The AD7821 is a high-speed, 8-bit, sampling analog-to-digital converter that offers improved performance over the popular AD7820. It features a conversion time of 660 ns and a 100 kHz signal bandwidth. The device utilizes a half-flash conversion technique, which eliminates the need for an external clock signal, and includes a built-in track-and-hold function capable of digitizing full-scale signals up to 100 kHz.
| Resolution | 8 Bits |
|---|---|
| Total Unadjusted Error | ±1 LSB max |
| Conversion Time (WR-RD Mode) | 660 ns |
| Signal Bandwidth | 100 kHz |
| Sample Rate | 1 MHz |
| Power Dissipation | 50 mW typ |
| Input Leakage Current | ±3 µA max |
| Operating Temperature (K/B Version) | –40 °C to +85 °C |
| Operating Temperature (T Version) | –55 °C to +125 °C |
The conversion time for the WR-RD mode is 660 ns, with 700 ns for the RD mode.
No, it uses a half-flash conversion technique that eliminates the need to generate a CLK signal.
The device offers a 100 kHz signal bandwidth.
The AD7821 features an excellent total unadjusted error figure of less than ±1 LSB over the full operating temperature range.