AD7858BNZ

Overview

The AD7858BNZ is a high-speed, low-power 12-bit analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and supports a throughput rate of 200 kSPS. The device features eight single-ended or four pseudo-differential analog input channels with a range of 0 V to V_REF. It utilizes a successive approximation register (SAR) architecture and includes system and self-calibration capabilities that activate on power-up. The component communicates via a flexible serial interface compatible with SPI, QSPI, and 8051 protocols. It is housed in a 24-lead plastic dual-in-line package (DIP).

Feature Summary

• Integrated system and self-calibration with automatic calibration on power-up.
• Flexible serial interface compatible with SPI, QSPI, and 8051 microprocessors.
• Configurable for eight single-ended or four pseudo-differential input channels.
• Automatic power-down mode after conversion to minimize energy consumption.

Applications

• Battery-powered systems such as personal digital assistants and medical instruments.
• Pen computers and portable instrumentation devices.
• Industrial control systems requiring multi-channel data acquisition.
• High-speed modem applications.

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature grade. The 'B' designation indicates a specific linearity error grade, while 'N' denotes the plastic DIP package. Confirm availability status with authorized distributors as stock levels fluctuate. Ensure the voltage supply range matches the application requirements before procurement.

Selection Notes

Select the AD7858BNZ when a 200 kSPS sampling rate is required alongside 12-bit resolution. This model is suitable for designs needing multiple analog inputs within a single integrated circuit. Consider the power dissipation specifications if thermal management is critical. Verify that the serial interface timing meets the host controller's clock speed limitations.

Part Context

This component belongs to the AD7858 family of 12-bit sampling ADCs. The family includes variants optimized for different performance trade-offs, such as the AD7858L which offers lower power consumption at a reduced 100 kSPS rate. The AD7858 series is designed for applications balancing speed and power efficiency in single-supply environments.

Replacement Considerations

The AD7858ANZ serves as a direct alternative with identical electrical characteristics but potentially different linearity grading. The AD7858LARZ is a surface-mount option offering similar functionality in an SOIC package. Evaluate pin compatibility and thermal performance when substituting these parts.