Overview
The AD8225ARZ-RL, produced by Analog Devices Inc., is a precision instrumentation amplifier with a fixed gain of 5. This device sets new standards of performance in the field of instrumentation amplifiers. It is designed to operate on either single or dual supplies, making it versatile for various applications. The AD8225 is known for its superior common-mode rejection ratio (CMRR), which enables the rejection of high-frequency common-mode voltage, thus reducing noise from utility lines, industrial equipment, and other radiating sources. This amplifier 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 | - | 10 | ppm |
| Offset Voltage (RTI) | - | 50 | 150 | - | µV |
| Offset Drift | - | 0.3 | - | 2 | µV/°C |
| Input Bias Current | - | - | - | 1.2 nA | nA |
| Input Operating Impedance (Differential) | - | 10^12 | - | - | Ω||pF |
| Input Voltage Range (Common-Mode) | - | -VS + 1.6 | - | +VS - 1.0 | V |
| Slew Rate | - | 5 | - | - | V/µs |
| Supply Voltage Range | - | 3.4 | - | 36 | V |
| Quiescent Current | - | 1.05 | 1.2 | - | mA |
| Operating Temperature Range | - | -40 | - | 85 | °C |
Key Features
- Fixed Gain of 5: The AD8225 has a highly stable, factory-trimmed gain of 5, eliminating the need for external gain-setting components.
- High CMRR: Superior common-mode rejection ratio (CMRR) of 80 dB minimum at 10 kHz, ensuring effective rejection of high-frequency common-mode voltage.
- Low Power Consumption: Low quiescent current of 1.2 mA maximum, making it suitable for power-sensitive applications.
- Wide Supply Range: Operates on single or dual supplies from 3.4 V to 36 V, and ±1.7 V to ±18 V, respectively.
- High Slew Rate: A minimum slew rate of 5 V/µs, ensuring excellent dynamic performance.
- Low Input Offset Voltage and Drift: Low input offset voltage of 150 µV maximum and low offset drift of 2 µV/°C maximum, contributing to outstanding DC precision.
- Low Input Bias Current: Low input bias current of 1.2 nA maximum, reducing errors in high-impedance source applications.
Applications
- Patient Monitors: Suitable for patient monitoring applications due to its high CMRR and ability to reject high common-mode voltages.
- Current Transmitters: Used in current transmitter applications where precision and stability are crucial.
- Multiplexed Systems: Ideal for multiplexed systems where multiple signals need to be conditioned and amplified.
- 4 to 20 mA Converters: Utilized in 4 to 20 mA converter applications for precise signal conditioning.
- Bridge Transducers and Sensor Signal Conditioning: Effective in bridge transducer and sensor signal conditioning applications due to its high precision and low noise characteristics.
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 minimum.
- What is the operating temperature range of the AD8225?
The operating temperature range of the AD8225 is –40°C to +85°C.
- What is the quiescent current of the AD8225?
The quiescent current of the AD8225 is 1.2 mA maximum.
- Can the AD8225 operate on single or dual supplies?
Yes, the AD8225 can operate on either single or dual supplies.
- What is the input bias current of the AD8225?
The input bias current of the AD8225 is 1.2 nA maximum.
- In what package is the AD8225 available?
The AD8225 is available in an 8-lead SOIC package.
- What are some typical applications of the AD8225?
The AD8225 is typically used in patient monitors, current transmitters, multiplexed systems, 4 to 20 mA converters, and bridge transducers and sensor signal conditioning.
