Overview
The AD8212WYRMZ-R7, produced by Analog Devices Inc., is a high common-mode voltage current shunt monitor. This device is designed to accurately amplify small differential input voltages in the presence of large common-mode voltages, making it suitable for a variety of high-voltage applications. The AD8212 features an integrated regulator that maintains a constant 5 V between the supply terminal and the common point of the internal circuitry, ensuring stable operation over a wide voltage range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (V+) | 7 | - | 65 | V |
| Regulator Nominal Value | 4.80 | 5 | 5.20 | V |
| PSRR (7 V ≤ V+ ≤ 65 V) | - | - | 80 | dB |
| Bias Current (IBIAS) | 185 | 200 | 1000 | µA |
| Dynamic Response - Small Signal −3 dB Bandwidth (Gain = 10) | - | - | 1000 | kHz |
| Dynamic Response - Small Signal −3 dB Bandwidth (Gain = 20) | - | - | 500 | kHz |
| Dynamic Response - Small Signal −3 dB Bandwidth (Gain = 50) | - | - | 100 | kHz |
| Settling Time (Within 0.1% of the true output, gain = 20) | - | - | 2 | µs |
| Temperature Range for Specified Performance (TOPR) | -40 | - | 125 | °C |
| Common Mode Rejection Ratio (CMRR) | - | - | 100 | dB |
| Input Bias Current (Ib) | - | - | 200 | µA |
| Input Offset Voltage (Vos) | - | - | 2 | mV |
Key Features
- High Common-Mode Voltage Range: The AD8212 can operate with common-mode voltages up to 65 V and can be extended to over 500 V with an external PNP transistor.
- Integrated Regulator: Features an internal series regulator that maintains a constant 5 V between the supply terminal and the common point of the internal circuitry.
- Output Current Compensation: Allows for excellent output current accuracy using any PNP transistor, reducing the need for additional components like Zener regulators and FET devices.
- High Accuracy and Reliability: Ensures high output current accuracy and reliability due to the lower component count.
- Dynamic Response: Offers fast settling times and high bandwidth, making it suitable for applications requiring rapid response times.
Applications
- General High-Side Current Sensing: Ideal for monitoring current in high-voltage systems.
- Motor Control: Used in motor control systems to monitor and control current accurately.
- 500 V Current Monitoring: Suitable for high-voltage applications such as industrial power supplies and automotive systems.
- Bidirectional Current Sensing: Can be used to sense current in both directions, making it versatile for various applications.
Q & A
- What is the maximum supply voltage for the AD8212?
The maximum supply voltage for the AD8212 is 65 V.
- How can the common-mode voltage range be extended?
The common-mode voltage range can be extended to over 500 V by using an external PNP transistor.
- What is the typical bias current of the AD8212?
The typical bias current (IBIAS) of the AD8212 is 200 µA.
- What is the settling time of the AD8212 for a gain of 20?
The settling time within 0.1% of the true output for a gain of 20 is 2 µs.
- What is the temperature range for specified performance of the AD8212?
The temperature range for specified performance is −40°C to +125°C.
- What is the common-mode rejection ratio (CMRR) of the AD8212?
The CMRR of the AD8212 is 100 dB.
- How does the output current compensation circuit work?
The output current compensation circuit ensures that the base current of the external PNP transistor is mirrored inside the AD8212, maintaining excellent output current accuracy.
- What package options are available for the AD8212WYRMZ-R7?
The AD8212WYRMZ-R7 is available in an 8-Lead MSOP package.
- Is the AD8212 RoHS compliant?
Yes, the AD8212WYRMZ-R7 is RoHS compliant.
- What are some typical applications of the AD8212?
Typical applications include general high-side current sensing, motor control, 500 V current monitoring, and bidirectional current sensing.
