Ds360 Digital Functions - Stanford Research Systems DS360 Operating Manual And Programming Reference

5-4 Digital Output
The electrical specifications of the AES-EBU interface require that the data is transmitted
as a differential signal over a shielded twisted pair of wire and are compatible with RS-
422. The signal level are specified for a 110Ω source impedance at 2-7 V
impedance of 110Ω. The connector provided on the DS360 is an XLR connector (male
pins, female shell) with the signal on pins 2 and 3 and pin 1 grounded. Any high quality
XLR cable can connect the DS360 to the device under test.
The major difference between the professional format (AES-EBU) and the consumer
format (S/PDIF) is in the definition of the channel status bytes and the number of bits per
word of data. The professional format can support between 16 and 24 bits per word of
data (although the DS360 only supports 16-20 bits). The consumer format only supports
16 bits of data per word.
S/PDIF
The S/PDIF, or Sony-Phillips Digital Interface Format is described in IEC 958 (also EIAJ
CP-340). It is a means of serially transmitting two channels of periodically sampled audio
signals on a single shielded wire or over a fiber-optic link. The transmission rate is such
that both audio channels can be transmitted in one sample period. Error detection is
limited to parity checking and there is a format for transmitting channel status (control)
and user specific information. The control and user specific data is transmitted at the rate
of one bit per sample.
The electrical specifications of the S/PDIF require that the data is transmitted in an
unbalanced configuration with an output impedance of 75Ω and a voltage of 0.5 V
±20% into a 75Ω load, with no cable. The connector provided on the DS360 is an RCA
phono socket. In addition there is an fiber optic connector (Sharp GP1F32T), compatible
with most consumer digital audio fiber optic cables (Sharp GP1C321 type or equivalent).
The major difference between the professional format (AES-EBU) and the consumer
format (S/PDIF) is in the definition of the channel status bytes and the number of bits per
word of data. The professional format can support between 16 and 24 bits per word of
data (the DS360 supports 16-20 bits). The consumer format only supports 16 bits of data
per word.

DS360 Digital Functions

The DS360 is capable of generating sine waves and two sine 2 Tones at sampling rates of
32 kHz, 44.1 kHz and 48 kHz. The frequency, amplitude, number of bits and sampling
rate can be set. The following tables show the values that are set for the different status
bits in each format. These cannot be changed.
DS360 Ultra Low Distortion Function Generator
into a load
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