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TAS5441-Q1 bảng dữ liệu(PDF) 21 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  TAS5441-Q1 22-W Analog Input 1-Channel Automotive Class-D Audio Amplifier with Load Dump and I2C Diagnostics
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SLOSE41 – APRIL 2020
Product Folder Links: TAS5441-Q1
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Copyright © 2020, Texas Instruments Incorporated
8.2.1.4 Analog Audio Input Filter
The circuit requires an input capacitor to allow biasing of the amplifier put to the proper dc level. The input
capacitor and the input impedance of the amplifier form a high-pass filter with a –3-dB corner frequency
determined by the equation: f = 1 / (2πR(i)C(i)), where R(i) is the input impedance of the device based on the gain
setting and C(i) is the input capacitor value. Table 10 lists largest recommended input capacitor values. Use a
capacitor which matches the application requirement for the lowest frequency but does not exceed the values
listed.
Table 10. Recommended Input AC-Coupling Capacitors
GAIN (dB)
TYPICAL INPUT IMPEDANCE
(kΩ)
INPUT CAPACITANCE (µF)
HIGH-PASS FILTER (Hz)
20
60
1
2.7
1.5
1.8
26
30
1
5.3
3.3
1.6
32
15
5.6
2.3
36
9
10
1.8
8.2.2 Detailed Design Procedure
Use the following steps for the design procedure:
Step 1: Hardware Schematic Design: Using the Figure 17 as a guide, integrate the hardware into the system
schematic.
Step 2: Following the layout guidelines recommended in the Layout Guidelines section, integrate the device
and its supporting components into the system PCB file.
Step 3: Thermal Design: The device has an exposed thermal pad which requires proper soldering. For more
information, see Semiconductor and IC Package Thermal Metrics and PowerPAD Thermally Enhanced
Package.
Step 4: Develop software: The EVM User's Guide has detailed instructions for how to set up the device,
interpret diagnostic information, and so forth. For information about control registers, see the Register Maps
section.
For questions and support, go to the E2E forums.
8.2.2.1 Unused Pin Connections
Even if unused, always connect pins to a fixed rail; do not leave them floating. Floating input pins represent an
ESD risk, therefore the user must adhere to the following guidance for each pin.
8.2.2.1.1
MUTE Pin
If the MUTE pin is unused in the application, connect it to GND through a high-impedance resistor.
8.2.2.1.2
STANDBY Pin
If the STANDBY pin is unused in the application, connect it to a low-voltage rail such as 3.3 V or 5 V through a
high-impedance resistor.
8.2.2.1.3
I
2C Pins (SDA and SCL)
If there is no microcontroller in the system, use of the device without I2C communication is possible. In this
situation, connect the SDA and SCL pins to 3.3 V.
8.2.2.1.4
Terminating Unused Outputs
If the FAULT pin does not report to a system microcontroller in the application, connect it to GND.


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