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| 型号： | TAS5601DCARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO56 |
| 封装： | GREEN, PLASTIC, HTSSOP-56 |
| 文件页数： | 11/26页 |
| 文件大小： | 2698K |
| 代理商： | TAS5601DCARG4 |
DIFFERENTIAL INPUT AND BTL OUTPUT (TAS5601 Mono Configuration)
C
IN
AudioPower
Amplifier
Generator
C
IN
R
GEN
R
GEN
R
IN
R
IN
V
GEN
Analyzer
R
ANA
R
ANA
C
ANA
R
L
C
ANA
Twisted-PairWire
EvaluationModule
Twisted-PairWire
Lfilt
Cfilt
www.ti.com....................................................................................................................................... SLAS585A – FEBRUARY 2008 – REVISED SEPTEMBER 2008
Many of the class-D APAs and many class-AB APAs have differential inputs and bridge-tied-load (BTL) outputs.
Differential inputs have two input pins per channel and amplify the difference in voltage between the pins.
Differential inputs reduce the common-mode noise and distortion of the input circuit. BTL is a term commonly
used in audio to describe differential outputs. BTL outputs have two output pins providing voltages that are 180°
out of phase. The load is connected between these pins. This has the added benefits of quadrupling the output
power to the load and eliminating a dc-blocking capacitor.
A block diagram of the measurement circuit is shown in Figure 21. The differential input is a balanced input,
meaning the positive (+) and negative (–) pins have the same impedance to ground. Similarly, the BTL output
equates to a balanced output.
Figure 21. Differential Input, BTL Output Measurement Circuit
The generator should have balanced outputs, and the signal should be balanced for best results. An unbalanced
output can be used, but it may create a ground loop that affects the measurement accuracy. The analyzer must
also have balanced inputs for the system to be fully balanced, thereby cancelling out any common-mode noise in
the circuit and providing the most accurate measurement.
The following general rules should be followed when connecting to APAs with differential inputs and BTL outputs:
Use a balanced source to supply the input signal.
Use an analyzer with balanced inputs.
Use twisted-pair wire for all connections.
Use shielding when the system environment is noisy.
Ensure that the cables from the power supply to the APA, and from the APA to the load, can handle the large
currents (see Table 3).
Table 3 shows the recommended wire size for the power supply and load cables of the APA system. The real
concern is the dc or ac power loss that occurs as the current flows through the cable. These recommendations
are based on 12-inch (30.5-cm)-long wire with a 20-kHz sine-wave signal at 25°C.
Table 3. Recommended Minimum Wire Size for Power Cables
DC POWER LOSS
AC POWER LOSS
POUT (W)
RL()
AWG Size
(mW)
10
4
18
22
16
40
18
42
2
4
18
22
3.2
8
3.7
8.5
1
8
22
28
2
8
2.1
8.1
< 0.75
8
22
28
1.5
6.1
1.6
6.2
Copyright 2008, Texas Instruments Incorporated
19
Product Folder Link(s): TAS5601
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| TAS5602DCAG4 | 功能描述:音频放大器 20W Stereo Dig Amp Pwr Stage w/ FB 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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