ADC ADDC1 instruction manual Digital Outputs, AES/EBU XLR Output, Optical Output

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Digital Outputs

The ADC1 has four digital audio outputs: three Main Outputs and one Aux Output.

Main Outputs

•XLR connector, balanced, AES/EBU professional format, 24-bits

•BNC connector, un-balanced, AES/EBU professional format, 24-bits, compatible with most SPDIF inputs

•Optical TOSLINK connector, multi-format (AES professional, ADAT, ADAT S/MUX II & IV), 24-bits

Aux Output

•BNC connector, AES Professional format, 16 or 24-bits

All of the outputs are controlled by the front- panel Mode Switch. The status of these outputs is shown in the Mode Display adjacent to the Mode Switch.

Three of the outputs are Main Outputs and always operate at 24-bits. The Main Outputs may be synchronized to an external clock reference or may be controlled by the internal clock. The Optical Output has two modes of operation; AES/EBU and ADAT. The ADAT mode supports ADAT (44.1 and 48 kHz), ADAT S/MUX2 (88.2 and 96 kHz), and ADAT S/MUX4 (176.4 and 192 kHz).

The Aux Output can operate asynchronously at 44.1 or 48 kHz with a TPDF-dithered 16-bit word length. The Aux Output is provided as a convenience for making safety backups or demo recordings to low-resolution 16-bit recorders (i.e. CDR or DAT). If this low- resolution function is not needed, the Aux Output can be set to mirror the high- resolution Main Outputs.

AES/EBU XLR Output

This output uses a gold-pin Neutrik™ male XLR connector. The output is balanced and has an output impedance of 110 Ohms. This output is DC-isolated, transformer-coupled, current-limited, and diode-protected. It is

ADC1 Instruction Manual

designed to drive standard 4 Vpp AES signals into a 110 Ohm load. Use 110 Ohm digital cable when connecting this output to other devices. The use of analog audio cables may cause data transmission errors.

•Data Format = AES/EBU professional format

•Word Length = 24 bits

•Sample Rate = 44.1, 48, 88.2, 96, 176.4, or 192 kHz

•Clock Source = Internal or external

Optical Output

The Optical Output has four modes of operation; AES/EBU, ADAT, ADAT S/MUX2, and ADAT S/MUX4. The ADAT LED on the front panel is illuminated whenever any of the ADAT Modes are active. S/MUX2 and S/MUX4 are automatically enabled if required to support the selected sample rate. S/MUX2 is active at 88.2 or 96 kHz, S/MUX4 is active at 176.4 or 192 kHz.

The Optical Output uses what is often called a TOSLINK, Type FO5, or 5 mm optical connector. The ADC1 uses a special high- bandwidth version that supports AES/EBU digital audio at sample rates up to 192 kHz. Please note that many optical inputs cannot support AES/EBU or SPDIF digital audio at sample rates above 48 kHz, others are limited to 96 kHz. A few products (such as the Benchmark DAC1) support 192 kHz optical inputs. Please note that high-bandwidth optical transmitters and receivers are not required for ADAT, ADAT S/MUX2, or even ADAT S/MUX4.

AES/EBU Optical Output Mode

•Data Format = AES/EBU professional format

•Word Length = 24 bits

•Sample Rate = 44.1, 48, 88.2, 96, 176.4, or 192 kHz

•Clock Source = Internal or external

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Contents Benchmark ADC1 Channel 24-bit 192-kHz Audio Analog-to-Digital ConverterSafety Information Federal Communications Commission FCC Notice OnlyContents Overview Page Features Connections Balanced Analog Line InputsClock Reference Input To adapt to unbalanced sourcesOptical Output Digital OutputsAES/EBU XLR Output Adat Optical Output Mode Adat S/MUX2 Optical Output ModeAdat S/MUX4 Optical Output Mode SPDIF/AES BNC Main and Aux OutputsFuse Holder AC Power Entry ConnectorWord Clock Reference Output Mode Switch and Display To program the conversion modeOperation Programming the OutputsSelecting a Fixed Frequency Using the Internal Clock Source Reading Sample Rates off of the Mode DisplayTo synchronize with an external clock source To select a fixed sample frequency on the Main OutputsResetting the ADC1 to Factory Default Settings Programming the Aux OutputAdat or AES/EBU on the Optical Output Meter DisplaySecond Stage Gain Controls Adjusting Input GainFirst Stage Gain Rack Mounting Using Adat S/MUX Proper S/MUX Identification is a MustSample Rate is the Key that Controls S/MUX MUX should not be used for Sample Rate ConversionUltraLock … What is It? Problem #1 Put UltraLock converters to the testWhat UltraLock converters cannot do Performance Frequency ResponseInter-Channel Phase Response KHz LPF unweighted THD+N vs. Level, 1 KHz32K B-H FFT, Idle Channel Noise 32K B-H FFT, -3 dBFS, 1 KHz 32K B-H FFT, -3 dBFS, 10 KHz Worldclock Reference Output SpecificationsAnalog Audio Inputs Digital Audio Outputs Audio Performance Group Delay Latency LED Status IndicatorsWeight AC Power RequirementsDimensions Page Warranty Information Benchmark 1 Year WarrantyBenchmark Extended 5* Year Warranty Benchmark Extended WarrantyBenchmark Media Systems, Inc
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