Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
The TLV27x family offers outstanding DC and AC performance. These devices operate up to a 16-V power supply and offer ultra-low input bias current and 3-MHz bandwidth. These features make the TLV27x a robust operational amplifier for battery-powered and industrial applications.
This circuit produces a signal inversion. For this circuit, the gain at DC and the low-pass cutoff frequency are calculated by Equation 3:
Software tools are readily available to simplify filter design. WEBENCH® Filter Designer is a simple, powerful, and easy-to-use active filter design program. The WEBENCH® Filter Designer lets you create optimized filter designs using a selection of TI operational amplifiers and passive components from TI's vendor partners.
Available as a web-based tool from the WEBENCH Design Center, WEBENCH Filter Designer allows you to design, optimize, and simulate complete multistage active filter solutions within minutes.
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required. The simplest way to accomplish this limiting is to place an RC filter at the noninverting terminal of the amplifier (see Figure 29 and Equation 4).
If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter, shown in Figure 30, can be used for this task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth; refer to Equation 5. Failure to use an amplifier with this characteristic can result in phase shift of the amplifier.