MAX148, MAX149

+2.7V to +5.25V Low-Power 8-Channel Serial 10-Bit ADCs

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Status Explanations for product status codes

Part Number Status
MAX148 Active: In Production. See Ordering Information for details.
MAX149 Active: In Production. See Ordering Information for details.


The MAX148/MAX149 10-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and sample to 133ksps. 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 MAX148/MAX149 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX149 has an internal 2.5V reference, while the MAX148 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.

These devices provide a hard-wired active-low SHDN 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 MAX148/MAX149, 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 MAX148/MAX149 are available in 20-pin PDIP and 20-pin SSOP packages.

For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.

Data Sheet

Download this datasheet in PDF formatDownload Rev 5 (PDF, 1.9MB)
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Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs
  • Single-Supply Operation: +2.7V to +5.25V
  • Internal 2.5V Reference (MAX149)
  • 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 PDIP/SSOP Packages


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

Key Specifications:

Precision ADCs (< 5Msps)
Part Number Resolution
Input Chan. Conv. Rate
ADC Architecture Data Bus Diff/S.E. Input Internal VREF
External VREF
External VREF
Unipolar VIN
Bipolar VIN
ADC max nominal min max max max See Notes
MAX148  10 8 133 SAR SPI Both 2.5 1 5.25 2.5 1.25 66 $4.17 @1k
MAX149  $4.83 @1k
See All Precision ADCs (< 5Msps) (456)

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.


MAX148, MAX149: Typical Operating Circuit
Typical Operating Circuit

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Document Ref.: 19-0464 Rev 5; 2012-08-14
This page last modified: 2012-09-06