Analog Devices Inc./Maxim Integrated MAX1082BEUE+T

Overview

MAX1082BEUE+T from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with internal +2.5V reference, 400ksps sampling rate, and single +4.5V to +5.5V supply operation. It integrates a track/hold amplifier, software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface - deployed in portable data loggers and battery-powered medical instruments.

For engineers reviewing the MAX1082BEUE+T datasheet, MAX1082BEUE+T pinout, MAX1082BEUE+T application, or MAX1082BEUE+T equivalent, key selection considerations include its ±1 LSB INL over –40°C to +85°C, 2.5mA typical supply current at 400ksps, 16-pin TSSOP package, and support for automatic power-down after conversion.

Technical Context

The MAX1082BEUE+T uses successive-approximation register (SAR) architecture with integrated track-and-hold, enabling precise sampling of up to four analog inputs per conversion cycle. Its input multiplexer supports both single-ended (CH0–CH3 vs. COM) and pseudo-differential (CH0/CH1, CH2/CH3) configurations, with COM serving as zero-code reference.

Conversion is clocked externally via SCLK (up to 6.4MHz), with timing tightly coupled to serial interface operation: control byte entry initiates acquisition, and 12 SCLK falling edges deliver the 10-bit result plus 2 sub-LSB bits. The internal reference buffer provides ±1.5% adjustment range via REFADJ, and full power-down mode draws only 2µA.

Key Specifications

Pinout & Package

MAX1082BEUE+T is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit, multi-channel serial ADC applications.

Compared with ADS7822U and MAX11131ETE+, the MAX1082BEUE+T uniquely balances 10-bit accuracy, 400ksps speed, 5V compatibility, and integrated reference in a drop-in-capable TSSOP footprint - making it optimal for industrial and portable designs needing proven performance without reference design overhead.

Availability

MAX1082BEUE+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1082BEUE+T 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 MAX1082/MAX1083 family was designed specifically for space-constrained, battery-sensitive systems requiring multi-channel data acquisition with minimal external components - emphasizing integration, low power, and robust serial interfacing.

FAQ

What is the guaranteed INL specification for MAX1082BEUE+T across its full temperature range?

The MAX1082BEUE+T guarantees ±1 LSB integral nonlinearity over its specified operating temperature range of –40°C to +85°C. This is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet, distinguishing it from the ±1/2 LSB grade (e.g., MAX1082AEUE+) and aligning with its "B" grade designation. This level of linearity ensures consistent measurement fidelity in industrial and medical deployments where calibration stability is critical.

Does MAX1082BEUE+T support true differential input mode, or is it pseudo-differential only?

The MAX1082BEUE+T supports pseudo-differential input mode only - not true differential. In this mode, only the positive input (IN+) is actively sampled; the negative input (IN–) is held stable (e.g., at COM or VREF/2) during conversion. The device offers CH0/CH1 and CH2/CH3 as paired channels for pseudo-differential use, but both inputs are not simultaneously sampled. True differential operation would require independent sampling of both nodes, which the MAX1082BEUE+T architecture does not provide.

Can MAX1082BEUE+T operate with an external reference voltage, and what is the valid input range?

Yes, MAX1082BEUE+T can operate with an external reference applied to the REF pin. To disable the internal reference buffer, REFADJ must be tied to VDD1. The valid external reference range is 1V to VDD (i.e., +4.5V to +5.5V), as specified in the Electrical Characteristics table. Using a reference below 2.5V degrades ADC performance due to increased noise floor impact, and the device's full-scale range scales linearly with the applied reference voltage.

What is the minimum acquisition time (tACQ) required for MAX1082BEUE+T at maximum sampling rate?

The minimum acquisition time (tACQ) for MAX1082BEUE+T is 400ns, as specified under Dynamic Specifications at 400ksps operation. This value assumes a source impedance ≤4kΩ and is measured from the falling SCLK edge after the eighth control bit. Longer acquisition times may be needed for higher source impedances, calculated as tACQ = 7 × (RS + 800Ω) × 18pF - but 400ns is the guaranteed floor for full-speed operation with low-impedance drivers.

How does the SHDN pin interact with the software-controlled power-down modes in MAX1082BEUE+T?

The SHDN pin on MAX1082BEUE+T provides hardware-initiated full power-down (FULLPD), reducing supply current to 2µA regardless of software state. It operates independently of the PD0/PD1 bits in the control byte: pulling SHDN low forces immediate FULLPD, overriding any active software power mode. When SHDN is high, the device obeys software-selected modes (NORMAL, REDP, FASTPD, FULLPD). Releasing SHDN returns the device to the last software-selected mode, not necessarily NORMAL.