Analog Devices Inc./Maxim Integrated MAX9539EUI+

Overview

MAX9539EUI+ from Maxim Integrated is a video sync adder IC that converts 5-wire RGBHV graphics signals into a 3-wire RGB interface by embedding horizontal and vertical sync pulses into red, green, and blue video channels. It features 180MHz large-signal bandwidth, ±1mV output offset voltage, DC-restore functionality for black-level stability, and operates over –40°C to +85°C in enterprise KVM and blade-server video routing applications.

For engineers reviewing the MAX9539EUI+ datasheet, MAX9539EUI+ pinout, MAX9539EUI+ application, or MAX9539EUI+ equivalent, key selection criteria include sync-addition timing skew (<1ns), DC-restore input range (±0.3V), composite sync generation capability, and TSSOP-28 package compatibility with high-resolution VGA-to-UXGA (1600×1200@85Hz) signal paths.

Technical Context

The MAX9539EUI+ implements a proprietary true-sync addition scheme where HSYNC is embedded into the red channel, VSYNC into the blue channel, and internally generated composite sync (XOR of H/V) into the green channel. All three outputs are level-shifted to –2.4V sync amplitude with precise timing alignment.

Its bipolar process enables 180MHz large-signal bandwidth and 900V/µs slew rate while maintaining <0.02% gain linearity and –60dB channel-to-channel crosstalk at 10MHz - critical for preserving RGB color fidelity during sync injection without introducing inter-channel timing skew or amplitude mismatch.

Key Specifications

Pinout & Package

MAX9539EUI+ is housed in a 28-pin TSSOP (U28-3) package with 0.65mm pitch, 4.4mm body width, and exposed thermal pad (not electrically connected). Pin 19 (VEE) and pin 24 (VCC) require local 0.1µF ceramic bypassing; pins 3/8/13 (REST_R/G/B) each require 1nF to GND for DC-restore hold capacitor function.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video sync addition applications.

Compared with MAX9540EUI+, the MAX9539EUI+ provides unique sync-addition functionality essential for upstream video conditioning, while THS7353IPWPR offers broader gain flexibility but lacks the integrated timing-critical true-sync engine and DC-restore precision needed for UXGA KVM systems.

Availability

MAX9539EUI+ is available at Aetrix Electronics and suitable for enterprise blade servers, laptop docking stations, and KVM extenders requiring stable component supply with guaranteed lead-free compliance and extended temperature operation.

Supply support for MAX9539EUI+ 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.

The MAX9539EUI+ belongs to Maxim's graphics interface product line, engineered specifically for timing-critical analog video signal conditioning in high-density computing infrastructure where sync integrity and black-level stability are non-negotiable.

FAQ

What is the primary function of the MAX9539EUI+ in a video signal chain?

The MAX9539EUI+ is a dedicated sync adder IC that embeds horizontal and vertical synchronization pulses into RGB video signals to convert a 5-wire RGBHV interface into a compact 3-wire RGB format. It performs this function while maintaining sub-nanosecond inter-channel timing alignment and DC-restore–stabilized black levels - making it essential for high-fidelity video routing in blade servers and KVM systems. The MAX9539EUI+ achieves this using proprietary true-sync logic and internal composite sync generation.

Does the MAX9539EUI+ support both positive and negative sync polarity inputs?

Yes, the MAX9539EUI+ supports configurable sync polarity through dedicated SP_V (pin 17) and SP_H (pin 27) inputs. Driving either pin high selects positive sync (idle low, pulse high), while driving it low selects negative sync (idle high, pulse low). This eliminates the need for external inverters or level shifters when interfacing with diverse graphics controllers or monitors. The MAX9539EUI+ uses these inputs to correctly interpret and embed sync timing regardless of source polarity.

What external components are required for proper DC-restore operation of the MAX9539EUI+?

The MAX9539EUI+ requires three 1nF ceramic capacitors - one each connected from pins 3 (REST_R), 8 (REST_G), and 13 (REST_B) to ground - to enable its DC-restore function. These capacitors stabilize the black level at the back porch of each horizontal sync period. Using values outside 0.5–2nF risks AC instability or excessive settling time. Additionally, 0.1µF ceramic bypass capacitors must be placed close to pins 19 (VEE) and 24 (VCC), and a 10µF bulk capacitor is recommended at the board's power entry point for optimal noise rejection in the MAX9539EUI+'s analog signal path.

Can the MAX9539EUI+ be used without the MAX9540EUI+ in a complete system?

Yes, the MAX9539EUI+ operates independently as a standalone sync adder and does not require the MAX9540EUI+ to function. It is commonly deployed in transmitter-side applications such as blade server video consolidation or laptop docking stations where 3-wire video output must be generated. The MAX9540EUI+ is only needed on the receiver side to extract sync and reconstruct RGBHV. System architects may use MAX9539EUI+ alone when interfacing with displays or receivers that natively accept embedded sync, or when paired with third-party extraction solutions.

What is the maximum supported video resolution and refresh rate for the MAX9539EUI+?

The MAX9539EUI+ supports display resolutions up to 1600×1200 at 85Hz (UXGA), validated by its 180MHz large-signal bandwidth and 900V/µs slew rate. This performance envelope covers all standard VGA, SVGA, XGA, SXGA, and UXGA timings, including those used in enterprise-class KVM and blade-server video applications. The MAX9539EUI+ maintains <0.02% gain linearity and <1ns channel-to-channel skew across this full bandwidth, ensuring pixel-perfect timing integrity without visible artifacts.