AD8451ASTZ

Overview

The AD8451ASTZ is a precision analog front end and controller designed for battery cell formation and testing systems. It integrates a fixed-gain instrumentation amplifier (26 V/V) for current sensing and a difference amplifier (0.8 V/V) for voltage measurement, both utilizing internal laser-trimmed resistor networks to ensure stability across the operating temperature range of −40°C to +85°C. The device supports automatic constant current to constant voltage switching and features a TTL-compliant MODE input for charge/discharge selection. It interfaces directly with PWM controllers via its VCTRL output pin.

Feature Summary

• Integrated precision instrumentation amplifier with 26 V/V gain and 0.1% gain error
• Built-in difference amplifier with 0.8 V/V gain for accurate battery voltage monitoring
• Automatic transition between constant current and constant voltage modes
• TTL logic compatible MODE input for selecting charge or discharge operation

Applications

• Battery cell formation and testing equipment
• Battery module testing systems
• Precision power converter control loops for energy storage applications

Procurement Notes

Verify the specific ordering suffix ASTZ against the manufacturer's official documentation to confirm package type and lead-free status. Confirm that the required supply voltages (AVCC, AVEE, DVCC) align with the system design before procurement.

Selection Notes

Select this component when high-precision current and voltage monitoring are required for battery test stations. Ensure the external power supplies can provide the necessary ±15V analog rails and 5V digital rail. Verify that the 80-lead LQFP package fits the PCB layout constraints.

Part Context

This part belongs to the Analog Devices AD845x family of analog front ends. While similar to the AD8452, the AD8451 offers distinct gain configurations and pinouts optimized for specific battery testing architectures. It serves as a dedicated interface between the battery cell and the main power conversion controller.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified source material.