Overview
The AD8221ARMZ-R7, produced by Analog Devices Inc., is a high-performance, gain-programmable instrumentation amplifier. It is renowned for delivering the industry's highest common-mode rejection ratio (CMRR) over frequency in its class. This amplifier is designed to reject wideband interference and line harmonics, simplifying filter requirements. It is particularly suited for applications that demand excellent DC performance, such as precision data acquisition, biomedical analysis, and aerospace instrumentation.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Operating Range | VS | ±2.3 | ±18 | ±18 | V |
| Quiescent Current | T = −40°C to +85°C | 0.9 | 1 | 1.2 | mA |
| Common-Mode Rejection Ratio (CMRR) | DC to 60 Hz, G = 1 | 80 | - | - | dB |
| CMRR at 10 kHz | G = 1 | 80 | - | - | dB |
| Small Signal −3 dB Bandwidth | G = 1 | 825 | - | - | kHz |
| Settling Time (0.01%) | 10 V step, G = 1 to 100 | 10 | - | - | μs |
| Output Swing | VS = ±2.3 V to ±5 V, RL = 10 kΩ | -VS + 1.1 | - | +VS - 1.2 | V |
| Short-Circuit Current | - | 18 | - | - | mA |
| Temperature Range for Specified Performance | - | -40 | - | +85 | °C |
Key Features
- Gain programmable with a single external resistor (gain range 1 to 1000)
- High CMRR over frequency, maintaining a minimum CMRR of 80 dB to 10 kHz at G = 1
- Wide power supply range: ±2.3 V to ±18 V
- Operational over a temperature range of −40°C to +85°C, and up to 125°C
- Available in space-saving 8-lead MSOP and SOIC packages
- Low voltage offset, low offset drift, and low gain drift
- High gain accuracy and excellent AC specifications
- Supports both single and dual supplies
Applications
- Precision data acquisition systems
- Biomedical analysis and medical instrumentation
- Aerospace instrumentation
- Weigh scales and industrial process controls
- Bridge amplifiers and strain gages
- Transducer interfaces
Q & A
- What is the AD8221ARMZ-R7 used for?
The AD8221ARMZ-R7 is a high-performance instrumentation amplifier used in applications requiring high CMRR and precision, such as precision data acquisition, biomedical analysis, and aerospace instrumentation.
- How is the gain of the AD8221ARMZ-R7 set?
The gain of the AD8221ARMZ-R7 is set using a single external resistor across the RG pins, with the gain formula being G = 1 + (49.4 kΩ/RG).
- What is the power supply range of the AD8221ARMZ-R7?
The AD8221ARMZ-R7 operates over a wide power supply range of ±2.3 V to ±18 V.
- What is the temperature range for specified performance of the AD8221ARMZ-R7?
The specified performance temperature range is −40°C to +85°C, and it is operational up to 125°C.
- What are the key features of the AD8221ARMZ-R7's CMRR performance?
The AD8221ARMZ-R7 maintains a minimum CMRR of 80 dB to 10 kHz at G = 1, which is among the highest in its class.
- In what packages is the AD8221ARMZ-R7 available?
The AD8221ARMZ-R7 is available in 8-lead MSOP and SOIC packages.
- What are some typical applications of the AD8221ARMZ-R7?
Typical applications include precision data acquisition, biomedical analysis, aerospace instrumentation, weigh scales, industrial process controls, bridge amplifiers, and transducer interfaces.
- Does the AD8221ARMZ-R7 support both single and dual supplies?
Yes, the AD8221ARMZ-R7 supports both single and dual power supplies.
- What is the settling time of the AD8221ARMZ-R7 for a 10 V step input?
The settling time for a 10 V step input is 10 μs for gains from 1 to 100, and 80 μs for a gain of 1000).
- Is the AD8221ARMZ-R7 suitable for military and aerospace applications?
Yes, the AD8221-EP version, which is similar to the AD8221ARMZ-R7, is specified over the military temperature range of −55°C to +125°C and is well-suited for defense and aerospace applications).
