Analog Devices Inc./Maxim Integrated MAX11167ETC+

Overview

MAX11167ETC+ from Maxim Integrated is a 16-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with true bipolar ±5V input range, integrated 4.096V reference, and internal reference buffer. It operates from a single 5V analog supply and 2.3V–5.25V digital supply, achieving 93.2dB SNR and −102.5dB THD at 10kHz for high-fidelity data acquisition in industrial and medical instrumentation.

For engineers reviewing the MAX11167ETC+ datasheet, MAX11167ETC+ pinout, MAX11167ETC+ application, or MAX11167ETC+ equivalent, this page delivers verified specifications, SPI-compatible interface timing, TDFN-12 package layout, reference mode configuration options, and validated alternative ADCs for precision bipolar measurement systems.

Technical Context

The MAX11167ETC+ implements a pseudo-differential sampling architecture with patented charge-pump input stage enabling direct high-impedance source interfacing without external op-amp buffering. Its internal track-and-hold acquires input signals within 1µs, supporting full 16-bit accuracy across the ±5V range while rejecting common-mode noise up to −0.9 LSB/V.

It supports four configurable reference modes via SPI register: internal bandgap output on REFIO with buffered REF decoupling (Mode 0), external reference injection into REFIO with internal buffer (Mode 1), internal bandgap only on REFIO with REF high-Z (Mode 2), or full shutdown of both reference source and buffer (Mode 3). Each mode mandates specific external capacitor values (0.1µF on REFIO, 10µF on REF) for stability and noise suppression.

Key Specifications

Pinout & Package

MAX11167ETC+ is housed in a 12-pin, 3mm × 3mm TDFN package with exposed thermal pad (EP) connected to GND. Pin assignments are validated per Maxim's official datasheet (Rev 4, May 2015) and support compact PCB layout with minimal decoupling requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC applications.

Compared with MAX11167ETC+, MAX11169ETC+ trades lower power and tighter THD for doubled throughput, while AD7682BCPZ sacrifices integration and bipolar simplicity for extended input range-making MAX11167ETC+ optimal for space-constrained, low-power ±5V measurement nodes.

Availability

MAX11167ETC+ is available at Aetrix Electronics and suitable for data acquisition systems, industrial control systems, and medical instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX11167ETC+ 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 demanding industrial, medical, and communications applications.

The MAX11167ETC+ belongs to Maxim's high-accuracy SAR ADC family targeting applications needing true bipolar input, integrated reference, and minimal external components-designed specifically for compact, low-power, high-fidelity measurement systems.

FAQ

What is the absolute maximum input voltage for MAX11167ETC+?

The MAX11167ETC+ specifies an absolute maximum AIN+ voltage of ±7V relative to GND. This limit is enforced by internal overvoltage clamps that activate beyond ±(VDD + 300mV). For reliable 16-bit operation, the recommended analog input range remains ±5V (±K×VREF), with AIN− constrained to −0.1V to +0.1V. Exceeding ±7V risks permanent damage per Absolute Maximum Ratings.

Does MAX11167ETC+ require an external reference to operate?

No, MAX11167ETC+ does not require an external reference. It integrates a 4.096V bandgap reference with ±6.7ppm/°C temperature coefficient and an internal buffer. In Reference Mode 0, the device uses the internal reference output on REFIO, filtered by a 0.1µF capacitor, then buffered and decoupled on REF with a 10µF capacitor-enabling fully self-contained operation.

Can MAX11167ETC+ interface directly with a 1.8V microcontroller?

Yes, MAX11167ETC+ supports 2.3V–5.25V digital supply (OVDD), making it compatible with 1.8V MCUs when used with a level-shifting interface or external voltage translator. The digital inputs (DIN, SCLK, CNVST) accept VIH ≥ 0.7×OVDD and VIL ≤ 0.3×OVDD, so at OVDD = 2.3V, VIH min = 1.61V - above 1.8V logic high threshold. Direct connection is feasible with proper OVDD regulation.

What is the minimum acquisition time required for full 16-bit accuracy with MAX11167ETC+?

The MAX11167ETC+ guarantees full 16-bit accuracy with a minimum acquisition time (tACQ) of 1µs, defined as tCYC − tCONV where tCYC ≥ 4µs and tCONV ≤ 3.0µs. To achieve this, the source impedance driving AIN+ must satisfy RSOURCE × CLOAD ≤ tACQ/12 ≈ 83ns - i.e., ≤1042Ω for direct drive (CLOAD ≈ 20pF). Higher impedances require external buffering per the Typical Operating Circuit.

How does the daisy-chain mode work on MAX11167ETC+?

In daisy-chain mode, multiple MAX11167ETC+ devices share a single SPI bus: DOUT of one device connects to DIN of the next, with all SCLK and CNVST lines tied together. A single CNVST pulse triggers simultaneous sampling across all devices; subsequent SCLK cycles shift out conversion results sequentially. This eliminates channel skew and reduces MCU GPIO usage versus individual CS-based addressing.