AD7908BRU-REEL7

Overview

The AD7908BRU-REEL7 is an 8-bit, 8-channel successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.7 V to 5.25 V power supply and supports throughput rates up to 1 MSPS. The device features eight single-ended analog inputs with a programmable channel sequencer and a wide bandwidth track-and-hold amplifier capable of handling input frequencies exceeding 8 MHz. It utilizes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. Power consumption is specified at 6.0 mW maximum at 1 MSPS with a 3 V supply and 13.5 mW maximum with a 5 V supply. The component is housed in a 20-lead TSSOP package.

Feature Summary

• Eight single-ended analog input channels managed by a programmable channel sequencer for automated sequential conversion.
• Integrated low-noise, wide-bandwidth track-and-hold amplifier supporting input frequencies above 8 MHz.
• Flexible serial interface compatible with standard microprocessor protocols including SPI, QSPI, MICROWIRE, and DSP modes.
• VDRIVE function enabling direct connection to 3 V or 5 V processor systems independent of the analog supply voltage.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Battery-powered instrumentation utilizing low-power SAR ADC architectures.
• Automotive sensor interfaces meeting automotive qualification standards.
• Data acquisition modules interfacing with microprocessors or DSPs.

Procurement Notes

Verify that the specific ordering suffix corresponds to the reel packaging format required for your assembly line. Confirm that the B version temperature range meets your operational environment specifications. Ensure the external reference voltage is stable within the specified tolerance to maintain accuracy. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application's dynamic range requirements. Consider the AD7918 or AD7928 variants if higher resolution (10-bit or 12-bit) is necessary. Evaluate the power consumption constraints against the available supply voltage, as dissipation varies between 3 V and 5 V operation. Ensure the system can accommodate the external reference voltage requirement for optimal performance.

Part Context

This part belongs to the AD7908/AD7918/AD7928 family of high-speed, low-power SAR ADCs. All members share identical pinouts, serial interfaces, and functional blocks, differing primarily in resolution and resulting dynamic performance metrics. The BRU suffix indicates the commercial temperature grade variant packaged in a 20-lead TSSOP. The REEL7 designation specifies the tape and reel packaging configuration for automated surface-mount assembly.

Replacement Considerations

The AD7908BRUZ is the tube-packaged equivalent of this reel-delivered component. For applications requiring higher resolution, the AD7918BRU-REEL7 (10-bit) and AD7928BRU-REEL7 (12-bit) are pin-compatible alternatives within the same family.