Analog Devices Inc./Maxim Integrated DG408CY+T

Overview

DG408CY+T from Maxim Integrated is a precision 1-of-8 CMOS analog multiplexer/demultiplexer designed for bidirectional signal routing in data-acquisition and test systems. It delivers guaranteed 100Ω max on-resistance, 8Ω max channel-to-channel matching, and 15pC max charge injection, operating across ±5V to ±20V dual supplies or +5V to +30V single supply. Its rail-to-rail signal handling and TTL/CMOS-compatible digital controls make it suitable for high-fidelity analog switching in guidance systems and audio routing.

For engineers reviewing the DG408CY+T datasheet, DG408CY+T pinout, DG408CY+T application, or DG408CY+T equivalent, key selection criteria include on-resistance flatness (9Ω max), input off-leakage (<5nA at +85°C), enable timing (tON(EN) ≤ 300ns), and ESD robustness (>2000V per MIL-STD-883 Method 3015.7).

Technical Context

The DG408CY+T implements a CMOS transmission-gate architecture with integrated decoder logic for 3-bit address selection (A0–A2) and active-low enable (EN). Its switch cells are optimized for low distortion across the full analog signal range (±15V with ±15V supplies), maintaining consistent rDS(ON) vs. voltage and temperature per Figure TOC-01 and TOC-02.

Dynamic performance is defined by break-before-make operation (tOPEN ≤ 450ns), fast transition times (tTRANS ≤ 600ns), and tightly controlled charge injection (Q ≤ 15pC), enabling accurate sample-and-hold functionality without significant hold-step error in precision ADC front-ends.

Key Specifications

Pinout & Package

DG408CY+T is supplied in a 16-pin narrow SOIC (Small Outline Integrated Circuit) package, 3.9mm body width, with standard 1.27mm pitch and gull-wing leads. Pin 1 is marked with a beveled corner or dot; pin numbering follows counter-clockwise convention from top-left when viewed from component side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG408CY+T, ADG408BRZ trades guaranteed charge injection and dual-supply flexibility for broader temperature coverage, while MAX4617ESA+ sacrifices bipolar operation and channel matching for ultra-low power and smaller on-resistance in unipolar systems.

Availability

DG408CY+T is available at Aetrix Electronics and suitable for data-acquisition systems, automated test equipment, and guidance and control systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for DG408CY+T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The DG408CY+T belongs to Maxim's precision analog switch family, engineered specifically for low-distortion, low-leakage signal routing in measurement and control applications demanding guaranteed parametric performance over temperature and supply variations.

FAQ

What supply configurations does the DG408CY+T support?

The DG408CY+T operates with either a single supply (+5V to +30V, with V− tied to GND) or dual supplies (±5V to ±20V). It requires proper sequencing: V+ first, then V−, then logic inputs. Unbalanced supplies (e.g., +24V/−5V) are supported as long as the total differential does not exceed +44V. This flexibility allows integration into both legacy industrial systems and modern low-power designs without external level shifters.

Is the DG408CY+T pin-compatible with the original DG408?

Yes, the DG408CY+T is explicitly designed as a pin-compatible plug-in upgrade for the industry-standard DG408. All 16 pins retain identical functions, electrical behavior, and mechanical footprint. No PCB changes or layout modifications are required when replacing legacy DG408 variants with DG408CY+T, preserving design integrity while delivering improved specs including tighter on-resistance matching and lower charge injection.

What is the maximum allowable analog signal range for DG408CY+T at ±15V supplies?

At ±15V dual supplies, the DG408CY+T supports a full rail-to-rail analog signal range of ±15V - meaning signals from −15V to +15V can pass through any selected channel without clipping or distortion. This range is confirmed in the Electrical Characteristics table under "Analog Signal Range" and validated across temperature in Typical Operating Characteristics Figure TOC-01 and TOC-02.

How does the DG408CY+T handle charge injection in sample-and-hold applications?

The DG408CY+T guarantees ≤15pC maximum charge injection, directly limiting the voltage error imposed on a sampling capacitor. For example, with a 10nF hold capacitor, the worst-case step error is 1.5mV - enabling accurate 16-bit sampling without additional correction circuitry. This spec is tested and guaranteed across temperature and supply conditions, making DG408CY+T suitable for high-fidelity data-acquisition front-ends.

Does the DG408CY+T require external protection diodes for overvoltage conditions?

No, external protection diodes are not required for normal operation within Absolute Maximum Ratings. However, if power-supply sequencing cannot be guaranteed (e.g., hot-plug scenarios), two small-signal diodes may be added in series with V+ and V− pins per Figure 1 in the datasheet. This reduces the usable analog range by ~1V but preserves low on-resistance and leakage performance - a trade-off only needed in non-sequenced power environments.