The MAX1280/MAX1281 12-bit ADCs combine an 8-channel analog-input multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX1280 operates from a single +4.5V to +5.5V supply; the MAX1281 operates from a single +2.7V to +3.6V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and singleended/pseudo-differential operation. The 4-wire serial interface connects directly to SPITM/QSPITM/MICROWIRETM devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1280/ MAX1281 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. Both parts feature an internal +2.5V reference and a reference-buffer amplifier with a 1.5% voltageadjustment range. An external reference with a 1V to VDD1 range may also be used.