+15V

Digital

Output

-15V

V

OCM

V

COM

V

IN+

V

IN-

V

IN-

V

IN+

OPA1632

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SBOS286C – DECEMBER 2003 – REVISED OCTOBER 2015

7 Detailed Description

7.1 Overview

7.1.1 Fully-Differential Amplifiers

The OPA1632 is a fully differential amplifier. Differential signal processing offers a number of performance

advantages in high-speed analog signal processing systems, including immunity to external common-mode

noise, suppression of even-order nonlinearities, and increased dynamic range. Fully-differential amplifiers not

only serve as the primary means of providing gain to a differential signal chain, but also provide a monolithic

solution for converting single-ended signals into differential signals allowing for easy, high-performance

processing.

A standard configuration for the device is shown in Figure 11. The functionality of a fully differential amplifier can

be imagined as two inverting amplifiers that share a common noninverting terminal (though the voltage is not

necessarily fixed). For more information on the basic theory of operation for fully differential amplifiers, refer to

the Texas Instruments Fully Differential Amplifiers application note (SLOA054), available for download from the

TI web site (www.ti.com).

Figure 11. Typical ADC Circuit

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