Datasheet > AD823A_12

AD823A_12

更新时间： 2022-10-09 09:18:41

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	509K
描述
Wide Supply Dual, 17 MHz, Rail-to-Rail

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

AD823A_12 数据手册

AD823A

Data Sheet

THEORY OF OPERATION

The AD823A is a dual voltage feedback amplifier with an

N-channel JFET input stage and a rail-to-rail bipolar output

stage. It is fabricated on the Analog Devices, Inc. XFCB process,

a dielectrically isolated complementary bipolar process featuring

high speed 36 V bipolar devices along with JFETs and thin film

resistors. The N-channel input stage handles signals up to 200 mV

below the negative supply while maintaining picoamp level

input currents. The rail-to-rail output maximizes the amplifier’s

output range and can provide up to 40 mA linear drive current

with output voltages within .5 V of either power rail. Laser-

trimmed thin film resistors are used to optimize offset voltage

(3.5 mV max over the entire supply range) and offset voltage

drift (typical 1 uV/°C).

With 105 dB of open-loop gain, the output impedance is reduced

to <0.01 Ω. At higher frequencies, the output impedance rises as

the open-loop gain of the op amp drops; however, the output also

becomes capacitive due to the integrator capacitor. This

prevents the output impedance from ever becoming excessively

high (see Figure 21), which can cause stability problems when

driving capacitive loads. In fact, the AD823A has excellent

capacitive load drive capability for a high frequency op amp.

Figure 36 shows the results of the AD823A connected as a

follower while driving a 470 pF direct capacitive load. Under

these conditions, the phase margin is approximately 35°. For a

greater phase margin, use a low value resistor in series with the

output to decouple the effect of the load capacitance from the

op amp (see Figure 28). In addition, running the part at higher

gains also improves the capacitive load drive capability of the

op amp.

Figure 38 shows the architecture of an amplifier. Two stages are

used, with the first stage folded cascode input driving the

differential input of the second stage output. The voltage swing

at nodes S1p and S1n are kept small to minimize the generation

of nonlinear currents due to junction capacitances. This improves

distortion performance. Inputs and outputs of the amplifier are

fully protected with dedicated ESD diodes.

OUTPUT IMPEDANCE

The low frequency open-loop output impedance of the common-

emitter output stage used in this design is approximately 50 kΩ.

Although this is significantly higher than a typical emitter follower

output stage, when it is connected with feedback, the open-loop

gain of the op amp reduces the output impedance.

BIAS

OUTPUT

DRIVE

–IN

+IN

OUT

S1P

S1N

–V

Figure 38. Simplified Schematic

Rev.B | Page 14 of 20

1...11 12 131415 16 17...20

中文翻译

下载PDF

与AD823A_12相关器件

型号	品牌	获取价格	描述	数据表
AD823A-2AR-EBZ	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823A-2ARM-EBZ	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823AARMZ	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823AARMZ-R7	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823AARZ	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823AARZ-R7	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823AARZ-RL	ADI	获取价格	Wide Supply Dual, 17 MHz, Rail-to-Rail
AD823AN	ADI	获取价格	Dual, 16 MHz, Rail-to-Rail FET Input Amplifier
AD823ANZ	ADI	获取价格	Dual, 16 MHz, Rail-to-Rail FET Input Amplifier
AD823AR	ADI	获取价格	Dual, 16 MHz, Rail-to-Rail FET Input Amplifier

与AD823A_12相关文章

深入解读IR2103资料手册：引脚说明、电气参数及替换型号推荐
2024-06-06

2
L7805CV手册解读：引脚说明、替代型号推荐、好坏检测
2024-06-06

2
MMBT5551资料手册解读：电气参数、替换型号推荐
2024-06-06

2
APW7073资料手册解读：产品特性、引脚说明、替换型号推荐
2024-06-06

1

产品中心

服务支持

精选活动

关于我们

帮助中心

AD823A_12

AD823A_12 数据手册

与AD823A_12相关器件

与AD823A_12相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

AD823A_12

AD823A_12 数据手册

与AD823A_12相关器件

与AD823A_12相关文章

您还可以找

您在本页遇到什么问题？