Analog Devices Inc./Maxim Integrated MAX9248ECM/V+

Overview

MAX9248ECM/V+ from Maxim Integrated is a 27-bit DC-balanced LVDS deserializer IC for automotive and industrial video interfaces, converting serial LVDS input (5–42 MHz) into 18-bit RGB video + 9-bit control parallel outputs. It features ±2% or ±4% programmable spread-spectrum clocking, ISO 10605 ±10kV contact ESD protection, and operates from +3.3V core supply with separate 1.8V–3.3V output supply - deployed in navigation display systems requiring robust EMI suppression and AC-coupled isolation.

For engineers reviewing the MAX9248ECM/V+ datasheet, MAX9248ECM/V+ pinout, MAX9248ECM/V+ application, or MAX9248ECM/V+ equivalent, key selection criteria include spread-spectrum configuration (SS pin), latch-edge polarity (R/F), frequency range programming (RNG[1:0]), and compatibility with MAX9247 serializer in high-noise in-vehicle environments.

Technical Context

The MAX9248ECM/V+ implements a dual-phase deserialization architecture: video data (RGB_OUT[17:0]) is latched during active DE_OUT high periods, while control data (CNTL_OUT[8:0]) is recovered during blanking intervals when DE_OUT is low. Its proprietary DC-balanced encoding enables AC-coupling across long cables without ground shift issues.

A dedicated SSPLL locks to REFCLK first, then synchronizes to the incoming LVDS stream; lock time is up to 33,600 REFCLK cycles. Output transition timing scales with operating frequency (via RNG[1:0]), and RGB outputs are staggered in three 6-bit groups to minimize simultaneous switching noise.

Key Specifications

Pinout & Package

MAX9248ECM/V+ is housed in a 48-lead LQFP package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are electrically and physically identical to MAX9248ECM; /V+ suffix denotes lead-free, RoHS-compliant, and automotive-grade qualification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9250ECM/V+, MAX9248ECM/V+ prioritizes EMI suppression over bus flexibility; versus DS90UB928QSQ, it delivers lower BOM cost and simpler clocking (no external crystal) at the expense of resolution ceiling and cable length.

Availability

MAX9248ECM/V+ is available at Aetrix Electronics and suitable for navigation system displays, in-vehicle entertainment systems, and automotive video cameras requiring stable component supply across extended temperature and high-reliability automotive programs.

Supply support for MAX9248ECM/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 - emphasizing robustness, integration, and AEC-Q100 compliance.

The MAX9248 product line targets high-speed digital video transmission in harsh EMI environments, delivering DC-balanced deserialization with spread-spectrum clocking to meet automotive EMC standards without external filtering.

FAQ

What is the function of the SS pin on the MAX9248ECM/V+?

The SS pin on the MAX9248ECM/V+ selects spread-spectrum deviation: high = ±4%, low = ±2% around REFCLK. This setting directly modulates PCLK_OUT and all data outputs to reduce EMI peaks. Changing SS state triggers a 32,800×tT delay before valid outputs resume - design must hold SS stable during normal operation.

Does the MAX9248ECM/V+ require an external crystal or oscillator?

No, the MAX9248ECM/V+ does not require an external crystal. It uses the REFCLK input (LVTTL/LVCMOS, ±2% tolerance) for initial PLL lock and subsequent synchronization to the LVDS serial stream. REFCLK can be sourced from the host MCU or system clock generator - no crystal or oscillator component is needed on the deserializer side.

How does the MAX9248ECM/V+ handle loss of LVDS signal?

When the LVDS input stops toggling, the MAX9248ECM/V+ asserts LOCK high, drives all outputs (except LOCK) low, and outputs REFCLK on PCLK_OUT. It continuously monitors for a transition word; upon detection, LOCK goes low and PCLK_OUT switches to the recovered clock - enabling automatic re-synchronization without system reset.

Can the MAX9248ECM/V+ interface directly with a 1.8V FPGA I/O bank?

Yes, the MAX9248ECM/V+ supports direct 1.8V interfacing via its VCCO pin. When VCCO = 1.8V, RGB_OUT[17:0], CNTL_OUT[8:0], DE_OUT, PCLK_OUT, and LOCK drive LVTTL/LVCMOS levels compatible with 1.8V FPGA I/O - eliminating level shifters and reducing board area and BOM cost.

What is the purpose of the RNG[1:0] pins on the MAX9248ECM/V+?

The RNG[1:0] pins configure the MAX9248ECM/V+ for specific frequency bands (5–10, 10–20, or 20–42 MHz) and set corresponding output transition times. This ensures optimal PLL stability and minimized jitter at the target data rate - incorrect RNG settings cause failed lock or excessive output skew.