Tascam Digital Interface

The Tascam Digital Interface^[1] (TDIF) is a proprietary format connector defined by TASCAM that is unbalanced and uses a 25-pin D-sub cable to transmit and/or receive up to eight channels of digital audio between compatible devices. Unlike the ADAT lightpipe connection, TDIF uses a bidirectional connection, meaning that only one cable is required to connect the eight ins and outs of one device or another.

The Initial specification available to implementers was called TDIF-1 Version 1.0.

The first product with this connector was the TASCAM DA-88. That implementation did not include the ability to derive a word clock synchronization between the DA-88 and another TDIF-1 device, so a BNC WORD CLOCK connection was required as well.(cite: DA-88 users manual) Later TASCAM products included the ability to sync to the TDIF-1 connection, although that still excluded the DA-88. (cite:DA-38 users manual). Other manufacturers vary in their completeness of implementation.^[2]

The signal labelled "word clock" in the TDIF-1 spec is delayed 270 degrees (90 degrees advanced) with respect to the word clock visible from the BNC word clock output. This is because the TDIF-1 spec was derived from the digital audio transmitter of the NEC uPD6381 DSP used in the DA-88.

The TDIF-1 Version 1.1 specification includes parity and other channel information bits. TDIF-1 Version 2.0 includes specification for double speed and quad speed (e.g. 96 kHz and 192 kHz) rates at reduced channel counts.^[3]

The TASCAM X-48 supports 96 kHz at full channel count over 6 TDIF-1 connectors, using a post Version 2.0 specification.^[4]

Notes

^ Digital Interface Handbook. Taylor & Francis. 2013. p. 215. ISBN 9781136026102.
^ See Mackie D8B FAQ
^ See tascam.com DA-78HR or DA-98HR details
^ See tascam.com X48 webpage

References

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[1] Digital Interface Handbook. Taylor & Francis. 2013. p. 215. ISBN 9781136026102.

[2] See Mackie D8B FAQ

[3] See tascam.com DA-78HR or DA-98HR details

[4] See tascam.com X48 webpage

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