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| 型号： | TPA2017D2RTJR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-20 |
| 文件页数： | 3/20页 |
| 文件大小： | 642K |
| 代理商： | TPA2017D2RTJR |
Gain-dB
V
-dBV
IN
www.ti.com ..................................................................................................................................................................................................... SLOS584 – APRIL 2009
Since the number of gain steps is limited the compression region is limited as well. The following figure shows
how the gain changes vs. the input signal amplitude in the compression region.
Figure 20. Input Signal Voltage vs Gain
Thus the AGC performs a mapping of the input signal vs. the output signal amplitude.
Pins AGC1 and AGC 2 are used to enable/disable the limiter, compression, and noise gate function. Table 1
shows each function.
Table 1. FUNCTION DEFINITION FOR AGC1 AND AGC2
AGC1
AGC2
Function
0
AGC Function disabled
0
1
AGC Limiter Function enabled
1
0
AGC, Limiter, and Compression Functions enabled
1
AGC, Limiter, Compression, and Noise Gate Functions enabled
The default values for the TPA2017D2 AGC function are given in Table 2. The default values can be changed at
the factory during production. Refer to the TI representative for assistance with different default value requests.
Table 2. AGC DEFAULT VALUES
Attack Time
6.4 ms / step
Release Time
1.81 sec/step
Fixed Gain
6 dB
NoiseGate Threshold
20 mV
Output Limiter Level
9 dBV
Max Gain
30 dB
Compression Ratio
2:1
Copyright 2009, Texas Instruments Incorporated
11
Product Folder Link(s): TPA2017D2
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