LME49724 Datasheet, PDF (15/30 Pages) National Semiconductor (TI) – High Performance, High Fidelity, Fully-Differential Audio Operational Amplifier

LME49724
www.ti.com
SNAS438A – NOVEMBER 2008 – REVISED APRIL 2013
FULLY DIFFERENTIAL OPERATION
The LME49724 performs best in a fully differential configuration. The circuit shown in Figure 50 is the typical fully
differential configuration.
Figure 50. Fully Differential Configuration
The closed-loop gain is shown in Equation 1 below.
A_V = R_F / R_i (V/V)
where
• R_F1 = R_F2
• R_i1 = R_i2
• Using low value resistors will give the lowest noise performance
(1)
SINGLE-ENDED TO DIFFERENTIAL CONVERSION
For many applications, it is required to convert a single-ended signal to a differential signal. The LME49724 can
be used for a high performance, simple single-to-differential converter. Figure 51 shows the typical single-to-
differential converter circuit configuration.
Figure 51. Single-Ended Input to Differential Output
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