AD7904BRUZ

Overview

The AD7904BRUZ is an 8-bit, 4-channel successive approximation analog-to-digital converter (ADC) from Analog Devices. It operates on a single supply voltage ranging from 2.7 V to 5.25 V and supports throughput rates up to 1 MSPS. The device features four single-ended analog inputs with a built-in channel sequencer for automated multi-channel conversion. It utilizes a flexible serial interface compatible with SPI, QSPI, Microwire, and DSP standards. Power consumption is optimized at 6 mW maximum at 1 MSPS with 3 V supplies. The component is housed in a 16-lead TSSOP package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated channel sequencer enables automatic sequential conversion of multiple analog input channels without external control overhead.
• VDRIVE function allows the digital serial interface to operate independently of the analog supply voltage, facilitating direct connection to 3 V or 5 V processors.
• Flexible power management includes auto-shutdown and full-shutdown modes to minimize current consumption during idle periods.

Applications

• Battery-powered data acquisition systems requiring low power consumption
• Industrial process control monitoring
• Portable instrumentation

Procurement Notes

Verify that the specific part number matches the required resolution and package type. Confirm that the operating environment falls within the specified commercial temperature range. Ensure the design accommodates the external reference voltage requirement and single-ended input configuration.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application's accuracy requirements. Consider the AD7914 or AD7924 if higher resolution (10-bit or 12-bit) is needed. Verify that the system can provide the necessary external reference voltage, as the device does not include an internal reference.

Part Context

The AD7904BRUZ belongs to the AD7904/AD7914/AD7924 family of high-speed, low-power ADCs. These devices share identical pinouts and functional architectures, differing primarily in resolution. The 'B' suffix indicates the commercial temperature grade (-40°C to +85°C), while the 'U' suffix denotes the TSSOP-16 package.

Replacement Considerations

The AD7914BRUZ and AD7924BRUZ are pin-compatible alternatives offering 10-bit and 12-bit resolutions, respectively. Other members of the AD79xx series may require schematic modifications due to different pin configurations or electrical characteristics.