Datasheet

ToDetectionblock

HPLOUT

HPCOM

MICDET

Thisswitchcloseswhen

jackisremoved

TLV320AIC3107

www.ti.com

SLOS545D –NOVEMBER 2008–REVISED DECEMBER 2014

An output configuration for the case of the outputs driving fully differential stereo headphones is shown in

Figure 31. In this mode there is a requirement on the jack side that either HPCOM or HPLOUT get shorted to

ground if the plug is removed, which can be implemented using a spring terminal in a jack. For this mode to

function properly, short-circuit detection should be enabled and configured to power-down the drivers if a short-

circuit is detected. The registers that control this functionality are in Page-0/Reg-38/Bit-D2-D1.

Figure 31. Configuration of Device for Jack Detection Using a Fully Differential Stereo Headphone

Output Connection

10.4 Device Functional Modes

10.4.1 Bypass Path Mode

The TLV320AIC3107 is a versatile device designed for low-power applications. In some cases, only a few

features of the device are required. For these applications, the unused stages of the device must be powered

down to save power and an alternate route should be used. This is called a bypass path. The bypass path

modes let the device to save power by turning off unused stages, like ADC, DAC and PGA.

10.4.1.1 Analog Input Bypass Path Functionality

The TLV320AIC3107 includes the additional ability to route some analog input signals past the integrated data

converters, for mixing with other analog signals and then direct 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 TLV320AIC3107 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.

For fully-differential inputs, the TLV320AIC3107 provides the ability to pass the signals LINE2LP-LINE2LM and

LINE2RP-LINE2RM to the output stage directly. If in single-ended configuration, the device can pass the signal

LINE2LP and LINE2RP to the output stage directly.

10.4.1.2 ADC PGA Signal Bypass Path Functionality

In addition to the input bypass path described above, the TLV320AIC3107 also includes the ability to route the

ADC PGA output signals past the ADC, for mixing with other analog signals and then direct connection to the

output drivers. These bypass functions are described in more detail in the sections on output mixing and output

driver configurations.

Product Folder Links: TLV320AIC3107