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参数资料
| 型号： | TPA6030A4PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| 封装： | GREEN, PLASTIC, TSSOP-28 |
| 文件页数： | 30/32页 |
| 文件大小： | 698K |
| 代理商： | TPA6030A4PWP |
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TPA6030A4
SLOS395B DECEMBER 2002 REVISED JANUARY 2005
www.ti.com
7
The volume in single-ended (SE) mode is determined by the following equation:
SE Volume + min [(VOLUME * SEDIFF) or (SEMAX)]*6dB, where VOLUME is the voltage (expressed in terms
of %VREF) applied to the VOLUME pin, SEDIFF is the voltage (%VREF) applied to the SEDIFF pin, and SEMAX is the
voltage (%VREF) applied to the SEMAX pin. The SE Volume control is integrated into the 32-step volume control. A block
diagram of the SE Volume control portion is shown in Figure 1.
+
VOLUME
SEDIFF
SEMAX
Control
2:1 Mux
VOLUMESEDIFF
SEMAX
To Next Stage of
32-Step Volume
Control
Figure 1. Block Diagram of the SE Volume Control
Refer to the section entitled Volume Control Description in the Application Information section of this data sheet for more
details regarding the use of the volume control.
Speaker Volume
Headphone Volume With
SEMAX Set to 5VREF
Headphone Volume With
SEMAX Set to 7.2 dB
VOLUME CONTROL
40
30
20
10
0
10
20
30
40
50
60
70
80
90
010
20
30
40
50
%5VREF
60
70
80
90
100
Volume
dB
SEDIFF = 0 V
Figure 2. Speakers (BTL) and Headphones (SE) Volume vs %5VREF
Figure 2 illustrates the functionality of the TPA6030A4 volume control. As the voltage applied to the VOLUME control pin
is increased, the volume increases.
Increasing the voltage on the SEDIFF pin increases the delta in volume between speaker (BTL) and headphone (SE)
volume from a minimum of 6 dB to a maximum reduction in headphone volume, resulting in mute.
The SEMAX input limits the maximum output level in headphone mode. The dashed line shows operation with SEMAX
set to 5VREF, which results in maximum output in headphone mode. The horizontal line in Figure 2 shows operation with
SEDIFF set to 0V, and SEMAX set to 67.3% of 5VREF, for a maximum volume in headphone mode of 7.2 dB.
Neither SEMAX nor SEDIFF have any affect on the volume in speaker mode.
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