TAS3001CPWR datasheet(31/56 Pages) TI

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7−1

7 Measured Audio Performance for Some Typical Examples

To illustrate the performance of the TAS3001, a series of measurements was performed on a system shown in

Figure 7−1.

Measurement

System

TAS3001

S/PDIF

Transmitter

S/PDIF

Receiver

Control

Interface

TAS3001 Test System

Figure 7−1. Audio Performance Measurement System

The system performance was measured for three filter types at 48 kHz.

•

Butterworth high-pass filter at 1 kHz

•

Butterworth low-pass filter at 1 kHz

•

EQ filter at 1 kHz with a gain of 8 dB and a bandwidth of 500 Hz

The audio performance that was measured is shown in Table 7−1. The response shapes of the three test filters are

shown in Figure 7−2.

Table 7−1. Audio Filter Performance

PARAMETER

FILTER

CONDITIONS

MEASURED

All-pass

Vol = 0, mixer –0 dB, 48-kHz fs

< −110 dB

< 0.0003%

THD+N

1-kHz second-order Butterworth high- and low-pass filters

Vol = 0, mixer –0 dB, 48-kHz fs

< −106 dB

< 0.0005%

1-kHz EQ +8 dB, 500-Hz bandwidth

Vol = 0, mixer –8 dB, 48 kHz fs

< −108 dB

< 0.0004%

SNR

All filters

> 110 dB

All filters

< −98 dB

< 0.001%

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