Rohde & Schwarz R&S UPP, User Manual

Page: 231 / 938

Instrument Functions
R&S
®
UPP
215 User Manual 1411.1055.32 ─ 10
The sampling frequency corresponds to the frequency of the FSYNC signal. All fre-
quency information of generated audio data relates to this setting. If the I
2 S generator
is operated with external wordclock synchronization and the frequency of the external
clock signal does not correspond to the set sampling frequency, the I
2
S generator gen-
erates audio data with an incorrect frequency. Even with external masterclock synchro-
nization, the external clock signal must correspond to the set sampling frequency multi-
plied by the selected MClk ratio. Otherwise, the I
2 S generator also generates audio
data with an incorrect frequency.
The selected clock rate determines the maximum signal frequency which can be input.
For sine-wave signals, this is 49.9
% of the sampling rate.
The standard sampling frequencies can be set directly in the selection field.
The selection item "Value" permits the variable input of the sampling rate in the follow-
ing line.
Value range for numeric input:
6.75 kHz to 200 kHz
Remote command:
OUTPut:SAMPle:MODE
on page 691
OUTPut:SAMPle:FREQuency
on page 694
MClk Freq
Display of the master clock frequency based on the relationship: "Sample Freq" *
"MClk Ratio".
Value range: 864 kHz to 49.152 MHz
Remote command:
OUTPut:FSYNc:FREQuency?
on page 693
BClk Freq
Display of the bit clock frequency. This is calculated from the product of Word Length /
Sample Freq.
Value range: 216 kHz to 12.80 MHz
Configuring the I
2
S Generator