TLV320 AIC23 audio ADC/DAC

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TLV320 AIC23 audio ADC/DAC [Copy link]

TLV320 AIC23 is a high-performance stereo audio A/D, D/A amplifier circuit from TI. The analog-to-digital conversion and digital-to-analog conversion components of AIC23 are highly integrated inside the chip, and advanced oversampling technology is adopted. The external hardware interface of AIC23 is divided into analog port and digital port. The analog port is used to input and output audio signals, and supports line input and microphone input; there are two sets of digital interfaces, one of which is a digital control interface composed of /CS, SDIN, SCLK and MODE. AIC23 is a programmable audio chip. The control words of the chip are written into the registers inside AIC23 through the digital control port, such as sampling rate setting, working mode setting, etc. There are 12 registers in total. The communication between the audio control port and DSP is mainly realized by the multi-channel buffered serial port McBSP1. AIC23 completes data communication with DSP's McBSP0 through the digital audio port. DSP acts as the host and AIC23 acts as the slave. The host provides the sending clock signal BCLKX0 and the sending frame synchronization signal BFSX0. In this working mode, the receiving timing signal BCLKR0 and the receiving frame synchronization signal BFSR0 are actually provided by the host. The digital audio interface of AIC23 supports S (universal audio format) mode and DSP mode (special connection mode with TIDSP). DSP mode is used here. When working in DSP mode, its frame width can be one bit long. Circuit design and wiring are a very important link in the signal acquisition process, and its effect is directly related to the quality of later signal processing. For DSP high-speed devices, the external crystal can reach hundreds of megahertz after being multiplied by the internal PLL. This requires that the signal lines are of equal length and multi-layer circuit boards are drawn to eliminate electromagnetic interference and signal reflection. Under the premise of two-layer boards, the top and bottom layers can be crossed, the width of the power line and the ground line can be widened as much as possible, the power line is "tree-shaped", and the analog area and digital area are separated. Principles such as separation can achieve better results.