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Introduction—PCM3793A/94A

1.1Introduction—PCM3793A/94A

The PCM3793A/94A is a low-power stereo codec designed for portable digital audio applications. The device integrates a stereo digital speaker amplifier, headphone amplifier, line amplifier, line input, boost amplifier, microphone bias, programmable gain control, analog mixing, sound effects, and automatic level control (ALC) features. (The PCM3794A has no speaker amplifiers.)

It is available in a 5 × 5 QFN package to reduce the overall device footprint. The PCM3793A/94A accepts Right-Justified, Left-Justified, I2S™, and digital signal processing (DSP) formats, providing an easy interface to audio DSPs, as well as decoders and encoder chips. Sampling rates up to 50kHz are supported. The user-programmable functions are accessible through a two- or three-wire serial control port.

1.1.1 Key Features

Major features of the PCM3793A/94A include:

Analog Front End:

Stereo single-ended input with multiplexer (mux)

Mono differential input

Stereo programmable gain amplifier (PGA)

Microphone amplifier (20dB) and bias

Analog Back End:

Stereo/Mono line output with volume

Stereo/Mono headphone amplifier with volume and capless mode

Stereo/Mono digital speaker amplifier (BTL) with volume

Analog Performance:

Dynamic range: 93dB (digital-to-audio converter [DAC])

Dynamic range: 90dB (analog-to-digital converter [ADC])

40mW + 40mW headphone output at RL = 16Ω

700mW + 700mW speaker output at RL = 8Ω

Power Supply Voltage

1.71V to 3.6V for digital I/O section

1.71V to 3.6V for digital core section

2.4V to 3.6V for analog section

2.4V to 3.6V for power amplifier section

Low Power Dissipation:

7mW in playback, 1.8V/2.4V, 48kHz

13mW in record, 1.8V/2.4V, 48kHz

3.3μW in power-down

Sampling Frequency: 5kHz to 50kHz

Automatic Level Control for Recording

Operation From a Single Clock Input without PLL

System Clock:

Common-audio clock (256fS/384fS), 12MHz/24MHz, 13MHz/26MHz, 13.5MHz/27MHz, 19.2MHz/38.4MHz, 19.68MHz/39.36MHz

Headphone Plug Insert Detection

I2C™ or SPI™ Serial Control

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Description

SBAU127 –July 2007

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Texas Instruments DEM-DAI3793A manual Introduction-PCM3793A/94A, Key Features

DEM-DAI3793A specifications

The Texas Instruments DEM-DAI3793A is a versatile digital-to-analog converter (DAC) evaluation module designed for assessing the performance and capabilities of TI's DACs in various applications. This module features the high-performance DAC3793, which is widely recognized for its precision and flexibility, making it an ideal choice for audio, industrial automation, and communication systems.

One of the standout features of the DEM-DAI3793A is its ability to support a 16-bit resolution. This high resolution enables the module to provide fine granularity in signal representation, ensuring that even the most subtle changes in the input signal are accurately reflected in the output. The DAC3793 also boasts a high sampling rate, which is crucial for applications that require rapid signal processing and real-time data conversion.

The module incorporates advanced technologies such as dynamic element matching and integrated circuitry to minimize distortion and noise. These technologies are crucial for achieving high-fidelity audio playback and improving overall system performance. Additionally, the DEM-DAI3793A is designed to minimize power consumption while maintaining exceptional performance levels, making it suitable for battery-operated devices and energy-conscious applications.

Another significant characteristic of the DEM-DAI3793A is its ease of integration with various development environments. The evaluation module supports both hardware and software interfacing, allowing engineers to quickly prototype and test their designs. It comes equipped with a USB interface for seamless connectivity with computers, along with supporting software tools that facilitate the configuration and testing of the DAC's functionalities.

The DEM-DAI3793A is also designed with a robust set of output options, including differential and single-ended outputs. This flexibility allows for compatibility with a wide range of amplification and filtering circuits. Furthermore, the evaluation module is equipped with convenient power supply options, enabling it to operate in various settings without the need for extensive modifications.

In conclusion, the Texas Instruments DEM-DAI3793A is an exceptional evaluation module that showcases the capabilities of the DAC3793. With its high resolution, advanced technologies, ease of integration, and flexible output options, it serves as an indispensable tool for engineers and developers working on high-performance audio and data processing applications.