Analog Devices Inc./Maxim Integrated MAX11100EWC+T

Overview

MAX11100EWC+T from Maxim Integrated is a 16-bit successive-approximation analog-to-digital converter (SAR 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, ±2LSB INL, and 0.1µA shutdown current, serving as a precision front-end digitizer in low-power industrial data acquisition systems.

For engineers reviewing the MAX11100EWC+T datasheet, MAX11100EWC+T pinout, MAX11100EWC+T application, or MAX11100EWC+T equivalent, key selection criteria include unipolar 0–VREF input range, SPI/QSPI/MICROWIRE serial interface timing compliance, track-and-hold acquisition time ≤1.1µs, and thermal drift of offset (0.4ppm/°C) and gain (0.2ppm/°C).

Technical Context

The MAX11100EWC+T implements a capacitive DAC-based SAR architecture with integrated track-and-hold, supporting full-scale input bandwidth up to 4MHz and requiring external reference voltage (3.8V to VAVDD). Its conversion sequence is initiated by CS falling edge and driven by SCLK, outputting 24-bit serial frames (8 leading zeros + 16 data bits, MSB first).

Power management uses AutoShutdown™: CS high forces shutdown (≤0.1µA total supply current), while CS low enables normal operation with dynamic current scaling-2.45mA at 200ksps, 140µA at 10ksps. Digital I/O tolerates 2.7V–5.25V DVDD, and analog inputs are protected to AVDD ±0.3V.

Key Specifications

Pinout & Package

MAX11100EWC+T is packaged in a 10-pin µMAX (FMAX®) package, 3mm × 3mm, exposed pad, RoHS-compliant. Pinout validated per Maxim Integrated datasheet Rev 1 (Jan 2012).

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-RL7, the MAX11100EWC+T uniquely balances 5V logic compatibility, sub-µA shutdown, and –40°C to +85°C guaranteed INL-making it optimal for cost-sensitive, battery-aware industrial edge nodes rather than lab-grade or high-speed systems.

Availability

MAX11100EWC+T is available at Aetrix Electronics and suitable for motor control feedback loops, industrial thermocouple measurement modules, and portable battery-powered data-acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for MAX11100EWC+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, designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX11100EWC+T belongs to Maxim's low-power precision SAR ADC family, engineered for space-constrained, battery-aware industrial data acquisition where 16-bit accuracy must coexist with µA-level shutdown and 5V system compatibility.

FAQ

What is the absolute maximum analog input voltage for the MAX11100EWC+T?

The MAX11100EWC+T specifies an absolute maximum analog input voltage of AVDD + 0.3V relative to AGND. With AVDD = 5.25V, this allows AIN to safely reach +5.55V. Exceeding this risks damage via internal ESD diode conduction. The functional input range remains 0 to VREF (max 5.25V), so design must ensure signal clamping or buffering stays within these limits. The MAX11100EWC+T datasheet explicitly defines this rating in its Absolute Maximum Ratings table.

Does the MAX11100EWC+T require an external reference, and what are the key requirements?

Yes, the MAX11100EWC+T requires an external reference applied to the REF pin, with voltage range 3.8V to AVDD (i.e., up to 5.25V). Critical requirements include: DC load current capability ≥100µA during conversion, output impedance ≤10Ω, and bypassing with a 4.7µF capacitor to AGND. Noise on REF directly degrades LSB accuracy; the MAX11100EWC+T's 38µV_RMS input noise means reference voltage noise should be <10µV_RMS for optimal performance.

How does the MAX11100EWC+T achieve 0.1µA shutdown current, and what triggers it?

The MAX11100EWC+T achieves ≤0.1µA shutdown current by driving the CS pin high, which disables internal bias circuits and places DOUT in high-impedance state. This AutoShutdown™ mode is specified at T_A = +25°C and confirmed across –40°C to +85°C in typical operating characteristics (Figure toc13). No additional control signals or sequencing are needed-CS high alone suffices. The MAX11100EWC+T datasheet confirms this behavior under "Shutdown Supply Current" in Electrical Characteristics.

Can the MAX11100EWC+T interface directly with a 3.3V microcontroller SPI port?

Yes, the MAX11100EWC+T supports direct 3.3V SPI interfacing because its DVDD accepts 2.7V–5.25V, and digital inputs (CS, SCLK) have VIH = 0.7×VDVDD and VIL = 0.3×VDVDD. With DVDD = 3.3V, VIH = 2.31V and VIL = 0.99V-fully compatible with standard 3.3V logic levels. DOUT output VOH/VOL specs also align with 3.3V drive strength. The MAX11100EWC+T functional diagram and Electrical Characteristics confirm this dual-voltage interoperability.

What is the acquisition time specification for the MAX11100EWC+T, and how is it affected by source impedance?

The MAX11100EWC+T specifies a maximum acquisition time (t_ACQ) of 1.1µs, defined as the time required for the internal track-and-hold to settle after CS falling edge. This value assumes source impedance ≤1kΩ; for higher impedances, t_ACQ increases per t_ACQ = 13(R_S + 800Ω) × 35pF. The MAX11100EWC+T datasheet provides this formula and warns that exceeding t_ACQ causes gain/linearity errors. Layout best practice is to use a low-Z driver or buffer for R_S >1kΩ.