AD7933BRU

Overview

The AD7933BRU is a 10-bit, high-speed successive approximation analog-to-digital converter (ADC) featuring four multiplexed analog input channels with an integrated sequencer. It operates from a single 2.7 V to 5.25 V supply and achieves throughput rates up to 1.5 MSPS. The device includes a low-noise differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Key specifications include a maximum power dissipation of 6 mW at 3 V and 13.5 mW at 5 V. It features software-configurable inputs for single-ended, fully differential, or pseudo-differential modes, an accurate on-chip 2.5 V reference, and a high-speed parallel interface compatible with 3 V or 5 V processor systems via the VDRIVE function.

Feature Summary

• Four analog input channels with a programmable channel sequencer for automated conversion sequences.
• Software-selectable analog input configurations supporting single-ended, fully differential, and pseudo-differential modes.
• Integrated precise 2.5 V internal voltage reference with options for external reference overdrive.
• High-speed parallel interface with word/byte transfer modes and independent logic level control via VDRIVE.

Applications

• Portable instrumentation requiring low power consumption and high throughput.
• Industrial process control systems utilizing multi-channel data acquisition.
• Medical instruments needing precise signal conditioning and isolation capabilities.
• Automated test equipment (ATE) requiring fast sampling rates and flexible input configurations.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure correct package type and temperature range. Confirm that the BRU suffix corresponds to the TSSOP-28 package and commercial operating temperature range as specified in the official documentation. Cross-reference part numbers with authorized distributors to ensure authenticity and compliance with RoHS standards.

Selection Notes

Select the AD7933BRU when a 10-bit resolution is sufficient for the application, offering lower power consumption compared to the 12-bit AD7934 variant. Ensure the system design accommodates the 28-lead TSSOP package dimensions. Verify that the required throughput rate does not exceed 1.5 MSPS and that the parallel interface timing constraints align with the microprocessor or DSP clock speeds available in the target system architecture.

Part Context

The AD7933 belongs to the AD793x family of high-speed, low-power SAR ADCs from Analog Devices. This series is designed for applications requiring multiple analog inputs with minimal power usage. The AD7933 specifically provides 10-bit resolution, distinguishing it from the AD7934 which offers 12-bit resolution. Both share identical pinouts, interfaces, and functional blocks, allowing for potential design flexibility based on resolution requirements.

Replacement Considerations

The AD7934BRU is a direct pin-compatible replacement offering 12-bit resolution instead of 10-bit. Other related devices include the AD7938 and AD7939, which provide eight channels. Ensure that any substitute maintains the same 28-lead TSSOP package and voltage supply ranges to avoid PCB redesign.