Overview
The AD8225ARZ-R7, produced by Analog Devices Inc., is a precision instrumentation amplifier with a fixed gain of 5. This device is designed to offer high performance and reliability in various applications, particularly where high common-mode rejection ratio (CMRR) and low noise are critical. The AD8225 operates on either single or dual supplies, making it versatile for different system configurations. It is packaged in an 8-lead SOIC package and is specified over the standard industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| GAIN | 5 | V/V | |||
| GAIN Error | -0.1% | +0.05% | +0.1% | % | |
| Nonlinearity | 2 ppm | 10 ppm | ppm | ||
| OFFSET VOLTAGE (RTI) | 50 µV | 150 µV | µV | ||
| OFFSET VOLTAGE vs. Temperature | 0.3 µV/°C | 2 µV/°C | µV/°C | ||
| INPUT Operating Impedance Differential | 10^12 Ω||pF | Ω||pF | |||
| INPUT Voltage Range (Common-Mode) | -VS + 1.6 V | +VS - 1.0 V | V | ||
| POWER SUPPLY Operating Range | 1.7 V | 36 V | V | ||
| Quiescent Current | 1.05 mA | 1.2 mA | mA | ||
| TEMPERATURE RANGE For Specified Performance | -40°C | +85°C | °C |
Key Features
- High CMRR: The AD8225 offers a high common-mode rejection ratio (CMRR) of 80 dB minimum at 10 kHz, ensuring effective rejection of high-frequency common-mode voltage.
- Low Offset Voltage and Drift: The device features a low input offset voltage of 150 µV maximum and a low offset drift of 2 µV/°C maximum.
- Low Input Bias Current: With a low input bias current of 1.2 nA maximum, the AD8225 is suitable for applications requiring minimal input current.
- Wide Supply Range: The amplifier can operate on single or dual supplies ranging from 1.7 V to 36 V.
- High Slew Rate: The AD8225 has a slew rate of 5 V/µs, which is comparable to many op-amp circuits.
Applications
- Patient Monitors: The AD8225 is well-suited for patient monitoring applications due to its high CMRR and low noise characteristics.
- Current Transmitters: It is used in current transmitter applications where precision and stability are crucial.
- Multiplexed Systems: The amplifier is suitable for multiplexed systems where multiple signals need to be processed.
- 4 to 20 mA Converters: It can be used in 4 to 20 mA converter applications.
- Bridge Transducers and Sensor Signal Conditioning: The AD8225 is ideal for extracting low-level differential signals in the presence of high common-mode DC voltage levels.
Q & A
- What is the fixed gain of the AD8225?
The AD8225 has a fixed gain of 5. - What is the CMRR of the AD8225 at 10 kHz?
The CMRR of the AD8225 is 80 dB minimum at 10 kHz. - What is the input offset voltage of the AD8225?
The input offset voltage of the AD8225 is 150 µV maximum. - What is the slew rate of the AD8225?
The slew rate of the AD8225 is 5 V/µs. - What is the operating temperature range of the AD8225?
The AD8225 operates over a temperature range of –40°C to +85°C. - Can the AD8225 operate on single or dual supplies?
Yes, the AD8225 can operate on either single or dual supplies ranging from 1.7 V to 36 V. - What is the typical quiescent current of the AD8225?
The typical quiescent current of the AD8225 is 1.2 mA. - What are some common applications of the AD8225?
The AD8225 is commonly used in patient monitors, current transmitters, multiplexed systems, 4 to 20 mA converters, and bridge transducers. - What is the package type of the AD8225?
The AD8225 is packaged in an 8-lead SOIC package. - How does the AD8225 handle high common-mode DC voltage levels?
The AD8225 can extract low-level differential signals in the presence of high common-mode DC voltage levels due to its extended common-mode voltage range.
