Manual

KTD-S0051-D Page 25 Audio Interface

KTAM3874/pITX User's Guide

11 Audio Interface

The SoC supports an Inter-IC Sound (I

S) codec with 24 bit resolution and 96 kHz sample rate (the

maximum rate of 96 kHz only unidirectional). The analogue-to-digital part of the codec uses 24 bit, 128x

oversampled sigma-delta ADCs. The digital-to-analogue part contains two 24 bit sigma-delta DACs. The

interface includes LINE OUT, LINE IN and MICROPHONE IN. From the six SoC audio serial ports the third port

is used (McASP 2).

11.1 Audio Hardware Features

Parameter Values Units

Output resolution (LINE OUT) 16/20/24 bit

Output sample rate (LINE OUT) 44.1/48/96 kHz

Output signal-to-noise ratio (LINE OUT) 96 dB

Input resolution (LINE IN) 16/20/24 bit

Input sample rate (LINE IN) 44.1/48/96 kHz

Input signal-to-noise ratio (LINE IN) 92 dB

11.2 Analog Connector

The analog audio interface uses the connector J800 (6 pins). A prototype adapter cable (open ended) is

deliverable (KAB-SOUND-CMP-2, part number 96063-0000-00-1).

Header Pin Signal Description Type

1 LINE_IN_L Line input left AI

2 MIC_IN Microphone input AI

3 LINE_IN_R Line input right AI

4 LINE_OUT_L Line output left AO

5 GND Ground PWR

6 LINE_OUT_R Line output right AO

11.3 Speaker Connector

The audio codec also supports a speaker driver interface. With both speaker drivers it is possible to realize a

passive stereo loudspeaker system. The drivers have a thermal shutdown feature. If the junction tempe-

rature exceeds approximately 150

C then the output will be disabled. The speaker interface is available

through the connector J801 (4 pins).