AD8450ASTZ

Overview

The AD8450ASTZ is a precision analog front end and controller designed for battery cell formation and testing systems. It integrates a programmable gain instrumentation amplifier (PGIA) for current sensing with gains of 26, 66, 133, or 200 V/V, and a programmable gain difference amplifier (PGDA) for voltage sensing with gains of 0.2, 0.27, 0.4, or 0.8 V/V. The device supports automatic constant current to constant voltage switching and includes internal laser-trimmed resistor networks for stable performance across the -40°C to +85°C operating range. It features integrated overvoltage/overcurrent detection, current sharing capabilities, and a TTL-compliant MODE input for charge/discharge selection.

Feature Summary

• Integrated PGIA with fixed gains of 26, 66, 133, and 200 V/V for precise current measurement
• Integrated PGDA with fixed gains of 0.2, 0.27, 0.4, and 0.8 V/V for accurate voltage monitoring
• Automatic CC/CV mode transition with analog output (VCTRL) for PWM controller interface
• Built-in fault detection including programmable overvoltage and overcurrent comparators

Applications

• Battery cell formation and testing
• Battery module testing

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors. Confirm package integrity for the 80-lead LQFP format. Ensure compliance with RoHS directives as specified in official documentation. Cross-reference ordering suffixes against manufacturer catalogs to confirm availability and specific variant characteristics.

Selection Notes

Select appropriate gain settings by connecting RGP/RGN pins to the corresponding ISGPx/ISGNx network pins based on required current sense resolution. Configure BVPx/BVNx inputs to match the desired voltage sense gain. Ensure supply voltages remain within the AVCC (+5V to +36V) and AVEE (-31V to 0V) ranges during operation.

Part Context

The AD8450 belongs to the AD8450 series of precision analog front ends. It is specifically engineered for high-accuracy battery management applications requiring simultaneous current and voltage monitoring with integrated control loops.

Replacement Considerations

Consult Analog Devices documentation for direct pin-compatible alternatives within the AD8450 family. Verify functional equivalence regarding gain configurations and interface compatibility before substitution.