Overview
The AD22050, produced by Analog Devices Inc., is a single-supply difference amplifier designed for amplifying and low-pass filtering small differential voltages. It is particularly useful for applications where the input signal has a large common-mode voltage. The amplifier operates with supply voltages ranging from +3.0 V to +36 V and features a high common-mode rejection ratio (CMRR) of at least 80 dB. This makes it suitable for various sensor interface applications, including those involving strain gages and current sensing shunt resistors.
Key Specifications
| Specification | Value |
|---|---|
| Supply Voltage | +3.0 V to +36 V |
| Peak Input Voltage (40 ms) | +60 V |
| Reversed Supply Voltage Protection | -34 V |
| Operating Temperature Range | -40°C to +125°C |
| Input Common-Mode Range | Below ground to 6× (VS - 1 V) |
| Differential Input Resistance | 400 kΩ |
| Gain | ×20 (alterable from ×1 to ×160) |
| Output Span | 20 mV to (VS - 0.2) V |
| Low-Pass Filtering | 1-, 2-, 3-pole available |
Key Features
- High gain, single-supply difference amplifier with a gain of ×20 (configurable from ×1 to ×160)
- Excellent common-mode rejection ratio (CMRR) of at least 80 dB
- Input common-mode range extends from below ground to 6× (VS - 1 V)
- Provisions for optional low-pass filtering (1-, 2-, 3-pole)
- Accurate midscale offset capability for bipolar signal amplification
- Transient spike protection and RFI filters included
- Drives 1 kΩ load to +4 V using VS = +5 V
Applications
The AD22050 is suitable for various applications where high gain, single-supply difference amplification is required, particularly in scenarios involving large common-mode voltages. Key applications include:
- Strain gage interfaces
- Current sensing with shunt resistors
- Sensor interface applications in industrial, instrumentation, and medical devices
- Any application requiring precise amplification of small differential voltages with high common-mode rejection
Q & A
- What is the supply voltage range for the AD22050?
The AD22050 operates with supply voltages ranging from +3.0 V to +36 V.
- What is the peak input voltage the AD22050 can handle?
The AD22050 can handle a peak input voltage of +60 V for 40 ms.
- What is the common-mode rejection ratio (CMRR) of the AD22050?
The CMRR of the AD22050 is at least 80 dB.
- How can the gain of the AD22050 be adjusted?
The gain of the AD22050 is configurable from ×1 to ×160.
- What types of low-pass filtering are available on the AD22050?
The AD22050 offers 1-, 2-, and 3-pole low-pass filtering options.
- What is the operating temperature range of the AD22050?
The operating temperature range of the AD22050 is -40°C to +125°C.
- Does the AD22050 have built-in protection against transient spikes and RFI?
- What is the differential input resistance of the AD22050?
The differential input resistance of the AD22050 is 400 kΩ.
- Can the AD22050 drive a 1 kΩ load?
- Is the AD22050 RoHS compliant?
