Catalog
Single Supply Sensor Interface Amplifier
Key Features
• Gain of ×20 Alterable from ×1 to ×160
• Input CMR from Below Ground to 6× (VS- 1 V)
• Output Span 20 mV to (VS- 0.2) V
• 1-, 2-, 3-Pole Low-Pass Filtering Available
• Accurate Midscale Offset Capability
• Differential Input Resistance 400 kΩ
• Drives 1kΩ Load to +4 V Using VS= +5 V
• Supply Voltage: +3.0 V to +36 V
• Transient Spike Protection and RFIFilters Included
• Peak Input Voltage (40 ms): 60 V
• Reversed Supply Protection: -34 V
• Operating Temperature Range: -40°Cto +125°C
Description
AI
The AD22057 is a single-supply difference amplifier for the amplification and low-pass filtering of small differential voltages from sources having a large common-mode voltage.Supply voltages from +3 V to +36 V can be used. The input common-mode range extends from below ground to 24 V using a +5 V supply with excellent rejection of this common-mode voltage.This range is achieved by the use of a special resitive attenuator at the input, laser trimmed to a very high differential balance. Low initial offset voltage and offset voltage drift are specified, and long-term stability of gain and offset voltage is also provided.Provisions are included for optional low-pass filtering and gain adjustment. An accurate midscale offset feature allows bipolar signals to be amplified.
