D8203 — Analog To AES/EBU Digital Converter

DIGITAL INPUT

Input Impedance 75 Ohm unbalanced or (jumper selectable) 110 Ohm balanced Input Level 0.2-7 V p-p Sampling Frequency Range 30 kHz to 50kHz

ANALOG AUDIO INPUT

Input Impedance 24 kOhms balanced Maximum Input +26 dBu Frequency Response ± 0.1 dB, 20Hz to 20kHz

DIGITAL OUTPUT

Resolution 24 bits Output Standard (D8203/75) AES/EBU 75 Ohm unbalanced Output Standard (D8203/110) AES/EBU 110 Ohm transformer balanced External Sampling Frequency 30 kHz to 50 kHz Internal Sampling Frequency Selectable 32 kHz, 44.1 kHz and 48 kHz Jitter Less than 5 ns Level 1 V p-p terminated Noise better than -105 dBFs, 20 Hz to 20kHz Total Harmonic Distortion better than 0.01%

GENERAL

Power Requirements +21 V, 95 mA MAX -21 V, 29 mA MAX Dimensions approx. 1" wide x 2.75" high x 11" deep (25.4 mm x 70 mm x 279 mm) Weight approx. 0.116 kg (0.252 lbs)

All the preceding specifications were taken with a 48 kHz external reference. Ward-Beck Systems Inc. reserves the right to change performance specifications without prior notice

Reference Synchronization 4210050161925 As shown in Fig1 (H1 1-3, 2-4 FrameRef, 3-5, 4-6 ExtRef), the D8203 can be jumpered to accept an external (EXT) or Frame (INT) digital reference signal. The external AES digital reference signal is connected to the terminating assembly mounted on the rear of the MF82 frame. Use H4 to select between 110 Ohm and 75 Ohm unbalanced External AES digital reference (use 75 Ohm if local reference is selected). With the jumper set for local reference, the D8203 will pick up an AES reference input from the frame motherboard. The frame reference can be driven from the reference housing (REF IN) on the rear of the frame near the power supply.

Internal Sampling Frequency

The internally generated sampling frequency may be switched between 32kHz, 44.1kHz, and 48kHz by positioning the jumpers for the desired frequency. Please refer to Fig 2. (H2 1-2 32 KHz; 2-3 44.1 KHz; NO JUMPER 48KHz).

Audio Level Calibration

The default factory calibration for the D8203 is 0dBFs = +24 dBu. This allows for operation at a digital output level of -20 dBFs for a nominal +4 dBu analog input signal.

STATUS TALLIES The D8203 is equipped with three LED status tallies located on the front edge of the card above the handle. The function of these tallies are:

GREEN LED EXTERNAL REFERENCE - Indicates that the D8203 is locked to an external AES/EBU reference signal. YELLOW LED INTERNAL REFERENCE - Indicates that the D8203 is generating a reference signal from its internal oscillator. RED LED

Indicates that the D8203 is in self calibrating mode. Initial calibration on power up will take approximately 16 seconds. Subsequent calibration due to switching reference signals will take approximately 2 seconds

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