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参数资料
| 型号： | TPA6045A4CRHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| 封装： | QFN-32 |
| 文件页数： | 11/30页 |
| 文件大小： | 1147K |
| 代理商： | TPA6045A4CRHBR |
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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.
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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