Analog Devices Inc./Maxim Integrated MAX1292BCEG

Overview

MAX1292BCEG from Maxim Integrated is a 12-bit successive-approximation ADC with 4-channel single-ended / 2-channel pseudo-differential analog input, +2.5V internal reference, byte-wide parallel (8+4) interface, and 400ksps max sampling rate. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC, enabling direct interfacing with mixed-voltage microcontrollers in portable data-acquisition systems.

For engineers reviewing the MAX1292BCEG datasheet, MAX1292BCEG pinout, MAX1292BCEG application, or MAX1292BCEG equivalent, this page delivers verified electrical specifications, validated 24-pin QSOP package mapping, confirmed timing behavior (e.g., 3.2µs conversion time, 2µs wake-up), and real-world design context for battery-powered industrial sensing and patient monitoring circuits.

Technical Context

The MAX1292BCEG implements a capacitive charge-redistribution SAR architecture with integrated track-and-hold, supporting both internal and external clock modes (7.6MHz max external clock). Its analog front-end allows software-selectable unipolar/bipolar and single-ended/pseudo-differential configurations via an 8-bit control byte written to the parallel interface.

It features dual power-down modes-standby (1.2mA) and full shutdown (2µA)-triggered by control bits PD0/PD1, with automatic wake-up on CS/WR activity. The internal +2.5V reference exhibits ±2ppm/°C drift and 2.5V ±10mV output accuracy over temperature, while the 6MHz full-power bandwidth enables undersampling of high-frequency transients.

Key Specifications

Pinout & Package

MAX1292BCEG is housed in a 24-pin QSOP (Quad Small Outline Package) with 0.154" body width and 0.025" lead 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 ADC applications.

Compared with ADS7822U and MAX11602EEE+, the MAX1292BCEG uniquely delivers 12-bit parallel interfacing with 400ksps sampling, on-chip +2.5V reference, and software-selectable pseudo-differential operation - making it optimal for high-throughput, space-constrained embedded systems where µP GPIO availability and analog flexibility are critical.

Availability

MAX1292BCEG is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and automated test equipment requiring stable component supply and long-term manufacturability.

Supply support for MAX1292BCEG 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 and mixed-signal ICs for demanding industrial, medical, and communications applications, with emphasis on integration, low power, and reliability.

The MAX1290/MAX1292 family was engineered specifically for battery-powered and space-constrained data-acquisition systems requiring high-resolution analog digitization without external support components.

FAQ

What is the operating temperature range for MAX1292BCEG?

The MAX1292BCEG is specified for commercial-grade operation from 0°C to +70°C, as indicated by the 'C' suffix in its part number. This range covers standard industrial and consumer environments where ambient temperatures remain within typical indoor operating conditions. The device maintains full 12-bit linearity and timing performance across this span, with reference drift limited to ±2ppm/°C and supply current variation under ±10%.

Does MAX1292BCEG require an external clock to operate?

No, the MAX1292BCEG does not require an external clock. It includes an internal 6MHz oscillator that can be enabled via control bits D7/D6 in the configuration byte. When internal clock mode is selected, the CLK pin must be tied to either VDD or GND to prevent floating. External clock operation (100kHz–7.6MHz) is optional and used when precise aperture control or synchronization with system clocks is needed.

How many analog input channels does MAX1292BCEG support in pseudo-differential mode?

The MAX1292BCEG supports exactly two pseudo-differential input channels: CH0/CH1 and CH2/CH3. In this mode, the device measures the voltage difference between each pair, with CH0 or CH2 serving as the positive input and CH1 or CH3 as the stable negative reference. This configuration is explicitly defined in the datasheet's Figure 3b and Table 4, and differs from the MAX1290 which supports four such pairs.

Can MAX1292BCEG interface directly with a 3.3V microcontroller?

Yes, the MAX1292BCEG can interface directly with a 3.3V microcontroller using its VLOGIC pin. By supplying +3.3V to VLOGIC, the device configures its digital outputs (D0–D11, INT, RD, WR, CS, HBEN) to drive 3.3V logic levels with VOH ≥ 2.8V and VOL ≤ 0.4V, meeting standard 3.3V CMOS input thresholds. No level-shifting circuitry is required, simplifying interconnect and improving signal integrity.

What is the minimum acquisition time required before conversion starts?

The minimum acquisition time for the MAX1292BCEG is 3.6µs in internal acquisition mode (typical), as specified in the Electrical Characteristics table. This value assumes a source impedance ≤3kΩ and accounts for the internal T/H settling time. For higher source impedances, acquisition time increases per tACQ = 9(RS + 800Ω) × 12pF, requiring external RC filtering or longer inter-conversion delays to maintain full 12-bit accuracy.