Overview
The AD8451ASTZ-RL, produced by Analog Devices Inc., is a precision analog front end and controller designed specifically for testing and monitoring battery cells. This component integrates a fixed gain instrumentation amplifier (IA) for measuring battery charge/discharge current and a fixed gain difference amplifier (DA) for measuring battery voltage. It offers automatic switchover between constant current (CC) and constant voltage (CV) modes, making it highly versatile for battery management systems. The AD8451ASTZ-RL is known for its excellent accuracy, performance over temperature, and reliability, making it an ideal choice for battery cell formation and testing applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range (AVCC - AVEE) | 5 | 36 | V | |
| Digital Supply Voltage (DVCC - DGND) | 3 | 5 | V | |
| Operating Temperature Range | -40 | +85 | °C | |
| Current Sense Gain | 26 | V/V | ||
| Voltage Sense Gain | 0.8 | V/V | ||
| Maximum Offset Voltage Drift | 0.9 | µV/°C | ||
| Maximum Gain Drift | 3 | ppm/°C | ||
| Current Sense Amplifier Input Voltage Noise | 9 | nV/√Hz | ||
| Current Sense CMRR | 108 | dB | ||
| Package Type | 80-lead LQFP |
Key Features
- Integrated constant current and voltage modes with automatic switchover.
- Precision voltage and current measurement.
- Integrated precision control feedback blocks.
- Precision interface to PWM or linear power converters.
- Fixed gain settings: Current sense gain of 26 V/V and voltage sense gain of 0.8 V/V.
- Excellent AC and DC performance.
- Low current sense amplifier input voltage noise.
- High current sense CMRR (Common Mode Rejection Ratio) of 108 dB.
- TTL compliant logic for mode selection (charge/discharge).
- Analog output (VCTRL) interfaces directly with PWM controllers like the ADP1972.
Applications
- Battery cell formation and testing.
- Battery module testing.
Q & A
- What is the primary function of the AD8451ASTZ-RL?
The primary function of the AD8451ASTZ-RL is to serve as a precision analog front end and controller for testing and monitoring battery cells. - What are the operating voltage ranges for the AD8451ASTZ-RL?
The operating voltage range is from 5V to 36V for the analog supply (AVCC - AVEE) and from 3V to 5V for the digital supply (DVCC - DGND). - What are the typical gains for the current sense and voltage sense amplifiers?
The typical gain for the current sense amplifier is 26 V/V, and for the voltage sense amplifier, it is 0.8 V/V. - What is the maximum offset voltage drift and maximum gain drift of the AD8451ASTZ-RL?
The maximum offset voltage drift is 0.9 µV/°C, and the maximum gain drift is 3 ppm/°C. - What is the current sense amplifier input voltage noise?
The current sense amplifier input voltage noise is typically 9 nV/√Hz. - What is the package type of the AD8451ASTZ-RL?
The AD8451ASTZ-RL is available in an 80-lead LQFP package. - What are the operating temperature ranges for the AD8451ASTZ-RL?
The operating temperature range is from -40°C to +85°C. - How does the AD8451ASTZ-RL switch between constant current and constant voltage modes?
The AD8451ASTZ-RL switches between constant current and constant voltage modes automatically and transparently to the system. - What type of logic does the AD8451ASTZ-RL use for mode selection?
The AD8451ASTZ-RL uses TTL compliant logic for mode selection (charge/discharge). - What is the typical quiescent current for the analog and digital supplies?
The typical quiescent current for the analog supply (AVCC) is 7-10 mA, and for the digital supply (DVCC), it is 40-70 µA.
