AD7908BRUZ

The AD7908BRUZ is an 8-bit, 8-channel successive approximation analog-to-digital converter (SAR ADC) with a maximum sampling rate of 1 MSPS. It is designed for low-power data acquisition and operates from a 2.7V to 5.25V supply. At 1 MSPS, maximum power dissipation is 6.0 mW with a 3V supply and 13.5 mW with a 5V supply.

The device integrates an input multiplexer and track-and-hold circuit feeding a single SAR converter with a 1:1 S/H:ADC ratio. It accepts eight single-ended inputs and provides a selectable input voltage range of 0 to REF_IN or 0 to 2×REF_IN via the control register. The external reference type enables flexible scaling of the conversion range, and the device achieves a minimum SINAD of 70 dB at a 50 kHz input frequency.

The serial data interface is compatible with SPI and DSP, with conversion controlled by CS and the serial clock. No pipeline delays are present, and the wide input bandwidth allows input frequencies above 8 MHz. A shutdown mode reduces maximum supply current to 0.5 µA.

The AD7908BRUZ is supplied in a 20-lead TSSOP surface-mount package and operates over -40°C to +85°C. These specifications make it appropriate for multichannel instrumentation, battery-powered systems, and industrial control applications.