AD7908BRUZ

Overview

The AD7908BRUZ is an 8-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 a wide bandwidth track-and-hold amplifier capable of handling input frequencies exceeding 8 MHz and includes a channel sequencer for preprogrammed sequential conversions. Power dissipation is specified at 6 mW max at 3 V and 13.5 mW max at 5 V. The serial interface supports SPI, QSPI, MICROWIRE, and DSP protocols.

Feature Summary

• Integrated channel sequencer allows preprogrammed selection of multiple single-ended inputs for sequential conversion without external logic.
• Flexible power management includes auto shutdown and full shutdown modes to minimize current consumption during idle periods.
• VDRIVE function enables the serial interface to operate independently of the analog supply voltage, facilitating direct connection to 3 V or 5 V processors.

Applications

• Industrial process control systems requiring multi-channel data acquisition
• Battery-powered instrumentation utilizing low power consumption modes
• Automotive sensor interfaces compatible with standard microprocessor buses

Procurement Notes

Verify the specific suffix BRUZ corresponds to the tube packaging variant rather than reel configurations when sourcing. Confirm that the B version meets the required -40°C to +85°C operating temperature range for your application environment. Ensure the external reference voltage is maintained within the specified 2.5 V ±1% tolerance for optimal performance.

Selection Notes

Select this component when eight single-ended channels are required alongside high-speed sampling capabilities. Consider the AD7918 or AD7928 if higher resolution (10-bit or 12-bit) is necessary, noting that DC accuracy specifications such as offset error increase with resolution. Verify that the system can accommodate the external reference requirement, as no internal reference is included.

Part Context

This part belongs to the AD7908/AD7918/AD7928 family of high-speed, low-power SAR ADCs. All members share identical pinouts, power characteristics, and interface protocols, differing primarily in resolution and resulting linearity specifications. The BRUZ designation indicates the commercial temperature grade and surface mount TSSOP package format.

Replacement Considerations

The AD7908BRU-REEL7 serves as a functional equivalent in tape-and-reel packaging. Cross-model replacements include the AD7918BRUZ for 10-bit resolution or the AD7928BRUZ for 12-bit resolution, provided the increased offset errors associated with higher resolutions are acceptable.