Analog Devices AD7992 Product Info

The AD7992 is a 12-bit, low power, successive approximation ADC with an I2 C-compatible interface. The part operates from a single 2.7 V to 5.5 V power supply and features a 2 µs conversion time. The part contains a 2-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz.

The AD7992 provides a 2-wire serial interface compatible with I²C interfaces. The part comes in two versions, the AD7992-0 and the AD7992-1, and each version allows for at least two different I²C addresses. The AD7992-0 supports standard and fast I²C interface modes, and the AD7992-1 supports standard, fast, and high speed I²C interface modes.

The AD7992 normally remains in a shutdown state while not converting, and powers up only for conversions. The conversion process can be controlled using the CONVST pin, by a command mode where conversions occur across I²C write operations, or an automatic conversion interval mode selected through software control.

The AD7992 requires an external reference in the range of 1.2 V to V_DD. This allows the widest dynamic input range to the ADC. On-chip limit registers can be programmed with high and low limits for the conversion result, and an open-drain, out-of-range indicator output (ALERT) becomes active when the conversion result violates the programmed high or low limits. This output can be used as an interrupt.

PRODUCT HIGHLIGHTS

1. 2 µs conversion time and low power consumption.
2. I²C-compatible serial interface with pin-selectable addresses. Two AD7992 versions allow five AD7992 devices to be connected to the same serial bus.
3. The part features automatic shutdown while not converting to maximize power efficiency. Current consumption is 1 µA max when