Analog Devices Inc./Maxim Integrated MAX1133BEAP+

Overview

MAX1133BEAP+ from Maxim Integrated is a 16-bit, 200ksps successive-approximation ADC with integrated +4.096V reference, internal track/hold, and SPI/QSPI/MICROWIRE-compatible serial interface. It accepts ±4.096V bipolar or 0 to +4.096V unipolar analog inputs, operates from a single +4.75V to +5.25V supply, and delivers ≥85dB SINAD at 5kHz - ideal for precision industrial data acquisition and medical instrumentation.

For engineers reviewing the MAX1133BEAP+ datasheet, MAX1133BEAP+ pinout, MAX1133BEAP+ application, or MAX1133BEAP+ equivalent, this page provides verified specifications, validated pin functions, confirmed operating modes (internal/external clock, unipolar/bipolar), real-world timing constraints (tACQ = 1.14µs bipolar), and two rigorously cross-checked alternative parts for design continuity.

Technical Context

The MAX1133BEAP+ implements a successive-approximation architecture with integrated input scaling network and on-demand software calibration for offset, gain, and linearity correction. Its internal bandgap reference (±20ppm/°C tempco) feeds a buffered +4.096V output, adjustable via REFADJ pin, and supports external reference operation when REFADJ is tied to AVDD.

It features three user-programmable CMOS outputs (P0–P2) controlled by Control Byte bits 0–2, and dual clocking modes: internal clock (freeing MCU resources, SSTRB indicates conversion start/end) or external clock (SCLK drives conversion steps, 24/32-cycle modes). Serial interface uses MSB-first, straight-binary (unipolar) or two's-complement (bipolar) output format.

Key Specifications

Pinout & Package

MAX1133BEAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, footprint compatible with industry-standard 20-SSOP layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1133BEAP+, ADS8860IDRCT offers higher throughput but increases system complexity with external analog front-end requirements, while AD7682BRMZ matches key specs but removes the integrated programmable logic outputs critical for compact sensor interface architectures.

Availability

MAX1133BEAP+ is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and portable data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1133BEAP+ 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 MAX1132/MAX1133 product line delivers high-resolution, low-power SAR ADCs with integrated references and flexible digital interfaces - engineered specifically for space-constrained, high-accuracy data acquisition systems operating across −40°C to +85°C.

FAQ

What is the guaranteed integral nonlinearity (INL) specification for MAX1133BEAP+?

The MAX1133BEAP+ is specified with ±1.5LSB maximum INL over the full operating temperature range (−40°C to +85°C), corresponding to the 'B' grade in Maxim's ordering nomenclature. This value is tested and guaranteed per the device's electrical characteristics table and applies to both unipolar and bipolar input modes. The MAX1133BEAP+ achieves this performance through on-chip calibration circuitry that corrects for manufacturing variations and thermal drift.

Does MAX1133BEAP+ support both internal and external reference configurations?

Yes, MAX1133BEAP+ supports both internal and external reference operation. In internal mode, it provides a +4.096V reference at the REF pin, adjustable via the REFADJ pin. To use an external reference, connect REFADJ to AVDD to disable the internal buffer, then apply a 3.0V to 4.2V reference to the REF pin. The device automatically adapts full-scale range proportionally - for example, a 3.3V external reference yields a ±3.3V bipolar input range.

How does the MAX1133BEAP+ handle analog input overvoltage protection?

The MAX1133BEAP+ includes robust analog input protection: its AIN pin withstands voltages from −16.5V to +16.5V relative to AGND, independent of power supply status. This protection remains fully active even when AVDD = 0 or the device is in shutdown mode. Internal resistor networks limit fault current to less than 2mA, preventing damage to the input stage or downstream circuitry without requiring external clamping components.

Can the three programmable outputs (P0, P1, P2) of MAX1133BEAP+ drive a multiplexer directly?

Yes, the P0, P1, and P2 outputs of MAX1133BEAP+ are push-pull CMOS drivers capable of directly controlling standard 8-channel analog multiplexers (e.g., ADG728, MAX4617) or PGAs (e.g., AD8250). Each output sources/sinks ≥16mA at VOL ≤ 0.8V and VOH ≥ DVDD − 0.5V, eliminating the need for external level-shifting or buffering. Their states are updated simultaneously with each Control Byte write and persist during software shutdown.

What are the acquisition time requirements for MAX1133BEAP+ in bipolar mode?

In bipolar mode, MAX1133BEAP+ requires a minimum acquisition time (tACQ) of 1.14µs when using the internal clock, and 1.14µs in external clock mode with 24-clock configuration. This timing is strictly enforced by the internal track/hold circuit and must be respected to achieve guaranteed 16-bit accuracy and ≥85dB SINAD. The acquisition window begins after the Control Byte is latched and ends before conversion starts - violating tACQ degrades INL and noise performance.