7.3.2 Output Drive

The output stage of the OPA356-Q1 is capable of driving a standard back-terminated 75-Ω video cable. A back-terminated transmission line does not exhibit a capacitive load to its driver. A properly back-terminated 75-Ω cable does not appear as capacitance; the cable presents only a 150-Ω resistive load to the OPA356-Q1 output.

The output stage can supply high short-circuit current (typically over 200 mA). Therefore, an on-chip thermal shutdown circuit is provided to protect the OPA356-Q1 from dangerously high junction temperatures. At 160°C, the protection circuit shuts down the amplifier. Normal operation resumes when the junction temperature cools to below 140°C.