AD7812YN

Overview

The AD7812YN is a high-speed, low-power 10-bit successive-approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features eight single-ended input channels that can be configured as pseudo-differential inputs. The device operates from a single 2.7 V to 5.5 V supply and includes an onboard track-and-hold amplifier and a 2.5 V reference circuit. It supports a throughput rate of 350 kSPS with a conversion time of 2.3 µs. The component utilizes a DSP/microcontroller-compatible serial interface and is housed in a 20-lead plastic dual-in-line package (N-20).

Feature Summary

• Eight-channel multiplexing capability with configurable single-ended or pseudo-differential input modes.
• Integrated 2.5 V reference circuitry with option for external reference selection.
• Hardware and software control for conversion start and automatic power-down modes.
• Package address pin allows sharing of the serial bus in multi-package applications.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Battery-powered instrumentation benefiting from low power consumption and single-supply operation.
• Automotive applications qualified under automotive standards.

Procurement Notes

Verify the specific ordering suffix 'YN' corresponds to the 20-lead Plastic DIP (N-20) package configuration as listed in the official Analog Devices Ordering Guide. Confirm that the Y version specifications, including linearity error and power dissipation limits, match the design requirements. Ensure compatibility with the intended serial clock frequencies and logic voltage levels for the microcontroller interface.

Selection Notes

Select this component when eight analog channels are required within a single IC footprint. The AD7812 is suitable for applications needing moderate speed up to 350 kSPS with 10-bit resolution. Consider the onboard 2.5 V reference if system accuracy permits its ±2.5% tolerance; otherwise, utilize the external reference input for higher precision. Verify that the 20-lead DIP package fits the available PCB space and assembly constraints.

Part Context

The AD7812 is part of the AD7811/AD7812 family of 10-bit sampling ADCs. While the AD7811 provides four channels, the AD7812 offers eight channels, sharing identical core architecture, performance metrics, and interface protocols. Both devices are designed for low-power, single-supply operation and feature compatible serial interfaces for easy integration into existing digital signal processing or microcontroller-based systems.

Replacement Considerations

The AD7811 serves as a functional substitute if only four channels are required, sharing the same electrical characteristics and package options. Other members of the AD7812 family, such as AD7812YR (SOIC) or AD7812YRU (TSSOP), offer alternative packaging but maintain identical functionality.