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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： | 4/32页 |
| 文件大小： | 698K |
| 代理商： | TPA6030A4PWP |
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TPA6030A4
SLOS395B DECEMBER 2002 REVISED JANUARY 2005
www.ti.com
12
APPLICATION INFORMATION
VOLUME, SEDIFF, AND SEMAX OPERATION
The three pins labeled VOLUME, SEDIFF, and SEMAX control the speaker (BTL) volume (VOLUME pin only) and the
headphone (SE) volume. All three of these pins are controlled with a dc voltage. These voltages are a percentage of the
voltage on the 5VREF pin. The 5VREF pin sources up to 5 mA when VCC = 12 V. It is specifically designed to be a reference
voltage supply for the volume control that can be used with analog-to-digital converters (ADCs), resistor divider networks,
and potentiometers.
When driving in BTL mode, the VOLUME pin is the only pin that controls the volume. Table 1 shows the different volumes
and the corresponding voltages applied to the VOLUME pin. When driving in SE mode, all three pins can be used to control
the volume. Table 2 shows the different headphone volumes and the corresponding voltages applied to each pin.
The TPA6030A4 allows the user to specify a difference between the BTL volume and the SE volume. This is desirable
because it allows the user to avoid any listening discomfort when plugging in headphones. The volume in headphone mode
is proportional to that in speaker mode, and is no less than 6 dB lower (refer to the section labeled bridgetied load versus
single-ended load for an explanation).
The SEDIFF and SEMAX pins control the difference in volume between speaker and headphone modes. As the voltage
on the SEDIFF pin is increased, the difference between the BTL and SE volumes is also increased. Applying a lower voltage
on the SEDIFF pin decreases the volume difference. So, for example, if the speaker volume was set to 36 dB, and SEMAX
was set to 5VREF, one could vary SEDIFF to get a headphone volume from as much as 30 dB to as little as –86 dB, or
mute.
The SEMAX pin can be used to set the maximum possible headphone volume. The greater the voltage applied to this pin,
the higher the maximum volume. If the voltage reaches 5VREF, any volume level set by the VOLUME and SEDIFF pins
passes on through to the headphones. Should the voltage on SEMAX go to 0 V, the headphones would be muted,
regardless of what voltage is applied to the VOLUME and SEDIFF pins. The level set by the SEMAX pin does not affect
headphone volumes below that maximum level. Table 2 shows examples of how these pins interact with each other.
+
VOLUME
SEDIFF
SEMAX
Control
2:1 Mux
VOLUMESEDIFF
SEMAX
To Next Stage of
32-Step Volume
Control
Figure 14. Block Diagram of the SE Volume Control
Table 2. Assorted Headphone and Speaker Volume Configurations
MODE
VOLTAGE ON
VOLUME PIN
(%5VREF)
VOLTAGE ON
SEDIFF PIN
(%5VREF)
VOLTAGE ON
SEMAX PIN
(%5VREF)
HEADPHONE
VOLUME
dB
SPEAKER
VOLUME
dB
HP
100
0
100
30
N/A
HP
0
100
86
N/A
HP
100
0
86
N/A
HP
60
0
100
2.13
N/A
HP
100
40
18.13
N/A
HP
100
40
80
2.13
N/A
Speaker
60
0
100
N/A
8.13
Speaker
100
X
N/A
36
Speaker
0
X
N/A
80
X = Don’t care
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