AD7997BRUZ-0REEL

Overview

The AD7997BRUZ-0REEL is an 8-channel, 10-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.7 V to 5.5 V supply and features a 2 µs typical conversion time with a throughput rate up to 188 kSPS. The device utilizes an I2C-compatible serial interface supporting standard and fast modes. Key electrical specifications include a signal-to-noise ratio of 61 dB minimum, integral nonlinearity of ±0.5 LSB maximum, and differential nonlinearity of ±0.5 LSB maximum. It requires an external reference voltage between 1.2 V and VDD. The component is housed in a 20-lead TSSOP package and functions within a temperature range of −40°C to +85°C.

Feature Summary

• Integrates an 8-channel multiplexer and track-and-hold amplifier for single-ended inputs.
• Supports pin-selectable I2C addressing to allow multiple devices on the same bus.
• Features automatic shutdown mode to minimize power consumption during idle periods.
• Includes programmable limit registers with an open-drain out-of-range alert output.

Applications

• Portable battery-powered instrumentation systems
• Industrial process control data acquisition
• Environmental monitoring sensor interfaces

Procurement Notes

Verify the specific suffix -0REEL indicates reel packaging configuration. Confirm the -0 variant supports only standard and fast I2C modes, distinct from the -1 variant which adds high-speed mode support. Ensure external reference components are selected to match the required input voltage range specifications.

Selection Notes

Select this component when eight single-ended channels are required with moderate resolution. Compare against the AD7998 if 12-bit accuracy is necessary. Consider the AD7992 or AD7994 if fewer channels reduce board space requirements. Verify I2C bus speed compatibility with the host controller.

Part Context

This part belongs to the AD7997/AD7998 family of low-power, multi-channel ADCs. It shares architectural similarities with the AD7992 and AD7994 but provides eight input channels instead of two or four. The BRUZ designation specifies the industrial temperature grade and TSSOP package type.

Replacement Considerations

Direct functional substitutes within the same family include the AD7998BRUZ-0REEL for higher resolution. For fewer channels, consider the AD7992BRUZ-0REEL or AD7994BRUZ-0REEL. Cross-family replacements require verification of pinout and interface compatibility.

FAQ

What is the maximum SCL frequency for the AD7997-0 variant?

The AD7997-0 variant supports standard mode (100 kHz) and fast mode (400 kHz) I2C interfaces. High-speed mode (3.4 MHz) is only available on the AD7997-1 variant.

How is the I2C address determined?

The I2C address is determined by the voltage applied to the AS pin. Connecting AS to AGND, VDD, or leaving it floating selects one of three possible addresses for the -0 variant.

Can the reference voltage exceed the supply voltage?

No, the REFIN input voltage range is specified from 1.2 V to VDD. The reference cannot exceed the analog supply voltage.