The AD7991/AD7995/AD7999 are 4-channel, 12-/10-/8-bit ADCs with an I2C-compatible interface. They feature fast conversion time and low power consumption, making them suitable for applications such as system monitoring, battery-powered systems, data acquisition, and medical instruments.
The AD7991/AD7995/AD7999 family are successive‑approximation ADCs that operate from a single 2.7 V to 5.5 V supply. They provide 12‑, 10‑, or 8‑bit resolution with a typical 1 µs conversion time and support fast, standard, and high‑speed I²C‑compatible modes. Each device includes four single‑ended analog input channels (or three channels plus a reference input) and features automatic shutdown to minimize power consumption.
These converters are intended for system monitoring, battery‑powered systems, data acquisition, and medical instruments. They are supplied in an 8‑lead SOT‑23 package and are available in multiple ordering variants with different I²C addresses. The datasheet includes detailed specifications, pin configurations, timing diagrams, and an ordering guide.
| Resolution | 12 Bits (AD7991), 10 Bits (AD7995), 8 Bits (AD7999) |
|---|---|
| Temperature Range | -40°C to +125°C |
| Conversion Time | 1 µs typical |
| Full‑Power Bandwidth | 14 MHz @3 dB |
| Input Voltage Range | 0 V to VDD |
| Power‑Down Current (Interface Inactive) | 1 pA (typical) |
The devices operate from –40 °C to +125 °C.
Each conversion takes about 1 µs.
Four single‑ended analog input channels (or three channels plus a reference input).