Overview
The AD22057R, produced by Analog Devices Inc., is a single-supply difference amplifier designed for amplifying and low-pass filtering small differential voltages. This amplifier is particularly useful in applications where the signal source has a large common-mode voltage. The AD22057R features a precision balanced attenuator, a very low drift preamplifier, and an output buffer amplifier, enabling accurate amplification and filtering of differential signals without the need for additional active components.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | +3.0 V to +36 V | V |
| Operating Temperature Range | -40°C to +125°C | °C |
| Input Common-Mode Range | Below ground to 6× (VS – 1 V) | V |
| Gain Range | ×1 to ×160 (adjustable) | |
| Common-Mode Rejection Ratio (CMRR) | At least 80 dB (10,000:1) | dB |
| Differential Input Resistance | 400 kΩ | Ω |
| Output Span | 20 mV to (VS – 0.2) V | V |
| Load Drive Capability | 1 kΩ load to +4 V using VS = +5 V | |
| Peak Input Voltage (40 ms) | 60 V | V |
| Reversed Supply Protection | -34 V | V |
Key Features
- Single-supply operation with a wide supply voltage range (+3.0 V to +36 V).
- High common-mode rejection ratio (CMRR) of at least 80 dB (10,000:1).
- Adjustable gain from ×1 to ×160, with a default gain of ×20.
- Low-pass filtering capabilities with 1-, 2-, or 3-pole filters.
- Transient spike protection and RFI filters included.
- Ability to drive capacitive loads up to 25 pF without external components when operating at lower supply voltages.
- Accurate midscale offset capability.
Applications
- Current sensing in motor control and other low-level signal sources.
- Interface for pressure transducers, position indicators, strain gages, and accelerometers.
- General use in amplifying and filtering small differential voltages in the presence of large common-mode voltages.
Q & A
- What is the primary function of the AD22057R?
The AD22057R is a single-supply difference amplifier designed to amplify and low-pass filter small differential voltages in the presence of large common-mode voltages.
- What is the supply voltage range for the AD22057R?
The supply voltage range for the AD22057R is from +3.0 V to +36 V.
- What is the common-mode rejection ratio (CMRR) of the AD22057R?
The CMRR of the AD22057R is at least 80 dB (10,000:1).
- Can the gain of the AD22057R be adjusted?
- What types of filtering are available with the AD22057R?
- What is the maximum load drive capability of the AD22057R?
- Does the AD22057R have built-in protection features?
- What is the operating temperature range of the AD22057R?
- Can the AD22057R drive capacitive loads without external components?
- Is the AD22057R still in production?
