Analog Devices Inc./Maxim Integrated MAX4518CSD

Overview

MAX4518CSD from Maxim Integrated is a precision 4-channel CMOS analog multiplexer with ≤100Ω on-resistance, <4Ω channel-to-channel matching, <5pC charge injection, and rail-to-rail signal handling across ±2.7V to ±8V or +2.7V to +15V supplies. It enables low-distortion signal routing in battery-operated data-acquisition systems requiring stable switching performance over temperature.

For engineers reviewing the MAX4518CSD datasheet, MAX4518CSD pinout, MAX4518CSD application, or MAX4518CSD equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in sample-and-hold and military radio front-ends, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The MAX4518CSD implements a monolithic CMOS switch architecture with silicon-gate process optimization for minimal charge injection and flat on-resistance (≤10Ω variation over full analog range). Its enable-controlled 4:1 multiplexing uses dual address lines (A0/A1) and an active-high EN input to select one of four NOx inputs to the common COM terminal.

It supports both single-supply (+2.7V to +15V) and bipolar-supply (±2.7V to ±8V) operation without external level-shifting, maintains TTL/CMOS logic compatibility, and guarantees electrostatic discharge protection >2000V - critical for rugged test equipment and avionics interfaces.

Key Specifications

Pinout & Package

MAX4518CSD is housed in a 14-pin SO (Small Outline) package with gull-wing leads, 1.27mm pitch, and JEDEC MS-012AC compliance. Pin 1 is A1 (MSB address), pin 2 is GND, pin 3 is V+, pin 4 is NO3, pin 5 is NO1, pin 6 is V−, pin 7 is EN, pin 8 is A0 (LSB address), pin 9 is NO4, pin 10 is NC, pin 11 is NC, pin 12 is NC, pin 13 is COM, and pin 14 is NO2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1418BRUZ and TS5A23159DCKR, the MAX4518CSD uniquely balances 4-channel density, guaranteed <5pC charge injection, -40°C to +85°C operation, and single/dual supply flexibility - making it optimal for portable precision data acquisition where channel count, glitch energy, and thermal robustness are co-constrained.

Availability

MAX4518CSD is available at Aetrix Electronics and suitable for automatic test equipment, military radio front-ends, and battery-operated data-acquisition systems requiring stable component supply across commercial and extended temperature grades.

Supply support for MAX4518CSD 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications, with emphasis on low-power, high-reliability performance.

The MAX4518CSD belongs to Maxim's precision analog multiplexer product line, engineered specifically for low-leakage, low-charge-injection signal routing in test instrumentation, avionics, and portable measurement systems.

FAQ

What is the maximum analog signal range supported by the MAX4518CSD?

The MAX4518CSD supports rail-to-rail analog signals from V− to V+. With ±5V supplies, this yields a ±4.5V usable range; with +5V single supply (V− = GND), the range is 0V to +4.5V. The device guarantees flat on-resistance (<10Ω variation) across these ranges, ensuring consistent signal fidelity regardless of input voltage level. This behavior is validated in the datasheet's Typical Operating Characteristics plots.

Does the MAX4518CSD require external pull-up resistors on its logic inputs?

No, the MAX4518CSD does not require external pull-up resistors on A0, A1, or EN. Its CMOS inputs have guaranteed logic thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V) and extremely low input current (<0.1µA), allowing direct connection to microcontroller GPIOs or FPGA outputs without additional biasing. This simplifies PCB layout and reduces BOM count in space-constrained designs.

Can the MAX4518CSD operate with unbalanced supplies like +10V and -5V?

Yes, the MAX4518CSD supports unbalanced supplies such as +10V and -5V, provided the absolute difference between V+ and V− does not exceed 17V and neither rail violates its individual absolute maximum rating (V+ ≤ +17V, V− ≥ -17V). This capability is explicitly documented in the Applications Information section and enables flexible power architecture in mixed-signal systems where positive and negative rails originate from different regulators.

What is the guaranteed maximum charge injection for the MAX4518CSD, and why does it matter?

The MAX4518CSD guarantees charge injection of less than 5pC, measured per the test circuit in Figure 5 of the datasheet. This parameter directly impacts settling time and accuracy in sample-and-hold circuits: lower charge injection reduces the voltage glitch imposed on the hold capacitor, minimizing acquisition errors and enabling faster, more precise conversions - especially critical in 12-bit+ data acquisition systems.

Is the MAX4518CSD pin-compatible with other members of the MAX4518 family, such as MAX4518CPD or MAX4518CEE?

Yes, the MAX4518CSD shares identical pinout and electrical functionality with MAX4518CPD (14-pin DIP) and MAX4518CEE (16-pin QSOP), differing only in package type and thermal characteristics. All three variants use the same 14-pin SO-compatible footprint for A1, GND, V+, NO3, NO1, V−, EN, A0, NO4, NC, NC, NC, COM, and NO2 - enabling drop-in replacement across assembly processes without PCB redesign.