AD7923BRUZ

Overview

The AD7923BRUZ is a 12-bit, high-speed, low-power successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It features four single-ended analog inputs with an integrated channel sequencer and operates from a single 2.7 V to 5.25 V supply. The device supports throughput rates up to 200 kSPS with a maximum power dissipation of 7.5 mW at 5 V. It utilizes a flexible serial interface compatible with SPI, QSPI, Microwire, and DSP standards. The component is housed in a 16-lead TSSOP package and is qualified for automotive applications.

Feature Summary

• Four single-ended analog input channels managed by a programmable channel sequencer.
• VDRIVE function enabling the serial interface to operate independently of the analog supply voltage.
• Flexible power management modes including auto shutdown and full shutdown to minimize current consumption.
• No pipeline delay architecture allowing accurate sampling control via the CS input.

Applications

• Local oscillators in wireless receiver and transmitter upconversion/downconversion sections
• Industrial process control systems requiring multi-channel data acquisition
• Battery-powered instrumentation utilizing low power SAR ADC architectures

Procurement Notes

Verify the specific suffix against official documentation to confirm packaging type and temperature grade. Confirm that the B version meets the required -40°C to +125°C operating range. Ensure the external reference voltage matches the specified 2.5 V ±1% requirement for optimal performance metrics.

Selection Notes

Select this component when a 12-bit resolution and 200 kSPS throughput are required for single-ended signals. Consider the VDRIVE feature if interfacing with processors operating at different logic levels than the analog supply. Evaluate the sequencer capabilities if sequential channel conversion without processor intervention is desired.

Part Context

The AD7923 belongs to the AD792x family of 12-bit SAR ADCs from Analog Devices. It shares architectural similarities with other members like the AD7927 but differs in channel count and pinout configuration. The BRUZ designation indicates the commercial/automotive temperature grade and the TSSOP-16 surface mount package format.

Replacement Considerations

Direct replacements within the same family include the AD7923ARMZ for alternative packaging. Cross-family comparisons should consider the AD7927 for increased channel counts or the AD7928 for higher speed requirements while maintaining similar interface protocols.

FAQ

What is the maximum analog input voltage range supported by the AD7923?

The analog input range can be configured as 0 V to REFIN or 0 V to 2 × REFIN depending on the RANGE bit setting in the control register.

How does the VDRIVE pin affect the digital interface?

The VDRIVE pin sets the logic level for the serial interface, allowing it to connect directly to either 3 V or 5 V processor systems independent of the AVDD supply voltage.

What is the typical power consumption in full shutdown mode?

In full shutdown mode, the maximum current consumption is 0.5 μA, resulting in a power dissipation of approximately 1.5 μW to 2.5 μW depending on the supply voltage.