The document describes the features and characteristics of the AD7708/AD7718 8-/10-Channel, Low Voltage, Low Power, 24-Bit ADCs.
The AD7708 and AD7718 are complete analog front‑ends designed for low‑frequency measurement applications. The AD7708 provides a 16‑bit resolution while the AD7718 offers 24‑bit resolution, both available in 8‑ or 10‑channel configurations and packaged in 28‑lead SOIC or TSSOP.
Key features include programmable gain, simultaneous 50 Hz/60 Hz line‑frequency rejection, VREF‑Select for absolute and ratiometric measurements, and support for multiple serial interfaces (SPI, QSPI, MICROWIRE, DSP‑compatible). The devices operate from a single 3 V or 5 V supply with typical power consumption of about 1.28 mA at 3 V, making them suitable for industrial process control, instrumentation, pressure transducers, portable instruments, and smart transmitters.
| Resolution | AD7708 16‑bit, AD7718 24‑bit |
|---|---|
| Number of Channels | 8‑ or 10‑channel |
| Typical Power Consumption (Normal Mode) | 1.28 mA @ 3 V |
| Supported Serial Interfaces | SPI, QSPI, MICROWIRE, DSP‑compatible |
| Output Update Rate (AD7708, CHOP disabled) | 16.06 Hz min |
| Input Voltage Range | 20 mV to 2.56 V |
The AD7708 offers a 16‑bit resolution, while the AD7718 provides a 24‑bit resolution.
The devices support 3‑wire SPI, QSPI, MICROWIRE, and a DSP‑compatible interface.
Typical power consumption is about 1.28 mA when operating at 3 V.