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 a 20-pin DIP and a 20-pin SSOP.
For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.
Key Features
Applications/Uses
8-Channel Single-Ended or 4-Channel Differential Inputs
Single +2.7V to +5.25V Supply Operation
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
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 prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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