ZHCS020J January 2011 – March 2021 OPA2835 , OPA835
PRODUCTION DATA
The noninverting circuit shown in Figure 8-1 has a minimum gain of 1. To implement attenuation, a resistor divider can be placed in series with the positive input, and the amplifier set for a gain of 1 by shorting VOUT to VIN– and removing RG. Because the op amp input is high impedance, the resistor divider sets the attenuation.
The inverting circuit of Figure 8-2 is used as an attenuator by making RG larger than RF. The attenuation is the resistor ratio. For example, a 10:1 attenuator can be implemented with RF = 2 kΩ and RG = 20 kΩ.