AD7994BRUZ-0

Overview

The AD7994BRUZ-0 is a 12-bit, low-power successive approximation analog-to-digital converter (ADC) featuring four single-ended analog input channels and an I2C-compatible serial interface. It operates from a single 2.7 V to 5.5 V supply with a typical conversion time of 2 µs and a throughput rate up to 188 kSPS. The device includes a track-and-hold amplifier capable of handling input frequencies up to 11 MHz. Key specifications include a signal-to-noise ratio of 71 dB, integral nonlinearity of ±1 LSB, and differential nonlinearity of +1/–0.9 LSB. It supports standard and fast I2C modes, features pin-selectable addressing via the AS pin, and offers an out-of-range alert function. The component is housed in a 16-lead TSSOP package and operates within a temperature range of -40°C to +125°C.

Feature Summary

• I2C-compatible serial interface supporting standard and fast modes with pin-selectable addressing for multi-device bus configurations.
• Integrated sequencer operation allowing automatic cycle interval mode or command-based conversions controlled via software.
• On-chip limit registers enable programmable high and low thresholds with an open-drain ALERT output for out-of-range indication.
• Low power consumption with automatic shutdown between conversions, achieving maximum current draw of 1 µA in power-down mode.

Applications

• Battery-powered instrumentation requiring low power and multiple channel monitoring.
• Industrial process control systems utilizing I2C communication.
• Portable medical devices and data acquisition systems.
• Environmental monitoring sensors with single-ended inputs.

Procurement Notes

Verify the specific suffix '0' indicates support for standard and fast I2C modes only, distinguishing it from the '-1' variant which supports high-speed mode. Confirm the B version designation corresponds to the industrial temperature range of -40°C to +125°C. Ensure the external reference voltage applied to REFIN falls within the specified 1.2 V to VDD range for optimal performance.

Selection Notes

Select the AD7994BRUZ-0 when 12-bit resolution and four single-ended channels are required. Choose this part over the AD7993 if higher DC accuracy and dynamic performance are necessary. Consider the AD7998 if eight channels are needed, or the AD7992 for two channels. Ensure the system design accommodates the external reference requirement and I2C pull-up resistors.

Part Context

The AD7994 is part of the AD7993/AD7994 family of low-power, 10- and 12-bit ADCs. It shares architectural similarities with the AD7998 (8-channel) and AD7992 (2-channel) devices. The BRUZ-0 suffix denotes the 16-lead TSSOP package, industrial temperature grade, and I2C interface configuration limited to standard and fast modes.

Replacement Considerations

The AD7993BRUZ-0 serves as a lower-resolution alternative within the same package and interface family. For applications requiring more channels, the AD7998BRUZ-0 provides an 8-channel equivalent in a 20-lead TSSOP. The AD7994BRUZ-1 is compatible but supports high-speed I2C modes.