The 4-wire serial interface connects directly to SPITM/QSPITM and MICROWIRETM devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1080/ MAX1081 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The devices feature an internal +2.5V reference and a reference-buffer amplifier with a 1.5% voltage-adjustment range. An external reference with a 1V to VDD1 range may also be used.