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参数资料
| 型号： | TPA2012D2RTJRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-20 |
| 文件页数： | 4/22页 |
| 文件大小： | 785K |
| 代理商： | TPA2012D2RTJRG4 |
Decoupling Capacitor (CS)
Input Capacitors (CI)
fc +
1
2p R
ICI
(1)
C
I +
1
2p R
I f
c
(2)
SLOS438D – DECEMBER 2004 – REVISED JUNE 2008 .................................................................................................................................................. www.ti.com
The TPA2012D2 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling
to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
spikes, or digital hash on the line a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1
F, placed as close as possible to the device PV
DD lead works best. Placing this decoupling capacitor close to
the TPA2012D2 is important for the efficiency of the Class-D amplifier, because any resistance or inductance in
the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise
signals, a 4.7
F or greater capacitor placed near the audio power amplifier would also help, but it is not required
in most applications because of the high PSRR of this device.
Table 1. Gain Setting
INPUT IMPEDANCE
GAIN
G1
G0
(RI)
(V/V)
(dB)
(k
)
0
2
6
28.1
0
1
4
12
17.3
1
0
8
18
9.8
1
16
24
5.2
The TPA2012D2 does not require input coupling capacitors if the design uses a differential source that is biased
from 0.5 V to VDD – 0.8 V. If the input signal is not biased within the recommended common-mode input range, if
high pass filtering is needed (see Figure 34), or if using a single-ended source (see Figure 35), input coupling
capacitors are required.
The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in
The value of the input capacitor is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the
corner frequency can be set to block low frequencies in this application. Not using input capacitors can increase
output offset.
Equation 2 is used to solve for the input coupling capacitance.
If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.
12
Copyright 2004–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2012D2
相关PDF资料 |
PDF描述 |
|---|---|
| TPA2012D2RTJR | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| TPA2012D2RTJTG4 | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| TPA2012D2RTJT | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| TPA2012D2YZHR | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA16 |
| TPA2012D2YZHT | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA2012D2RTJT | 功能描述:音频放大器 2.1W Stereo Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2012D2RTJTG4 | 功能描述:音频放大器 2.1W Stereo Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2012D2YZH | 制造商:TI 制造商全称:Texas Instruments 功能描述:2.1 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| TPA2012D2YZHR | 功能描述:音频放大器 2.1W Stereo Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2012D2YZHT | 功能描述:音频放大器 2.1W Stereo Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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