Analog Devices Inc./Maxim Integrated MAX1276CTC+

Overview

MAX1276CTC+ from Maxim Integrated is a 12-bit, true-differential, serial-output analog-to-digital converter (ADC) with internal 4.096V reference, 1.8Msps sampling rate, ±1.25 LSB INL, and single +4.75V to +5.25V supply operation. It features partial/full power-down modes (2mA typ / 1µA max), SPI/QSPI/MICROWIRE-compatible 3-wire interface, and is optimized for high-accuracy industrial data acquisition and motor control systems.

For engineers reviewing the MAX1276CTC+ datasheet, MAX1276CTC+ pinout, MAX1276CTC+ application, or MAX1276CTC+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the MAX1276CTC+ variant.

Technical Context

The MAX1276CTC+ employs a successive-approximation register (SAR) architecture with an internal true-differential track-and-hold (T/H), enabling noise-immune sampling of unipolar differential inputs (0 to V_REF). Its conversion timing is fully synchronous to SCLK, requiring exactly 16 clock cycles per 12-bit result with no pipeline delay.

It integrates a trimmed 4.096V bandgap reference active in normal and partial power-down modes but disabled in full power-down mode-requiring ≥2ms recovery before valid conversion. The separate VL supply (1.8V to V_DD) enables direct interfacing with low-voltage digital logic while maintaining analog performance.

Key Specifications

Pinout & Package

The MAX1276CTC+ is housed in a 12-pin 3mm × 3mm TQFN package with exposed paddle (EP), rated for -40°C to +85°C operation. Pin 1 is AIN-, pin 12 is AIN+, and EP is internally connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and AD7476ARTZ-REEL7, the MAX1276CTC+ uniquely combines true-differential input, integrated 4.096V reference, and 1.8Msps throughput in a single 12-pin TQFN-reducing system-level component count and layout complexity for precision industrial sensing.

Availability

MAX1276CTC+ is available at Aetrix Electronics and suitable for industrial process control, motor control, and portable instrumentation requiring stable component supply, extended temperature operation (-40°C to +85°C), and RoHS-compliant packaging.

Supply support for MAX1276CTC+ 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, automotive, and communications applications.

The MAX1276CTC+ belongs to Maxim's high-speed, low-power SAR ADC product line, engineered specifically for applications needing true-differential input fidelity, integrated reference stability, and minimal power consumption in compact form factors.

FAQ

What is the input voltage range for the MAX1276CTC+?

The MAX1276CTC+ accepts a true-differential unipolar input range of 0V to V_REF (0V to 4.096V) between AIN+ and AIN-. Absolute input voltage on each pin must remain within 0V to V_DD (4.75V to 5.25V). This range is fixed by the internal reference and cannot be scaled externally without additional circuitry.

Does the MAX1276CTC+ require an external reference?

No, the MAX1276CTC+ does not require an external reference-it integrates a factory-trimmed 4.096V bandgap reference accessible at the REF pin. This reference remains enabled in normal and partial power-down modes, and is disabled only in full power-down mode, requiring ≥2ms settling time upon exit.

How many clock cycles are needed to read a full conversion from the MAX1276CTC+?

A full 12-bit conversion from the MAX1276CTC+ requires exactly 16 SCLK rising edges: the first 3 bits are leading zeros, followed by the 12 data bits in MSB-first order. Data appears on DOUT starting at the 4th SCLK rising edge and remains valid for t_DHOLD (4ns) after the next rising edge.

What is the purpose of the RGND pin on the MAX1276CTC+?

The RGND pin on the MAX1276CTC+ serves as the dedicated reference ground return for the internal 4.096V reference and analog input circuitry. It must be connected directly to the system's main analog ground (GND) with minimal impedance-separating reference return from digital or power ground paths prevents noise coupling into the ADC's reference node.

Can the MAX1276CTC+ interface directly with a 1.8V microcontroller?

Yes, the MAX1276CTC+ can interface directly with a 1.8V microcontroller via its VL pin, which accepts 1.8V to V_DD. When VL = 1.8V, digital inputs (SCLK, CNVST) recognize logic high at ≥1.26V and logic low at ≤0.54V, and DOUT drives VOH ≥1.3V and VOL ≤0.4V-fully compatible with standard 1.8V CMOS I/O thresholds.