TDT RZ2 Manual page 47

System 3 1-41
Programmable Attenuation
The RZ6_AudioOut macro provides access to two channels of programmable
attenuation for precision control of analog output signal levels over a wide dynamic
range.
Programmable attenuation in the RZ6 is achieved using both analog and digital
attenuation methods. The device supports analog attenuation values of 0, 20, 40,
and 60 dB. Attenuation values which lie in-between or exceed 60 dB are handled
using digital attenuation.
For example, if you set an attenuation value of 66 dB in the RZ6_AudioOut macro,
the analog attenuator will be set to 60 dB and the remaining 6 dB of attenuation
will be applied by scaling the digital signal through RPvdsEx.
Note: For the best results, you should utilize the maximum D/A voltage range and use the
RZ6_AudioOut macro to configure the desired attenuation setting for channels A and
B.
Manual Attenuator
The RZ6 includes another level of analog attenuation that
can be controlled manually via the attenuator control knob
from 0 to 27 dB in increments of 3 dB.
Manual attenuation is applied to both channels before the
signals are output on any of the front panel connectors and
is therefore applied in addition to any programmable
attenuation set in RPvdsEx through the RZ6_AudioOut macro.
Analog Output via BNCs
DAC channels A and B are output to BNCs labeled Out-A
and Out-B after attenuation has been applied. These outputs
use a stereo power amplifier to drive TDT's MF1 multi-
function speakers.
Note: A single signal generated or input from any of the RZ6 analog inputs can be ganged
to reduce the spectral variation in power of the transducer across all frequencies
(see "D/A Power Output Diagram" on page 1-47). To do this, configure your
signal to output from both DAC channels as shown in the following diagram.
Ganged Output Connection Diagram
Configure your RPvdsEx circuit to output the same signal to DAC channels A and B
then connect the transducer as shown in the diagram above.
RZ6 Multi I/O Processor