Features and Benefits
- 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
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.
- Battery-Powered Instruments
- Data Acquisition
- Medical Instruments
- Pen Digitizers
- Portable Data Logging
- Process Control
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX148 Reliability Data1/12/2023
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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