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OPA356 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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OPA356 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 13 page OPA356, 2356 10 SBOS212A APPLICATIONS INFORMATION The OPAx356 series is a CMOS, high-speed, voltage feed- back, operational amplifier designed for video and other general-purpose applications. It is available as a single or dual op amp. The amplifier features a 200MHz gain bandwidth and 360V/ µs slew rate, but it is unity-gain stable and can be operated as a +1V/V voltage follower. Its input common-mode voltage range includes ground, al- lowing the OPAx356 to be used in virtually any single-supply application up to a supply voltage of +5.5V. PCB LAYOUT Good high-frequency PC board layout techniques should be employed for the OPAx356. Generous use of ground planes, short direct signal traces, and a suitable bypass capacitor located at the V+ pin will assure clean, stable operation. Large areas of copper also provide a means of dissipating heat that is generated within the amplifier in normal opera- tion. Sockets are definitely not recommended for use with any high-speed amplifier. A 10 µF ceramic bypass capacitor is the minimum recom- mended value; adding a 1 µF or larger tantalum capacitor in parallel can be beneficial when driving a low-resistance load. Providing adequate bypass capacitance is essential to achiev- ing very low harmonic and intermodulation distortion. OPERATING VOLTAGE The OPAx356 is specified over a power-supply range of +2.7V to +5.5V ( ±1.35 to ±2.75V). However, the supply voltage may range from +2.5V to +5.5V ( ±1.25V to ±2.75V). Supply voltages higher than 7.5V (absolute maximum) can permanently damage the amplifier. FIGURE 1. Internal ESD Protection. Parameters that vary significantly over supply voltage or temperature are shown in the “Typical Characteristics” sec- tion of this data sheet. OUTPUT DRIVE The OPAx356 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 OPAx356 output. 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 OPAx356 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 graph of “Output Voltage Swing vs Output Current”, shown in the “Typical Character- istics” section of this data sheet. INPUT AND ESD PROTECTION All OPAx356 pins are static protected with internal ESD protection diodes tied to the supplies, as shown in Figure 1. These diodes will provide overdrive protection if the current is externally limited to 10mA by the source or by a resistor. External Pin +V CC –V CC Internal Circuitry |
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