ZHCS294G June 2011 – May 2024 TPA6211A1-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Pin Configuration and Functions
- 5 Specifications
- 6 Detailed Description
-
7 Application and Implementation
- 7.1 Application Information
- 7.2
Typical Applications
- 7.2.1
Typical Differential Input Application
- 7.2.1.1 Design Requirements
- 7.2.1.2 Detailed Design Procedure
- 7.2.1.3 Application Curves
- 7.2.2 Other Application Circuits
- 7.2.1
Typical Differential Input Application
- 7.3 Power Supply Recommendations
- 7.4 Layout
- 8 Device and Documentation Support
- 9 Revision History
- 10Mechanical, Packaging, and Orderable Information
7.2.1.2.3 Input Capacitor (CI)
The TPA6211A1-Q1 device does not require input coupling capacitors when driven by a differential input source biased from 0.5 V to VDD – 0.8 V. Use 1% tolerance or better gain-setting resistors if not using input coupling capacitors.
In the single-ended input application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to the proper DC level. In this case, CI and RI form a high-pass filter with the corner frequency defined in Equation 20.
Figure 7-2 Input Filter Cutoff FrequencyThe value of CI is an important consideration, as it directly affects the bass (low frequency) performance of the circuit. Consider the example where RI is 10 kΩ and the specification calls for a flat bass response down to 100 Hz. Equation 20 is reconfigured as Equation 21.
In this example, CI is 0.16 µF, so the likely choice ranges from 0.22 µF to 0.47 µF. TI recommends the use of ceramic capacitors because they are the best choice in preventing leakage current. When polarized capacitors are used, the positive side of the capacitor faces the amplifier input in most applications. The input DC level is held at VDD / 2, typically higher than the source DC level. Confirming the capacitor polarity in the application is important.