The AD7708/AD7718 is an 8/10-channel, low-voltage, low-power, single-ended differential input ADC from Analog Devices. This ADC has 16/24-bit resolution, supports single conversion cycle setting, programmable gain front end, simultaneous suppression of 50 Hz and 60 Hz interference, and can be used for absolute and ratiometric measurement through VREF Select. It also supports 3-wire serial SPI, QSPI, MICROWIRE, and DSP-compatible Schmitt trigger SCLK interface. The operating voltage is single 3 V and 5 V, the normal operating current is 1.28 mA, and the power-down current is 30 µA (32 mA).
The AD7708 (16‑bit) and AD7718 (24‑bit) are complete analog front‑ends for low‑frequency measurement applications. They support 8 or 10 channels, programmable gain, and VREF‑Select™ for absolute or ratiometric measurements. The devices operate from a single 3 V or 5 V supply and feature low power consumption, with normal mode current of about 1.28 mA at 3 V and a power‑down current of only 30 pA.
Typical applications include industrial process control, instrumentation, pressure transducers, portable instrumentation and smart transmitters. The parts are offered in 28‑lead SOIC and TSSOP packages and include on‑chip functions such as a PLL‑generated 32.768 kHz clock, Schmitt‑triggered SPI/QSPI interfaces, and built‑in calibration capabilities.
| Resolution (AD7708) | 16‑bit |
|---|---|
| Resolution (AD7718) | 24‑bit |
| Normal mode current consumption | 1.28 mA @ 3 V |
| Power‑down current | 30 pA (32 kHz crystal running) |
| Supply voltage | Single 3 V or 5 V operation |
| Input voltage range | 20 mV to 2.56 V |
| Output update rate (CHOP disabled) | 16.06 Hz min |
| Operating temperature range | -40 °C to +85 °C |
The AD7708 provides a 16‑bit resolution.
Both devices operate from a single 3 V or 5 V supply.
The power‑down current is 30 pA when the 32 kHz crystal is running.
The devices are rated for -40 °C to +85 °C.