Analog Devices Inc./Maxim Integrated MAX166ACWP

Overview

MAX166ACWP from Maxim Integrated is a 12-bit, 100ksps successive-approximation analog-to-digital converter (ADC) with internal track/hold and reference, housed in a 28-pin SOIC package. It operates from a single +5V supply, features ±1 LSB integral nonlinearity, and supports parallel CPU interface for embedded data acquisition systems.

For engineers reviewing the MAX166ACWP datasheet, MAX166ACWP pinout, MAX166ACWP application, or MAX166ACWP equivalent, key selection considerations include its 12-bit resolution, 100ksps throughput, single-supply operation, internal reference, and parallel 8-bit data bus compatibility with 8051 and Z80 microcontrollers.

Technical Context

The MAX166ACWP employs a successive-approximation register (SAR) architecture with an integrated sample-and-hold amplifier and precision 2.5V bandgap reference. It uses a parallel 8-bit data bus with separate RD, WR, and CS control lines for direct microprocessor interfacing.

Conversion timing is controlled by an internal clock synchronized to WR pulse width; no external clock is required. The device supports both unipolar (0V to VREF) and bipolar (±VREF) input ranges via external resistor configuration at the IN+ and IN− inputs.

Key Specifications

Pinout & Package

MAX166ACWP is packaged in a 28-pin wide-body SOIC (SO28W) with 0.3-inch body width and standard 0.050-inch pin pitch. Pin functions are validated per Maxim's MAX166 datasheet Rev. 0 (1994).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7892ARZ-1 and ADS7822U, the MAX166ACWP offers unique value in systems requiring direct 8-bit microcontroller interfacing without external reference or clock generation-ideal for cost-sensitive, space-constrained industrial controllers where parallel simplicity outweighs marginal speed gains.

Availability

MAX166ACWP is available at Aetrix Electronics and suitable for industrial data acquisition, embedded test equipment, and medical instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for MAX166ACWP 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 MAX166ACWP belongs to Maxim's legacy high-accuracy SAR ADC product line, developed specifically for microprocessor-based data acquisition systems needing integrated reference and parallel interface.

FAQ

What is the maximum sampling rate supported by the MAX166ACWP?

The MAX166ACWP supports a maximum sampling rate of 100ksps. This rate is achieved using its internal clock synchronized to the WR pulse width, eliminating the need for an external clock source. At this speed, the MAX166ACWP maintains its specified ±1 LSB integral nonlinearity and 12-bit resolution across the full operating temperature range.

Does the MAX166ACWP require an external reference voltage?

No, the MAX166ACWP includes an internal 2.5V bandgap reference, accessible at the VREF pin. This reference can be used directly or overdriven with an external precision source for custom full-scale ranges. Using the internal reference eliminates external components and improves system-level accuracy stability over temperature and time.

Which microcontrollers are compatible with the MAX166ACWP's parallel interface?

The MAX166ACWP's parallel 8-bit interface is designed for direct connection to 8-bit microcontrollers including the Intel 8051 family and Zilog Z80 series. Its RD, WR, and CS timing aligns with standard microprocessor bus cycles, enabling glueless integration without additional logic or level-shifting circuitry in +5V systems.

Can the MAX166ACWP operate with bipolar input signals?

Yes, the MAX166ACWP supports bipolar input configurations (±VREF) through external resistor networks connected to the IN+ and IN− pins. When configured for bipolar mode, it digitizes signals ranging from –2.5V to +2.5V using the internal 2.5V reference. Unipolar operation (0V to +2.5V) is the default and requires only IN+ referenced to IN− tied to AGND.

What package type is used for the MAX166ACWP?

The MAX166ACWP is supplied in a 28-pin wide-body SOIC (SO28W) package with 0.3-inch body width and 0.050-inch pin pitch. This surface-mount package provides mechanical robustness and thermal performance suitable for industrial PCB assemblies, and is compatible with standard reflow soldering processes.