AD7992

The AD7992 is a 12-bit, high speed, low power, successive- approximation ADC. The part operates from a single 2.7 V to 5.5 V power supply and features a conversion time of 2 µs. The part contains a two channel multiplexer and track/hold amplifier which can handle input frequencies in excess of TBD kHz.

The AD7992 provides a two-wire serial interface which is compatible with I2C interfaces. The part comes in two versions, AD7992-0, and AD7992-1. Each version allows for a minimum of two different I2C addresses. The AD7992-0 supports Standard and Fast I²C interface Modes, while the AD7992-1 supports Standard, Fast, and two High-Speed I2C Interface Modes. The AD7992 normally remains in a power-down state while not converting, powering up only to perform conversions. The conversion process can be controlled using the CONVST pin, an Automatic Conversion Cycle selected through software control, or a mode where conversions occur across read Address operations.

The AD7992 uses advanced design techniques to achieve low power dissipation with a fast conversion time. There are no pipeline delays associated with the part. The reference for the part is applied externally and can be in the range of 1.2V to VDD. This allows the widest dynamic input range to the ADC. On-chip 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 programmed high or low limits are violated. This output can be used as an interrupt.