EL5444C 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL5444C

100 MHz Single Supply Rail to Rail Amplifier

Elantec -> Intersil 

EL5144C, EL5146C, EL5244C, EL5246C,

EL5444C

100 MHz Single Supply Rail to Rail Amplifier

Description of Operation and Applications Information

Product Description

The EL5144C series is a family of wide bandwidth, sin-

gle supply, low power, rail-to-rail output, voltage

feedback operational amplifiers. The family includes

single, dual, and quad configurations. The singles and

duals are available with a power down pin to reduce

power to 2.6µA typically. All the amplifiers are inter-

nally compensated for closed loop feedback gains of +1

or greater. Larger gains are acceptable but bandwidth

will be reduced according to the familiar Gain-Band-

width Product.

Connected in voltage follower mode and driving a high

impedance load, the EL5144C series has a -3dB band-

width of 100 MHz. Driving a 150Ω load, they have a

-3dB bandwidth of 60 MHz while maintaining a 200

V/µS slew rate. The input common mode voltage range

includes ground while the output can swing rail to rail.

Power Supply Bypassing and Printed Circuit

Board Layout

As with any high-frequency device, good printed circuit

board layout is necessary for optimum performance.

Ground plane construction is highly recommended.

Lead lengths should be as short as possible. The power

supply pin must be well bypassed to reduce the risk of

oscillation For normal single supply operation, where

the GND pin is connected to the ground plane, a single

4.7 µF tantalum capacitor in parallel with a 0.1 µF

ceramic capacitor from VS to GND will suffice. This

same capacitor combination should be placed at each

supply pin to ground if split supplies are to be used. In

this case, the GND pin becomes the negative supply rail.

For good AC performance, parasitic capacitance should

be kept to a minimum. Use of wire wound resistors

should be avoided because of their additional series

inductance. Use of sockets, particularly for the SO pack-

age, should be avoided if possible. Sockets add parasitic

inductance and capacitance that can result in compro-

mised performance.

Input, Output, and Supply Voltage Range

The EL5144C series has been designed to operate with a

single supply voltage of 5V. Split supplies can be used

so long as their total range is 5V.

The amplifiers have an input common mode voltage

range that includes the negative supply (GND pin) and

extends to within 1.5V of the positive supply (VS pin).

They are specified over this range.

The output of the EL5144C series amplifiers can swing

rail to rail. As the load resistance becomes lower in

value, the ability to drive close to each rail is reduced.

However, even with an effective 150 Ω load resistor

connected to a voltage halfway between the supply rails,

the output will swing to within 150mV of either rail.

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