The TLV320AIC3212 (also referred to as the AIC3212) device is a flexible,
highly-integrated, low-power, low-voltage stereo audio codec. The AIC3212 features digital
microphone inputs and programmable outputs, PowerTune capabilities, selectable audio-processing
blocks, predefined and parameterizable signal processing blocks, integrated PLL, and flexible audio
interfaces. Extensive register-based control of power, input and output channel configuration,
gains, effects, pin-multiplexing and clocks are included, allowing the device to be precisely
targeted to its application.
Combined with the advanced PowerTune technology, the device can execute operations from
8-kHz mono voice playback to stereo 192-kHz DAC playback, making it ideal for portable
battery-powered audio and telephony applications.
The record path of the TLV320AIC3212 covers operations from 8-kHz mono to 192-kHz stereo
recording, and contains programmable input channel configurations which cover single-ended and
differential setups, as well as floating or mixing input signals. It also provides a
digitally-controlled stereo microphone preamplifier and integrated microphone bias. One application
of the digital signal processing blocks is removable of audible noise that may be introduced by
mechanical coupling, for example, optical zooming in a digital camera. The record path can also be
configured as a stereo digital microphone Pulse Density Modulation (PDM) interface typically used
at 64 Fs or 128 Fs.
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 DirectPath
headphone output drivers which eliminate the need for ac coupling capacitors. A built in charge
pump generates the negative supply for the ground centered headphone drivers. 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
The integrated PowerTune technology allows the device to be tuned to just the right
power-performance trade-off. Mobile applications frequently have multiple use cases requiring very
low-power operation while being used in a mobile environment. When used in a docked environment
power consumption typically is less of a concern while lowest possible noise is important. With
PowerTune the TLV320AIC3212 can address both cases.
The required internal clock of the TLV320AIC3212 can be derived from multiple sources,
including the MCLK1 pin, the MCLK2 pin, the BCLK1 pin, the BCLK2 pin, several general purpose I/O
pins or the output of the internal PLL, where the input to the PLL again can be derived from
similar pins. Although using the internal fractional PLL ensures the availability of a suitable
clock signal, TI does not recommend this for the lowest power settings. The PLL is highly
programmable and can accept available input clocks in the range of 512 kHz to 50 MHz. To enable
even lower clock frequencies, an integrated low-frequency clock multiplier can also be used as an
input to the PLL.
The TLV320AIC3212 has a 12-bit SAR ADC converter that supports system voltage
measurements. These system voltage measurements can be sourced from three dedicated analog inputs
(IN1L/AUX1, IN1R/AUX2, or VBAT pins), or, alternatively, an on-chip temperature sensor that can be
read by the SAR ADC.
The TLV320AIC3212 also features three full Digital Audio Serial Interfaces, each
supporting I2S, DSP/TDM, RJF, LJF, and mono PCM formats. This enables the digital playback (DAC)
and record (ADC) paths to select from three independent digital audio buses or chips.
The device is available in the 4.81 mm × 4.81 mm × 0.625 mm 81-Ball WCSP (YZF) package.
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