Specifications

Selecting the DIG Position
The last position counter-clockwise is the DIG position. When selected, an AES or S/PDIF signal (input via the
top BNC connector on the back of the AD-1000) or S/PDIF optical signal (via the Toslink input connector) can
be re-clocked and formatted into various digital outputs. This allows AES or S/PDIF conversion to ADAT and
other useful format conversions. In this mode, the SAMPLE RATE cannot be selected and must remain in the 6
o’clock position. The sample rate of the digital output will be identical to the input, within a range of 32kHz to
54kHz. The format of the input is selected by the SYNC SOURCE selector. AES, Terminated and Bridged, as well
as S/PDIF coaxial, terminated and bridged and Optical are supported. ADAT can also be reformatted and
selected when the Hi-Resolution Option (AD1K-PRT) is installed.
See the Options & Enhancements section for
further information on these options
.
To Input Digital Audio:
1. Connect your digital audio source to the AD-1000 to the top BNC connector on the back of the AD-1000 for
AES/EBU* or S/PDIF operation. Optical input is available via the TOSLINK connector on the back of the AD-
1000.
* NOTE: A special cable (Apogee part # WE-BX-0.5FT) is required to interface an AES/EBU XLR cable to the
BNC connector.
2. Set the INPUT SELECTOR to the DIG position.
3. Set the SYNC SOURCE to 110 Ω AES, SPDIF, or OPT (depending on type of digital audio source).
NOTES:
• S/PDIF must be terminated with 75 Ω, either by setting DIP switch 1 (located on top of the AD-1000) to ON
or a 75Ω BNC termination (supplied with the AD-1000) can be connected to the unused BNC connector
(making sure not to double terminate). Termination on the AD-1000 is not necessary if looping to another
device, as the last device in the chain is then terminated.
• Two AES positions are available. The position labeled 110 Ω AES terminates the input with a 110 Ω imped-
ance. The AES position with the ^ above it signifies a bridged input of 5 kΩ for the AES. This position would
be used if the AD-1000 was
not the last device in the chain.
4. Set SAMPLE RATE to the 6 o’clock position (the unmarked position - straight down).
Note: The 1.001 “gearbox” functions are not available with digital inputs.
5. Set the THREE POSITION SWITCH (located between the Sync Source and Sample Rate selectors) to either
16, UV16 or 20 as desired.
When inputting a 20 bit signal:
• the 20 position outputs 20 bits with no processing.
• the UV16 position outputs 16 bits*
• the 16 position outputs 16 bits with triangular dither.
When inputting a 16 bit signal:
• the 20 position outputs 16 bits unprocessed (whatever signal is input).
• the UV16 position outputs 16 bits*
• the 16 position output 16 bits with triangular dither.
*Note: UV22 is not available on a digital input unless a special option AD1K-UV22 is installed. See page 35 for
operation of this option.
6. NORM / ADAT Switch: Selecting ADAT transmits the ADAT output on the Optical digital output.
When NORM is selected, the AD-1000 simultaneously outputs AES/EBU (Male XLR) and S/PDIF in optical and
coaxial formats.
AD-1000 Operating Manual
Page 22