AD7928BRUZ

Overview

The AD7928BRUZ is a 12-bit, 8-channel successive approximation analog-to-digital converter (ADC) housed in a 20-lead TSSOP package. It operates from a single 2.7 V to 5.25 V supply with a maximum throughput rate of 1 MSPS. The device features an internal track-and-hold amplifier capable of handling input frequencies exceeding 8 MHz. Key electrical parameters include a minimum Signal-to-Noise Ratio (SNR) of 70 dB and a maximum power dissipation of 13.5 mW at 5 V. The serial interface supports SPI, QSPI, Microwire, and DSP protocols.

Feature Summary

• Eight single-ended analog inputs managed by a programmable channel sequencer for automated cyclic conversion.
• Flexible power management through auto shutdown and full shutdown modes to minimize current consumption during idle periods.
• VDRIVE function allows the digital serial interface to operate independently of the analog supply voltage.
• Zero pipeline delay architecture ensures immediate data availability following the conversion initiation.

Applications

• Industrial process control systems requiring multi-channel signal acquisition.
• Data acquisition modules for monitoring environmental or mechanical sensors.
• Automotive electronic control units (ECUs) utilizing qualified components.
• Portable instrumentation powered by battery sources requiring low energy consumption.

Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide to confirm temperature range and packaging type. Ensure the design accommodates the required external reference voltage specifications. Confirm that the host microprocessor timing aligns with the specified serial clock constraints. Validate automotive qualification requirements if operating in harsh environments.

Selection Notes

Select this component when high resolution is required alongside moderate sampling speeds across multiple channels. Consider the input voltage range configuration options relative to the available reference voltage. Evaluate the power budget against the operational throughput rate to ensure compliance with thermal limits. Verify compatibility with the target system's digital logic levels via the VDRIVE pin.

Part Context

This part belongs to the AD7908/AD7918/AD7928 family, differentiated primarily by resolution: 8-bit, 10-bit, and 12-bit respectively. All members share identical pinouts, interfaces, and functional architectures. The BRUZ suffix indicates the commercial temperature grade (-40°C to +85°C) and tube packaging format.

Replacement Considerations

The AD7918BRUZ and AD7908BRUZ are direct pin-compatible alternatives offering lower resolutions. For higher performance requirements, verify if newer Analog Devices ADC families maintain the same form factor and interface compatibility.