AD7812WYRUZ

Overview

The AD7812WYRUZ is a high-speed, low-power 10-bit analog-to-digital converter featuring eight single-ended input channels. It operates from a single 2.7 V to 5.5 V supply and includes an on-chip track-and-hold amplifier and a 2.5 V reference. The device supports a throughput rate of 350 kSPS with a conversion time of 2.3 µs. It utilizes a DSP-compatible serial interface and offers software-controlled power-down modes to minimize energy consumption during idle periods.

Feature Summary

• Eight configurable analog input channels supporting single-ended or pseudo-differential configurations via control register settings.
• Integrated 2.5 V reference circuitry with provision for external reference inputs to optimize noise performance.
• Hardware and software control capabilities for conversion initiation and automatic power-down between sampling cycles.

Applications

• Industrial data acquisition systems requiring multi-channel signal monitoring.
• Battery-powered instrumentation benefiting from low-power operation and single-supply compatibility.
• Automotive electronic control units utilizing qualified components for harsh environments.

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature range. Ensure that the component matches the required pinout and electrical specifications for the target application design. Cross-reference part numbers with official distributor catalogs to confirm availability and authenticity before finalizing procurement plans.

Selection Notes

Select this component when multiple analog inputs are required within a compact footprint. Evaluate the trade-off between the integrated reference accuracy and the need for external precision references based on system noise requirements. Confirm that the serial interface timing aligns with the host microcontroller or DSP clock speeds.

Part Context

This model belongs to the AD7811/AD7812 family of successive approximation register ADCs. The AD7812 variant specifically provides eight input channels compared to the four channels in the AD7811. Both share identical core architecture, power characteristics, and serial interface protocols, differing primarily in channel count and package lead configuration.

Replacement Considerations

Direct replacements include other ADI 10-bit SAR ADCs with similar channel counts and serial interfaces. Verify pin compatibility and register mapping when substituting with newer generations of ADCs to ensure seamless integration without hardware redesign.

FAQ

How are the eight input channels configured?

The channels can be configured as eight single-ended inputs referenced to AGND, seven pseudo-differential pairs relative to VIN8, or four independent pseudo-differential pairs using the control register bits.

What is the function of the A0 pin?

The A0 pin serves as a package address input, allowing two devices to share the same serial bus by hardwiring the pin high or low to match the address bit in the control register.

Can the internal reference be disabled?

Yes, by setting the EXTREF bit in the control register, the user can disable the on-chip reference and utilize an external reference voltage connected to the VREF pin.