2. Operation
When you have connected the power and the audio cables, you can activate the main switch
on the rear panel in order to turn on the ADDA 2402.
Analog input
Digital input
Digital Output Source
Sample Rate
Sync.
XLR
Jack
Analog in
Digital in
S/P DIF
T DIF
Carrier
32
44,1
48
64
88,2
96
Power
L
R
-60
-50
-40
-30
-20
-16
-12
-8
-4
0
-60
-50
-40
-30
-20
-16
-12
-8
-4
0
Int. sync
Ext. sync
Digital input
AES/EBU
kHz
kHz
kHz
kHz
kHz
kHz
Dither
20 bit
18 bit
16 bit
24 bit
Analog input
selector
Peakmeter
Digital input
selector
Digital output
source
Sample rate
selector
Dither
selector
Digital sync
selector
Power
switch
After start-up the ADDA 2402 has to calibrate for about 20 seconds. It is recommended to
leave the ADDA 2402 on for approximately 5 minutes in order to warm up, and then activate
the sample-rate selection or digital input source switch. This will cause the converter to
recalibrate, and improve the dynamic range in a region of 1 to 2 dB. During the start-up
calibration process the –60dB LEDs of the PPM lights up, and the
Int. Sync
and
Ext. Sync
LED
will blink slowly.
The ADDA 2402 has a non-volatile memory system enabling the converter to remember the
active settings. After a power up, the ADDA 2402 will restore the settings from before it was
powered down.
Front Panel Controls
The buttons on the front panel control the mode of operation of the ADDA 2402. All settings
are shown by light diode indicators (LEDs). Each time a button is activated the corresponding
mode will change between the possible settings.
Analog Input
On the
Analog Input
button you can switch between the balanced XLR input and unbalanced
Jack input. The input signal will be converted to a digital signal when the
Digital Output
Source
mode is set to analog in. The digital signal is available on the AES/EBU, S/PDIF and
the optical output connectors.
Digital Input
On the
Digital Input Source
button you can select which of the digital inputs you would like
to be active. You can choose between AES/EBU, S/PDIF and Optical (TosLink). The digital
input chosen will always be converted to an analog signal and sent to balanced and
unbalanced analog output connectors. This means the DA converter in the ADDA 2402 will
always be active, if there is a digital input signal, no matter what other mode you use for some
of the other buttons (except the power button of course).
If there is a valid digital input signal on the selected digital input, the “Carrier” LED will
light up.
Digital Output Source
On the
Digital Output Source
button you can choose between analog and digital input. If you
choose analog input, the ADDA 2402 will convert your analog input to a digital output. If you
choose digital input, the ADDA 2402 will work as a sample-rate converter, and convert the
digital input to the sample-rate you have choosen on the
Sample Rate
button.
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