AD9831 is a numerically controlled oscillator employing a phase accumulator, a sine look-up table and a 10-bit D/A converter integrated on a single CMOS chip.
The AD9831 is a numerically controlled oscillator that integrates a phase accumulator, a sine look‑up table, and a 10‑bit DAC on a single CMOS chip. It supports clock rates up to 25 MHz, offers phase and frequency modulation, and includes a power‑down pin for low‑power operation.
The document lists detailed electrical specifications, timing characteristics, absolute maximum ratings, pin configurations, and functional block diagrams. It also includes performance graphs for SFDR, SNR, and current consumption across various clock frequencies, as well as mechanical dimensions and ordering information.
| Resolution | 10 Bits |
|---|---|
| Maximum Update Rate (fMAX) | 25 MSPS |
| Full‑Scale Output Current | 4 mA nominal, 5 mA max |
| Power Consumption (5 V) | 125 mW |
| Power Consumption (3 V) | 40 mW |
| Narrow‑Band SFDR | -72 dBc min |
| Wide‑Band SFDR | -50 dBc min |
| Signal‑to‑Noise Ratio | 50 dB min |
| Internal Reference Voltage | 1.21 V typ |
| REFIN Input Impedance | 10 MΩ typ |
| REFOUT Output Impedance | 300 Ω typ |
| Logic Input High Voltage (VINH) | VDD – 0.9 V min |
| Logic Input Low Voltage (VINL) | 0.9 V max |
| Power‑down Option | Yes |
The AD9831 supports clock rates up to 25 MHz.
Yes, the device includes a power‑down pin that allows external control of a low‑power mode.
The full‑scale output current is 4 mA nominal, up to 5 mA maximum.
The internal reference voltage is 1.21 V typical at +25 °C.