Analog Devices Inc./Maxim Integrated MAX1293BEEG+

Overview

MAX1293BEEG+ from Maxim Integrated is a 12-bit, 250ksps 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 multiplexer, and byte-wide parallel (8+4) interface. It operates from a single +3V analog supply and supports digital logic levels from +1.8V to +3.6V via VLOGIC, enabling direct interfacing with low-voltage microcontrollers in portable data-acquisition systems.

For engineers reviewing the MAX1293BEEG+ datasheet, MAX1293BEEG+ pinout, MAX1293BEEG+ application, or MAX1293BEEG+ equivalent, key selection considerations include its 250ksps sampling rate with 3MHz full-power bandwidth, ±0.5 LSB INL at 0°C to +85°C, internal track/hold acquisition time of 3.2µs, and dual power-down modes reducing current to 2µA - all in a compact 24-pin QSOP package rated for industrial temperature range.

Technical Context

The MAX1293BEEG+ implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track/hold stage and on-chip 12-bit capacitive DAC. Its control logic accepts an 8-bit configuration byte defining acquisition mode (internal/external), clock source (internal/external), unipolar/bipolar range, and single-ended/pseudo-differential input selection.

Conversion timing is deterministic: 13 clock cycles per conversion, with internal clock mode delivering 3.6µs conversion time and external clock mode supporting 100kHz–4.8MHz input clocks. The parallel interface uses HBEN to multiplex 12-bit results across D0–D7 (LSBs) and D0/D8–D3/D11 (MSBs), while INT provides conversion-complete interrupt signaling.

Key Specifications

Pinout & Package

MAX1293BEEG+ is housed in a 24-pin QSOP (Quad Small Outline Package) with 0.15mm lead pitch and 7.6mm × 4.9mm body size, 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 MAX1293ACEG+, MAX1293BEEG+ provides guaranteed operation down to -40°C and tighter INL specification; versus ADS7822U, it offers higher throughput, integrated reference, and parallel interface - making it preferable for time-critical, thermally demanding, or reference-sensitive designs.

Availability

MAX1293BEEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, energy metering subsystems, and touchscreen controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1293BEEG+ 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 MAX1293BEEG+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for battery-powered and space-constrained systems needing high resolution, low power, and flexible digital interfacing without external support components.

FAQ

What is the operating temperature range of the MAX1293BEEG+?

The MAX1293BEEG+ is specified for operation from -40°C to +85°C, as confirmed by its "E" grade suffix and ordering information in the datasheet. This extended industrial temperature range ensures reliable performance in harsh environments such as factory floors, outdoor energy meters, and portable medical equipment where ambient temperatures fluctuate widely. The device maintains ±0.5 LSB INL and 12-bit resolution across this full range.

Does the MAX1293BEEG+ require an external clock source?

No, the MAX1293BEEG+ does not require an external clock source. It features an internal oscillator that can be selected via control bits D6/D7 in the configuration byte. When configured for internal clock mode, the device operates at a fixed 3.6µs conversion time without any external timing components. The CLK pin must be tied to VDD or GND in this mode to prevent floating.

How many analog input channels does the MAX1293BEEG+ support?

The MAX1293BEEG+ supports four single-ended analog input channels (CH0–CH3) or two pseudo-differential channel pairs (CH0/CH1 and CH2/CH3), as explicitly stated in the General Description and Pin Configurations sections. This is distinct from the pin-compatible MAX1291, which offers eight single-ended channels. Channel selection is performed entirely in software via the 3-bit address field (A2–A0) in the control byte.

Can the MAX1293BEEG+ interface directly with a 1.8V microcontroller?

Yes, the MAX1293BEEG+ can interface directly with a 1.8V microcontroller using its VLOGIC pin. The datasheet specifies VLOGIC operation from +1.8V to +3.6V, and digital outputs (D0–D7, INT) are fully compatible with 1.8V logic thresholds - VIH(min) = 1.5V and VIL(max) = 0.5V at VLOGIC = 1.8V. This eliminates the need for external level translators in mixed-voltage systems.

What is the purpose of the HBEN pin on the MAX1293BEEG+?

The HBEN (High Byte Enable) pin on the MAX1293BEEG+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus. When HBEN = 1, the four most significant bits (D0/D8–D3/D11) appear on D0–D3; when HBEN = 0, the eight least significant bits (D0–D7) appear on D0–D7. This allows full 12-bit readout using standard 8-bit µP buses without requiring wider data paths or additional address lines.