AD7858LANZ

Overview

The AD7858LANZ is a high-speed, low-power 12-bit analog-to-digital converter (ADC) from Analog Devices Inc., operating on a single 3 V to 5.5 V supply. It features an 8-channel multiplexer supporting single-ended or pseudo-differential inputs and utilizes a successive approximation register (SAR) architecture. The device achieves a throughput rate of 100 kSPS with a typical power dissipation of 6.85 mW at 3 V. It includes system and self-calibration capabilities, automatic calibration on power-up, and flexible serial interface compatibility with SPI, QSPI, and 8051 protocols. The component is housed in a 24-lead plastic dual-in-line package (PDIP).

Feature Summary

• Integrated system and self-calibration with automatic initialization upon power-up.
• Flexible serial interface compatible with standard microprocessor buses including SPI and QSPI.
• Low power consumption with automatic power-down modes following conversion cycles.
• Supports eight single-ended or four pseudo-differential analog input channels.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices.
• Medical instruments requiring precise signal acquisition.
• Pen computers and portable instrumentation.
• Industrial control systems and high-speed modems.

Procurement Notes

Verify the specific ordering suffix 'LANZ' against current manufacturer documentation to confirm package type and temperature grade. Confirm availability status as distribution channels may list end-of-life or obsolete statuses for this component. Ensure that the required PDIP-24 package aligns with PCB layout constraints before finalizing procurement orders.

Selection Notes

Select the AD7858LANZ when a 100 kSPS sampling rate and 12-bit resolution are sufficient for the application. Consider this part for designs requiring low power consumption under a single 3 V or 5 V supply. Verify that the 24-lead PDIP package fits the mechanical design. Evaluate if the integrated calibration features reduce the need for external precision components.

Part Context

The AD7858LANZ belongs to the AD7858 family of 12-bit ADCs manufactured by Analog Devices. This series distinguishes between speed-optimized and low-power variants. The 'L' designation indicates the low-power version optimized for battery operation. The 'ANZ' suffix typically denotes the lead-free PDIP package variant within the product line.

Replacement Considerations

Direct replacements include other members of the AD7858 family such as the AD7858BRZ for surface mount applications. Cross-reference pinouts and electrical specifications carefully when substituting packages. Verify that the replacement part supports the required 100 kSPS throughput and 12-bit accuracy.