+2.7V, Low-Power, 4-Channel, Serial 12-Bit ADCs in QSOP-16

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The MAX1246/MAX1247 12-bit data-acquisition systems combine a 4-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX1246 operates from a single +2.7V to +3.6V supply; the MAX1247 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 MAX1246/MAX1247 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX1246 has an internal 2.5V reference, while the MAX1247 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 MAX1246/MAX1247, 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 MAX1246/MAX1247 are available in a 16-pin DIP and a small QSOP that occupies the same board area as an 8-pin SO.

For 8-channel versions of these devices, see the MAX146/MAX147 data sheet.
MAX1246, MAX1247: Typical Operating Circuit MAX1246, MAX1247: Typical Operating Circuit Enlarge+

Key Features

  • 4-Channel Single-Ended or 2-Channel Differential Inputs
  • Single-Supply Operation:
    • +2.7V to +3.6V (MAX1246)
    • +2.7V to +5.25V (MAX1247)
  • Internal 2.5V Reference (MAX1246)
  • 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
  • 16-Pin QSOP Package (same area as 8-pin SO)


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

See parametric specs for Precision ADCs (< 5Msps) (432)

Part NumberResolution
# Input ChannelsConv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Unipolar VIN
Bipolar VIN
(ADC)(max)(nominal)(min)(max)(max)(max)(See Notes)
MAX1246 124133SARSPIBoth2.513.62.51.2570-881
$9.34 @1k
MAX1247 -5.25
$7.56 @1k

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.

MAX1246EVKIT: Evaluation Kit for the MAX1246 and MAX1247
MAX1247EVKIT: Evaluation Kit for the MAX1246 and MAX1247

Technical Documents

Tutorial 801 Frequently Asked Questions about Data Converters
Request Reliability Report for: MAX1247 
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.

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