The AD7801 is a single, 8-bit, voltage output Digital-to-Analog Converter (DAC) that operates from a single +2.7 V to +5.5 V supply. It has a parallel microprocessor and DSP compatible interface with high-speed registers and double buffering. The AD7801 has internal and external reference voltage capability, DAC power-down function, parallel interface, and on-chip output buffer allowing rail-to-rail operation. It is suitable for portable battery-powered instruments, digital gain and offset adjustment, programmable voltage and current sources, programmable attenuators, and other applications.
The AD7801 is an 8‑bit voltage‑output digital‑to‑analog converter that operates from a single +2.7 V to +5.5 V supply. Its on‑chip precision output buffer allows the DAC output to swing rail‑to‑rail, making it suitable for portable battery‑powered equipment. The device features both internal VDD/2 reference and an external reference input (1 V to VDD/2), and a parallel microprocessor/DSP‑compatible interface with double‑buffered logic.
Key features include low power operation (typical 1.75 mA at 3.3 V, <1 µA in power‑down), fast settling (typical 1.2 µs), a slew rate of 7.5 V/µs, and selectable power‑down mode. The AD7801 is offered in 20‑lead SOIC and TSSOP packages and is intended for portable instruments, programmable voltage sources, and digital gain/offset adjustment applications.
| Resolution | 8 bits |
|---|---|
| Supply Voltage Range | +2.7 V to +5.5 V |
| Typical Supply Current (Normal Mode) | 1.75 mA max @ 3.3 V |
| Output Voltage Range | 0 V to VDD |
| Output Settling Time | Typical 1.2 µs (max 2 µs) |
| Slew Rate | 7.5 V/µs (typ) |
| Zero‑Code Error (at 25 °C) | 3 LSB (typ) |
The AD7801 operates from a single supply voltage of +2.7 V to +5.5 V.
The typical settling time to eight‑bit accuracy is about 1.2 µs (maximum 2 µs).