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ADC16 Instruction Manual – Rev A Page 18

Optical Digital Audio Outputs

The ADC16 features eight optical digital

outputs. These outputs can be operated in

four different modes: 'S/PDIF', 'ADAT', 'ADAT

S/MUX

2

', and 'ADAT S/MUX

4

'. The 'FORMAT'

button on the front panel toggles between

'S/PDIF' and 'ADAT' formats. If any ADAT

mode is selected, S/MUX

2

, or S/MUX

4

will be

enabled automatically depending upon the

system sample rate.

In 'S/PDIF' mode, each optical connector

carries two audio channels. Data format is

AES professional. The optical transmitters on

the ADC16 support a maximum sample rate

of 200 kHz in 'S/PDIF' mode . However, most

optical inputs do not support S/PDIF or AES

formats at high sample rates. Check the

specifications on connected equipment before

relying on high sample-rate optical

connections.

In 'ADAT' mode, each optical carries eight

channels of digital audio. In this mode, two

optical connectors are required to carry all 16

channels produced by the ADC16. The

remaining 6 optical connectors provide two

additional sets of outputs. 'ADAT' mode is

only available at sample rates between 28

and 50 kHz. If a higher sample rate is

selected, 'S/MUX

2

' or 'S/MUX

4

' is

automatically enabled.

ADAT 'S/MUX

2

' is available at sample rates

between 75 and 100 kHz. In this mode, each

optical output carries four channels of audio.

Four connectors are required for 16 channels

of audio. The 8 optical connectors on the

ADC16 carry two identical sets of data when

operating in ADAT 'S/MUX

2

'.

ADAT 'S/MUX

4

' is available at sample rates

between 150 and 200 kHz. In this mode,

each optical output carries two channels of

digital audio. All 8 optical connectors are

required, to carry 16-channels of audio.

The optical outputs use what is often called a

TOSLINK, Type FO5, or 5 mm optical

connector. The ADC16 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. Some 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/MUX

2

, or even

ADAT S/MUX

4

.

AES/EBU 'S/PDIF' Optical Mode

 Data Format = AES/EBU professional

 Word Length = 24 bits

 Sample Rates = 28 - 50 kHz, 75 - 100

kHz, and 150 - 200 kHz

 Clock Source = Internal or External

 Data Source = A/D or DAW

ADAT Optical Output Mode

 Data Format = ADAT

 Word Length = 24 bits

 Sample Rates = 28 to 50 kHz

 Clock Source = Internal or External

 Data Source = A/D or DAW

ADAT S/MUX

2

Optical Output

Mode

 Data Format = ADAT

 Word Length = 24 bits

 Sample Rate = 75 to 100 kHz

 Clock Source = Internal or External

 Data Source = A/D or DAW

ADAT S/MUX

4

Optical Output

Mode

 Data Format = ADAT

 Word Length = 24 bits

 Sample Rate = 150 to 200 kHz

 Clock Source = Internal or External

 Data Source = A/D or DAW

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