Analog Devices Inc./Maxim Integrated MAX1264BCEG+

Overview

MAX1264BCEG+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated +2.5V reference, byte-wide parallel (8+4) interface, and software-configurable 4-channel single-ended or 2-channel pseudo-differential analog input. 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 MAX1264BCEG+ datasheet, MAX1264BCEG+ pinout, MAX1264BCEG+ application, or MAX1264BCEG+ equivalent, this page delivers verified electrical specifications, validated pin functions, confirmed operating modes (unipolar/bipolar, internal/external clock/acquisition), real-world power consumption data across sampling rates (2.5mA at 400ksps, 2µA in shutdown), and precise package mapping to 24-pin QSOP.

Technical Context

The MAX1264BCEG+ implements a charge-redistribution SAR architecture with an internal track-and-hold (T/H) stage offering 6MHz full-power bandwidth and 350kHz full-linear bandwidth. Its control logic accepts an 8-bit configuration byte defining channel selection (A2–A0), unipolar/bipolar mode (UNI/BIP), single-ended/pseudo-differential mode (SGL/DIF), acquisition mode (ACQMOD), and power-down state (PD1/PD0).

Conversion timing is deterministic: 13 clock cycles per conversion, with aperture delay of 25ns and acquisition time of 3.2µs (typ). The device supports two clock modes - internal (CLK tied to VDD/GND, 3.6µs conversion) and external (7.6MHz max, 50% duty cycle) - and two acquisition modes, enabling precise sampling control or simplified µP-driven operation.

Key Specifications

Pinout & Package

MAX1264BCEG+ is housed in a 24-pin QSOP package (5.0mm × 7.5mm, 0.635mm pitch), optimized for high-density PCB layouts in portable instrumentation and embedded controllers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11100ETE+, the MAX1264BCEG+ uniquely combines 12-bit accuracy, byte-wide parallel interface, integrated +2.5V reference, and 24-pin QSOP packaging - making it optimal for µP-based systems prioritizing ease of interface, minimal BOM count, and proven industrial temperature reliability.

Availability

MAX1264BCEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital signs acquisition, energy meter data logging, and touch screen controller interface requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1264BCEG+ 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 MAX126x family was designed specifically for low-power, high-accuracy data-acquisition systems requiring integrated references and flexible input configurations - targeting portable instrumentation, medical monitors, and automated test equipment.

FAQ

What is the maximum sampling rate supported by the MAX1264BCEG+?

The MAX1264BCEG+ supports a maximum sampling rate of 400ksps under standard conditions (VDD = VLOGIC = +5V, fCLK = 7.6MHz). This rate is achievable in external clock mode with internal acquisition, delivering 13-clock-cycle conversions. At lower rates (e.g., 100ksps), supply current drops to 1.0mA, and at 10ksps, it falls to 400µA - enabling adaptive power scaling in battery-operated systems. The MAX1264BCEG+ maintains ±0.5 LSB INL across its full sampling range.

Does the MAX1264BCEG+ require an external reference voltage?

No, the MAX1264BCEG+ does not require an external reference voltage because it integrates a precision +2.5V bandgap reference with ±10mV initial accuracy and ±2ppm/°C temperature coefficient. The REF pin delivers this voltage directly, and REFADJ allows disabling the internal reference when an external source is preferred. Using the internal reference eliminates two external components (reference IC and decoupling cap), reducing BOM cost and PCB area - a key advantage confirmed in the device's typical operating characteristics (Figure toc10/toc11).

How many analog input channels does the MAX1264BCEG+ support in single-ended mode?

The MAX1264BCEG+ supports four analog input channels (CH0–CH3) in single-ended mode, as explicitly defined in the Pin Configurations diagram and Feature list. In pseudo-differential mode, it supports two channel pairs (CH0/CH1 and CH2/CH3). This 4-channel count distinguishes it from the pin-compatible MAX1262 (8-channel), and is validated by the MAX1264-specific simplified input structure (Figure 3b) and ordering information table confirming the 24-pin QSOP package.

What is the function of the HBEN pin on the MAX1264BCEG+?

The HBEN (High Byte Enable) pin on the MAX1264BCEG+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus (D0–D7). When HBEN = 1, the four most significant bits (D8–D11) appear on D0–D3; when HBEN = 0, the eight least significant bits (D0–D7) are presented. This design allows full 12-bit readout using only 8 data lines - a critical feature for legacy 8-bit microcontrollers or space-constrained designs where adding four extra I/O lines is impractical.

Can the MAX1264BCEG+ operate with a 3.3V digital supply?

Yes, the MAX1264BCEG+ can operate with a 3.3V digital supply applied to the VLOGIC pin, as specified in the Absolute Maximum Ratings and Features sections. VLOGIC accepts +2.7V to +5.5V, allowing direct interfacing with 3.3V microcontrollers without level shifters. Digital inputs (CS, WR, RD, CLK, HBEN) recognize VIH ≥ 2.0V and VIL ≤ 0.8V at VLOGIC = 3.3V, and outputs drive VOH ≥ 2.8V and VOL ≤ 0.4V - ensuring robust noise margins. This capability is confirmed in the Electrical Characteristics table (Digital Inputs and Outputs section).