Overview
The AD8225AR, produced by Analog Devices Inc., is a precision instrumentation amplifier with a fixed gain of 5. It is designed to offer high performance and reliability in various signal conditioning applications. The AD8225 sets new standards in instrumentation amplifiers with its superior common-mode rejection ratio (CMRR), low gain drift, and low input offset voltage. This amplifier operates on either single or dual supplies, making it versatile for different application requirements.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| GAIN | 5 | V/V | |||
| Gain Error | -0.1 | +0.1 | % | ||
| Nonlinearity | ±2 | ±10 | ppm | ||
| Nonlinearity vs. Temperature | ±1 | ±5 | ppm/°C | ||
| Offset Voltage (RTI) | 50 | 150 | µV | ||
| Offset Voltage vs. Temperature | 0.3 | 2 | µV/°C | ||
| Input Operating Impedance (Differential) | 10^12 Ω || 2 pF | ||||
| Input Operating Impedance (Common Mode) | 10^12 Ω || 2 pF | ||||
| Input Voltage Range (Common-Mode) | -VS + 1.6 to +VS - 1.0 | V | |||
| CMRR | DC | 86 | dB | ||
| CMRR | 10 kHz | 80 | dB | ||
| Slew Rate | 5 | V/µs | |||
| Supply Current | 1.2 | mA | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- No External Components Required: The AD8225 does not require external components to set the gain, making it a convenient choice for many applications.
- Highly Stable Gain: The AD8225 has a highly stable, factory-trimmed gain of 5.
- Low Power Consumption: It operates with a low supply current of 1.2 mA maximum.
- Wide Power Supply Range: The amplifier can operate on single or dual supplies ranging from ±1.7 V to ±18 V.
- Excellent Dynamic Performance: Features a high slew rate of 5 V/µs and excellent CMRR of 86 dB at DC and 80 dB at 10 kHz.
- Outstanding DC Precision: Low gain drift of 5 ppm/°C, low input offset voltage of 150 µV, and low offset drift of ±2 µV/°C.
- Low Input Bias Current: Maximum input bias current of 1.2 nA.
Applications
- Patient Monitors: Suitable for patient monitoring applications due to its high CMRR and ability to reject high-frequency noise.
- 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: Employed in 4 to 20 mA converter applications for precise signal conditioning.
- Bridge Transducers and Sensor Signal Conditioning: Used for conditioning signals from bridge transducers and other sensors.
Q & A
- What is the fixed gain of the AD8225AR?
The AD8225AR has a fixed gain of 5.
- What is the CMRR of the AD8225AR at DC and 10 kHz?
The CMRR is 86 dB at DC and 80 dB at 10 kHz.
- What is the slew rate of the AD8225AR?
The slew rate is 5 V/µs minimum.
- What is the input offset voltage and its drift?
The input offset voltage is 150 µV maximum, with a drift of ±2 µV/°C.
- What is the operating temperature range of the AD8225AR?
The operating temperature range is -40°C to +85°C.
- Can the AD8225AR operate on single or dual supplies?
Yes, it can operate on both single and dual supplies ranging from ±1.7 V to ±18 V.
- What is the maximum input bias current of the AD8225AR?
The maximum input bias current is 1.2 nA.
- What are some common applications of the AD8225AR?
Common applications include patient monitors, current transmitters, multiplexed systems, 4 to 20 mA converters, and bridge transducers.
- Does the AD8225AR require external components to set the gain?
No, the AD8225AR does not require external components to set the gain.
- What is the package type of the AD8225AR?
The AD8225AR is packaged in an 8-lead SOIC package.
