AD7923SRU-EP

Overview

The AD7923SRU-EP is a 12-bit, high-speed, low-power successive approximation register (SAR) analog-to-digital converter featuring four single-ended inputs with an integrated 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 capable of 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 a maximum of 7.5 mW at 5 V and 3.6 mW at 3 V during full operation.

Feature Summary

• Supports defense and aerospace applications under the AQEC standard with military temperature range capabilities.
• Features controlled manufacturing baseline with unique assembly, test, and fabrication sites.
• Includes flexible power management with serial clock speed control and deep shutdown modes.

Applications

• Aerospace and defense systems
• Military communications (Milcom)
• Avionics instrumentation
• Unmanned aerial systems

Procurement Notes

Verify the specific ordering suffix to confirm packaging format, as the base model designation applies to both tube and reel configurations. Confirm RoHS compliance status via the 'Z' suffix if required. Ensure the enhanced product qualification data is requested separately for aerospace or defense procurement requirements. Check current availability as these components may have limited distribution channels.

Selection Notes

Select this component when operating in extreme environments requiring a temperature range of −55°C to +125°C. Choose based on the need for a single-chip solution combining four channels with hardware sequencing logic. Consider the VDRIVE pin flexibility for interfacing with either 3 V or 5 V digital processors independently of the analog supply voltage.

Part Context

This part belongs to the AD7923 family of 4-channel SAR ADCs. The EP suffix designates it as an Enhanced Product manufactured under strict quality controls for reliability. It shares the core architecture with commercial variants but differs in environmental rating, manufacturing site exclusivity, and traceability documentation suitable for long-life defense programs.

Replacement Considerations

Direct replacements within the same enhanced product line include AD7923SRUZ-EP and AD7923SRUZ-EP-RL7. These alternatives offer identical electrical and environmental specifications but differ in RoHS compliance status and shipping packaging type.

FAQ

What is the function of the VDRIVE pin?

The VDRIVE pin supplies the logic power for the serial interface, allowing the digital I/O levels to operate at either 3 V or 5 V independently of the analog supply voltage (AVDD).

How does the channel sequencer operate?

The sequencer allows preprogramming of the conversion order for the four single-ended inputs using the SEQ1 and SEQ0 bits in the control register, enabling automatic sequential sampling without processor intervention.

What is the maximum input frequency the device can handle?

The internal track-and-hold amplifier has a wide bandwidth that can handle input frequencies in excess of 8 MHz, supporting a full power bandwidth of 8.2 MHz typ.