Analog Devices Inc./Maxim Integrated MAX1029ACEP

Overview

MAX1029ACEP from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1.2°C error over –40°C to +85°C), internal 2.5V reference (±30ppm/°C TC), and 16-entry FIFO. It supports 12 single-ended or 6 true differential input channels in unipolar/bipolar modes, operates from a single +3V supply, and interfaces via 10MHz SPI/QSPI/MICROWIRE. It is used in industrial control systems for multichannel voltage and on-chip temperature monitoring.

For engineers reviewing the MAX1029ACEP datasheet, MAX1029ACEP pinout, MAX1029ACEP application, or MAX1029ACEP equivalent, key selection considerations include its 12-channel analog multiplexer configuration, internal FIFO buffering for burst acquisition, AutoShutdown™ power management, and compatibility with low-power embedded microcontroller interfaces requiring precise thermal-aware data acquisition.

Technical Context

The MAX1029ACEP implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both single-ended and true differential inputs. Its internal oscillator enables autonomous conversion timing in clock modes 00, 01, and 10, while external SCLK up to 10MHz drives mode 11 for maximum 300ksps sampling.

It integrates an on-die temperature sensor with 1/8°C resolution and two's-complement output, always referenced to its internal 2.5V reference. The 16-deep FIFO stores mixed voltage and temperature results, enabling background acquisition without serial bus contention-critical for real-time system supervision where latency and interrupt load must be minimized.

Key Specifications

Pinout & Package

MAX1029ACEP is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with gull-wing leads. The exposed pad is absent-this is a plastic SOP variant, not TQFN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7953IRHBT and AD7923BRUZ, the MAX1029ACEP uniquely integrates FIFO buffering, on-die temperature sensing, and internal reference in a 20-pin QSOP-reducing component count and firmware overhead for compact, thermally aware data acquisition where 10-bit resolution suffices.

Availability

MAX1029ACEP is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, data-acquisition front-ends, and embedded system supervision requiring stable component supply across extended temperature ranges.

Supply support for MAX1029ACEP 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, automotive, and healthcare applications.

The MAX1027/MAX1029/MAX1031 family was engineered for low-power, multichannel data acquisition in space-constrained systems requiring integrated thermal awareness and minimal external components.

FAQ

What is the operating temperature range specified for the MAX1029ACEP?

The MAX1029ACEP is rated for operation from –40°C to +85°C, matching the extended industrial temperature grade denoted by the "E" in its part number suffix. This range applies to all electrical specifications including INL, DNL, temperature sensor accuracy (±1.2°C), and supply current performance. The device maintains full functionality across this range without derating.

Does the MAX1029ACEP require an external reference, or does it have an internal one?

The MAX1029ACEP includes a factory-trimmed internal 2.5V reference with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient. It can operate fully autonomously using this reference. An external differential reference (0–500mV on REF–, 1.0V–VDD+50mV on REF+) may be substituted, but the internal reference remains mandatory for temperature measurements.

How many analog input channels does the MAX1029ACEP support, and what configurations are available?

The MAX1029ACEP supports 12 single-ended analog inputs (AIN0–AIN11) or 6 true differential pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7, AIN8/AIN9, AIN10/AIN11). Configuration is controlled via the setup register; each pair can be independently set to unipolar or bipolar mode, with output format (binary or two's complement) automatically determined by mode selection.

What is the purpose and capacity of the FIFO in the MAX1029ACEP?

The MAX1029ACEP contains a 16-deep FIFO that stores complete 16-bit conversion results - up to 16 voltage samples or a mix including one temperature reading. This allows the ADC to perform background acquisitions (e.g., scanning all 12 channels) without blocking the SPI bus, enabling the host MCU to service other tasks while data accumulates for batch readout.

Can the MAX1029ACEP perform simultaneous sampling across multiple channels?

No, the MAX1029ACEP does not support simultaneous sampling. It uses a single SAR core with a multiplexed analog front-end, performing sequential conversions per channel in scan mode. However, its fast 3.5μs acquisition time and FIFO enable tightly spaced sampling (e.g., 12 channels in <50μs total), which is sufficient for most industrial and biomedical monitoring where inter-channel skew under 100ns is not required.