Analog Devices Inc./Maxim Integrated MAX1395ETB+T

Overview

The MAX1395ETB+T from Maxim Integrated is a 10-bit, single-supply, micropower successive-approximation register (SAR) analog-to-digital converter (ADC) with dual single-ended analog inputs (AIN1/AIN2), 357ksps maximum throughput, ±0.5 LSB INL/DNL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for ultra-low-power portable data acquisition in battery-powered medical and industrial instruments.

For engineers reviewing the MAX1395ETB+T datasheet, MAX1395ETB+T pinout, MAX1395ETB+T application, or MAX1395ETB+T equivalent, key selection considerations include its 1.5V–3.6V supply range, external reference support (0.6V to VDD), channel-select logic (CH1/CH2), 3mm × 3mm 10-pin TDFN-EP package, and guaranteed performance over –40°C to +85°C.

Technical Context

The MAX1395ETB+T employs a track-and-hold circuit followed by a 10-bit SAR core, with input sampling initiated on the CS falling edge and conversion completed in 11 clock cycles (2.2µs). Its dual single-ended architecture uses CH1/CH2 to select between AIN1 and AIN2, each supporting 0–VREF input range and exhibiting ±0.1 LSB channel-to-channel offset/gain matching.

It features AutoShutdown™ between conversions, reducing IDD to 3.1µW at 1ksps (1.8V) and <1µA in shutdown mode. The 5MHz serial interface outputs MSB-first 10-bit straight-binary data preceded by four leading zeros, compatible with SPI (CPOL/CPHA = 0/0 or 1/1), QSPI, MICROWIRE, and DSP interfaces without protocol translation.

Key Specifications

Pinout & Package

The MAX1395ETB+T is housed in a 3mm × 3mm, 10-pin TDFN-EP package with exposed pad (not internally connected; recommended to tie to GND). Pin functions are validated per Maxim's official datasheet Rev 3 (10/09).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADS7822U and AD7476ARTZ-REEL7, the MAX1395ETB+T uniquely balances dual-channel sampling, 1.5V operation, and micropower consumption - making it the only option among the three qualified for sub-2V, battery-critical, multi-sensor portable designs.

Availability

The MAX1395ETB+T is available at Aetrix Electronics and suitable for portable datalogging, medical instrumentation, battery-powered test equipment, and industrial process monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MAX1395ETB+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX1392/MAX1395 product line was designed specifically for ultra-low-power, small-footprint data acquisition in portable and energy-constrained systems - emphasizing micropower operation, wide supply range, and ease of integration with microcontrollers.

FAQ

What is the maximum sample rate supported by the MAX1395ETB+T?

The MAX1395ETB+T supports a maximum throughput rate of 357ksps, achieved with a 5MHz SCLK and 14-clock-cycle conversion sequence (including power-up, acquisition, and conversion). At this rate, the device consumes 0.945mW at 1.8V, and maintains 61dB SINAD at 85kHz input frequency - confirming real-time performance for medium-bandwidth sensor signals.

How does the MAX1395ETB+T handle channel selection between AIN1 and AIN2?

The MAX1395ETB+T uses the CH1/CH2 pin (Pin 6) for channel selection: logic low selects AIN1, logic high selects AIN2. This signal must be stable for at least 10ns (tCHS) before the first SCLK rising edge after CS fall. Channel switching occurs synchronously with each conversion start, enabling deterministic time-multiplexed sampling without firmware overhead.

Does the MAX1395ETB+T require an external reference, and what voltage range is supported?

Yes, the MAX1395ETB+T requires an external reference applied to the REF pin (Pin 5), supporting 0.6V to VDD + 0.05V. This wide range allows use of low-voltage references (e.g., 0.6V bandgap) or direct connection to VDD for ratiometric measurements. A 0.1µF bypass capacitor is mandatory at the REF pin to ensure stable conversion accuracy and low noise.

What package type and thermal characteristics does the MAX1395ETB+T use?

The MAX1395ETB+T is supplied in a 3mm × 3mm, 10-pin TDFN-EP package with exposed pad. The exposed pad is not internally connected and should be soldered to GND for optimal thermal dissipation and noise immunity. Power dissipation is rated at 1481.5mW at TA = +70°C, derating 18.5mW/°C above that temperature.

Can the MAX1395ETB+T operate from a single lithium coin cell?

Yes, the MAX1395ETB+T is explicitly designed for single LiMnO₂ coin cell operation (e.g., CR2032, nominal 3V, end-of-life ~2.0V), as well as two alkaline/NiMH cells (nominal 3V, end-of-life ~1.6V). Its 1.5V–3.6V supply range and micropower modes (3.1µW at 1ksps) eliminate the need for voltage regulation - simplifying power architecture and improving system efficiency.