TLV320AIC3212_15 Datasheet, PDF (54/78 Pages) Texas Instruments – TLV320AIC3212 Ultra-Low Power Stereo Audio Codec With Receiver Driver, DirectPath Headphone, and Stereo Class-D Speaker Amplifier

TLV320AIC3212
SLAS784A – MARCH 2012 – REVISED SEPTEMBER 2015
www.ti.com
10.3.9 Device Special Functions
The following special functions are available to support advanced system requirements:
• SAR ADC
• Headset detection
• Interrupt generation
• Flexible pin multiplexing
For more detailed information see the Application Reference Guide, SLAU360.
10.4 Device Functional Modes
10.4.1 Recording Mode
The recording mode is activated once the ADC side is enabled. The record path operates from 8 kHz mono to
192 kHz stereo recording, and contains programmable input channel configurations supporting single-ended and
differential setups, as well as floating or mixing input signals. In order to provide optimal system power
management, the stereo recording path can be powered up one channel at a time, to support the case where
only mono record capability is required. Digital signal processing blocks can remove audible noise that may be
introduced by mechanical coupling. The record path can also be configured as a stereo digital microphone PDM
interface typically used at 64 Fs or 128 Fs. The TLV320AIC3212 includes Automatic Gain Control (AGC) for ADC
recording.
10.4.2 Playback Mode
Once the DAC side is enabled, the playback mode is activated. The playback path offers signal processing
blocks for filtering and effects; headphone, line, receiver, and Class-D speaker outputs; flexible mixing of DAC;
and analog input signals as well as programmable volume controls. The playback path contains two high-power
headphone output drivers which eliminate the need for ac coupling capacitors. These headphone output drivers
can be configured in multiple ways, including stereo and mono BTL. In addition, playback audio can be routed to
integrated stereo Class-D speaker drivers or a differential receiver amplifier.
10.4.3 Analog Low Power Bypass Modes
The TLV320AIC3212 is a versatile device designed for ultra 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 analog low power bypass path. The
bypass path modes let the device to save power by turning off unused stages, like ADC, DAC and PGA.
The TLV320AIC3212 offers two analog-bypass modes. In either of the modes, an analog input signal can be
routed form an analog input pin to an amplifier driving an analog output pin. Neither the ADC nor the DAC
resources are required for such operation; this supports low-power operation during analog-bypass mode. In
analog low-power bypass mode, line level signals can be routed directly form the analog inputs IN1L to the left
lineout amplifier (LOL) and IN1R to LOR. Additionally, line-level signals can be routed directly from these analog
inputs to the differential receiver amplifier, which outputs on RECP and RECM.
In analog low-power bypass mode, line-level signals can be routed directly from the analog inputs IN1L to the
positive input on differential receiver amplifier (RECP) and IN1R to RECM, with gain control of –78 dB to 0 dB.
This is configured on B0_P1_R38_D[6:0] for the channel and B0_P1_R38_D[6:0] for the left channel and
B0_P1_R39_D[6:0] for the right channel.
To use the mixer amplifiers, power them on through B0_P1_R17_D[3:2].
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