is the maximum supported cable length for MAX9247GCM/V+ at 42MHz?

The MAX9247GCM/V+ achieves bit-error rate <10⁻¹² up to 10m on CAT5 cable at 42MHz (840Mbps). Performance depends on cable quality and termination: shielded twisted-pair with 100Ω differential impedance and proper CMF capacitor (0.1µF) is required. Beyond 10m, signal integrity degrades due to attenuation and jitter accumulation - verify with eye diagram testing at receiver.

Does MAX9247GCM/V+ require external LVDS termination resistors?

No. The MAX9247GCM/V+ integrates a matched 100Ω differential termination resistor between OUT+ and OUT−. This eliminates external components, ensures consistent impedance across temperature (-40°C to +105°C), and simplifies PCB layout. External termination is only needed if driving non-standard loads or using custom equalization networks.

How does the RNG[1:0] pin configuration affect MAX9247GCM/V+ operation?

RNG[1:0] selects one of four parallel clock frequency bands (2.5–5MHz, 5–10MHz, 10–20MHz, or 20–42MHz). Incorrect setting causes PLL unlock or failure to serialize - e.g., RNG=11 is mandatory for 42MHz PCLK_IN. The setting must match actual clock frequency before power-up; dynamic changes during operation are not supported.

Can MAX9247GCM/V+ interface directly with 1.8V logic without level shifters?

Yes. The VCCIN pin accepts 1.71V–3.6V, allowing direct connection to 1.8V, 2.5V, or 3.3V logic families. Input thresholds scale with VCCIN (VIH = 0.65×VCCIN min), ensuring reliable sampling of 1.8V signals. No external level translation is needed for RGB_IN, CNTL_IN, DE_IN, or PCLK_IN.

What is the purpose of the CMF pin on MAX9247GCM/V+?

The CMF pin connects to the midpoint of the internal 100Ω LVDS termination (two 50Ω resistors in series). Adding a capacitor (e.g., 0.1µF) from CMF to LVDSGND shunts high-frequency common-mode noise to ground, reducing radiated EMI by up to 6dB in the 100–500MHz band - critical for passing CISPR 25 automotive emissions tests.