资 源 简 介
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 trackand-hold amplifier that can handle input frequencies up to 11 MHz. The AD7992 provides a 2-wire serial interface compatible with I 2 C interfaces. The part comes in two versions， the AD7992-0 and the AD7992-1， and each version allows for at least two different I2 C addresses. The AD7992-0 supports standard and fast I2 C interface modes， and the AD7992-1 supports standard， fast， and high speed I2 C 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 I2 C 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 VDD. 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-ofrange indicator output （ALERT） becomes active when the conversion result violates the programmed high or low limits. This output can be used as an interrupt.
