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MAX146

MAX146

+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs

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Overview

Description

The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 operates from a single +2.7V to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/ QSPI™ and MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.

These devices provide a hard-wired SHDN-bar pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.

The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.

For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.
MAX146, MAX147: Typical Operating Circuit MAX146, MAX147: Typical Operating Circuit Enlarge+

Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs
  • Single-Supply Operation
    • +2.7V to +3.6V (MAX146)
    • +2.7V to +5.25V (MAX147)
  • Internal 2.5V Reference (MAX146)
  • Low Power
    • 1.2mA (133ksps, 3V supply)
    • 54µA (1ksps, 3V supply)
    • 1µA (power-down mode)
  • SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin DIP/SSOP Packages

Applications/Uses

  • Battery-Powered Applications
  • Data Acquisition
  • Medical Instruments
  • Pen Digitizers
  • Portable Data Logging
  • Process Control

Parametric Specs


Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX146EVKIT: Evaluation Kit for the MAX146 and MAX147
MAX147EVKIT: Evaluation Kit for the MAX146 and MAX147

Technical Documents

App Note 1108 Understanding Single-Ended, Pseudo-Differential and Fully-Differential ADC Inputs

Quality And Environmental

Product Reliability Reports: MAX146.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Related Resources

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Technical Docs

Reference Designs

Type ID Title
Evaluation Board1107MAX147EVKIT Evaluation Kit for the MAX146 and MAX147
Evaluation Board1107MAX146EVKIT Evaluation Kit for the MAX146 and MAX147