Analog Devices Inc./Maxim Integrated MAX11103ATB+T

Overview

MAX11103ATB+T from Maxim Integrated is a 12-bit, dual-channel, single-ended successive approximation analog-to-digital converter (ADC) with 3 Msps throughput, 72 dB SNR, and 2.2V–3.6V supply operation. It features an external reference input, 3-wire SPI-compatible serial interface, and operates across –40°C to +125°C - ideal for high-precision, low-power portable data acquisition in medical instrumentation and battery-operated systems.

For engineers reviewing the MAX11103ATB+T datasheet, MAX11103ATB+T pinout, MAX11103ATB+T application, or MAX11103ATB+T equivalent, key selection criteria include its 3 Msps conversion rate with no pipeline delay, dual analog inputs with channel-to-channel gain matching of ±0.05 LSB, external reference support, and 10-pin TDFN package with exposed pad for thermal performance.

Technical Context

The MAX11103ATB+T implements a true successive approximation register (SAR) architecture with integrated sample-and-hold, delivering 12-bit resolution without latency or pipeline delay. Its dual 2:1 MUX input structure enables interleaved or independent sampling of two analog signals while maintaining matched DC accuracy (±0.05 LSB gain matching).

It uses a high-speed 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols - supporting up to 48 MHz SCLK - and includes separate OVDD and VDD supplies to decouple digital I/O voltage (1.5V–3.6V) from analog core operation, enabling direct interfacing with mixed-voltage systems.

Key Specifications

Pinout & Package

MAX11103ATB+T is housed in a 10-pin, 3 mm × 3 mm TDFN package with exposed pad (EP) for enhanced thermal dissipation. The package is RoHS-compliant and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and AD7476AARMZ, the MAX11103ATB+T uniquely combines 3 Msps dual-channel sampling, external reference support, and independent OVDD - making it the only option among the three that enables synchronized, low-power, mixed-voltage sensor acquisition without external components.

Availability

MAX11103ATB+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-operated systems requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.

Supply support for MAX11103ATB+T 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 automotive applications.

The MAX111xx family targets high-speed, low-power data acquisition in space- and energy-constrained systems - emphasizing small footprint, wide temperature range, and simplified system integration via flexible I/O and reference architecture.

FAQ

What is the maximum serial clock frequency supported by the MAX11103ATB+T?

The MAX11103ATB+T supports a maximum serial clock (SCLK) frequency of 48 MHz, enabling full 12-bit data readout within 16 clock cycles at 3 Msps throughput. This timing is validated across the full –40°C to +125°C operating range and requires proper setup/hold margins per the datasheet's t2, t4, and t7 specifications.

Does the MAX11103ATB+T require an external reference voltage?

The MAX11103ATB+T supports both external reference operation (via the REF pin) and internal reference derivation from VDD. For highest accuracy and noise immunity - especially in ratiometric sensor applications - an external reference is recommended. The REF pin accepts 1V to (VDD + 0.05V) and exhibits only 0.005 µA leakage during conversion stop.

Can the MAX11103ATB+T interface directly with a 1.8V microcontroller?

Yes. The MAX11103ATB+T's OVDD pin accepts 1.5V–3.6V, allowing direct connection to 1.8V logic without level shifters. Digital inputs (CS, SCLK, CHSEL) recognize VIH ≥ 0.75×OVDD and VIL ≤ 0.25×OVDD, and DOUT drives VOH ≥ 0.85×OVDD and VOL ≤ 0.15×OVDD - fully compliant with 1.8V I/O standards.

What is the channel-to-channel gain matching specification for the MAX11103ATB+T?

The MAX11103ATB+T specifies channel-to-channel gain matching of ±0.05 LSB over temperature, ensuring consistent scaling between AIN1 and AIN2 measurements. This tight matching enables accurate differential-mode computation (e.g., AIN1 – AIN2) without post-processing calibration in applications like bridge sensor readouts.

How does the power-down mode function in the MAX11103ATB+T?

The MAX11103ATB+T enters ultra-low-power shutdown upon deassertion of CS while maintaining OVDD/VDD bias. It draws just 1.3 µA typical leakage current and wakes up in one full conversion cycle - enabling rapid resumption of sampling with no initialization delay. This behavior is production-tested and guaranteed across –40°C to +125°C.