Analog Devices Inc./Maxim Integrated MAX11100EUB+

Overview

MAX11100EUB+ from Maxim Integrated is a 16-bit successive-approximation analog-to-digital converter (ADC) operating from a single +5V analog supply with independent 2.7V–5.25V digital logic interface. It delivers 200ksps sampling rate, 86dB SINAD at 1kHz, ±2 LSB INL, and 0.1µA shutdown current - enabling high-resolution data acquisition in space-constrained, battery-powered systems such as portable instrumentation and industrial I/O modules.

For engineers reviewing the MAX11100EUB+ datasheet, MAX11100EUB+ pinout, MAX11100EUB+ application, or MAX11100EUB+ equivalent, key selection criteria include unipolar SPI/QSPI/MICROWIRE serial interface timing, 4MHz input bandwidth with internal track-and-hold, 10-pin µMAX® package footprint, and guaranteed no-missing-codes performance across –40°C to +85°C.

Technical Context

The MAX11100EUB+ implements a 16-bit SAR architecture with integrated track-and-hold, supporting unipolar input ranges up to VREF (3.8V–VAVDD). Its conversion sequence is initiated by CS falling edge and driven by SCLK, requiring exactly 24 clock cycles per 16-bit result preceded by eight leading zeros.

Power management is handled via AutoShutdown™: pulling CS high reduces total supply current to ≤0.1µA, while wake-up latency is fixed at 1.1µs. The dual-supply design isolates analog (AVDD/AGND) and digital (DVDD/DGND) domains, with strict DGND–AGND voltage differential limits (±0.3V) to maintain DC accuracy.

Key Specifications

Pinout & Package

The MAX11100EUB+ is packaged in a 10-pin µMAX® (FMAX) package, 3mm × 3mm, exposed pad, RoHS-compliant. Pin numbering follows top-view orientation with pin 1 marked by dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8860IDRCT and AD7960BCPZ, the MAX11100EUB+ provides optimal balance of 16-bit precision, ultra-low shutdown current (0.1µA), and compact 10-pin µMAX® footprint - making it uniquely suited for space- and energy-constrained industrial and portable designs where 200ksps is sufficient.

Availability

MAX11100EUB+ is available at Aetrix Electronics and suitable for motor control, industrial process control, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.

Supply support for MAX11100EUB+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX11100EUB+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, high-resolution measurement in space-constrained embedded systems where accuracy, size, and energy efficiency are co-primary constraints.

FAQ

What is the minimum SCLK frequency supported by the MAX11100EUB+ for reliable operation?

The MAX11100EUB+ supports SCLK frequencies down to 100kHz. Below this threshold, reduced conversion accuracy may occur due to increased leakage effects in the internal capacitive DAC array. For full 16-bit performance across temperature, maintain fSCLK ≥ 100kHz and ensure 40–60% duty cycle compliance per the datasheet timing specifications.

Does the MAX11100EUB+ require an external reference, and what are the key requirements?

Yes, the MAX11100EUB+ requires an external reference applied to the REF pin. The reference voltage must be between 3.8V and VAVDD (max +5.25V), deliver ≤10Ω output impedance, and be bypassed to AGND with a 4.7µF low-ESR capacitor. Reference noise directly impacts SNR - select references with ≤10µVpp broadband noise to preserve the device's 86dB SINAD specification.

How does the MAX11100EUB+ handle input overvoltage conditions on the AIN pin?

The MAX11100EUB+ includes internal ESD protection diodes that clamp AIN to AVDD or AGND. The absolute maximum rating allows AIN to swing from (AGND – 0.3V) to (AVDD + 0.3V). If the input exceeds this range by more than 300mV, external series resistance must limit current to ≤10mA to prevent damage. No internal overvoltage protection beyond clamping is provided.

Can the MAX11100EUB+ interface directly with a 3.3V microcontroller without level shifting?

Yes, the MAX11100EUB+ supports 2.7V–5.25V DVDD, allowing direct connection to 3.3V logic. SCLK and CS inputs accept VIH ≥ 0.7×VDVDD (≥2.31V) and VIL ≤ 0.3×VDVDD (≤0.99V), fully compatible with 3.3V CMOS thresholds. DOUT output swings from 0.4V (low) to VDVDD–0.25V (high), ensuring clean logic levels into 3.3V receivers without translation.

What is the acquisition time specification for the MAX11100EUB+, and how does source impedance affect it?

The MAX11100EUB+ specifies a maximum acquisition time (tACQ) of 1.1µs. This value assumes source impedance ≤1kΩ. For higher impedances, tACQ increases per tACQ = 13×(RS + 800Ω)×35pF. At RS = 10kΩ, tACQ ≈ 5.1µs - requiring longer inter-conversion delays or an input buffer to maintain 16-bit settling accuracy.