Analog Devices Inc./Maxim Integrated MAX1296BCEG+

Overview

MAX1296BCEG+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, 2-channel single-ended / 1-channel pseudo-differential input multiplexer, parallel 12-bit interface, and 420ksps maximum sampling rate. It operates from a single +5V supply and delivers ±0.5 LSB integral nonlinearity at 0°C to +70°C, targeting precision data acquisition in space-constrained industrial and medical systems.

For engineers reviewing the MAX1296BCEG+ datasheet, MAX1296BCEG+ pinout, MAX1296BCEG+ application, or MAX1296BCEG+ equivalent, key selection considerations include its 24-pin QSOP package, software-configurable unipolar/bipolar input mode, 2.8mA active current at full speed, internal track/hold with 6MHz full-power bandwidth, and tri-state parallel interface timing compatibility with standard microprocessors.

Technical Context

The MAX1296BCEG+ implements a charge-redistribution SAR architecture with an on-chip 12-bit capacitive DAC and internal 6MHz track/hold amplifier. Its control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), power-down state (full/standby), input polarity (unipolar/bipolar), and channel selection (CH0/CH1).

It supports two distinct analog input configurations: single-ended (IN+ = CH0 or CH1, IN− = COM) and pseudo-differential (IN+ = CH0, IN− = CH1), where only the positive input is sampled while the negative input must remain stable within ±0.5 LSB. Conversion time is fixed at 3.2µs (13 clock cycles) in all modes, with aperture jitter as low as 50ps in external acquisition mode.

Key Specifications

Pinout & Package

MAX1296BCEG+ is housed in a 24-pin QSOP (Quad Small Outline Package) with 0.635mm pitch, JEDEC MS-013AC compliant. Pin 1 is marked by a dot or beveled corner; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1296ACEG+, the MAX1296BCEG+ trades guaranteed linearity tolerance for lower cost in commercial-temperature applications; versus ADS7822U, it provides faster parallel throughput and integrated reference at the expense of larger package and pin count.

Availability

MAX1296BCEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touchscreen controller interfaces requiring stable component supply and long-term manufacturability.

Supply support for MAX1296BCEG+ 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 markets.

The MAX1294/MAX1296 family was designed for low-power, high-accuracy data acquisition in space-constrained systems requiring integrated reference and simple µP interfacing - emphasizing ease of use without sacrificing dynamic performance.

FAQ

What is the operating temperature range for MAX1296BCEG+?

The MAX1296BCEG+ is specified for operation from 0°C to +70°C. This commercial-grade temperature range is validated per the device's ordering code 'C' suffix and applies to all electrical parameters including ±1 LSB integral nonlinearity, 420ksps sampling rate, and 2.8mA supply current. Designs requiring extended temperature operation should consider the MAX1296BEEG+ variant (-40°C to +85°C).

Does MAX1296BCEG+ require an external clock source?

No - the MAX1296BCEG+ supports both internal and external clock modes. When configured for internal clock (D7=1, D6=0), it generates its own 7.6MHz clock, eliminating external timing components. The CLK pin must be tied high or low in this mode to prevent floating. External clock mode (D7=1, D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals for precise timing control.

How many analog input channels does MAX1296BCEG+ support?

The MAX1296BCEG+ supports two analog input channels: CH0 and CH1. In single-ended mode, each can be selected independently as the positive input (IN+) with COM as the reference. In pseudo-differential mode, it measures the voltage difference between CH0 and CH1 - one differential pair only, unlike the 6-channel MAX1294.

Can MAX1296BCEG+ operate with a 3.3V microprocessor interface?

Yes - the MAX1296BCEG+ digital I/O pins (D0–D11, RD, WR, CS, INT) are CMOS-compatible and tolerate 3.3V logic levels when driven by a 3.3V µP, provided VDD remains at +5V. Input thresholds (VIH = 4.0V min, VIL = 0.8V max) ensure reliable recognition of 3.3V-high signals. Output VOH (≥4.5V) may require level-shifting for safe interfacing to 3.3V-only inputs.

What is the purpose of the COM pin on MAX1296BCEG+?

The COM pin on MAX1296BCEG+ serves as the common-mode reference for analog inputs. In single-ended mode, it sets the zero-code voltage (e.g., 0V for unipolar, +1.25V for bipolar). In pseudo-differential mode, it is not used - instead, CH1 becomes the negative input. COM must remain stable to ±0.5 LSB during conversion; a low-impedance source or local 0.1µF bypass is recommended.