Analog Devices Inc./Maxim Integrated DG508ADJ+

Overview

DG508ADJ+ from Maxim Integrated is a monolithic CMOS 8-channel single-ended analog multiplexer with break-before-make switching, ±4.5V to ±18V dual-supply operation, 400Ω typical on-resistance at ±15V, <1nA off-leakage at ±10V, and -40°C to +85°C temperature range in 16-pin plastic DIP package. It routes analog signals in data-acquisition systems requiring rail-to-rail signal handling and low-power standby operation.

For engineers reviewing the DG508ADJ+ datasheet, DG508ADJ+ pinout, DG508ADJ+ application, or DG508ADJ+ equivalent, key selection criteria include guaranteed latchup immunity with powered-off supplies, symmetrical bidirectional analog paths, TTL/CMOS-compatible logic inputs, and plug-in compatibility with legacy DG508A designs while delivering lower leakage and faster enable timing.

Technical Context

The DG508ADJ+ implements a fully decoded 3-bit address (A0–A2) to select one of eight bidirectional analog channels (S1–S8) to a common drain (D), with independent enable (EN) control. Its CMOS architecture ensures symmetrical conduction and low charge injection (<10pC).

Break-before-make timing is guaranteed at ≤0.2μs, preventing momentary shorting during channel transitions. The device operates across full ±4.5V to ±18V supply ranges without performance degradation, and remains functional when input signals persist during power-down - a critical feature for fault-tolerant industrial signal routing.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (PDIP), RoHS-compliant (indicated by '+' suffix), 0.3-inch width, through-hole mountable.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with DG508ADJ+, MAX338CPD+ offers lower supply voltage flexibility but sacrifices high-voltage robustness, while ADG508AKRZ-REEL7 provides surface-mount convenience at the cost of slightly higher on-resistance and no through-hole option.

Availability

DG508ADJ+ is available at Aetrix Electronics and suitable for data-acquisition systems, aircraft heads-up displays, and industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG508ADJ+ 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 industrial, automotive, and communications applications.

The DG508A family was engineered as a drop-in, improved second source for legacy industry-standard analog multiplexers, emphasizing latchup immunity, low leakage, and wide dual-supply operation for ruggedized signal routing.

FAQ

What is the maximum analog signal voltage range supported by the DG508ADJ+?

The DG508ADJ+ supports an analog signal range of ±15V when operated at ±15V supplies. Its absolute maximum ratings allow signals up to ±15V relative to V−, and it maintains specified performance across the full supply range of ±4.5V to ±18V. This makes DG508ADJ+ suitable for applications involving rail-to-rail analog signals in industrial and avionics environments where signal fidelity at supply extremes is critical.

Does the DG508ADJ+ require external pull-up or pull-down resistors on its address or enable pins?

No, the DG508ADJ+ does not require external pull-up or pull-down resistors on A0, A1, A2, or EN pins. Its logic inputs are TTL- and CMOS-compatible with guaranteed thresholds of 0.8V (low) and 2.4V (high), and input leakage is limited to ±30μA across temperature. Internal design ensures stable logic recognition without external biasing, simplifying interface with microcontrollers and FPGAs in DG508ADJ+ implementations.

How does the DG508ADJ+ ensure reliability when power supplies are turned off while analog signals remain present?

The DG508ADJ+ uses latchup-proof monolithic CMOS construction that guarantees no destructive latchup occurs if V+ or V− are powered down while analog inputs remain active. This is achieved via process-level isolation and guarded well structures. As a result, DG508ADJ+ maintains safe operation in systems where signal sources (e.g., sensors or transducers) stay live during maintenance or partial shutdown - a key reliability feature confirmed in Maxim's characterization testing.

What is the break-before-make interval specification for the DG508ADJ+ and why is it important?

The DG508ADJ+ guarantees a break-before-make interval of ≤0.2μs, measured between the turn-off of the previously selected channel and turn-on of the newly selected one. This prevents momentary shorting between analog channels during switching - essential in applications like data acquisition where cross-channel coupling could corrupt measurements or damage upstream sources. The value is tested per Figure 3 in the DG508ADJ+ datasheet under standard ±15V conditions.

Can the DG508ADJ+ be used in single-supply configurations?

The DG508ADJ+ is specified exclusively for dual-supply operation (±4.5V to ±18V) and is not characterized for single-supply use. Its internal CMOS switch architecture requires symmetric positive and negative rails to maintain linearity, low distortion, and guaranteed break-before-make behavior. For single-supply applications, Maxim recommends alternatives such as the MAX338, which is explicitly designed for ±5V operation and shares functional similarity with DG508ADJ+ in multiplexing capability.