AD7998BRU-0REEL

Overview

The AD7998BRU-0REEL is an 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a single-ended input architecture and operates from a 2.7 V to 5.5 V supply. The device supports I2C-compatible serial interfaces with standard and fast modes. Key electrical parameters include a maximum throughput rate of 188 kSPS, a typical conversion time of 2 µs, and a signal-to-noise ratio (SNR) of 71 dB. It 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 signals.
• Supports I2C-compatible serial interface with pin-selectable addressing via the AS pin.
• Includes on-chip limit registers and an open-drain ALERT output for out-of-range detection.
• Features automatic shutdown mode to minimize power consumption when not converting.

Applications

• Battery-powered data acquisition systems requiring low power consumption.
• Industrial process control monitoring with multiple sensor inputs.
• Portable instrumentation utilizing I2C bus connectivity.

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 'REEL' designation corresponds to tape and reel packaging rather than tube packaging. Ensure the 'B' grade meets the required -40°C to +85°C operating temperature specifications for your application environment.

Selection Notes

Select this component when eight single-ended channels are required with 12-bit resolution. It is suitable for applications where I2C bus simplicity is prioritized over higher speed or differential inputs. Compare against the AD7997 if 10-bit resolution is sufficient, or the AD7994/AD7992 for fewer channel counts. Ensure the external reference voltage range of 1.2 V to VDD aligns with system requirements.

Part Context

This part belongs to the AD7997/AD7998 family of low-power, 8-channel ADCs. It shares the same physical footprint and pinout as the 10-bit AD7997 variant. The family is designed for applications needing multiple analog inputs with minimal microcontroller overhead due to the integrated I2C interface and sequencer capabilities.

Replacement Considerations

Direct functional substitutes within the same package include the AD7997BRU-0REEL for reduced resolution needs. For higher speed requirements, consider the AD7998BRUZ-1REEL which supports high-speed I2C modes. Verify that any replacement maintains the 20-lead TSSOP form factor and compatible I2C addressing logic.