ZHCSH34E November 2017 – August 2021 OPA2375 , OPA375
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
封装选项
机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息
9.2.2 Detailed Design Procedure
The transfer function defining the relationship between VOUT and the AC input signal is shown in Equation 1.
The required gain can be calculated based on the expected input signal level and desired output level as shown in Equation 2.
Select a standard 10-kΩ feedback resistor and calculate RG from Equation 3.
To minimize the attenuation in the desired passband from 300 Hz to 3 kHz, set the upper (fH) and lower (fL) cutoff frequencies outside of the desired bandwidth as:
and
Select CG to set the fL cutoff frequency using Equation 6.
Select CF to set the fH cutoff frequency using Equation 7.
The input signal cutoff frequency must be set low enough such that low-frequency sound waves still pass through. Therefore select CIN to achieve a 30-Hz cutoff frequency (fIN) using Equation 8.
The measured transfer function for the microphone preamplifier circuit is shown in Figure 9-2 and the measured THD + N performance of the microphone preamplifier circuit is shown in Figure 9-3.