MAX148 Datasheet
+2.7V to +5.25V Low-Power 8-Channel Serial 10-Bit ADCs
+2.7V to +5.25V Low-Power 8-Channel Serial 10-Bit ADCs
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The MAX148 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 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.
The MAX148 requires an external reference. The MAX148 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, 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 are available in 20-pin PDIP and 20-pin SSOP packages.
For 4-channel versions of these devices, see the MAX1248 data sheet.