AD5321

The AD5301/AD5311/AD5321 are single 8-, 10- and 12-bitbuffered voltage-output DACs that operate from a single +2.5 Vto +5.5 V supply consuming 120 mA at 3 V. The on-chip outputamplifier allows rail-to-rail output swing with a slew rate of0.7 V/ms. It uses a 2-wire (I2C compatible) serial interface thatoperates at clock rates up to 400 kHz. Multiple devices canshare the same bus.

The reference for the DAC is derived from the power supplyinputs and thus gives the widest dynamic output range. Theseparts incorporate a power-on-reset circuit, which ensures thatthe DAC output powers-up to zero volts and remains there untila validwrite takes place. The parts contain a power-down featurewhich reduces the current consumption of the device to 50 nAat 3 V and provides software-selectable output loads while inpower-down mode.

The low power consumption in normal operation make theseDACs ideally suited to portable battery-operated equipment.The power consumption is 0.75 mW at 5 V, 0.36 mW at 3 Vreducing to 1 mW in all power-down modes.