Analog Devices Inc./Maxim Integrated DG509ABK

Overview

DG509ABK from Maxim Integrated is a monolithic CMOS differential 4-channel (2-of-8) 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 max off-leakage at ±10V, and 0.6μs typical switch transition time - enabling precision signal routing in high-reliability data-acquisition systems.

For engineers reviewing the DG509ABK datasheet, DG509ABK pinout, DG509ABK application, or DG509ABK equivalent, key selection criteria include its CERDIP-16 package, -20°C to +85°C extended temperature range, differential channel pairing for noise rejection, and TTL/CMOS-compatible logic inputs with sub-1μs enable timing.

Technical Context

The DG509ABK implements a fully decoded address logic block that selects one of four differential analog channel pairs (S1A/S1B through S4A/S4B) using two binary address inputs (A0, A1) and an active-high enable (EN). Its symmetrical bidirectional architecture supports equal analog signal handling in either direction without polarity constraints.

Internal protection diodes clamp analog inputs exceeding V+ or V−, while latchup-proof CMOS construction ensures robustness against supply sequencing faults. The device operates continuously across ±4.5V to ±18V supplies, with leakage and on-resistance specified over full temperature range (-20°C to +85°C) per its ABK grade.

Key Specifications

Pinout & Package

DG509ABK is housed in a hermetically sealed 16-pin CERDIP (Ceramic Dual In-line Package), rated for -20°C to +85°C operation and suitable for high-reliability aerospace and industrial environments where moisture resistance and thermal stability are critical.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX339CPE+ and ADG509AKRZ, the DG509ABK offers superior off-isolation (68dB vs. 60dB) and lower leakage (±200nA vs. ±500nA), making it preferred for precision DC-coupled measurements despite slightly higher on-resistance.

Availability

DG509ABK is available at Aetrix Electronics and suitable for control systems, data-acquisition systems, and aircraft heads-up displays requiring stable component supply, long-term obsolescence management, and hermetic packaging assurance.

Supply support for DG509ABK 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, communications, and computing applications.

The DG509ABK belongs to Maxim's legacy monolithic CMOS analog multiplexer family, engineered for high-reliability signal routing in harsh-environment instrumentation where latchup immunity and wide supply tolerance are mandatory.

FAQ

What is the maximum analog signal voltage range supported by the DG509ABK?

The DG509ABK supports an analog signal range of ±15V when operated with ±15V supplies. Its absolute maximum ratings allow V+ up to +44V referenced to V−, but the usable linear analog range remains bounded by the supply rails - i.e., signals must stay within V− and V+. For ±12V operation, the valid range is ±12V. This rail-to-rail capability makes DG509ABK suitable for interfacing with industrial sensors and legacy instrumentation without external level shifting.

Does the DG509ABK require external pull-up or pull-down resistors on its logic inputs?

No, the DG509ABK does not require external pull-up or pull-down resistors on A0, A1, or EN. Its logic inputs are TTL- and CMOS-compatible, with guaranteed recognition of low-level inputs down to 0.8V and high-level inputs up to 2.4V. Input leakage remains below ±30μA across temperature, so direct connection to microcontroller GPIOs or FPGA outputs is safe and reliable. This simplifies PCB layout and reduces BOM count in compact data-acquisition modules using DG509ABK.

How does the break-before-make timing of the DG509ABK prevent signal corruption?

The DG509ABK guarantees a minimum 0.2μs break interval between channel disconnect and reconnect during address changes. This prevents momentary shorting between analog sources - critical when multiplexing mismatched voltage sources (e.g., different sensor outputs or reference voltages). In applications like automated test equipment, this eliminates transient glitches that could saturate downstream amplifiers or corrupt ADC conversions. The timing is process- and temperature-invariant, ensuring consistent behavior across the -20°C to +85°C range of DG509ABK.

Can the DG509ABK operate from a single +5V supply?

No, the DG509ABK requires dual symmetric supplies (e.g., ±5V, ±12V, ±15V) and cannot operate from a single +5V rail. Its design mandates separate V+ and V− pins with GND as reference; the minimum recommended supply is ±4.5V. For single-supply 5V systems, Maxim recommends the pin-compatible MAX339, which supports +5V operation and offers lower on-resistance. Attempting to bias DG509ABK on single supply risks undefined switching behavior and potential damage due to internal node violations.

What is the significance of the "BK" suffix in DG509ABK?

The "BK" suffix in DG509ABK denotes the CERDIP-16 package and the -20°C to +85°C extended industrial temperature grade. Unlike plastic DIP (J) or SO (WE/DY) variants, BK specifies a ceramic dual-in-line package with glass-sealed leads - offering superior moisture resistance, thermal cycling endurance, and long-term parameter stability. This makes DG509ABK appropriate for aerospace, defense, and oilfield electronics where hermeticity and reliability outweigh cost sensitivity.