參數(shù)資料
型號(hào)： TLV320AIC34_1
廠商： Texas Instruments, Inc.
元件分類： Codec
英文描述： FOUR-CHANNEL, LOW-POWER AUDIO CODEC FOR PORTABLE AUDIO/TELEPHONY
中文描述： 四通道，低功耗音頻編解碼器的便攜式音頻/電話
文件頁(yè)數(shù)： 50/94頁(yè)
文件大?。?/td> 905K
代理商： TLV320AIC34_1
www.ti.com
SHORT-CIRCUIT OUTPUT PROTECTION
The TLV320AIC34 includes programmable short-circuit protection for the high-power output drivers, for maximum
flexibility in a given application. By default, if these output drivers are shorted, they automatically limit the
maximum amount of current that can be sourced to or sunk from a load, thereby protecting the device from an
overcurrent condition. In this mode, the user can read page 0, register 95 to determine whether the part is in
short-circuit protection or not, and then decide whether to program the device to power down the output drivers.
However, the device includes further capability to power down an output driver automatically whenever it goes
into short-circuit protection, without requiring intervention from the user. In this case, the output driver stays in a
power-down condition until the user specifically programs it to power down and then power back up again, to
clear the short-circuit flag.
J ACK/HEADSET DETECTION
The TLV320AIC34 includes extensive capability to monitor a headphone, microphone, or headset jack,
determine if a plug has been inserted into the jack, and then determine what type of headset/headphone is wired
to the plug.
Figure 36
shows one configuration of the device that enables detection and determination of headset
type when a pseudodifferential (capless) stereo headphone output configuration is used. The registers used for
this function are page 0, registers 13, 14, 37, and 38. The type of headset detected can be read back from
page 0, register 13. Note that for best results, it is recommended to select a MICBIAS_x value as high as
possible, and to program the output driver common-mode level at a 1.35-V or 1.5-V level.
TLV320AIC34
SLAS538A–OCTOBER 2007–REVISED NOVEMBER 2007
The high-power output drivers include additional circuitry to avoid artifacts on the audio output during power-on
and power-off transient conditions. The user should first program the type of output configuration being used in
page 0, register 14, to allow the device to select the optimal power-up scheme to avoid output artifacts. The
power-up delay time for the high-power output drivers is also programmable over a wide range of time delays,
from instantaneous up to 4 s, using page 0, register 42.
When these output drivers are powered down, they can be placed into a variety of output conditions based on
register programming. If lowest-power operation is desired, then the outputs can be placed into a
high-impedance state, and all power to the output stage is removed. However, this generally results in the output
nodes drifting to rest near the upper or lower analog supply, due to small leakage currents at the terminals. This
then results in a longer delay requirement to avoid output artifacts during driver power-on. In order to reduce this
required power-on delay, the TLV320AIC34 includes an option for the output terminals of the drivers to be weakly
driven to the VCM level at which they would normally when powered with no signal applied. This output VCM
level is determined by an internal band-gap voltage reference, and thus results in extra power dissipation when
the drivers are in power down. However, this option provides the fastest method for transitioning the drivers from
power down to full-power operation without any output artifact introduced.
The device includes a further option that falls between the other two—although it requires less power drawn
while the output drivers are in power down, it takes a slightly longer delay to power up without artifact than if the
band-gap reference is kept alive. In this alternate mode, the powered-down output driver terminal is weakly
driven to a voltage of approximately half the DRVDD1/2 supply level using an internal voltage divider. This
voltage does not match the actual VCM of a fully powered driver, but due to the output voltage being close to its
final value, a much shorter power-up delay time setting can be used and still avoid any audible output artifacts.
These output voltage options are controlled in page 0, register 42.
The high-power output drivers can also be programmed to power up first with the output level control in a highly
attenuated state, then the output driver automatically slowly reduces the output attenuation to reach the desired
output level setting programmed. This capability is enabled by default but can be enabled in page 0, register 40.
50
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
TLV320AIC34
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參數(shù)描述
TLV320AIC34EVM-K 功能描述:音頻 IC 開(kāi)發(fā)工具 TLV320AIC34EVM-K Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TLV320AIC34IZAS 功能描述:接口—CODEC Low-Pwr 4-channel CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC34IZASR 功能描述:接口—CODEC Low-Pwr 4-channel CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC36 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low Power Stereo Audio Codec With Embedded miniDSP
TLV320AIC36EVM-K 功能描述:音頻 IC 開(kāi)發(fā)工具 TLV320AIC36 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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