Datasheet > EL2141CS-T13

EL2141CS-T13

更新时间： 2024-02-22 22:24:33

品牌	Logo	应用领域
英特矽尔 - INTERSIL		驱动器接口集成电路光电二极管
页数	文件大小	规格书
6页	270K
描述
150MHz Differential Twisted Pair Driver

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EL2141CS-T13 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	MS-012, SOIC-8
针数：	8	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.36	Is Samacsys：	N
差分输出：	YES	驱动器位数：	1
输入特性：	DIFFERENTIAL	接口集成电路类型：	LINE DRIVER
接口标准：	GENERAL PURPOSE	JESD-30 代码：	R-PDSO-G8
标称负供电电压：	-5 V	功能数量：	1
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	认证状态：	Not Qualified
最大供电电压：	6.3 V	最小供电电压：	3 V
标称供电电压：	5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子位置：	DUAL	Base Number Matches：	1

EL2141CS-T13 数据手册

EL2141

Typical Performance Curves (Continued)

FIGURE 5. DISTORTION vs FREQUENCY

FIGURE 6. OUTPUT SIGNAL AND COMMON MODE SIGNAL

vs FREQUENCY

(GAIN = 6, R

= 200Ω) V = 2V

LOAD

PK-PK

The amount of capacitance tolerated on any of these nodes

in an actual application will also be dependent on the gain

setting and the resistor values in the feedback network.

Applications Information

Distortion Considerations

The harmonics that these amplifiers will potentially produce

are the 2nd, 3rd, 5th, and 6th. Their amplitude is application

dependent. All other harmonics should be negligible by com-

parison. Each should be considered separately:

H2 The second harmonic arises from the input stage, and

the lower the applied differential signal amplitude, the lower

the magnitude of the second harmonic. For practical consid-

erations of required output signal and input noise levels, the

user will end up choosing a circuit gain. Referring to Figure 1,

it is best if the voltage at the negative feedback node tracks

the V

node, and the voltage at the positive feedback

R1 + R2 + R3

GAIN = ------------------------------------

REF

node tracks the V node respectively. This would theoreti-

cally require that R1 + R2 = R3, although the lowest

distortion is found at about R3 = R1 + (0.7*R2). With this

arrangement, the second harmonic should be suppressed

well below the value of the third harmonic.

Choice of Feedback Resistor

There is little to be gained from choosing resistor R2 values

below 400Ω and, in fact, it would only result in increased

power dissipation and signal distortion. Above 400Ω, the

bandwidth response will develop some peaking (for a gain of

two), but substantially higher resistor R2 values may be used

for higher voltage gains, such as up to 2kΩ at a gain of eight

before peaking will develop. R1 and R3 are selected as

needed to set the voltage gain, and while R1 = R3 is sug-

gested, the gain equation above holds for any values (see

distortion for further suggestions).

H3 The third harmonic should be the dominant harmonic and

is primarily affected by output load current which, of course,

is unavoidable. However, this should encourage the user not

to waste current in the gain setting resistors, and to use val-

ues that consume only a small proportion of the load current,

so long as peaking does not occur. The more load current,

the worse the distortion, but depending on the frequency, it

may be possible to reduce the amplifier gain so that there is

more internal gain left to cancel out any distortion.

Capacitance Considerations

H5 The fifth harmonic should always be below the third, and

will not become significant until heavy load currents are

drawn. Generally, it should respond to the same efforts

applied to reducing the third harmonic.

As with many high bandwidth amplifiers, the EL2141 prefers

not to drive highly capacitive loads. It is best if the capaci-

tance on V

and V

is kept below 10pF if the user

OUT

OUTB

does not want gain peaking to develop.

H6 The sixth harmonic should not be a problem and is the

result of poor power supply decoupling. While 100nF chip

capacitors may be sufficient for some applications, it would

be insufficient for driving full signal swings into a twisted pair

line at 100kHz. Under these conditions, the addition of 4.7µF

tantalum capacitors would cure the problem.

In addition, on the EL2141, the two feedback nodes FBP and

FBN should be laid out so as to minimize stray capacitance,

else an additional pole will potentially develop in the

response with possible gain peaking.

FN7048.1

February 11, 2005

1 2 345 6

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