Datasheet > EL2257CS-T7

EL2257CS-T7

更新时间： 2024-02-29 14:52:41

品牌	Logo	应用领域
英特矽尔 - INTERSIL		运算放大器光电二极管局域网
页数	文件大小	规格书
17页	645K
描述
125MHz Single Supply, Clamping Op Amp

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EL2257CS-T7 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：	SOP,
针数：	14	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.84	Is Samacsys：	N
放大器类型：	OPERATIONAL AMPLIFIER	JESD-30 代码：	R-PDSO-G14
长度：	8.65 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	14
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	240	认证状态：	Not Qualified
座面最大高度：	1.75 mm	子类别：	Operational Amplifier
表面贴装：	YES	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.9 mm	Base Number Matches：	1

EL2257CS-T7 数据手册

EL2257

voltage higher than +1.5V at the inputs will be clamped and

+3V will be seen at the output. Each amplifier of the EL2257

have their own CLAMP pin, so individual clamp levels may

be set.

Figure 1 below is the EL2257 with each amplifier unity gain

connected. Amplifier A is being driven by a 3V

sinewave

P-P

and has 2.25V applied to CLAMPA, while amplifier B is

driven by a 3V triangle wave and 1.5V is applied to

P-P

CLAMPB. The resulting output waveforms, with their outputs

being clamped is shown in Figure 2.

FIGURE 3.

The clamp accuracy is affected by 1) the CLAMP pin voltage,

2) the input voltage, and 3) the load resistor. Depending

upon the application, the accuracy may be as little as a few

tens of millivolts up to a few hundred millivolts. Be sure to

allow for these inaccuracies when choosing the clamp

voltage. Curves of Clamp Accuracy vs. V

and V for

CLAMP

3 values of R are included in the Typical Performance

Curves section.

Unlike amplifiers that clamp at the input and are therefore

limited to non-inverting applications only, the EL2257 output

clamp architecture works for both inverting and non-inverting

gain applications. There is also no maximum voltage

FIGURE 1.

difference limitation between V and V

which is

CLAMP

common on input clamped architectures.

The voltage clamp operates for any voltage between +1.2V

above the GND pin, and the minimum output voltage swing,

. Forcing the CLAMP pin much below +1.2V can saturate

transistors and should therefore be avoided. Forcing the

CLAMP pin above V simply de-activates the CLAMP

feature. In other words, one cannot expect to clamp any

voltage higher than what the EL2257 can drive to in the first

place. If the clamp feature is not desired, either let the

CLAMP pin float or connect it to the V + pin.

EL2257 Comparator Application

The EL2257 can be used as a very fast, single supply

comparator by utilizing the clamp feature. Most op amps

used as comparators allow only slow speed operation

because of output saturation issues. However, by applying a

DC voltage to the CLAMP pin of the EL2257, the maximum

output voltage can be clamped, thus preventing saturation.

Figure 4 is amplifier A of an EL2257 implemented as a

comparator. 2.25V DC is applied to the CLAMP pin, as well

FIGURE 2.

Figure 3 shows the output of amplifier A of the same circuit

being driven by a 0.5V to 2.75V square wave as the clamp

voltage is varied from 1.0V to 2.5V, as well as the unclamped

output signal. The rising edge of the signal is clamped to the

voltage applied to the CLAMP pin almost instantaneously.

The output recovers from the clamped mode within 5–7ns,

depending on the clamp voltage. Even when the CLAMP pin

is taken 0.2V below the minimum 1.2V specified, the output

is still clamped and recovers in about 11ns.

as the I - pin. A differential signal is then applied between

the inputs. Figure 5 shows the output square wave that

results when a ±1V, 10MHz triangular wave is applied, while

Figure 6 is a graph of propagation delay vs. overdrive as a

square wave is presented at the input.

1...10 11 121314 15 16 17

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