OPA355NASLASH3K datasheet(10/27 Pages) TI1

10 / 27 page

OPA355, 2355, 3355

SBOS195D

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

100M

100k

–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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