ATI Audio DM200 User Manual

Page 3

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RECEIVER

The DM200 handles incoming digital audio at sampling rates from 27kHz to 100kHz. The digital
receiver circuit, U1, a Crystal Semiconductor CS8414, automatically recovers the clock from the
input data and illuminates a yellow LED to indicate the received standard sample rate (Fs) of 32 to
96kHz. The receiver circuit outputs serial data (SDATA), serial clock (SCK) and frame sync
(FSYNC). FSYNC is configured as left/right clock (LRCLK). The receiver master clock output
(MCK) is divided in U3 and becomes MCLK to the D/A converter at 128XFs.

DIGITAL TO ANALOG CONVERTER

U5 is a Crystal Semiconductor CS4334, 96kHz, 24bit DIA Converter. The CS4334 is rated at over
90dB dynamic range and -88dB THD+N ratio (.004%). The CS4334 utilizes the latest one bit,
delta-sigma (or sigma-delta if you are west of the Mississippi) D/A converter technology driving an
ultralinear internal analog low pass filter. The converter does not provide digital de-emphasis.

HEADPHONE DRIVER

A high compliance stereo headphone driver (U9, U10) is controlled by the front panel PHONES
volume control. The headphone amplifier will drive up to 20Vp-p into high impedance phones and
up to 120mAp-p into low impedance phones. The headphone output will provide a comfortable
listening level of I mW at 12 o'clock on the volume control for most headsets. The amplifier is
capable of driving many headsets up to DANGEROUS LEVELS over 120dBSPL. If you can hear
distortion, it's TOO LOUD and can cause PERMANENT HEARING DAMAGE!!! BE
CAREFUL!! Treat your ears with tender loving care and they will follow you anywhere. The
DM200 is designed to drive TRS (Tip-Ring-Sleeve) connected stereo headphones between 32 and
600-ohm impedance. Do not use TS connected mono phones.

LINE OUTPUTS

Analog line level outputs for balanced or unbalanced audio lines of 600 ohms or greater impedance
are available on a two-piece Phoenix type rear connector. Ground sensing output drivers (U7, U8)
allow either the HI or LO output line to be grounded by unbalanced loads. Grounding one side of an
output pair shuts off drive to the grounded line and doubles the output signal on the ungrounded
side, thus maintaining normal circuit operation and gain. Front panel trimpots set the nominal line
output level to +4dBu (1.25V) at 0dB on the line output meter that allows 18dB headroom up to the
peak output level of +22dBu.