Overview
The AD8220ARMZ-RL, produced by Analog Devices Inc., is a single-supply, JFET input instrumentation amplifier designed for high-performance, portable instrumentation applications. It is the first such amplifier available in an MSOP package, which significantly reduces board area compared to traditional SOIC packages. This amplifier is optimized for low power consumption and excellent ac specifications, making it ideal for battery-powered devices and applications requiring minimal power supplies.
The AD8220 can operate on a single supply from 4.5 V to 36 V or on a dual supply from ±2.25 V to ±18 V, and it features a rail-to-rail output stage that maximizes dynamic range on low voltage supplies. The device is highly versatile, with gain adjustable from 1 to 1000 using a single resistor, and it includes a reference pin for offsetting the output voltage, which is particularly useful when interfacing with analog-to-digital converters.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Common-Mode Rejection Ratio (CMRR) | 86 dB (dc), 80 dB (5 kHz, G = 1) | dB | ||
| Input Bias Current | 10 pA | 300 pA | pA | |
| Input Offset Current | 0.6 pA | 2 pA | pA | |
| Bandwidth (G = 1) | 1.5 MHz | MHz | ||
| Input Noise (1 kHz) | 14 nV/√Hz | nV/√Hz | ||
| Slew Rate (G = 1 to 100) | 2 V/μs | V/μs | ||
| Quiescent Supply Current | 750 μA | 850 μA | μA | |
| Operating Temperature Range | −40°C | +85°C | °C | |
| Supply Voltage Range | 4.5 V | 36 V (single supply), ±2.25 V to ±18 V (dual supply) | V | |
| ESD Protection | 4 kV | kV |
Key Features
- High CMRR: Minimum CMRR of 86 dB at dc and 80 dB at 5 kHz for G = 1.
- Low Input Currents: Maximum input bias current of 10 pA and input offset current of 0.6 pA.
- Excellent AC Specifications: 1.5 MHz bandwidth (G = 1) and 14 nV/√Hz input noise at 1 kHz.
- Low Power Consumption: Maximum quiescent supply current of 750 μA.
- Versatile Supply Options: Operates on a single supply from 4.5 V to 36 V or on a dual supply from ±2.25 V to ±18 V.
- Rail-to-Rail Output: Maximizes dynamic range on low voltage supplies.
- Gain Adjustability: Gain settable from 1 to 1000 with a single resistor.
- Reference Pin for Output Offset: Useful for interfacing with analog-to-digital converters.
- Compact MSOP Package: Takes roughly half the board area of an SOIC package.
- 4 kV ESD Protection: Enhances robustness against electrostatic discharge.
Applications
- Medical Instrumentation: Suitable for precise medical measurements.
- Precision Data Acquisition: Ideal for high-accuracy data acquisition systems.
- Transducer Interfaces: Used for interfacing with various transducers in industrial and medical applications.
- Defense and Aerospace: The AD8220-EP version supports defense and aerospace applications with enhanced reliability and controlled manufacturing baseline.
- Automotive Applications: The W grade is specified over the automotive temperature range of −40°C to +125°C.
Q & A
- What is the typical input bias current of the AD8220?
The typical input bias current of the AD8220 is 10 pA and typically remains below 300 pA over the entire industrial temperature range.
- What is the bandwidth of the AD8220 at a gain of 1?
The bandwidth of the AD8220 at a gain of 1 is 1.5 MHz.
- What is the slew rate of the AD8220?
The slew rate of the AD8220 is 2 V/μs.
- What are the supply voltage options for the AD8220?
The AD8220 can operate on a single supply from 4.5 V to 36 V or on a dual supply from ±2.25 V to ±18 V.
- How is the gain of the AD8220 adjusted?
The gain of the AD8220 is adjusted using a single resistor, with gain settings ranging from 1 to 1000.
- What is the maximum quiescent supply current of the AD8220?
The maximum quiescent supply current of the AD8220 is 750 μA.
- What is the operating temperature range for the AD8220?
The operating temperature range for the AD8220 is −40°C to +85°C for the A and B grades, and −40°C to +125°C for the W grade.
- Does the AD8220 have ESD protection?
Yes, the AD8220 has 4 kV ESD protection.
- What are some common applications of the AD8220?
The AD8220 is commonly used in medical instrumentation, precision data acquisition, transducer interfaces, and automotive applications.
- Is the AD8220 suitable for battery-powered devices?
Yes, the AD8220 is suitable for battery-powered devices due to its low power consumption and ability to operate on a single 5 V supply.
