OPA620SG

更新时间： 2024-02-05 19:30:20

品牌	Logo	应用领域
BB		运算放大器放大器电路
页数	文件大小	规格书
15页	311K
描述
Wideband Precision OPERATIONAL AMPLIFIER

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技术参数
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OPA620SG 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	CERAMIC, DIP-8	Reach Compliance Code：	unknown
风险等级：	5.81	Is Samacsys：	N
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
最小共模抑制比：	65 dB	标称共模抑制比：	75 dB
频率补偿：	YES	最大输入失调电压：	1000 µV
JESD-30 代码：	R-CDIP-T8	JESD-609代码：	e0
低-偏置：	NO	低-失调：	NO
微功率：	NO	负供电电压上限：	-7 V
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	功率：	NO
电源：	+-5 V	可编程功率：	NO
认证状态：	Not Qualified	最小摆率：	175 V/us
标称压摆率：	250 V/us	子类别：	Operational Amplifier
最大压摆率：	25 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：	200000 kHz
最小电压增益：	316	宽带：	YES
Base Number Matches：	1

OPA620SG 数据手册

COMPENSATION

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 OPA620 is internally compensated and is stable in unity

gain with a phase margin of approximately 60°. However,

the unity gain buffer is the most demanding circuit configu-

ration for loop stability and oscillations are most likely to

occur in this gain. If possible, use the device in a noise gain

of two or greater to improve phase margin and reduce the

susceptibility to oscillation. (Note that, from a stability

standpoint, an inverting gain of –1V/V is equivalent to a

noise gain of 2.) Gain and phase response for other gains are

shown in the Typical Performance Curves.

Figure 7 shows the test circuit used to measure settling time

for the OPA620. 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 para-

sitic capacitance. Note that instead of an additional flat-top

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

source as the input signal.

The high-frequency response of the OPA620 in a good

layout is very flat with frequency. However, some circuit

configurations such as those where large feedback

resistances are used, can produce high-frequency gain peak-

ing. This peaking can be minimized by connecting a small

capacitor in parallel with the feedback resistor. This capaci-

tor 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 capacitance. The capaci-

tance 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.

2pF to 5pF (Adjust for Optimum Settling)

0 to +2V, f = 1.25MHz

100Ω

V_IN

+5VDC

0 to –2V

V_OUT

OPA620

To Active Probe

(Channel 2)

–5VDC

on sampling scope.

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 error band of ±200µV centered around the final value

of 2V.

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).

FIGURE 7. Settling Time Test Circuit.

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

only 25ns to 0.01% for a 2V step, making the OPA620 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.

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

defined as the change in degrees of the closed-loop phase

over the same output voltage change. Both DG and DP are

specified at the NTSC sub-carrier frequency of 3.58MHz.

DG and DP increase with closed-loop gain and output

voltage transition as shown in the Typical Performance

Curves. All measurements were performed using a Tektronix

model VM700 Video Measurement Set.

In practice, settling time measurements on the OPA620

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-

OPA620

1...9 10 111213 14 15

中文翻译

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与OPA620SG相关器件

型号	品牌	获取价格	描述	数据表
OPA620SG/883B	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar, CDIP8, CERAMIC, DIP-8
OPA620SGQ	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar, CDIP8,
OPA621	BB	获取价格	Wideband Precision OPERATIONAL AMPLIFIER
OPA621AD	BB	获取价格	Operational Amplifier, 1 Func, BIPolar,
OPA621KG	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar, CDIP8, CERAMIC, DIP-8
OPA621KP	BB	获取价格	Wideband Precision OPERATIONAL AMPLIFIER
OPA621KP	ROCHESTER	获取价格	OP-AMP, 1000 uV OFFSET-MAX, 500 MHz BAND WIDTH, PDIP8, PLASTIC, DIP-8
OPA621KU	BB	获取价格	Wideband Precision OPERATIONAL AMPLIFIER
OPA621KU	ROCHESTER	获取价格	OP-AMP, 1000uV OFFSET-MAX, 500MHz BAND WIDTH, PDSO8, SO-8
OPA621KU/2K5	BB	获取价格	Operational Amplifier, 1 Func, 1000uV Offset-Max, BIPolar, PDSO8, PLASTIC, SOIC-8

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