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| 型号： | TLV320AIC32IRHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 27/80页 |
| 文件大小： | 1270K |
| 代理商： | TLV320AIC32IRHBR |
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ANALOG INPUT BYPASS PATH FUNCTIONALITY
ADC PGA SIGNAL BYPASS PATH FUNCTIONALITY
INPUT IMPEDANCE AND VCM CONTROL
PASSIVE ANALOG BYPASS DURING POWER DOWN
www.ti.com ............................................................................................................................................. SLAS479C – AUGUST 2005 – REVISED DECEMBER 2008
The TLV320AIC3105 includes the additional ability to route some analog input signals past the integrated data
converters, for mixing with other analog signals and then direction connection to the output drivers. This
capability is useful in a cellphone, for example, when a separate FM radio device provides a stereo analog output
signal that needs to be routed to headphones. The TLV320AIC3105 supports this in a low power mode by
providing a direct analog path through the device to the output drivers, while all ADCs and DACs can be
completely powered down to save power. When programmed correctly, the device can pass the signal LINE2L
and LINE2R to the output stage directly.
In addition to the input bypass path described above, the TLV320AIC32 also includes the ability to route the ADC
PGA output signals past the ADC, for mixing with other analog signals and then direction connection to the
output drivers. These bypass functions are described in more detail in the sections on output mixing and output
driver configurations.
The TLV320AIC32 includes several programmable settings to control analog input pins, particularly when they
are not selected for connection to an ADC PGA. The default option allows unselected inputs to be put into a
tri-state condition, such that the input impedance seen looking into the device is extremely high. Note, however,
that the pins on the device do include protection diode circuits connected to AVDD and AVSS. Thus, if any
voltage is driven onto a pin approximately one diode drop (~0.6 V) above AVDD or one diode drop below AVSS,
these protection diodes will begin conducting current, resulting in an effective impedance that no longer appears
as a tri-state condition.
Another programmable option for unselected analog inputs is to weakly hold them at the common-mode input
voltage of the ADC PGA (which is determined by an internal bandgap voltage reference). This is useful to keep
the ac-coupling capacitors connected to analog inputs biased up at a normal DC level, thus avoiding the need for
them to charge up suddenly when the input is changed from being unselected to selected for connection to an
ADC PGA. This option is controlled in Page-0/Reg-20 and 23. The user should ensure this option is disabled
when an input is selected for connection to an ADC PGA or selected for the analog input bypass path, since it
can corrupt the recorded input signal if left operational when an input is selected.
In most cases, the analog input pins on the TLV320AIC32 should be ac-coupled to analog input sources, the
only exception to this generally being if an ADC is being used for DC voltage measurement. The ac-coupling
capacitor will cause a highpass filter pole to be inserted into the analog signal path, so the size of the capacitor
must be chosen to move that filter pole sufficiently low in frequency to cause minimal effect on the processed
analog signal. The input impedance of the analog inputs when selected for connection to an ADC PGA varies
with the setting of the input level control, starting at approximately 20 k
with an input level control setting of
0-dB, and increasing to approximately 80-k
when the input level control is set at –12 dB. For example, using a
0.1
F ac-coupling capacitor at an analog input will result in a highpass filter pole of 80 Hz when the 0 dB input
level control setting is selected.
Programming the TLV320AIC3105 to passive analog bypass occurs by configuring the output stage switches for
passthrough. This is done by opening switches SW-L0, SW-R0 and closing either SW-L1 or SW-L2 and SW-R1
or SW-R2. See Figure 30. Programming this mode is done by writing to page 0, register 108.
Connecting the MIC1L/LINE1L input signal to LEFT_LOP is done by closing SW-L1 and opening SW-L0; this
action is done by writing a 1 to page 0, register 108, bit D0. Connecting the MIC2L/LINE2L input signal to
LEFT_LOP is done by closing SW-L2 and opening SW-L0; this action is done by writing a 1 to page 0, register
108, bit D2.
Connecting the MIC1R/LINE1R input signal to RIGHT_LOP is done by closing SW-R1 and opening SW-R0; this
action is done by writing a 1 to page 0, register 108, bit D4. Connecting the MIC2R/LINE2R input signal to
RIGHT_LOP is done by closing SW-R2 and opening SW-R0; this action is done by writing a 1 to page 0, register
108, bit D6. A diagram of the passive analog bypass mode configuration can be seen in Figure 30.
Copyright 2005–2008, Texas Instruments Incorporated
33
Product Folder Link(s): TLV320AIC32
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