Single Output Buffer Circuit Analysis: Low Voltage Operation and 50Ω Output Impedance

The circuit illustrated in Figure 16 represents a single output buffer. Each buffer is powered by OVDD and OGND, which are independent of the ADC's power and ground. The inclusion of an additional N-channel transistor within the output driver permits operation at low voltage levels. The incorporation of an internal resistor in series with the output leads to the output presenting a 50Ω impedance to external circuitry, potentially eliminating the need for external damping resistors.