Analog Devices Inc./Maxim Integrated MAX1262BCEI+

Overview

MAX1262BCEI+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, byte-wide parallel interface (8 + 4), and software-configurable 8-channel single-ended or 4-channel pseudo-differential input. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC. Its 400ksps max sampling rate, 2.5mA active current, and <2µA shutdown current make it suitable for portable patient monitoring and battery-powered data loggers.

For engineers reviewing the MAX1262BCEI+ datasheet, MAX1262BCEI+ pinout, MAX1262BCEI+ application, or MAX1262BCEI+ equivalent, key selection criteria include its ±1 LSB INL at 0°C to +70°C, QSOP-28 package compatibility, internal track-and-hold with 6MHz full-power bandwidth, and support for unipolar/bipolar input configuration without external components.

Technical Context

The MAX1262BCEI+ implements a charge-redistribution SAR architecture with an on-chip track-and-hold stage, enabling precise sampling of fast transients up to 350kHz full-linear bandwidth. Its control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), power-down state, and analog input topology (SGL/DIF, UNI/BIP).

It features dual-supply operation: VDD powers the analog core and internal reference, while VLOGIC independently supplies the 12-bit tri-state parallel interface (D0–D11 multiplexed via HBEN). The REF and REFADJ pins allow seamless switching between internal +2.5V reference and external reference sources, with ±20ppm/°C TCREF and ±100mV REFADJ adjustment range.

Key Specifications

Pinout & Package

MAX1262BCEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for high-density PCB layouts in space-constrained instrumentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.

Compared with MAX1262ACEI+, MAX1262BCEI+ trades 0.5 LSB INL for lower cost while retaining identical timing, power, and interface behavior; compared with ADS7822U, it provides 4× resolution, parallel interface, and 2× sampling rate but requires more PCB area and GPIO resources.

Availability

MAX1262BCEI+ is available at Aetrix Electronics and suitable for patient monitoring, industrial data logging, and energy management systems requiring stable component supply across extended production lifecycles.

Supply support for MAX1262BCEI+ 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 MAX1262BCEI+ belongs to Maxim's low-power, high-accuracy SAR ADC product line, engineered specifically for battery-operated instrumentation where resolution, reference stability, and interface simplicity are critical.

FAQ

What is the operating temperature range for MAX1262BCEI+?

The MAX1262BCEI+ is specified for 0°C to +70°C ambient operation, as indicated by the 'C' grade suffix in its ordering code. This commercial-grade temperature range suits indoor instrumentation, consumer medical devices, and non-automotive industrial controls where extreme thermal stress is absent. The device maintains ±1 LSB INL and all key dynamic specifications across this full range without derating.

Does MAX1262BCEI+ require an external clock source?

No, MAX1262BCEI+ supports both internal and external clock modes. When configured for internal clock (D7=1, D6=0), it generates its own 7.6MHz clock, eliminating external oscillator components. External clock mode (D7=D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals with 30–70% duty cycle, offering precise timing control for synchronized multi-ADC systems.

How does the HBEN pin affect data readout on MAX1262BCEI+?

The HBEN (High-Byte Enable) pin determines which nibble of the 12-bit result appears on the 8-bit data bus: when HBEN = 1, D0–D7 carry D8–D11 (MSB nibble); when HBEN = 0, D0–D7 carry D0–D7 (LSB nibble). Two consecutive reads - first with HBEN high, then low - reconstruct the full 12-bit word, enabling compatibility with 8-bit microprocessor buses.

Can MAX1262BCEI+ operate with a 3.3V digital supply?

Yes, MAX1262BCEI+ supports VLOGIC from +2.7V to +5.5V, making it fully compatible with 3.3V digital systems. Its outputs (D0–D11, INT, RD, WR, CS) swing rail-to-rail relative to VLOGIC, ensuring clean logic levels into 3.3V µPs without level-shifting circuitry. VDD remains fixed at +5V for analog performance, maintaining separation between analog and digital domains.

What is the purpose of the COM pin on MAX1262BCEI+?

The COM pin serves as the analog ground reference for single-ended input mode, defining the zero-code voltage level. In pseudo-differential mode, it functions as the negative input reference for channel pairs. Stability of COM to ±0.5 LSB during conversion is mandatory; it must be decoupled with low-ESR capacitance and routed away from noisy digital traces to prevent degradation of DC accuracy and noise performance in MAX1262BCEI+.