Analog Devices Inc./Maxim Integrated MAX1292BEEG

Overview

MAX1292BEEG from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, software-configurable 4-channel single-ended or 2-channel pseudo-differential analog input, byte-wide parallel (8+4) interface, and internal track/hold. It operates from a single +5V analog supply with independent +2.7V to +5.5V digital logic supply (VLOGIC), enabling direct interfacing with mixed-voltage microcontrollers in portable data-acquisition systems.

For engineers reviewing the MAX1292BEEG datasheet, MAX1292BEEG pinout, MAX1292BEEG application, or MAX1292BEEG equivalent, this page delivers verified electrical parameters, validated 24-pin QSOP package mapping, confirmed timing behavior (400ksps max sampling, 3.2µs conversion time), real-world power-down current (2µA shutdown), and two rigorously cross-checked alternative ADCs for industrial sensor interfaces and battery-powered instrumentation.

Technical Context

The MAX1292BEEG implements a charge-redistribution SAR architecture with an internal 6MHz full-power bandwidth track-and-hold stage, supporting both internal and external clock modes via control bits D6/D7. Its analog input multiplexer supports unipolar/bipolar and single-ended/pseudo-differential configurations through software-selectable control bytes.

Conversion is initiated by WR pulses under CS enable, with interrupt-driven readout via active-low INT and three-state parallel data bus (D0–D11) managed by HBEN for high-byte/low-byte multiplexing. Power management includes two software-selectable power-down modes reducing supply current to <10µA between conversions at reduced sampling rates.

Key Specifications

Pinout & Package

MAX1292BEEG is housed in a 24-pin QSOP package (5.0mm × 7.5mm body, 0.635mm pitch), optimized for space-constrained PCB layouts in medical and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1292BEEG, ADS7822U sacrifices 4-bit resolution and parallel speed for lower cost and simpler layout, while MAX1162BCAP retains 12-bit accuracy but replaces the byte-wide interface with SPI-requiring firmware adaptation and losing deterministic 3.2µs conversion latency.

Availability

MAX1292BEEG is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and energy metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1292BEEG 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 MAX1290/MAX1292 product line delivers low-power, high-accuracy ADCs with integrated references and flexible digital interfaces for space- and power-constrained data-acquisition systems.

FAQ

What is the operating temperature range for MAX1292BEEG?

The MAX1292BEEG is rated for operation from -40°C to +85°C, as indicated by the 'E' suffix in its part number. This extended industrial temperature range ensures reliable performance in harsh environments such as factory automation equipment, outdoor energy meters, and portable medical devices where ambient temperatures fluctuate widely. The device maintains specified INL (±1 LSB), gain error (±4 LSB), and reference stability (±2ppm/°C) across this full range.

Does MAX1292BEEG require an external clock to operate?

No, MAX1292BEEG supports both internal and external clock modes. When configured for internal clock mode (control bits D7=1, D6=0), it generates its own 7.6MHz clock internally-eliminating the need for an external oscillator and simplifying system design. The CLK pin must be tied to VDD or GND in this mode to prevent floating. External clock mode (D7=1, D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals for precise timing control in synchronized multi-ADC systems.

How does the HBEN pin function in MAX1292BEEG's parallel interface?

The HBEN (High-Byte Enable) pin on MAX1292BEEG controls multiplexing of the 12-bit conversion result across the 8-bit data bus: when HBEN = 1, D0–D3 carry the four MSBs (D8–D11); when HBEN = 0, D0–D7 carry the eight LSBs (D0–D7). This allows standard 8-bit microcontrollers to read the full 12-bit result in two consecutive cycles without requiring wider data paths or additional address lines-reducing PCB complexity and pin count.

Can MAX1292BEEG interface directly with a 3.3V microcontroller?

Yes, MAX1292BEEG can interface directly with 3.3V microcontrollers via its VLOGIC pin, which accepts +2.7V to +5.5V digital supply voltage. Setting VLOGIC = 3.3V configures all digital outputs (INT, D0–D11) to 3.3V logic levels and ensures input thresholds (VIH = 2.0V min, VIL = 0.8V max) are compatible with 3.3V µP outputs. This eliminates level-shifter ICs and reduces power consumption compared to 5V-only ADCs.

What is the minimum acquisition time required before conversion starts in MAX1292BEEG?

The MAX1292BEEG specifies a maximum acquisition time (tACQ) of 3.6µs under typical conditions (fCLK = 7.6MHz, internal acquisition mode). This value represents the worst-case duration the track-and-hold circuit needs to settle before conversion begins. For source impedances ≤3kΩ, no additional external settling time is required. Higher source impedances necessitate longer acquisition intervals-calculated as tACQ = 9 × (RS + 800Ω) × 12pF-to maintain full 12-bit accuracy without missing codes.