M2TECH EVO DAC Manuel d'utilisateur télécharger pdf (Page 2)

HIFACE EVO

USING I

S OUTPUT

REVISION PrB - OCTOBER 2010

M2Tech

www.m2tech.biz

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the M2Tech standard

warranty. Production processing does not necessarily include testing of all

parameters.

input compatibility, such as the SN74HCT125

by Texas Instruments (Fig. 3).

SINGLE-ENDED TO DIFFERENTIAL

CONVERSION (TTL OR CMOS)

Some D/A converters accept differential

signals on their I

S input (such as NorthStar

Design units). In this case, no simple level

translation (even if a level translation can be

necessary, too) can accommodate the D/A

converter’s input requirement. A format

conversion is necessary. It can be performed

using a inverting/non inverting buffer pair in

order to achieve an inverted copy of each

signal to drive a line in a balanced fashion

(Fig. 4). The non-inverting buffer is necessary

to introduce a small delay on the original

signal to match (not perfectly, but to a

satisfactory extent) that introduced by the

inverting buffer. For non-inverting buffers, go

for the usual SN74HCT125 (for 3.3V to 5V

translation) or the SN74LVC125 (no level

translation). Inversion and buffering can be

obtained by simply using four units of an hex

inverter such as TI’s SN74HCT04 (level

translation) or SN74LVC04 (no level

translation).

SINGLE-ENDED to LVDS (HDMI)

CONVERSION

Some D/A converters (such as PS Audio

PWD) accept LVDS signals on an HDMI

connector. To perform a single-ended to

LVDS conversion, National’s DS90C031B

can be used (Fig. 5). It is a quad LVDS driver

with TTL input compatibility which can be

directly coupled to hiFace Evo’s output.

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M2TECH EVO DAC Manuel d'utilisateur Page 2

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