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参数资料
| 型号： | LM4562NA/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 运算放大器 |
| 英文描述： | LM4562 Dual High Performance, High Fidelity Audio Operational Amplifier; Package: MDIP; No of Pins: 8; Qty per Container: 40/Rail |
| 中文描述： | DUAL OP-AMP, 700000 uV OFFSET-MAX, 55 MHz BAND WIDTH, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 16/34页 |
| 文件大小： | 1038K |
| 代理商： | LM4562NA/NOPB |
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Application Information
DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by LM4562
is below the capabilities of all commercially available equip-
ment. This makes distortion measurements just slightly more
difficult than simply connecting a distortion meter to the
amplifier’s inputs and outputs. The solution, however, is quite
simple: an additional resistor. Adding this resistor extends the
resolution of the distortion measurement equipment.
The LM4562’s low residual distortion is an input referred in-
ternal error. As shown in Figure 1, adding the 10
resistor
connected between the amplifier’s inverting and non-inverting
inputs changes the amplifier’s noise gain. The result is that
the error signal (distortion) is amplified by a factor of 101. Al-
though the amplifier’s closed-loop gain is unaltered, the feed-
back available to correct distortion errors is reduced by 101,
which means that measurement resolution increases by 101.
To ensure minimum effects on distortion measurements,
keep the value of R1 low as shown in Figure 1.
This technique is verified by duplicating the measurements
with high closed loop gain and/or making the measurements
at high frequencies. Doing so produces distortion compo-
nents that are within the measurement equipment’s capabili-
ties. This datasheet’s THD+N and IMD values were generat-
ed using the above described circuit connected to an Audio
Precision System Two Cascade.
201572k4
FIGURE 1. THD+N and IMD Distortion Test Circuit
23
www.national.com
LM4562
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| LM4565F | 制造商:ROHM 制造商全称:Rohm 功能描述:Low Noise Operational Amplifier |
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| LM4570LQ/NOPB | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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