D8202 — AES/EBU Digital To Analog Converter

DIGITAL INPUT

Input Impedance Selectable 75Ω, 110Ω, and Hi (Transformer balanced) Input Level 0.2-7 V p-p Sampling Frequency Range 30 kHz to 50 kHz Equalization 2000 ft twisted pair 110Ω digital audio cable 5000 ft 75Ω coaxial cable Conversion 24 bit

ANALOG OUTPUT

Frequency Response ± 0.3 dB, 20Hz to 20kHz Noise less than 84 dBu, 20Hz to 20kHz THD+Noise less than 0.005 %, 20Hz to 20kHz @ +24 dBu Stereo Separation greater than 80 dB, 20Hz to 20kHz Output Impedance 60 Ohm balanced Maximum Output Level +24 dBu into 600 Ohm

GENERAL

O.C. Outputs 10 Ohm 60 mA MAX 30 V MAX Power Requirements +20 V, 177 mA, MAX - 20 V, 150 mA, MAX Dimensions approx. 1" wide x 2.75" high x 10.06" deep (25.4 mm x 70 mm x 270 mm) Weight approx. 0.262 lbs (119 grams)

D8202 Terminal Options

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4124325152400 Input Termination

The input impedance of the D8202 is jumper selectable for 110 Ohm, or 75 Ohm. Unless specified otherwise, the unit is shipped with the input impedance jumper set for 110Ω. To change the input impedance please refer to Fig. 1.1 The two position Berg header labelled INPUT TERMINATION is marked 110, 75 and HiZ. Ensure that the transmission line is properly terminated to avoid reflections due to impedance mismatches.-76198685800

Output Analog Audio Level

The D8202 provides three balanced stereo outputs or two balanced stereo outputs and two summed (L+R) mono outputs. The output level of the left and right channels may be adjusted separately; please refer to Fig 1.2. for the location of the trim controls. Place the Berg jumper in the appropriate position and using the trim potentiometer, adjust the analog output to the nominal plant level, eg. +4dBu. Unless otherwise specified, the D8202 is factory set with a nominal -20 dBFS digital input signal for a +4dBu analog output level. Mono Outputs 4048125114300 The third stereo output of the D8202 may be configured to provide two summed (L+R) mono outputs. Two three pin Berg headers are provided for programming the left and right channels of stereo output 3. Please refer to Fig 1.3. The jumpers are normally in positions 1,2 for stereo. To provide two mono outputs, place both programming jumpers in the 2,3 position. Please note that adjusting the left and right trim controls will affect mono outputs one and two respectively.

Equalization

For most applications, the D8202 only requires installation in the appropriate mounting frame and connection of input and output wiring. Factory calibrated, the D8202 can recover digital audio signals conforming to AES/EBU specifications and transmitted over 110Ω, shielded twisted pair cable up to 250 metres (750 ft) long. For cables lengths in excess of 250 metres we recommend that the input equalization be activated.

To activate the cable equalization, simply press the button located on the front edge of the card. The green LED located on the bottom of the LED array will illuminate to indicate that cable equalization is activated. NOTE: In installations with consistently long digital audio runs, consideration should be given to using 75 Ohm coaxial cable.

External Alarms

The controls that trigger two LED status indicators on the front edge of the amplifier’s card, CONFIDENCE (yellow) and NO LOCK (red), are brought out via the rear connector to activate external alarms. These controls are open collector outputs.

STATUS TALLIES AND MONITOR Status

The D8202 is equipped with four LED status tallies located on the front edge of the card, above the handle. The function of these tallies are:

GREEN LED LOCK - Indicates that the receiver is locked to the incoming AES/EBU signal. YELLOW LED CONFIDENCE - Indicates an eye pattern violation. It is a warning that the incoming signal is approaching the limits beyond which reliable recovery may be jeopardized. This is typically caused by the band limiting effects of long cable runs. To eliminate confidence errors, it may be necessary to activate the equalizer and adjust the gain in order to optimize the performance of the receiver. RED LED NO LOCK - Indicates that the receiver cannot lock to the incoming signal. This may mean that there is no signal or the signal is beyond the recoverable range of the receiver and may require equalization. GREEN LED EQUALIZER - Indicates that the cable equalization has been enabled.

Monitor A digital output is provided on a ¼ inch jack located on the front edge of the card, below the handle. This output may be used to monitor the AES/EBU signal, using a WBS Audio Bit Buddy™ or POD 11, or as a "quick patch point" to route the signal to another destination

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