Analog Devices Inc./Maxim Integrated MAX1028BEEP+

Overview

MAX1028BEEP+ from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor, internal 4.096V reference, and 12-channel analog multiplexer supporting single-ended or true differential inputs. It features a 16-entry FIFO, internal clock mode, scan mode, and AutoShutdown™ for low-power operation at 2.3mA (300ksps) on +5V supply. Used in industrial control systems for real-time voltage and temperature monitoring.

For engineers reviewing the MAX1028BEEP+ datasheet, MAX1028BEEP+ pinout, MAX1028BEEP+ application, or MAX1028BEEP+ equivalent, this page delivers verified technical context, exact pin functions, confirmed operating parameters across -40°C to +85°C, and validated alternative parts for multichannel data acquisition with on-chip temperature sensing.

Technical Context

The MAX1028BEEP+ implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting unipolar (0 to VREF) or bipolar (±VREF/2) differential input ranges and single-ended inputs referenced to GND. Its internal oscillator enables autonomous conversions in clock modes 00, 01, and 10 without external timing control.

It integrates a 16-deep FIFO buffer that stores both ADC results and temperature measurements, allowing burst acquisition without serial bus contention. The device uses SPI/QSPI/MICROWIRE-compatible 3-wire interface (SCLK, DIN, DOUT, CS) with EOC signaling and supports internal averaging, scan sequencing, and AutoShutdown™ to reduce power during idle periods.

Key Specifications

Pinout & Package

MAX1028BEEP+ is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), RoHS-compliant and lead-free, rated for extended industrial temperature range (-40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel ADC with temperature-sensing applications.

Compared with ADS7822U and AD7490BRUZ, the MAX1028BEEP+ uniquely combines 10-bit accuracy, 12-channel flexibility, integrated temperature sensing, internal reference, and FIFO in a single 20-pin QSOP - reducing component count and layout complexity for embedded monitoring where thermal awareness is essential.

Availability

MAX1028BEEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, environmental data loggers, and motor drive thermal protection requiring stable component supply across extended temperature ranges.

Supply support for MAX1028BEEP+ 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 MAX1028BEEP+ belongs to Maxim's high-integration data acquisition family, engineered specifically for space-constrained, low-power systems needing simultaneous analog voltage and temperature measurement without external support components.

FAQ

What is the operating temperature range for the MAX1028BEEP+?

The MAX1028BEEP+ is specified for operation from -40°C to +85°C, matching its "E" grade designation. All key specifications-including INL, DNL, temperature sensor accuracy (±1.2°C), and supply current-are guaranteed across this full industrial temperature range. This makes the MAX1028BEEP+ suitable for deployment in harsh environments such as factory floors, outdoor instrumentation, and automotive under-hood monitoring where thermal stability is critical.

Does the MAX1028BEEP+ require an external reference voltage?

No, the MAX1028BEEP+ includes a factory-trimmed internal 4.096V reference with ±20ppm/°C temperature coefficient, eliminating the need for an external reference in most applications. An external differential reference can be applied via REF+ and REF- pins if higher precision or custom scaling is required-but doing so disables the internal reference and temperature sensor functionality. For standard operation, the internal reference is enabled by default and requires only a 0.1µF bypass capacitor on REF+.

How many analog input channels does the MAX1028BEEP+ support?

The MAX1028BEEP+ supports 12 single-ended analog input channels (AIN0–AIN9, REF-/AIN10, CNVST/AIN11) or 6 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.). Channel configuration is controlled via the setup register, and unused pins (e.g., REF-/AIN10 or CNVST/AIN11) can be reassigned as analog inputs. This flexibility allows the MAX1028BEEP+ to adapt to diverse signal sources without hardware changes-unlike fixed-input ADCs.

Can the MAX1028BEEP+ perform temperature measurements simultaneously with analog conversions?

Yes, the MAX1028BEEP+ integrates a calibrated on-die temperature sensor with ±1.2°C accuracy over -40°C to +85°C. Temperature measurements can be interleaved with analog channel scans using the FIFO-each temperature reading occupies one FIFO slot alongside ADC results. The sensor uses the internal reference exclusively and outputs data in two's complement format at 1/8°C resolution. No external sensor or calibration is needed, simplifying thermal monitoring in compact systems.

What serial interface protocols does the MAX1028BEEP+ support?

The MAX1028BEEP+ features a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface using SCLK, DIN, DOUT, and CS. It operates with CPOL = CPHA = 0 or 1, supports up to 10MHz SCLK, and uses MSB-first data framing. The interface handles configuration writes (setup, conversion, averaging registers), result reads, and supports EOC-driven interrupt-driven transfers. Unlike standard SPI, it does not require MISO/MOSI bidirectional lines-DOUT and DIN are separate, simplifying PCB routing and logic-level translation.