Analog Devices Inc./Maxim Integrated MAX1296BEEG+

Overview

MAX1296BEEG+ from Maxim Integrated is a low-power, 12-bit successive-approximation ADC with internal +2.5V reference, 420ksps sampling rate, and parallel 12-bit interface. It operates from a single +5V analog supply, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential input modes, and delivers ±0.5 LSB INL over –40°C to +85°C - ideal for portable patient monitoring and industrial data-logging systems where space and battery life are constrained.

For engineers reviewing the MAX1296BEEG+ datasheet, MAX1296BEEG+ pinout, MAX1296BEEG+ application, or MAX1296BEEG+ equivalent, key selection considerations include its 2-channel single-ended / 1-channel pseudo-differential analog multiplexer, 2.8mA active current at full speed, 2µA shutdown current, QSOP-24 package footprint, and compatibility with microprocessor parallel buses without external clock generation.

Technical Context

The MAX1296BEEG+ implements a charge-redistribution SAR architecture with integrated track/hold (6MHz full-power bandwidth), internal bandgap reference buffer, and configurable acquisition timing (internal or external). Its control byte (D7–D0) directly selects channel (CH0/CH1), input mode (SGL/DIF), polarity (UNI/BIP), acquisition method (ACQMOD), and power-down state (PD1/PD0).

Conversion timing is deterministic: 13 clock cycles per conversion, with tCONV = 3.2µs in internal clock mode and adjustable via external fCLK (100kHz–7.6MHz). The device tri-states INT on CS high and supports three-state D0–D11 outputs synchronized to RD, enabling clean bus sharing in multi-peripheral µP systems.

Key Specifications

Pinout & Package

MAX1296BEEG+ is housed in a 24-pin QSOP (Quad Small Outline Package) with 0.635mm pitch, JEDEC MS-013 compliant, and rated for –40°C to +85°C operation. Thermal pad not present; standard solder profile applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1296AEEG+, the MAX1296BEEG+ trades ±1 LSB gain stability for broader availability and lower unit cost, while ADS7822U sacrifices resolution, parallel interface, and internal reference to reduce BOM count - making MAX1296BEEG+ optimal for mid-tier portable instrumentation needing balanced performance, integration, and supply chain resilience.

Availability

MAX1296BEEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, and energy metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1296BEEG+ 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 MAX1294/MAX1296 family targets battery-powered and space-constrained data-acquisition systems requiring high-resolution conversion without external clocks or references - emphasizing low quiescent current, software configurability, and robust AC performance.

FAQ

What is the maximum sampling rate of the MAX1296BEEG+ and under what conditions is it achieved?

The MAX1296BEEG+ achieves a maximum sampling rate of 420ksps when operating in internal clock mode with fCLK = 6MHz and VDD = +5V. This rate assumes continuous conversion with no inter-sample delays, and requires the internal track/hold to settle within the 3.2µs conversion time. At lower supply voltages or elevated temperatures, the achievable rate may decrease due to increased aperture jitter and reduced drive strength.

Does the MAX1296BEEG+ require an external clock source, or can it operate autonomously?

The MAX1296BEEG+ can operate autonomously using its internal 6MHz clock when D7=1 and D6=0 in the control byte - eliminating need for external clock generation. In this mode, the CLK pin must be tied to VDD or GND to prevent floating. External clock mode (D7=D6=1) supports frequencies from 100kHz to 7.6MHz and is required for sub-50ps aperture jitter in precision sampling applications.

How many analog input channels does the MAX1296BEEG+ support, and how are they configured?

The MAX1296BEEG+ supports two analog input channels (CH0 and CH1) in single-ended mode, or one pseudo-differential channel (CH0–CH1 pair) when SGL/DIF = 0. Channel selection is controlled by A2–A0 bits in the control byte, though only A1/A0 are used (A2 is ignored). COM serves as the reference node and must be stabilized to ±0.5 LSB during conversion.

What power-down modes are available on the MAX1296BEEG+, and what are their typical current draws?

The MAX1296BEEG+ offers two software-selectable power-down modes: Standby (2µA typical) and Full Power-Down (2µA typical). Both are activated via PD1/PD0 bits in the control byte. In Standby, the reference remains active but the T/H and digital core are disabled; in Full Power-Down, both reference and T/H are shut down. Wake-up time is 2µs in either mode.

Is the internal +2.5V reference on the MAX1296BEEG+ ratiometric to VDD, and how stable is it over temperature?

No, the internal +2.5V reference on the MAX1296BEEG+ is bandgap-derived and independent of VDD - it maintains 2.49V to 2.51V from –40°C to +85°C with ±20ppm/°C temperature coefficient. This non-ratiometric behavior ensures consistent full-scale code alignment even if VDD varies within its 4.5V–5.5V specification, critical for absolute measurement accuracy in standalone sensor nodes.