ADC ADDC1 SPDIF/AES BNC Main and Aux Outputs, Adat Optical Output Mode, Main BNC Output

ADAT Optical Output Mode

•Data Format = ADAT

•Word Length = 24 bits

•Sample Rate = 44.1 or 48 kHz

•Clock Source = Internal or external

•ADAT channel assignments: 1 = Left, 2 = Right, 3-8 = muted

ADAT S/MUX2 Optical Output Mode

•Data Format = ADAT

•Word Length = 24 bits

•Sample Rate = 88.2 or 96 kHz

•Clock Source = Internal or external

•ADAT channel assignments *: 1 = Left a,

2 = Left b, 3 = Right a, 4 = Right b, 5-8 = muted

* a, and b are successive samples

ADAT S/MUX4 Optical Output Mode:

•Data Format = ADAT

•Word Length = 24 bits

•Sample Rate = 176.4 or 192 kHz

•Clock Source = Internal or external

•ADAT channel assignments **: 1 = Left a, 2 = Left b, 3 = Left c, 4 = Left d, 5 = Right a, 6 = Right b, 7 = Right c, 8 = Right d

** a, b, c, and d are successive samples

SPDIF/AES BNC Main and Aux Outputs

The two BNC coaxial digital outputs use female BNC connectors. These connectors are securely mounted directly to the rear panel. These are 1 Vpp unbalanced outputs with 75-

Ωsource impedances. Outputs are DC- isolated, transformer-coupled, current- limited, and diode-protected. Use 75 Ohm coaxial cable when connecting these outputs to other devices. The use of 50 Ω coax is not recommended and may cause data transmission errors.

Many customers are more familiar with consumer-style RCA-equipped SPDIF digital

ADC1 Instruction Manual

interfaces. The ADC1 ships with BNC-to-RCA adapters. These adapters allow easy interfacing with consumer-style digital interfaces. BNC to RCA coaxial cords are also available from Benchmark.

BNC connectors are specified by the AES3-id and SMPTE 276M standards for 75-Ω 1 Vpp digital audio signals and are commonly used in video production facilities and other professional audio applications. RCA connectors are specified by IEC 609588-3 for 75-Ω 0.5 Vpp consumer-format digital audio signals (commonly known as SPDIF). We have chosen to comply with the professional standards because the BNC connectors lock and are generally more reliable than RCA connectors. Compliance with the 1 Vpp digital audio standards increases the reliability of digital connections, and often allows increased transmission distances.

Main BNC Output

This digital data at this output is identical to that of the Main XLR Digital Output.

•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

Aux Output

This BNC digital output has two signals available to it. The first is a 16-bit TPDF auxiliary output for use with low-resolution devices. The second signal is the Main digital output and is identical to the data available at the other Main digital outputs.

•Data Format = AES/EBU professional format

•Word Length = 16 bits TPDF dithered, or 24 bits

•Sample Rate = 44.1 or 48 at 16-bits, 44.1, 48, 88.2, 96, 176.4, or 192 kHz at 24-bits

•Clock Source = Internal at 16-bits, internal or external at 24-bits

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