ADI AD7998BRUZ-1

The AD7997/AD7998 are 8-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 an 8-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz. The AD7997/AD7998 provide a 2-wire serial interface that is compatible with I²C interfaces. Each part comes in two versions, AD7997-0/AD7998-0 and AD7997-1/AD7998-1, and each version allows at least two different I²C addresses. The I²C interface on the AD7997-0/AD7998-0 supports standard and fast I²C interface modes. The I²C interface on the AD7997-1/ AD7998-1 supports standard, fast, and high speed I²C interface modes. The AD7997/AD7998 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 AD7997/AD7998 require an external reference that should be applied to the REF_IN 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.

• 10- and 12-bit ADC with fast conversion time: 2 μs typ
• 8 single-ended analog input channels
• Specified for VDD of 2.7 V to 5.5 V
• Low power consumption
• Fast throughput rate: up to 188 kSPS
• Sequencer operation
• Automatic cycle mode
• I²C-compatible serial interface supports standard, fast, and high speed modes
• Out-of-range indicator/alert function
• Pin-selectable addressing via AS
• Shutdown mode: 1 μA max
• Temperature range: -40°C to +85°C
• 20-lead TSSOP package