Datasheet Analog Devices AD8451ASTZ

Low Cost, Precision Analog Front End and
Controller for Battery Test/Formation Systems AD8451 Data Sheet
FEATURES GENERAL DESCRIPTION Integrated constant current and voltage modes with
automatic switchover
Charge and discharge modes
Precision voltage and current measurement
Integrated precision control feedback blocks
Precision interface to PWM or linear power converters
Fixed gain settings
Current sense gain: 26 V/V (typ)
Voltage sense gain: 0.8 V/V (typ)
Excellent ac and dc performance
Maximum offset voltage drift: 0.9 µV/°C
Maximum gain drift: 3 ppm/°C
Low current sense amplifier input voltage noise: 9 nV/√Hz typ
Current sense CMRR: 108 dB min
TTL compliant logic The AD8451 is a precision analog front end and controller for
testing and monitoring battery cells. A precision fixed gain
instrumentation amplifier (IA) measures the battery charge/
discharge current, and a fixed gain difference amplifier (DA)
measures the battery voltage (see Figure 1). Internal laser
trimmed resistor networks set the gains for the IA and the DA,
optimizing the performance of the AD8451 over the rated …