Analog Devices Inc./Maxim Integrated MAX459CQH+

Overview

MAX459CQH+ from Maxim Integrated is an 8×4 video crosspoint switch IC with integrated gain-of-two buffered outputs, designed for high-fidelity analog video routing in professional broadcast and security systems. It supports 100MHz bandwidth, 300V/µs slew rate, and drives 75Ω coaxial cables directly-enabling clean switching of composite, S-video, or component video signals without external amplification.

For engineers reviewing the MAX459CQH+ datasheet, MAX459CQH+ pinout, MAX459CQH+ application, or MAX459CQH+ equivalent, key selection considerations include its dual serial (SPI/QSPI/Microwire) and parallel (6-bit address) interface modes, individual amplifier shutdown capability, differential phase/gain error performance (<0.05° / <0.01%), and PLCC-44 package compatibility with legacy video infrastructure designs.

Technical Context

The MAX459CQH+ implements a fully decoded 8-input × 4-output analog switch matrix with four independent high-speed op-amp output buffers, each configured for AV = 2. Its analog section uses make-before-break switching to minimize transient glitches during channel changes, while maintaining high input impedance (>500kΩ) and low input capacitance (7pF) to avoid loading source signals.

Digital control is implemented via two register banks: transparent/latched input registers (addressed by A0/A1 and written via D0–D3) and switch registers updated synchronously on the falling edge of UPDATE. This architecture enables simultaneous reconfiguration of all four outputs without intermediate signal disruption.

Key Specifications

Pinout & Package

The MAX459CQH+ is housed in a 44-pin plastic leaded chip carrier (PLCC) package with J-lead geometry, rated for 0°C to +70°C operation. The package provides robust thermal performance (1067mW max dissipation) and low-inductance grounding via 10 dedicated GND pins strategically distributed to minimize crosstalk.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video crosspoint switching applications.

Compared with MAX458CQH+, the MAX459CQH+ provides +6dB gain per output but trades 100V/µs lower slew rate; versus AD8170ARZ, it offers simpler control and integrated drive at the cost of channel density and bandwidth-making it optimal for cost-sensitive SD/analog video systems.

Availability

MAX459CQH+ is available at Aetrix Electronics and suitable for video test equipment, CCTV security systems, and broadcast infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for MAX459CQH+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX458/MAX459 product line was engineered specifically for high-fidelity analog video signal routing in broadcast, security, and professional A/V equipment-emphasizing low crosstalk, precise gain accuracy, and robust 75Ω drive capability.

FAQ

What is the operating temperature range for the MAX459CQH+?

The MAX459CQH+ is specified for commercial temperature operation from 0°C to +70°C. This range aligns with typical environmental conditions found in indoor video equipment enclosures, studio racks, and security monitoring centers. The device's PLCC-44 package provides adequate thermal dissipation within this range under normal load conditions, and derating guidelines (13mW/°C above +70°C) are provided in the datasheet for margin analysis.

Does the MAX459CQH+ support both serial and parallel control interfaces?

Yes, the MAX459CQH+ supports dual-mode digital control: a 6-bit parallel interface using address bits A0/A1 and data bits D0–D3, and a 16-bit serial interface compatible with SPI, QSPI, and Microwire protocols. In parallel mode, CE, WR, and UPDATE pins coordinate register updates; in serial mode, CS, SCLK, DIN, and DOUT handle data transfer. The MAX459CQH+ automatically detects mode based on logic levels applied to CE, WR, UPDATE, and CS.

How does the MAX459CQH+ handle power-up sequencing and output state initialization?

On power-up, the MAX459CQH+ defaults all output amplifiers to the disabled (high-impedance) state if CS and UPDATE are held high-a built-in safety feature preventing bus contention in multi-device arrays. This behavior is independent of the SHDN pin state. Once powered, the device retains its last programmed configuration until explicitly reconfigured, and the input registers remain functional even during shutdown, allowing pre-programming before activation.

Can the MAX459CQH+ drive 75Ω coaxial cables directly without external components?

Yes, the MAX459CQH+ is explicitly characterized to drive 75Ω loads directly, including back-terminated coaxial cables up to 100pF total capacitance. Its output buffers deliver full swing (±2V) into 75Ω with guaranteed differential phase/gain error performance. No series resistors or external amplifiers are required for standard SDTV video routing, though isolation resistors may be added for capacitive loads exceeding 100pF.

What is the significance of the "Not Recommended for New Designs" status for MAX459CQH+?

The "Not Recommended for New Designs" designation for MAX459CQH+ reflects that Maxim discontinued the wafer process used to manufacture this part; it is no longer produced but remains supported for existing designs. Aetrix Electronics maintains inventory and provides lifecycle coordination-including obsolescence forecasting, last-time-buy planning, and technical documentation-to support ongoing production and maintenance of legacy video systems relying on MAX459CQH+.