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參數(shù)資料
| 型號： | TLV320AIC3107YZFR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 CHANNEL, AUDIO AMPLIFIER, PBGA42 |
| 封裝： | 3.50 X 3 MM, 0.50 MM PITCH, WSCP-42 |
| 文件頁數(shù)： | 31/94頁 |
| 文件大?。?/td> | 1183K |
| 代理商： | TLV320AIC3107YZFR |
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GAIN=0, 1.5, 3,.., 12dB,MUTE
LINE1LP
LINE1LM
LINE2LP
LINE2LM
LINE1RP
LINE1RM
TOLEFT ADC
PGA
GAIN=0, 6, 12dB,MUTE
GAIN=0, 1.5, 3,.., 12dB,MUTE
www.ti.com........................................................................................................................................... SLOS545B – NOVEMBER 2008 – REVISED JANUARY 2009
The TLV320AIC3107 includes seven analog audio input pins, which can be configured as up to three
fully-differential pair plus one single-ended audio inputs, or up to six single-ended audio inputs. . These pins
connect through series resistors and switches to the virtual ground terminals of two fully differential opamps (one
per ADC/PGA channel). By selecting to turn on only one set of switches per opamp at a time, the inputs can be
effectively muxed to each ADC PGA channel.
By selecting to turn on multiple sets of switches per opamp at a time, mixing can also be achieved. Mixing of
multiple inputs can easily lead to PGA outputs that exceed the range of the internal opamps, resulting in
saturation and clipping of the mixed output signal. Whenever mixing is being implemented, the user should take
adequate precautions to avoid such a saturation case from occurring. In general, the mixed signal should not
exceed 2 Vpp (single-ended) or 4 Vpp (differential).
In most mixing applications, there is also a general need to adjust the levels of the individual signals being
mixed. For example, if a soft signal and a large signal are to be mixed and played together, the soft signal
generally should be amplified to a level comparable to the large signal before mixing. In order to accommodate
this need, the TLV320AIC3107 includes input level control on each of the individual inputs before they are mixed
or muxed into the ADC PGAs, with gain programmable from 0 dB to –12 dB in 1.5 dB steps (except for LINE2
which has 6 dB steps). Note that this input level control is not intended to be a volume control, but instead used
occasionally for level setting. Soft-stepping of the input level control settings is implemented in this device, with
the speed and functionality following the settings used by the ADC PGA for soft-stepping.
The TLV320AIC3107 supports the ability to mix up to three fully-differential analog inputs into each ADC PGA
channel. Figure 30 shows the mixing configuration for the left channel, which can mix the signals
LINE1LP-LINE1LM, LINE2LP-LINE2LM, and LINE1RP-LINE1RM
Figure 30. Left Channel Fully-Differential Analog Input Mixing Configuration
Three fully-differential analog inputs can similarly be mixed into the right ADC PGA as well, consisting of
LINE1RP-LINE1RM, LINE2RP-LINE2RM, and LINE1LP-LINE1LM. Note that it is not necessary to mix all three
fully-differential signals if this is not desired – unnecessary inputs can simply be muted using the input level
control registers.
Copyright 2008–2009, Texas Instruments Incorporated
37
Product Folder Link(s): TLV320AIC3107
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