10.2 Typical Application

Figure 57 shows the OPA859 configured as a transimpedance amplifier (U1) in a wide-bandwidth, optical front-end system. A second OPA859 configured as a unity-gain buffer (U2) sets a dc offset voltage to the THS4520. The THS4520 is used to convert the single-ended transimpedance output of the OPA859 into a differential output signal. The THS4520 drives the input of the ADS54J64, 14-bit, 1-GSPS analog-to-digital converter (ADC) that digitizes the analog signal.

Figure 57. OPA859 as Both a TIA and a Buffer in an Optical Front-End System