EL2227CS 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL2227CS

Dual very low noise amplifier

Elantec -> Intersil 

EL2227C

Dual Very Low Noise Amplifier

Applications Information

Product Description

The EL2227C is a dual voltage feedback operational

amplifier designed especially for DMT ADSL and other

applications requiring very low voltage and current

noise. It also features low distortion while drawing mod-

erately low supply current and is built on Elantec's

proprietary high-speed complementary bipolar process.

The EL2227C use a classical voltage-feedback topology

which allows them to be used in a variety of applications

where current-feedback amplifiers are not appropriate

because of restrictions placed upon the feedback ele-

ment used with the amplifier. The conventional topology

of the EL2227C allows, for example, a capacitor to be

placed in the feedback path, making it an excellent

choice for applications such as active filters, sample-

and-holds, or integrators.

ADSL CPE Applications

The low noise EL2227C amplifier is specifically

designed for the dual differential receiver amplifier

function with ADSL transceiver hybrids as well as other

low-noise amplifier applications. A typical ADSL CPE

line interface circuit is shown in Figure 1. The EL2227C

is used in receiving DMT down stream signal. With

careful transceiver hybrid design and the EL2227C

1.9nV/√Hz voltage noise and 1.2pA/√Hz current noise

performance, -140dBm/Hz system background noise

performance can be easily achieved.

Driver

Input

+

-

RF

RG

RF

-

+

RF

R

Receive

RIN

-

Out +

+

Receive

Amplifiers

+

R

-

Receive

RF

RIN

Out -

ROUT

Line +

ROUT

ZLINE

Line -

Figure 1. Typical Line Interface Connection

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