ZHCS019J January 2011 – March 2021 OPA2836 , OPA836
PRODUCTION DATA
The noninverting circuit of Figure 8-1 has minimum gain of 1. To implement attenuation, a resistor divider can be placed in series with the positive input, and the amplifier set for gain of 1 by shorting VOUT to VIN– and removing RG. Because the operational amplifier input is high impedance, the resistor divider sets the attenuation.
The inverting circuit of Figure 8-2 can be 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 = 1 kΩ and RG = 10 kΩ.