# Precision Fully Differential Op Amp Drives High Resolution ADCs at Low Power

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2 design features Once you understand that the differential gain of the circuit is simply set by the resistor ratio R F /R I, and the output common mode is independently set by the voltage on, it is easy to apply the for a variety of signal translations. the instantaneous average of the two outputs (also called the output common mode voltage) is independent of the input voltage, but instead is user-determined by the voltage on the VOCM pin. V V VOUTCM V OUT = OUT OCM = (2) 2 IN V OUT Figure 2. Inside the differential op amp is an additional feedback loop and error amplifier, providing common mode feedback (CMFB). If both the average of the two outputs and the difference of the two outputs are known, equations 1 and 2 can be used in as a linear system of two equations and two variables to determine the value of each output. IN CMFB V OUT Figure 2 shows how the s differential output can be governed by Equation 1 while the common mode output is held at. The features an additional feedback loop with a separate error amplifier. Two internal resistors measure the instantaneous average of the two outputs, and feed that into the error amplifier with its other input tied to the pin. The output of the error amplifier is connected to the main amplifier in such a way that it attempts to move each of the op amp outputs higher or lower depending on how the error amplifier is driven. (You can think of it as extra current injected into a mirror driving the main op amp s output stages). When this common mode feedback loop closes to a stable operating point, it ensures that the average of the two outputs is equal to, while the difference between the two outputs is controlled by the differential feedback around the main op amp. HOW DO YOU HOOK IT UP? Once you understand that the differential gain of the circuit is simply set by the resistor ratio R F /R I, and the output common mode is independently set by the voltage on, it is easy to apply the for a variety of signal translations. Figures 3 and 4 show some typical examples. Table 1. key specifications Supply Current 1mA Maximum Offset Voltage 200µV 3dB Bandwidth 34MHz Input Noise Density 3.9nV/ Hz Input Voltage Range Rail-to-Rail Output Voltage Range Rail-to-Rail Supply Voltage 2.8V 5.2 Figure 3. Translating a 0V input signal to 9V PP differential output 0V 619Ω 619Ω 2. V OUT V OUT Figure 4. Translating a ±10V input signal to a 9V PP differential output 10V 10V 806Ω 806Ω V OUT V OUT January 2014 : LT Journal of Analog Innovation 15

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