參數(shù)資料
型號： TPA6045A4CRHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32
封裝： QFN-32
文件頁數(shù)： 11/30頁
文件大小： 1147K
代理商： TPA6045A4CRHBR
Gain Setting via GAIN0 and GAIN1 Inputs
Input Capacitor, CI
(1)
C
I +
1
2pR
I fc
(2)
www.ti.com.............................................................................................................................................................................................. SLOS614 – OCTOBER 2008
One of the primary advantages of the fully differential amplifier is improved RF immunity. GSM handsets save
power by turning on and off the RF transmitter at a rate of 217 Hz. The transmitted signal is picked up on input
and output traces. The fully differential amplifier cancels the signal and others of this type much better than
typical audio amplifiers.
The gain of the TPA6045A4C is set by two terminals, GAIN0 and GAIN1. The gains listed in Table 1 are realized
by changing the taps on the input resistors and feedback resistors inside the amplifier. This causes the input
impedance (ZI) to vary as a function of the gain setting.
Gain Setting
AMPLIFIER GAIN
INPUT IMPEDANCE (k
)
(dB)
GAIN1
GAIN0
TYPICAL
0
10
78
0
1
12
65
1
0
15.6
46
1
21.6
20
The input capacitor allows the amplifier to bias the input signal to the proper dc level for proper operation. In this
case, the input capacitor, CI, and the input impedance of the amplifier, RI, form a high-pass filter with the corner
frequency determined in Equation 1. Figure 40 shows how the input capacitor and the input resistor within the
amplifier interact.
Figure 40. Input Resistor and Input Capacitor
The value of CI is important to consider as it directly affects the low-frequency, or bass, performance of the
circuit. Furthermore, the input impedance changes with a change in volume. The higher the volume, the lower
the input impedance is. To determine the appropriate capacitor value, reconfigure Equation 1 into Equation 2.
The value of the input resistor, RI, can be determined from Equation 2.
Low-leakage tantalum or ceramic capacitors are recommended. When polarized capacitors are used, the positive
side of the capacitor should face the amplifier input in most applications as the dc level there is held at VCC/2,
which is likely higher than the source dc level. Note that it is important to confirm the capacitor polarity in each
specific application. Recommended capacitor values are between 0.1
F and 1 F.
Copyright 2008, Texas Instruments Incorporated
19
Product Folder Link(s): TPA6045A4C
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PDF描述
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TPA6100A2D 功能描述:音頻放大器 Ultra Low Voltage Stereo Headphone RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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