DMM100 DMM100-BAT
DMM104 DMM104-BAT
AES/EBU DIGITAL AUDIO
OPERATING AND MAINTENANCE MANUAL
© Copyright 1997-2005, Audio Technologies Incorporated - Printed in USA
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www.
audio.com
DESCRIPTION
The DMM100 is a level, impedance and connector matcher. AES/EBU digital
signals share the same general data format regardless of the mode of
transmission. A consumer device is most likely to output a S/PDIF signal in which
a few bits of the data stream indicate whether the signal source is an original or a
first generation copy in order to control unauthorized large scale duplication. A
professional device may indicate whether the encoded audio is a stereo signal or
two monaural channels. The DMM100 doesn’t care about any of these details
and just tries to output a clean copy of the original data stream to the smart
boxes that do.
You may find it necessary to run a low level RCA type (S/PDIF) digital output a
long distance in a high noise environment where a balanced XLR high-level
connection would be a better choice. Or you may run that high level XLR
balanced 110-ohm line smack dab against a 75 ohm BNC socket. Or that nice
piece of pro-sumer gear only comes with a strange digital spigot that blinks at
you (TOSLINK. optical). For all these minor tears in the fabric of creation we offer
you the DMM100 Digital Matchmaker and we offer personal thanks to all those
designers who managed to create four incompatible ways to do the same job.
PERFORMANCE
The DMM100 accepts AES/EBU digital audio signals from an XLR female 110ohm line, a BNC or RCA 75 ohm line or a Toslink optical fiber. Electrical inputs
as low as .10Vp-p and optical inputs corresponding to a maximum plastic fiber
cable length of 10 meters are properly detected and reshaped.
The DMM100 provides a signal bandwidth of 12MHz to handle digital audio
sampling rates of 27 to 96kHz.
The DMM100 simultaneously drives an XLR male 110-ohm output at 3.5Vp-p
and a BNC or RCA 75ohm output at 1.0Vp-p and a Toslink optical transmitter.
Propagation delay through the DMM100 is less than 100nS and jitter is under
5nSp-p.
All electrical inputs and outputs are transformer isolated, floating and DC blocked
to eliminate ground loop hum and jitter and to prevent transformer saturation due
to accidental superimposed DC line voltages. All inputs and outputs are properly
terminated for minimum signal reflection.
A green Signal Present indicator illuminates when a data carrier is output from
the DMM100.
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www.
audio.com
POWER
The DMM100 operates from an external 24VDC power module and draws up to
.1A. Loop-thru DC connectors allow multiple DMM100 to operate from a single
power module. Allow one power module for every three one-rack spaces. Use
power modules WA100-1, -2 or -2E and loop-thru cables 20602-1.
The DMM100-BAT can operate from either four AA batteries in cover-mounted
holders or an external 24VDC power module. Fresh alkaline batteries will provide
a minimum of 40 hours operation. Toslink optical drivers can be disabled with an
internal jumper plug (JP1) to increase battery life by 50%. Batteries are cut off by
external power and can be used as an automatically switched backup power
source.
A front panel POWER switch and indicator are provided.
SIZE in (cm) 1.72(4.45) H X 5.75 (14.6) W X 6.0(15.2) D; 1.5lbs, .7Kg net
weight can be mounted up to three across in one vertical 1 ¾” rack
space using accessory rack mount kits. Stacking and angled desk
mount kits and field carry bags also available.
POWER SUPPLIES The DMM100 requires a 24VDC power supply, which
is ordered separately.
WA100-1 Wall mount power supply (UL, CSA), 24VDC at .4A output,
115VAC/60Hz, and 16VA input.
WA100-2 Tabletop supply, IEC320 AC connector, 24VDC at .4A output
230VAC/50Hz, 16VA input.
WA100-2E Euro plug wall mount supply (CE, VDE), 24VDC at .4A output
230VAC/50Hz, 16VA input.
20602-1 Loop-thru DC interconnect cable, 13” long.
RACK MOUNT KITS
20604-501 Center mount for single unit.
20604-502 Side-by-side mount for two units
20604-503 Side-by-side mount for three units
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www.
audio.com
DESK MOUNT KITS
20617-501 Angled desk mount base.
20617-502 Angled desk mount base and one stacker
20617-503 Angled desk mount base and two stackers
FIELD ACCESSORIES
PROK-1 Protection kit consists of a set of rugged side plates, which protect
front panel controls and rear connectors from impact damage. Side
plates also allow attachment of a carry strap (not included).
ABAG-1 Slide brackets mount PPA, DCA or BBU power modules and allow
quick interchange. Carry case with shoulder strap houses DMM
products with power modules, attaches to PROK-1 (included).
Allows easy access to battery holders.
NOTES: TOSLINK Interconnect cables up to several feet long are available
separately.
Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www.
audio.com
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