Analog Devices Inc./Maxim Integrated DG509ADJ+

Overview

DG509ADJ+ from Maxim Integrated is a differential 4-channel (2-of-8) monolithic CMOS analog multiplexer with break-before-make switching, ±4.5V to ±18V dual-supply operation, and guaranteed latchup immunity during power-off signal presence. It features 500Ω typical on-resistance, <0.5nA off-leakage at ±10V, and operates across –40°C to +85°C in 16-pin plastic DIP packaging - used for precision signal routing in data-acquisition systems.

For engineers reviewing the DG509ADJ+ datasheet, DG509ADJ+ pinout, DG509ADJ+ application, or DG509ADJ+ equivalent, key selection criteria include its differential channel architecture, rail-to-rail analog signal range (±15V), TTL/CMOS-compatible logic inputs, low-power standby current (0.02mA), and industrial temperature rating - critical for ruggedized analog front-end designs.

Technical Context

The DG509ADJ+ implements a fully decoded 2-bit address interface (A0, A1) controlling four differential switch pairs (S1A/S1B through S4A/S4B), each bidirectional and symmetrical. Its internal CMOS design ensures matched on-resistance and capacitance across channels, enabling balanced differential signal paths without polarity inversion.

Break-before-make timing is guaranteed at ≤0.2μs, preventing momentary shorting between active channels. Enable control (EN) provides full device gating with 0.4μs turn-on and 0.2μs turn-off times, while latchup-proof construction allows safe operation with input signals present during power cycling.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (0.3-inch width), RoHS-compliant with lead-free finish (indicated by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG509ADJ+, MAX339CPE+ offers superior performance at low voltage but sacrifices high-voltage robustness, while ADG509AKRZ provides pin-compatible redundancy with trade-offs in leakage and on-resistance - making DG509ADJ+ optimal for wide-supply, low-leakage industrial signal routing.

Availability

DG509ADJ+ is available at Aetrix Electronics and suitable for aircraft heads-up displays, data-acquisition systems, and industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG509ADJ+ 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 DG509ADJ+ belongs to Maxim's legacy monolithic CMOS analog multiplexer family, engineered for high-reliability signal routing in harsh environments where supply flexibility, latchup immunity, and differential noise rejection are essential.

FAQ

What is the maximum analog signal voltage supported by the DG509ADJ+?

The DG509ADJ+ supports analog signals from V− to V+, with a specified range of ±15V when operated at ±15V supplies. Absolute maximum ratings allow V+ up to +44V referenced to V−, but functional analog signal swing remains bounded by the applied supply rails - so ±18V supplies enable ±18V signal handling. This rail-to-rail capability makes DG509ADJ+ suitable for high-dynamic-range sensor interfaces without external level shifting.

Does the DG509ADJ+ require external pull-up or pull-down resistors on address or enable pins?

No, the DG509ADJ+ does not require external pull-up or pull-down resistors on A0, A1, or EN pins. Its logic inputs are TTL- and CMOS-compatible with guaranteed thresholds (0.8V low, 2.4V high) and input currents below ±30μA across temperature. Internal design ensures stable state retention without external biasing - simplifying PCB layout and reducing BOM count in space-constrained applications using DG509ADJ+.

How does the break-before-make interval of the DG509ADJ+ prevent signal corruption?

The DG509ADJ+ guarantees a break-before-make interval of ≤0.2μs, ensuring that the previously selected differential channel disconnects completely before the next channel connects. This eliminates momentary short-circuits between sources - critical in applications like motor phase current sensing or multi-transducer data acquisition where cross-channel conduction could distort readings or damage upstream circuitry. The specification is tested and guaranteed across –40°C to +85°C for DG509ADJ+.

Can the DG509ADJ+ operate with asymmetric supplies, such as +12V and –5V?

Yes, the DG509ADJ+ can operate with asymmetric supplies as long as both V+ and V− remain within their absolute maximum ratings (V+ ≤ V− + 44V, GND ≤ V− + 25V) and the total span meets minimum operating requirements. However, analog signal range becomes limited to V− to V+, and on-resistance and leakage specs are characterized at symmetric ±15V - so performance validation is required per application. DG509ADJ+ retains latchup immunity and break-before-make timing under asymmetric conditions.

What is the thermal resistance (θJA) of the DG509ADJ+ in its 16-pin plastic DIP package?

The DG509ADJ+ in 16-pin plastic DIP has a junction-to-ambient thermal resistance (θJA) of 119°C/W, derived from its 842mW maximum continuous power dissipation at +70°C and 10.53mW/°C derating above that temperature. This value assumes standard JEDEC 2-layer board conditions. For sustained operation near maximum ratings, thermal relief pads and airflow should be considered - especially in enclosed industrial enclosures where ambient may exceed +70°C, affecting long-term reliability of DG509ADJ+.