AD7918BRU

Overview

The AD7918BRU is an 8-channel, 10-bit 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 eight single-ended analog inputs managed by a programmable channel sequencer and includes a wide bandwidth track-and-hold amplifier capable of handling input frequencies exceeding 8 MHz. Power dissipation reaches a maximum of 13.5 mW at 5 V and 6.0 mW at 3 V during full-speed operation. The serial interface supports SPI, QSPI, MICROWIRE, and DSP protocols.

Feature Summary

• Integrated channel sequencer for automated multi-channel conversion
• VDRIVE function enabling direct connection to 3 V or 5 V processors
• Flexible power management with auto shutdown and full shutdown modes
• No pipeline delays for immediate data availability

Applications

• Industrial process control systems
• Data acquisition modules
• Battery-powered instrumentation
• Automotive sensor interfaces

Procurement Notes

Verify the specific suffix against the manufacturer's current ordering guide to confirm temperature range and packaging format. Ensure the component matches the required automotive qualification if operating in that environment. Cross-reference pinouts and electrical specifications with the latest datasheet revision to avoid integration errors.

Selection Notes

Select this component when multiple single-ended signals require digitization at moderate resolution. The integrated sequencer reduces microprocessor overhead compared to discrete multiplexing solutions. Verify that the external reference voltage meets the specified 2.5 V requirement for optimal performance metrics.

Part Context

This part belongs to the AD7908/AD7918/AD7928 family, which shares identical pinouts and functional architectures while differing in resolution. The AD7918 specifically provides 10-bit accuracy, positioning it between the 8-bit AD7908 and the 12-bit AD7928 for balanced performance and power consumption.

Replacement Considerations

The AD7918BRUZ serves as the lead-free equivalent within the same package. For higher resolution requirements, consider the AD7928 series. For lower resolution needs, the AD7908 offers a compatible alternative.