APPLICATION INFORMATION

PCB Layout

Operating Voltage

Output Drive

OPA356-Q1

The OPA356 is a CMOS high-speed voltage-feedback operational amplifier designed for video and other

general-purpose applications.

The amplifier features a 200-MHz gain bandwidth and 360-V/

µs slew rate, but it is unity-gain stable and can be

operated as a 1-V/V voltage follower.

Its input common-mode voltage range includes ground, allowing the OPA356 to be used in virtually any

single-supply application up to a supply voltage of 5.5 V.

Good high-frequency PC board layout techniques should be employed for the OPA356. Generous use of ground

planes, short direct signal traces, and a suitable bypass capacitor located at the V+ pin assure clean, stable

operation. Large areas of copper also provide a means of dissipating heat that is generated within the amplifier in

normal operation.

Sockets are definitely not recommended for use with any high-speed amplifier.

A 10-

µF ceramic bypass capacitor is the minimum recommended 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 achieving very low harmonic and intermodulation distortion.

The OPA356 is specified over a power-supply range of 2.7 V to 5.5 V (±1.35 V to ±2.75 V). However, the supply

voltage may range from 2.5 V to 5.5 V (±1.25 V to ±2.75 V). Supply voltages higher than 7.5 V (absolute

maximum) can permanently damage the amplifier.

Parameters that vary significantly over supply voltage or temperature are shown in the Typical Characteristics

section of this data sheet.

The OPA356 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 appear as capacitance; it presents only a 150-Ω resistive load to the OPA356 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 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 ±60 mA. See the

"Output Voltage Swing vs Output Current" graph in the Typical Characteristics section

of this data sheet.

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