Overview
The AD8227ARZ-RL, produced by Analog Devices Inc., is a low-cost, wide supply range instrumentation amplifier. It is designed to work with a variety of signal voltages and requires only one external resistor to set any gain between 5 and 1000. This amplifier features a wide input range and rail-to-rail output, allowing the signal to make full use of the supply rails. It can operate on single or dual supplies, ranging from 2.2 V to 36 V for single supply and ±1.5 V to ±18 V for dual supplies. The AD8227 is ideal for multichannel, space-constrained applications and is available in 8-lead SOIC and MSOP packages, fully specified for operation from −40°C to +125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Gain Range | 5 to 1000 |
| Gain Setting | Single external resistor |
| Input Voltage Range | Beyond supply rails (e.g., ±35 V with ±5 V supply) |
| Power Supply Range | Single supply: 2.2 V to 36 V, Dual supply: ±1.5 V to ±18 V |
| Bandwidth (G = 5) | 250 kHz |
| CMRR (G = 5) | 100 dB minimum (B Grade) |
| Input Noise | 24 nV/√Hz |
| Typical Supply Current | 350 μA |
| Operating Temperature | −40°C to +125°C |
| Package | 8-lead SOIC and MSOP |
Key Features
- Wide input range that can go below the negative supply, allowing small signals near ground to be amplified without requiring dual supplies.
- Robust inputs designed to connect to real-world sensors, capable of handling voltages beyond the supply rails.
- Rail-to-rail output, enabling the signal to make full use of the supply rails.
- Low cost and high performance, making it suitable for multichannel, space-constrained applications.
- Minimum and maximum input bias currents specified for open wire detection.
- Reference terminal for output voltage offset, useful for driving single-supply ADCs.
Applications
- Multichannel, space-constrained industrial applications.
- Tightly packed, zero airflow designs.
- Real-world sensor interfaces where robust input protection is necessary.
- Systems requiring wide supply range and rail-to-rail output.
- Applications needing precise gain setting with a single external resistor.
Q & A
- What is the gain range of the AD8227?
The AD8227 has a gain range of 5 to 1000, settable with a single external resistor.
- What is the input voltage range of the AD8227?
The input voltage range can go below the negative supply and can handle voltages beyond the supply rails, such as ±35 V with a ±5 V supply.
- What are the power supply options for the AD8227?
The AD8227 can operate on single supplies from 2.2 V to 36 V or dual supplies from ±1.5 V to ±18 V.
- What is the bandwidth of the AD8227 at a gain of 5?
The bandwidth at a gain of 5 is 250 kHz.
- What is the common-mode rejection ratio (CMRR) of the AD8227 at a gain of 5?
The CMRR at a gain of 5 is 100 dB minimum for B Grade models.
- What is the typical supply current of the AD8227?
The typical supply current is 350 μA.
- What are the operating temperature limits of the AD8227?
The AD8227 is fully specified for operation from −40°C to +125°C.
- In what packages is the AD8227 available?
The AD8227 is available in 8-lead SOIC and MSOP packages.
- How does the AD8227 handle input voltages beyond the supply rails?
The AD8227 can handle input voltages beyond the supply rails without damage, for example, ±35 V with a ±5 V supply.
- What is the purpose of the reference terminal on the AD8227?
The reference terminal allows the output voltage to be offset to a precise midsupply level, useful for driving single-supply ADCs.
