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| 型號： | TLV320AC57PT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3-V VOICE-BAND AUDIO PROCESSORS VBAPE |
| 中文描述： | 3伏的語音頻帶音頻處理器VBAPE |
| 文件頁數(shù)： | 22/46頁 |
| 文件大小： | 452K |
| 代理商： | TLV320AC57PT |
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SLAS428 AUGUST 2004
www.ti.com
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0
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PO Output Power mW
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2 VPP
T
2.402 VPP
Figure 17. THD vs Output Power Delivered to an an 8- Load (25 C, AVDD = DRVDD = 3.3 V, DVDD = 1.8
V, DAC Output Swing Set to 2 V and 2.4V, and Short-Circuit Protection Disabled)
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2.7
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AVDD, DRVDD V
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T
Figure 18. THD vs AVDD, DRVDD Supply Voltage (25 C When Driving a 1 dB, 1-kHz Sinewave From the
DAC Into an 8- Load, with DAC Output Swing Set to 2.4 V, and Short-Circuit Protection Disabled)
The ’DAC26 incorporates a programmable short-circuit detection/protection function with different modes of operation.
During the insertion or removal of a headphone plug from the jack, the output pins of the drivers may be accidentally shorted,
causing the part to potentially draw a huge current, which may cause the power supply voltages to dip. Bits D8D7 of
REG1DH/Page2 control how the short-circuit detection/protection operates in the ’DAC26. One option is to fully disable
short-circuit protection, which also enables the audio output drivers to deliver more power to a low-impedance load (such
as an 8-
speaker). However, care must be taken to prevent any short-circuit from occurring while the part is in this mode.
A second programmable configuration enables current-limiting in the audio output drivers, so that excessive currents
cannot be provided if the outputs are shorted. It also enables the internal short-circuit detection function, which can detect
excess current being drawn from the drivers and set a short-circuit detect flag (Page2, REG1DH, bit D6). This flag can
be read by the user to power down the drivers if desired. This flag is cleared only if the short-circuit condition is removed.
If the user does not monitor this flag and powers down the drivers when a short-circuit occurs, the current-limiting prevents
excessive currents from being drawn, but power dissipation is higher due to this limited current flowing through the short.
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