MAX148

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


Please check latest availability status for a specific part variant.

Description

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.
MAX148, MAX149: Typical Operating Circuit MAX148, MAX149: Typical Operating Circuit Enlarge+

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

Applications/Uses

  • Battery-Powered Instruments
  • Data Acquisition
  • Medical Instruments
  • Pen Digitizers
  • Portable Data Logging
  • Process Control
Part NumberResolution
(bits)
Input Chan.Conv. Rate
(ksps)
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
(V)
External VREF
(V)
External VREF
(V)
Unipolar VIN
(V)
Bipolar VIN
(±V)
THD
(dB)
INL
(±LSB)
Package/PinsBudgetary
Price
ADCmaxnominalminmaxmaxmaxSee Notes
MAX148 108133SARSPIBoth2.515.252.51.25-701
PDIP/20
SSOP/20
$4.17 @1k
MAX149 
PDIP/20
SSOP/20
$4.83 @1k
See All Precision ADCs (< 5Msps) (444)
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.

Quality and Environmental Data

Product Reliability Reports: MAX148.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX148ACAP+
  • MAX148ACAP+T
  • MAX148ACPP+
  • MAX148AEAP+
  • MAX148BCAP+
  • MAX148BCAP+T
  • MAX148BCPP+
  • MAX148BEAP+
  • MAX148BEAP+T
  • MAX148BEPP+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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