AD8451 Precision Analog Front-End & Controller

Analog Devices Inc. AD8451 Precision Analog Front-End & Controller is designed to test and monitor battery cells. AD8451's precision fixed gain instrumentation amplifier (IA) measures the battery charge/discharge current, and a fixed gain difference amplifier (DA) measures the battery voltage. Internal laser trimmed resistor networks set the gains for the IA and the DA, optimizing the performance of the AD8451 over the rated temperature range. The IA gain is 26 and the DA gain is 0.8. Voltages at the ISET and VSET inputs set the desired constant current (CC) and constant voltage (CV) values. AD8451's CC to CV switching is automatic and transparent to the system.