Analog Devices Inc./Maxim Integrated MAX11165ETC+

Overview

MAX11165ETC+ from Maxim Integrated is a 16-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with integrated ±6ppm/°C internal reference, 92.4dB SNR, ±0.6 LSB INL (typ), and unipolar 0 to 5V input range. It operates from a 5V analog supply and 2.3V–5.25V digital supply, delivering high-precision data acquisition in compact industrial sensor interfaces.

For engineers reviewing the MAX11165ETC+ datasheet, MAX11165ETC+ pinout, MAX11165ETC+ application, or MAX11165ETC+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and interface differences.

Technical Context

The MAX11165ETC+ implements a true pseudo-differential sampling architecture with 6MHz small-signal bandwidth and 1µs acquisition time, enabling accurate multiplexed channel sampling. Its internal reference buffer drives the REF pin with ±500µV offset (typ) and ±4µV/°C drift, supporting stable 16-bit conversion without external buffering in reference mode 0.

It uses an SPI-compatible serial interface with daisy-chain capability and busy indicator output, operating at logic levels from 2.3V to 5V. The device supports four configurable reference modes-internal bandgap only, internal buffered, external reference with internal buffer, or fully external-each requiring distinct decoupling (e.g., 10µF on REF, 0.1µF on REFIO).

Key Specifications

Pinout & Package

The MAX11165ETC+ is housed in a 12-pin, 3mm × 3mm TDFN package with exposed pad (EP) thermally connected to PCB ground. Pin numbering follows top-view orientation with pin 1 at top-left corner.

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 MAX11165ETC+ delivers optimal balance of integration (internal reference + buffer), precision (±0.6 LSB INL), and ease of use (SPI interface, 2.3–5V logic compatibility), making it ideal for space-constrained industrial and medical DAQ where 250ksps suffices.

Availability

MAX11165ETC+ 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 guaranteed traceability.

Supply support for MAX11165ETC+ 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 high-frequency ICs for industrial, medical, and communications applications.

The MAX11165ETC+ belongs to Maxim's high-accuracy SAR ADC family targeting applications needing integrated references, low power, and small footprint-designed specifically for sensor signal conditioning in harsh environments.

FAQ

What is the maximum sampling rate of the MAX11165ETC+ and how is it achieved?

The MAX11165ETC+ achieves a maximum throughput rate of 250ksps with no pipeline delay or latency. This is accomplished using an internally clocked SAR architecture that completes conversion in ≤3.0µs after the CNVST rising edge, followed by a 1µs acquisition period-enabling deterministic timing for real-time control loops. The MAX11165ETC+ maintains full 16-bit accuracy at this rate without performance degradation.

Does the MAX11165ETC+ require external components for its internal reference to function properly?

Yes-the MAX11165ETC+ requires specific external capacitors to stabilize its internal reference. In reference mode 0, a 0.1µF ceramic capacitor must be placed between REFIO and AGNDS, and a ≥10µF X5R/X7R ceramic capacitor must be placed between REF and AGNDS. These values are mandatory per the datasheet to ensure ±6ppm/°C tempco and 92.4dB SNR performance. Omitting either capacitor degrades reference stability and increases noise.

Can the MAX11165ETC+ interface directly with a 1.8V microcontroller?

No-the MAX11165ETC+ digital interface (DIN, SCLK, CNVST, DOUT) operates at OVDD voltage levels from 2.3V to 5.25V. Its VIH threshold is 0.7 × OVDD and VIL is 0.3 × OVDD, so with OVDD = 2.3V, VIH = 1.61V minimum-insufficient for reliable 1.8V logic high detection. To interface with a 1.8V MCU, a level-shifting buffer such as TXB0108 or dedicated SPI level translator is required.

How does the MAX11165ETC+ handle overvoltage conditions on the analog inputs?

The MAX11165ETC+ features integrated input clamps that activate when AIN+ exceeds –300mV or (VDD + 300mV). Within the safe range (–100mV to VDD + 100mV), clamp leakage is negligible (<10nA). During overvoltage, clamps limit fault current to ±20mA-requiring an external series resistor (RS) to constrain current per RS = (VFAULTMAX – 7V)/20mA. This eliminates need for discrete TVS diodes in most industrial front-ends.

What is the purpose of the AGNDS pin on the MAX11165ETC+ and how should it be connected?

The AGNDS pin on the MAX11165ETC+ serves as the zero-current reference node for the internal DAC, reference buffer, and REFIO/REF circuitry. It must be connected directly to the clean analog ground plane-not shared with digital or power ground-and routed separately from GND to avoid noise coupling. Incorrect AGNDS connection causes reference instability and increased INL error beyond ±0.6 LSB specification.