PCM3168APAPR datasheet(52/66 Pages) TI1

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PCM3168A

SBAS452A – SEPTEMBER 2008 – REVISED JANUARY 2016

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Typical Application (continued)

10.2.1 Design Requirements

For this design example, use the parameters listed in Table 31.

Table 31. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

PCM audio, differential analog

Audio input

audio

PCM audio, differential analog

Audio output

audio

Control

I2C, SPI

10.2.2 Detailed Design Procedure

10.2.2.1 Analog Input and Output

It is recommended that input and output filters be used to condition the inputs and outputs. Input filters can be

used to convert a single ended signal into a differential signal while also attenuating out of band noise. Another

use of an input filter for the ADC it to reduce a 2-VRMS signal to a 1-VRMS input, which is the limit of the ADC

input. Output filters can be used to go from differential to single ended, while reducing a differential signal that is

8 VPP to a 2-VRMS signal. The output filter can also attenuate out of band noise.

10.2.2.2 PCM Interface

The PCM3168A has the capability of inputting 8 PCM channels over 4 data pins in normal PCM mode, or can

operate in TDM mode to take in 8 channels on one data pin. The PCM3168A can also output up to 6 PCM

channels over 3 data pins, or over 1 pin in TDM mode.

10.2.3 Application Curves

–1 dB, N = 32768

0 dB, N = 32768

Figure 55. ADC Output Spectrum

Figure 56. DAC Output Spectrum

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