Datasheet

0dBto –78dB
0dBto –78dB
0dBto –78dB
0dBto –78dB
+
PGA_L
PGA_R
DAC_L1
DAC_R1
B0158-01
ANALOG HIGH-POWER OUTPUT DRIVERS
TLV320AIC3101
www.ti.com ........................................................................................................................................ SLAS520D – FEBRUARY 2007 – REVISED DECEMBER 2008
Figure 32. Detail of the Volume Control and Mixing Function Shown in Figure 27 and Figure 17
The DAC_L/R signals are the outputs of the stereo audio DAC, which can be steered by register control based
on the requirements of the system. If mixing of the DAC audio with other signals is not required, and the DAC
output is only needed at the stereo line outputs, then it is recommended to use the routing through path
DAC_L3/R3 to the fully differential stereo line outputs. This results not only in higher quality output performance,
but also in lower-power operation, because the analog volume controls and mixing blocks ahead of these drivers
can be powered down.
If instead the DAC analog output must be routed to multiple output drivers simultaneously (such as to
LEFT_LOP/M and RIGHT_LOP/M) or must be mixed with other analog signals, then the DAC outputs should be
switched through the DAC_L1/R1 path. This option provides the maximum flexibility for routing of the DAC
analog signals to the output drivers
The TLV320AIC3101 includes an output level control on each output driver with limited gain adjustment from 0
dB to 9 dB. The output driver circuitry in this device are designed to provide a low distortion output while playing
full-scale stereo DAC signals at a 0-dB gain setting. However, a higher amplitude output can be obtained at the
cost of increased signal distortion at the output. This output level control allows the user to make this tradeoff
based on the requirements of the end equipment. Note that this output level control is not intended to be used as
a standard output volume control. It is expected to be used only sparingly for level setting, i.e., adjustment of the
fullscale output range of the device.
Each differential line output driver can be powered down independently of the others when it is not needed in the
system. When placed into power down through register programming, the driver output pins are placed into a
high-impedance state.
The TLV320AIC3101 includes four high-power output drivers with extensive flexibility in their usage. These
output drivers are individually capable of driving 30 mW each into a 16- Ω load in single-ended configuration, and
they can be used in pairs to drive up to 500 mW into an 8- Ω load connected in bridge-terminated load (BTL)
configuration between two driver outputs.
The high-power output drivers can be configured in a variety of ways, including:
1. Driving up to two fully differential output signals
2. Driving up to four single-ended output signals
3. Driving two single-ended output signals, with one or two of the remaining drivers driving a fixed VCM level,
for a pseudodifferential stereo output
4. Driving one or two 8- Ω speakers connected BTL between pairs of driver output pins
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