Overview
The AD8221ARM-REEL7, produced by Analog Devices Inc., is a gain programmable, high-performance instrumentation amplifier. It is renowned for delivering the industry’s highest common-mode rejection ratio (CMRR) over frequency in its class. This amplifier maintains a minimum CMRR of 80 dB up to 10 kHz for all grades at a gain of 1, significantly outperforming other instrumentation amplifiers which typically see CMRR degradation at frequencies above 200 Hz. This high CMRR allows the AD8221 to effectively reject wideband interference and line harmonics, simplifying filter requirements in various applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Common-Mode Rejection Ratio (CMRR) | DC to 60 Hz, G = 1 | 80 | 90 | - | dB |
| CMRR at 10 kHz | G = 1 | 80 | 80 | - | dB |
| Power Supply Operating Range | - | ±2.3 | - | ±18 | V |
| Quiescent Current | T = -40°C to +85°C | 0.9 | 1 | 1.2 | mA |
| Small Signal -3 dB Bandwidth | G = 1 | 825 | - | - | kHz |
| Settling Time (0.01% of 10 V step) | G = 1 to 100 | 10 | - | - | µs |
| Input Bias Current | T = -40°C to +85°C | 0.5 | 2 | 3 | nA |
| Output Swing | VS = ±5 V to ±18 V, RL = 10 kΩ | -VS + 1.2 | - | +VS - 1.4 | V |
Key Features
- High CMRR Over Frequency: Maintains a minimum CMRR of 80 dB up to 10 kHz, ensuring excellent rejection of wideband interference and line harmonics.
- Programmable Gain: Gain can be set from 1 to 1000 using a single external resistor, providing design flexibility.
- Low Voltage Offset and Drift: Features low voltage offset and offset drift, making it suitable for applications requiring high DC performance.
- High Gain Accuracy: Offers high gain accuracy and low gain drift, which is crucial for precise signal conditioning.
- Dual and Single Supply Operation: Can operate on both single and dual power supplies, making it versatile for various application scenarios.
- Wide Operating Temperature Range: Specified performance over a temperature range of -40°C to +85°C, and an operating range up to +125°C.
Applications
- Precision Data Acquisition: Ideal for applications requiring high accuracy and low noise in data acquisition systems.
- Biomedical Analysis: Suitable for biomedical applications due to its high CMRR and low noise characteristics.
- Aerospace Instrumentation: Used in aerospace instrumentation where high precision and reliability are critical.
- Bridge Signal Conditioning: Excellent choice for bridge signal conditioning due to its high gain accuracy and low offset drift.
Q & A
- What is the AD8221ARM-REEL7?
The AD8221ARM-REEL7 is a gain programmable, high-performance instrumentation amplifier produced by Analog Devices Inc.
- What is the CMRR of the AD8221 at 10 kHz?
The AD8221 maintains a minimum CMRR of 80 dB at 10 kHz for a gain of 1.
- How is the gain of the AD8221 set?
The gain of the AD8221 can be set from 1 to 1000 using a single external resistor across the RG pins.
- What is the operating temperature range of the AD8221?
The specified performance temperature range is -40°C to +85°C, with an operating range up to +125°C.
- What are some typical applications of the AD8221?
Typical applications include precision data acquisition, biomedical analysis, aerospace instrumentation, and bridge signal conditioning.
- Can the AD8221 operate on single and dual power supplies?
- What is the small signal -3 dB bandwidth of the AD8221 at a gain of 1?
The small signal -3 dB bandwidth at a gain of 1 is 825 kHz.
- What is the settling time for a 10 V step at a gain of 1 to 100?
The settling time for a 10 V step at a gain of 1 to 100 is 10 µs.
- What is the input bias current of the AD8221?
The input bias current is typically 2 nA over the temperature range of -40°C to +85°C.
- Is the AD8221ARM-REEL7 still in production?
No, the AD8221ARM-REEL7 is obsolete and no longer manufactured.
