AD7812YNZ

Overview

The AD7812YNZ is a high-speed, low-power 10-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features eight single-ended input channels that can be configured as seven pseudo-differential inputs or four independent pseudo-differential pairs. The device operates from a single 2.7 V to 5.5 V supply and includes an onboard track-and-hold amplifier, a 2.3 µs successive approximation A/D converter, and a 2.5 V internal reference with ±2.5% accuracy. It utilizes a DSP- and microcontroller-compatible serial interface for data transfer. The component is housed in a 20-lead plastic dual-in-line package (PDIP) and supports automatic power-down modes to minimize energy consumption at lower throughput rates.

Feature Summary

• Eight configurable analog input channels supporting single-ended and pseudo-differential configurations via control registers.
• Integrated 2.5 V reference circuitry with the option to utilize external references through the VREF pin.
• High-speed serial interface compatible with standard digital signal processors and microcontrollers.
• Automatic power-down functionality triggered at the end of conversion cycles to reduce overall power dissipation.

Applications

• Multipoint data acquisition systems requiring multiple channel sampling.
• Industrial process control applications involving sensor signal conditioning.
• Battery-powered instrumentation where low power consumption is critical.
• Automotive electronic systems requiring qualified components.

Procurement Notes

Verify the specific ordering suffix YNZ corresponds to the 20-lead PDIP package variant when sourcing. Confirm that the required operating temperature range aligns with the specified -40°C to +105°C limits. Ensure that the system design accommodates the serial interface timing requirements, particularly the setup and hold times for the SCLK and frame sync signals. Check for any automotive qualification markings if the application demands compliance with specific industry standards.

Selection Notes

Select the AD7812YNZ when eight input channels are necessary within a single integrated circuit solution. Consider this part for designs requiring pseudo-differential input configurations to improve noise immunity without additional external components. Evaluate the power consumption characteristics against the system's throughput requirements, utilizing the automatic power-down mode for battery-operated applications. Ensure the available serial clock frequency meets the timing constraints defined in the specifications table.

Part Context

The AD7812 is part of the AD7811/AD7812 family of 10-bit sampling ADCs from Analog Devices. While the AD7811 provides four channels, the AD7812 expands this capability to eight channels while maintaining identical performance metrics regarding resolution, speed, and power efficiency. Both devices share the same architectural foundation, including the charge redistribution DAC and serial interface logic, allowing for scalable multi-chip bus configurations using the address pin.

Replacement Considerations

The AD7812YR serves as a surface-mount alternative offering identical electrical specifications but packaged in a 20-lead SOIC format. Designers requiring a smaller footprint may consider the AD7812YRU, which utilizes a 20-lead TSSOP package. These variants maintain functional compatibility regarding pinout and control register operations, facilitating direct board layout modifications without schematic changes.