AD7993BRUZ-1

The AD7993/AD7994 are 4-channel, 10- and 12-bit, low power, successive approximation ADCs with an I²C -compatible interface. The parts operate from a single 2.7 V to 5.5 V power supply and feature a 2 μs conversion time. The parts contain a 4-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz. The AD7993/AD7994 provide a 2-wire serial interface that is compatible with I²C interfaces. Each part comes in two versions, AD7993-0/AD7994-0 and AD7993-1/AD7994-1, and each version allows for at least two different I²C addresses. The I²C interface on the AD7993-0/AD7994-0 supports standard and fast I²C interface modes. The I²C interface on the AD7993-1/ AD7994-1 supports standard, fast, and high speed I²C interface modes. The AD7993/AD7994 normally remain in a shutdown state while not converting, and power 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 AD7993/AD7994 require an external reference that should be applied to the REFIN pin and can be 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 programmed high or low limits are violated by the conversion result. This output can be used as an interrupt.

Key features

• 10- and 12-bit ADC with fast conversion time: 2 μs typ
• 4 single-ended analog input channels
• Specified for VDD of 2.7 V to 5.5 V
• Low power consumption
• Fast throughput rate: 188 kSPS
• Temperature range: - 40°C to +125°C
• Sequencer operation
• Automatic cycle interval mode
• I²C -compatible serial interface
• I²C interface supports standard, fast, and high speed modes
• Out-of-range indicator/alert function
• Pin-selectable addressing via AS
• Shutdown mode: 1 μA max
• 16-lead TSSOP package