Datasheet > OPA621KU

OPA621KU

更新时间： 2024-01-17 12:47:26

品牌	Logo	应用领域
BB		运算放大器
页数	文件大小	规格书
16页	195K
描述
Wideband Precision OPERATIONAL AMPLIFIER

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技术参数
数据手册
替代型号

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OPA621KU 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP8,.3	Reach Compliance Code：	unknown
风险等级：	5.58	放大器类型：	OPERATIONAL AMPLIFIER
架构：	VOLTAGE-FEEDBACK	最大平均偏置电流 (IIB)：	40 µA
25C 时的最大偏置电流 (IIB)：	30 µA	标称共模抑制比：	75 dB
频率补偿：	YES (AVCL>=2)	最大输入失调电压：	1000 µV
JESD-30 代码：	R-CDIP-T8	JESD-609代码：	e0
低-失调：	NO	标称负供电电压 (Vsup)：	-5 V
功能数量：	1	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	CERAMIC, METAL-SEALED COFIRED	封装代码：	DIP
封装等效代码：	DIP8,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	+-5 V	认证状态：	Not Qualified
最小摆率：	350 V/us	标称压摆率：	500 V/us
子类别：	Operational Amplifier	最大压摆率：	30 mA
供电电压上限：	7 V	标称供电电压 (Vsup)：	5 V
表面贴装：	NO	技术：	BIPOLAR
温度等级：	MILITARY	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
标称均一增益带宽：	500000 kHz	最小电压增益：	160
Base Number Matches：	1

OPA621KU 数据手册

COMPENSATION

error band of ±200µV centered around the final value of 2V.

The OPA621 is stable in inverting gains of ≥–2V/V and in

non-inverting gains ≥+2V/V. Phase margin for both con-

figurations is approximately 50°. Inverting and non-invert-

ing gains of unity should be avoided. The minimum stable

gains of +2V/V and –2V/V are the most demanding circuit

configurations for loop stability and oscillations are most

likely to occur in these gains. If possible, use the device in

a noise gain greater than three to improve phase margin and

reduce the susceptibility to oscillation. (Note that, from a

stability standpoint, an inverting gain of –2V/V is equivalent

to a noise gain of 3.) Gain and phase response for other gains

are shown in the Typical Performance Curves.

Settling time, specified in an inverting gain of two, occurs in

only 25ns to 0.01% for a 2V step, making the OPA621 one

of the fastest settling monolithic amplifiers commercially

available. Settling time increases with closed-loop gain and

output voltage change as described in the Typical Perform-

ance Curves. Preserving settling time requires critical

attention to the details as mentioned under “Wiring Precau-

tions.” The amplifier also recovers quickly from input

overloads. Overload recovery time to linear operation from

a 50% overload is typically only 30ns.

In practice, settling time measurements on the OPA621

prove to be very difficult to perform. Accurate measurement

is next to impossible in all but the very best equipped labs.

Among other things, a fast flat-top generator and high speed

oscilloscope are needed. Unfortunately, fast flat-top genera-

tors, which settle to 0.01% in sufficient time, are scarce and

expensive. Fast oscilloscopes, however, are more commonly

available. For best results a sampling oscilloscope is recom-

mended. Sampling scopes typically have bandwidths that

are greater than 1GHz and very low capacitance inputs.

They also exhibit faster settling times in response to signals

that would tend to overload a real-time oscilloscope.

The high-frequency response of the OPA621 in a good

layout is flat with frequency for higher-gain circuits. How-

ever, low-gain circuits and configurations where large

feedback resistances are used, can produce high-frequency

gain peaking. This peaking can be minimized by connecting

a small capacitor in parallel with the feedback resistor. This

capacitor compensates for the closed-loop, high frequency,

transfer function zero that results from the time constant

formed by the input capacitance of the amplifier (typically

2pF after PC board mounting), and the input and feedback

resistors. The selected compensation capacitor may be a

trimmer, a fixed capacitor, or a planned PC board capaci-

tance. The capacitance value is strongly dependent on circuit

layout and closed-loop gain. Using small resistor values will

preserve the phase margin and avoid peaking by keeping the

break frequency of this zero sufficiently high. When high

closed-loop gains are required, a three-resistor attenuator

(tee network) is recommended to avoid using large value

resistors with large time constants.

Figure 7 shows the test circuit used to measure settling time

for the OPA621. This approach uses a 16-bit sampling

oscilloscope to monitor the input and output pulses. These

waveforms are captured by the sampling scope, averaged,

and then subtracted from each other in software to produce

the error signal. This technique eliminates the need for the

traditional “false-summing junction,” which adds extra

parasitic capacitance. Note that instead of an additional flat-

top generator, this technique uses the scope’s built-in cali-

bration source as the input signal.

SETTLING TIME

Settling time is defined as the total time required, from the

input signal step, for the output to settle to within the

specified error band around the final value. This error band

is expressed as a percentage of the value of the output

transition, a 2V step. Thus, settling time to 0.01% requires an

DIFFERENTIAL GAIN AND PHASE

Differential Gain (DG) and Differential Phase (DP) are

among the more important specifications for video applica-

tions. DG is defined as the percent change in closed-loop

gain over a specified change in output voltage level. DP is

1pF to 4pF (Adjust for Optimum Settling)

0 to +2V, f = 1.25MHz

V_IN

100Ω

200Ω

+5VDC

0 to –2V

V_OUT

OPA621

NOTE: Test fixture built using all surface-mount components. Ground

plane used on component side and entire fixture enclosed in metal case.

Both power supplies bypassed with 10µF Tantalum || 0.01µF ceramic

capacitors. It is directly connected (without cable) to TIME CAL trigger

source on Sampling Scope (Data Precision's Data 6100 with Model

640-1 plug-in). Input monitored with Active Probe (Channel 1).

200Ω

To Active Probe (Channel 2)

on sampling scope.

–5VDC

FIGURE 7. Settling Time Test Circuit.

OPA621

1...10 11 121314 15 16

中文翻译

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OPA621KU 替代型号

型号	品牌	替代类型	描述	数据表
OPA651UB	BB	功能相似	Wideband, Low Power Voltage Feedback OPERATIONAL AMPLIFIER

与OPA621KU相关器件

型号	品牌	获取价格	描述	数据表
OPA621KU/2K5	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar, PDSO8, PLASTIC, SOIC-8
OPA621KU-TR	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, PDSO8, SO-8
OPA621MD-B	BB	获取价格	Operational Amplifier, 1 Func, BIPolar,
OPA621SD	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar,
OPA621SG	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar, CDIP8, CERAMIC, DIP-8
OPA621SG/883B	BB	获取价格	Operational Amplifier, 1 Func, BIPolar, CDIP8,
OPA622	BB	获取价格	Wide-Bandwidth OPERATIONAL AMPLIFIER
OPA622AD	BB	获取价格	Operational Amplifier, 1 Func, DIE-13
OPA622AP	BB	获取价格	Wide-Bandwidth OPERATIONAL AMPLIFIER
OPA622AU	BB	获取价格	Wide-Bandwidth OPERATIONAL AMPLIFIER

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