AD7923SRUZ-EP

Overview

The AD7923SRUZ-EP is a 12-bit, high-speed, low-power successive approximation register (SAR) analog-to-digital converter featuring four single-ended inputs with a channel sequencer. It operates from a single 2.7 V to 5.25 V supply and supports throughput rates up to 200 kSPS. The device includes a wide-bandwidth track-and-hold amplifier handling input frequencies exceeding 8 MHz. Key electrical specifications include a minimum signal-to-noise ratio of 70 dB at 50 kHz, integral nonlinearity of ±1 LSB, and differential nonlinearity of -0.9/+1.5 LSB. Power consumption reaches 7.5 mW max at 5 V and 3.6 mW max at 3 V during operation, dropping to 0.5 µA in full shutdown mode.

Feature Summary

• Military temperature range (-55°C to +125°C) supporting defense and aerospace applications under AQEC standards.
• Integrated channel sequencer allowing preprogrammed sequential conversion of four single-ended analog inputs.
• VDRIVE function enabling direct serial interface connection to 3 V or 5 V processor systems independent of AVDD.

Applications

• Aerospace and defense systems
• Milcom equipment
• Avionics instrumentation
• Unmanned systems

Procurement Notes

Verify the specific ordering suffix to confirm packaging type. The 'Z' suffix indicates RoHS compliance. Confirm that the required quantity matches the available tape and reel or tube options listed in the manufacturer's ordering guide. Ensure the military temperature grade and enhanced product features align with the project's reliability requirements before finalizing the purchase order.

Selection Notes

Select this component when a 12-bit resolution and 200 kSPS throughput are required for multi-channel acquisition in harsh environments. The integrated sequencer reduces microprocessor overhead by automating channel switching. Ensure the external reference voltage is stable at 2.5 V ±1% for specified performance. Verify that the system power budget accommodates the maximum current draw during active conversion cycles.

Part Context

This part belongs to the AD7923-EP enhanced product family, designed specifically for ruggedized applications. It shares the core SAR architecture with commercial variants but undergoes controlled manufacturing processes at single assembly and fabrication sites. This ensures consistent quality and traceability required for long-term deployment in critical infrastructure and defense platforms.

Replacement Considerations

The AD7923SRU-EP is the tube version of this component. Other AD7923 variants lack the EP designation and military temperature rating. Direct pin-compatible replacements must be verified against the enhanced product specifications to ensure adequate thermal and reliability margins.

FAQ

What is the maximum input frequency the track-and-hold amplifier can handle?

The device contains a low noise, wide bandwidth track-and-hold amplifier capable of handling input frequencies in excess of 8 MHz.

How does the VDRIVE pin affect the digital interface?

The VDRIVE pin allows the serial interface to connect directly to either 3 V or 5 V processor systems, operating independently of the analog supply voltage (AVDD).

What is the power consumption in full shutdown mode?

In full shutdown mode, the current consumption is 0.5 µA maximum, with typical values around 20 nA.