參數(shù)資料
型號(hào)： TLV320AIC11PFB
廠商： Texas Instruments, Inc.
英文描述： Labels; External Height:0.275"; External Width:1"; Label Material:Metalized Polyester
中文描述： 通用低電壓1.1V至3.6V的/ 0 16位22 kSPS的DSP的解碼器
文件頁(yè)數(shù)： 22/46頁(yè)
文件大?。?/td> 452K
代理商： TLV320AIC11PFB
SLAS428 AUGUST 2004
www.ti.com
22
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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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0
2.7
2.8
2.9
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AVDD, DRVDD V
3.1
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3.4
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3.6
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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