Wolfson WM8595 24位192kHz多路CODEC方案

首页 » 解决方案 » Wolfson WM8595 24位192kHz多路CODEC方案

Wolfson WM8595 24位192kHz多路CODEC方案

作者：时间：2010-01-27 13:28 来源：

Wolfson 微电子公司的WM8595 是24位192kHz高性能多路音频CODEC,具有灵活的输入/输出选择以及数字与模拟音量控制.主要特性包括数字增益控制的24位立体声ADC,两个独立音量控制和时钟的24位DAC,以及各种输入/输出通路选择, DAC取样频率为32kHz-192kHz, DAC的SNR为100dB,THD为-87dB,而ADC的取样频率为32kHz-96kHz,主要用在平板电视,DVD-RW和STB.本文介绍WM8595主要特性, 方框图,推荐外接元件和模拟低通滤波器电路图以及评估板WM8595-6247-FL48-EV1-REV1 详细电路图和材料清单(BOM):

WM8595: 24-bit 192kHz 2Vrms Multi-Channel CODEC

The WM8595 is a high performance multi-channel audio CODEC with flexible input/output selection and digital and analogue volume control. Features include a 24-bit stereo ADC with digital gain control, two 24-bit DACs with independent volume control and clocking, and a range of input/output channel selection options with analogue volume control for flexible routing within current and future audio systems.

The WM8595 has a six stereo input selector which accepts input levels up to 2Vrms. One stereo input can be selected through an input mux to be routed through to the ADC.

The WM8595 outputs two stereo audio channels at line levels up to 2Vrms, driven from independent DACs. The DAC channels include independent digital volume control, and both stereo output channels include analogue volume control with soft ramp.

The WM8595 supports up to 2Vrms analogue inputs, 2Vrms outputs, with sample rates from 32kHz to 192kHz on the DACs, and 32kHz to 96kHz on the ADC.

The WM8595 is controlled via a serial interface with support for 2-wire and 3-wire control with full readback. Control of mute, emergency shutdown and reset can also be achieved
by pin selection.

The WM8595 is ideal for audio applications requiring high performance and flexible routing options, including flat panel digital TV and DVD recorder. The WM8595 is available in a 48-pin QFN package.

WM8595主要特性:

Multi-channel CODEC with 6 stereo input selector and 2 stereo output selector

4-channel DAC, 2-channel ADC

6x2Vrms stereo input selector to ADC

2x2Vrms stereo output

Audio performance

- DAC: 100dB SNR typical (‘A’ weighted @ 48kHz)

- DAC: -87dB THD typical

- ADC: 96dB SNR typical (‘A’ weighted @ 48kHz)

- ADC: -80dB THD typical

Independent sampling rate for ADC and DACs possible

DACs sampling frequency 32kHz – 192kHz

ADC sampling frequency 32kHz – 96kHz

DAC digital volume control +12dB to -100dB in 0.5dB steps

ADC digital volume control from +30dB to -97dB in 0.5dB steps

ADC input analogue boost control, selectable from 0dB, +3dB, +6dB and +12dB

Output analogue volume control +6dB to -73.5dB in 0.5dB steps with zero cross or soft ramp to prevent pops and clicks

Digital multiplexer to interface to multiple digital sources –DSP, HDMI, memory card

2-wire and 3-wire serial control interface with readback and hardware reset, mute and emergency shutdown pins

ADC features master or slave clocking modes

Programmable format audio data interface modes - I2S, LJ, RJ, DSP

3.3V / 9V analogue, 3.3V digital supply operation

48-pin QFN package

WM8595应用:

Digital Flat Panel TV

DVD-RW

Set Top Boxes

图1.WM8595方框图

图2.WM8595推荐的外接元件连接框图

图3.WM8595推荐的模拟低通滤波器电路图

评估板WM8595-6247-FL48-EV1-REV1 电路图和布局

This evaluation platform and documentation should be used in conjunction with the latest version of the WM8595 datasheet. The datasheet gives device functionality information as well as timing and data format requirements.

This evaluation platform has been designed to allow the user ease of use and give optimum performance in device measurement as well as providing the user with the ability to listen to the excellent audio quality offered by the WM8595.