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參數(shù)資料
| 型號(hào)： | TSC2100IRHBRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 26/77頁 |
| 文件大小： | 1079K |
| 代理商： | TSC2100IRHBRG4 |
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TSC2100
SLAS378 NOVEMBER 2003
www.ti.com
32
AUDIO OUTPUT DRIVERS
The TSC2100 features audio output drivers which can be configured in either low power mode or high power mode
depending on the load and output power required. By default, at reset the output drivers are configured in low power mode.
In this mode, the output drivers can drive a full-scale line-level signal into loads of 10 k minimum or drive moderate
amplitude signals into loads of 16 minimum.
The output drivers can also be configured in high power mode by setting bit D12 of Reg05H/Page2 to 1. In this mode, each
output driver can deliver up to 30 mW per channel into a headphone speaker load of 16 . The headphones can be
connected in a single ended configuration using ac-coupling capacitors, or the capacitors can be removed and virtual
ground (VGND) powered for a capless output connection. The typical headphone jack configuration for these two modes
is shown in Figure 30. Note that the VGND amplifier must be powered if the capless configuration is used.
In the case of an ac-coupled output, the value of the capacitors is typically chosen based on the amount of low-frequency
cut that can be tolerated. The capacitor in series with the load impedance forms a high-pass filter with 3 dB cutoff frequency
of 1/(2πRC) in Hz, where R is the impedance of the headphones. Use of an overly small capacitor reduces low-frequency
components in the signal output and lead to low-quality audio. When driving 16- headphones, capacitors of 220-F (a
commonly used value) result in a high-pass filter cutoff frequency of 45 Hz, although reducing these capacitors to 50 F
results in a cutoff frequency of 199 Hz, which is generally considered noticeable when playing music. The cutoff frequency
is reduced to half of the above values if 32- headphones are used instead of 16 .
The TSC2100 programmable digital effects block can be used to help reduce the size of capacitors needed by implementing
a low frequency boost function to help compensate for the high-pass filter introduced by the ac-coupling capacitors. For
example, by using 50-F capacitors and setting the TSC2100 programmable filter coefficients as shown below, the
frequency response can be improved as shown in Figure 29.
Filter coefficients (use the same for both channels):
N0 = 32767, N1 = 32346, N2 = 31925, N3 = 32767, N4 = 0, N5 = 0
D0 = 32738, D1 = 32708 D4 = 0, D5 = 0
10
12
16
20
0 100 200 300 400 500 600
Gain
dB
6
4
f Frequency Hz
0
700 800 900 1 k
18
14
8
2
Figure 28. Uncompensated Response For 16-W Load and 50-mF Decoupling Capacitor
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| TSC2101_08 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO CODEC WITH INTEGRATED HEADPHONE, SPEAKER AMPLIFIER AND TOUCH SCREEN CONTROLLER |
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