Analog Devices Inc./Maxim Integrated MAX1113EPE+

Overview

The MAX1113EPE+ from Maxim Integrated is an 8-bit, 4-channel analog-to-digital converter (ADC) with internal track/hold, 4.096V reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar single-ended/differential input modes. It operates from a single 4.5V–5.5V supply, draws only 135µA at 50ksps, and supports up to 50ksps sampling in external clock mode - ideal for portable data loggers and hand-held measurement devices.

For engineers reviewing the MAX1113EPE+ datasheet, MAX1113EPE+ pinout, MAX1113EPE+ application, or MAX1113EPE+ equivalent, key selection considerations include its 16-pin QSOP package, 4-channel differential capability (CH0/CH1, CH2/CH3), ±1 LSB total unadjusted error, 1µs minimum acquisition time, and SHDN-controlled 10µA power-down mode.

Technical Context

The MAX1113EPE+ uses successive-approximation register (SAR) architecture with integrated track/hold and programmable clock source (internal or external). Its analog front-end supports pseudo-differential sampling via configurable channel pairs and accepts input ranges from 0V to VREFIN (unipolar) or ±VREFIN/2 (bipolar), with COM pin establishing common-mode reference.

Conversion timing is tightly coupled to serial interface operation: in external clock mode, 10 SCLK cycles complete one conversion (including control byte and 8-bit result); in internal clock mode, SSTRB asserts low for ~25µs while conversion runs autonomously, enabling flexible host read timing up to 2MHz SCLK.

Key Specifications

Pinout & Package

The MAX1113EPE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for compact PCB layouts in portable instrumentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit multi-channel ADC applications.

Compared with ADS7822U, the MAX1113EPE+ integrates reference and track/hold to reduce BOM count and layout complexity; compared with MAX1110EPE+, it trades channel count for lower power per channel and tighter thermal profile in space-constrained designs.

Availability

The MAX1113EPE+ is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and medical instruments requiring stable component supply across industrial temperature ranges (−40°C to +85°C).

Supply support for MAX1113EPE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX1112/MAX1113 family was designed for ultra-low-power, multi-channel data acquisition in battery-operated and space-constrained systems - emphasizing integration of reference, track/hold, and serial interface in minimal footprint packages.

FAQ

What is the maximum sampling rate supported by the MAX1113EPE+?

The MAX1113EPE+ supports up to 50ksps when using an external 500kHz serial clock in external clock mode. In internal clock mode, conversion completes in ~25µs, allowing host readout at up to 2MHz SCLK - though effective throughput remains limited by the 50ksps analog sampling constraint. The MAX1113EPE+ achieves this rate while maintaining ±1 LSB total unadjusted error and 49dB SINAD performance.

How does the MAX1113EPE+ handle differential input configurations?

The MAX1113EPE+ supports two differential input pairs: CH0/CH1 and CH2/CH3. In differential mode, the device performs pseudo-differential sampling where IN+ is sampled and IN− serves as a stable common-mode reference. The COM pin must remain within ±0.5 LSB of target voltage, and best results require a 0.1µF capacitor from IN− to AGND. Differential input range is 0V to VREFIN (unipolar) or ±VREFIN/2 (bipolar), configured via the SGL/DIF and UNI/BIP bits in the control byte.

Can the MAX1113EPE+ operate without an external reference?

Yes, the MAX1113EPE+ includes a precision 4.096V internal reference accessible at the REFOUT pin. When REFIN is connected to REFOUT, the device operates fully autonomously with no external components. The internal reference exhibits ±0.4mV typical drift and requires a 1µF ceramic capacitor to AGND for stability. External references from 1V to VDD are also supported by connecting them directly to REFIN, disabling the internal reference.

What power-saving modes does the MAX1113EPE+ offer?

The MAX1113EPE+ provides two independent power-saving mechanisms: software-controlled power-down (13µA at 1ksps) activated via PD1/PD0 bits in the control byte, and hardware SHDN pin control (10µA max) that forces deep shutdown. Pulling SHDN low disables all circuitry except the input buffer; pulling it high disables only the internal reference. Both modes retain configuration state, and the device wakes instantly upon CS assertion or SHDN transition, with 1µs minimum acquisition time.

Is the MAX1113EPE+ compatible with standard microcontroller SPI peripherals?

Yes, the MAX1113EPE+ is fully compatible with standard SPI peripherals when configured with CPOL = 0 and CPHA = 0. It uses a 4-wire interface (CS, SCLK, DIN, DOUT) and supports SPI, QSPI, and MICROWIRE protocols. Data is clocked in on SCLK rising edge and out on falling edge, MSB-first. Each conversion requires transmission of an 8-bit control byte followed by reading two bytes containing the 8-bit result aligned to bits D7–D0 of the second byte.