MAX1285 has an internal reference 400kSPS/300kSPS, single-supply, low power, serial l2-bit analog-

Single supply operation: +2.7 ~ +3.6 V; soil 1LSB (max) DNL, ??who 1LSB (max) lNL; internal track / hold; +2.5 V internal reference; low power consumption; 2.5mA (400kSPS); SPl / QSPI / MICROWIRE: 3-wire serial interface; pin-compatible, high-speed upgrade to MAX1240/MAX1241; 8-pin SO package