Active Filter Board, OPA172, AD Anti-Aliasing, DA Reconstruction

Description

710-0013-01
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Active Filter Board, OPA172, AD Anti-Aliasing, DA Reconstruction
Applications for the Active Filter Board include being used as an anti-aliasing filter for A/D conversion or as a reconstruction filter after D/A conversion.
The Active Filter Board is configured as a two-pole active filter followed by a third passive pole if desired. The op-amp circuitry forms the two-pole filter while the RC network at the output of the operational amplifier forms the third passive pole.
The operational amplifier used for this board is the Texas Instruments OPA172 whose main features make it suitable for experimenting.
These features are:
Wide Supply Range: +4.5V to +36V, ±2.25V to ±18V
Low Offset Voltage: ±0.2mV
Gain Bandwidth: 10 MHz
Input Range Includes the Negative Supply
Input Range Operates to Positive Supply
Rail-to-Rail Output
Low Noise: 7nV/√Hz
High Common-Mode Rejection: 120 dB
Low Input Bias Current: ±8pA
Low Quiescent Current: 1.6mA per Amplifier
For your convenience, the board comes bundled with some components that you can put into the sockets — two 15KΩ resistors, a 3KΩ resistor, a 750Ω resistor, a 10KΩ resistor, a 0.1µF capacitor, a 0.033µF capacitor, and a 0.01µF capacitor. See the User Manual and Bill of Materials for typical socket placement. Between the sockets are solder pads in case you want to install SMD components instead.
The User Manual shows you which component values to place where to create Butterworth, Bessel, and 3-dB Chebyshev type low-pass filters, as well as how to calculate new corner frequency values. Using that information, it is easy to make active anti-aliasing and reconstruction filters.
Male headers provide access to the power pins.
The Active Filter Board can be operated with single or dual power supplies, and the 10MHz bandwidth makes it sufficient for most experimental circuits.