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DEVICE INFORMATION

ACCEPTABLE BIPHASE INPUT SIGNAL AND BIPHASE INPUT PIN (RXIN)

DIR9001-Q1

SLLS843A – JUNE 2007 – REVISED FEBRUARY 2008

The DIR9001-Q1 can decode the biphase signal format which is specified in one of the following standards.

Generally, these following standards may be called Sony/Philips digital interface format (S/PDIF) or AES/EBU.

• IEC60958 (revised edition of former IEC958)

• JEITA CPR-1205 (revised edition of former EIAJ CP-1201, CP-340)

• AES3

• EBU tech3250

The sampling frequency range and data word length which DIR9001-Q1 can decode is as follows:

• Sampling frequency range is 28 kHz to 108 kHz.

• Maximum audio sample word length is 24-bit.

Note of others about the biphase input signal.

• The capture ratio of the built-in PLL complies with level III of sampling frequency accuracy (12.5%), which is

specified in IEC60958-3.

• The jitter tolerance of the DIR9001-Q1 complies with IEC60958-3.

• The PLL may also lock in outside of the specified sampling-frequency range, but extended range is not

assured.

Notice about the signal level and transmission line of the biphase input signal.

• The signal level and the transmission line (optical, differential, single-ended) are different in each standard.

• The biphase input signal is connected to the RXIN pin of the DIR9001-Q1.

• The RXIN pin has a 5-V tolerant TTL-level input.

• An optical receiver module (optical to electric converter) such as TOSLINK, which is generally used in

consumer applications, is connected directly to the RXIN pin without added external components.

• The output waveform of the optical receiver module varies depending on the characteristics of each product

type, so a dumping resistor or buffer amplifier might be required between the optical receiver module output

and the DIR9001-Q1 input. Careful handling is required if the optical receiver module and the DIR9001-Q1

are separated by a long distance.

• The DIR9001-Q1 needs an external amplifier if it is connected to a coaxial transmission line.

• The DIR9001-Q1 needs an external differential to single-ended converter, attenuator, etc., for general

consumer applications if non-optical transmission line is used.

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