AD7801BRU

The AD7801BRU from Analog Devices is a single, 8-bit, voltage output digital-to-analog converter (DAC) designed for operation from a single +2.7 V to +5.5 V supply. Its integrated precision output buffer enables the DAC output to swing rail-to-rail, providing a wide dynamic range.

This DAC features a parallel microprocessor and DSP compatible interface with high-speed registers and double-buffered interface logic. Data is loaded into the input register on the rising edge of the Chip Select (CS) or Write (WR) signal. The AD7801BRU offers both internal and external reference capabilities, with the option to use an internal reference derived from VDD or an external reference applied at the REFIN pin. An asynchronous Clear (CLR) input allows the output of the DAC to be cleared.

With low power consumption, the AD7801BRU is suitable for portable, battery-powered instruments. It consumes a maximum of 1.75 mA at 3.3 V and reduces to 1 mA in power-down mode at 25°C. The device is available in a 20-lead TSSOP package, suitable for surface mounting.

Key electrical specifications include 8-bit resolution, relative accuracy of ±1 LSB maximum, and differential nonlinearity of ±1 LSB maximum. The on-chip output buffer amplifier allows for rail-to-rail output swing with a typical settling time of 1.2 µs. The operating temperature range is -40°C to 105°C.