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OPA355 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA355 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 27 page  OPA355, 2355, 3355 SBOS195D 10 www.ti.com APPLICATIONS INFORMATION The OPA355 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, dual, or triple 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 OPA355 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 OPA355. 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 10nF ceramic bypass capacitor is the minimum recom- mended value; adding a 1 µF or larger tantalum capacitor in TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, G = +2, RF = 604Ω, and RL = 150Ω connected to VS/2, unless otherwise noted. CHANNEL-TO-CHANNEL CROSSTALK Frequency (Hz) 10M 1M 100M 100k 0 –20 –40 –60 –80 –100 –120 OPA3355 (triple) OPA2355 (dual) 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 OPA355 is specified over a power-supply range of +2.7V to +5.5V ( ±1.35V 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 perma- nently damage the amplifier. Parameters that vary significantly over supply voltage or temperature are shown in the Typical Characteristics section of this data sheet. ENABLE FUNCTION The OPA355 can be enabled by applying a TTL HIGH voltage level to the Enable pin. Conversely, a TTL LOW voltage level will disable the amplifier, reducing its supply current from 8.3mA to only 3.4 µA per amplifier. This pin voltage is referenced to single-supply ground. When using a split-supply, such as ±2.5V, the enable/disable voltage levels will be referenced to V–. Independent Enable pins are available for each channel, providing maximum design flex- ibility. For portable battery-operated applications, this feature can be used to greatly reduce the average current and thereby extend battery life. |
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