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OPA355UAG4 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA355UAG4 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 26 page  OPA355, 2355, 3355 SBOS195D 11 www.ti.com The Enable input can be modeled as a CMOS input gate with a 100k Ω pull-up resistor to V+. Left open, the Enable pin will assume a logic HIGH, and the amplifier will be on. The Enable time is 100ns and the disable time is only 30ns. This allows the OPA355 to be operated as a “gated” amplifier, or to have its output multiplexed onto a common output bus. When disabled, the output assumes a high-impedance state. OUTPUT DRIVE The output stage can supply high short-circuit current (typi- cally over 200mA). Therefore, an on-chip thermal shutdown circuit is provided to protect the OPA355 from dangerously high junction temperatures. At 160 °C, the protection circuit will shut down the amplifier. Normal operation will resume when the junction temperature cools to below 140 °C. NOTE: it is not recommended to run a continuous DC current in excess of ±60mA. Refer to the Typical Characteristics, Output Voltage Swing vs Output Current. VIDEO The OPA355 output stage is capable of driving a standard back-terminated 75 Ω video cable. By back-terminating a transmission line, it does not exhibit a capacitive load to its driver. A properly back-terminated 75 Ω cable does not ap- pear as capacitance; it presents only a 150 Ω resistive load to the OPA355 output. The OPA355 can be used as an amplifier for RGB graphic signals, which have a voltage of zero at the video black level, by offsetting and AC-coupling the signal, as shown in Figure 1. WIDEBAND VIDEO MULTIPLEXING One common application for video speed amplifiers which include an enable pin is to wire multiple amplifier outputs together, then select which one of several possible video inputs to source onto a single line. This simple Wired-OR Video Multiplexer can be easily implemented using the OPA357; see Figure 2. INPUT AND ESD PROTECTION All OPA355 pins are static protected with internal ESD protection diodes tied to the supplies; see Figure 3. These diodes will provide overdrive protection if the current is externally limited to 10mA by the source or by a resistor. FIGURE 1. RGB Cable Driver. 1/3 OPA355 604 Ω 1 µF 10nF +3V 75 Ω Red Green Blue 604 Ω R 2 R 1 Red(1) V+ R 2 R 1 Green(1) V+ R 2 R 1 Blue(1) V+ 75 Ω 220 µF 604 Ω 75 Ω 75 Ω 1/3 OPA355 1/3 OPA355 604 Ω 75 Ω 604 Ω 604 Ω 75 Ω + NOTE: (1) Source video signal offset 300mV above ground to accommodate op amp swing-to-ground capability. 220 µF 220 µF |
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