DIP Switch 1
DIP Switch 2
DPLL Bandwidth
ON
N/A
Stereo.
OFF
ON
Dual Mono LEFT
OFF
OFF
Dual Mono RIGHT
Table 1a - On-Board controller Stereo/Dual Mono configuration
Switch
ON
OFF
DIP Switch 3 – FIR Roll Off
Fast
Slow
DIP Switch 4 – IIR Bandwidth
Normal (use with SPDIF/PCM)
50Khz (for DSD)
Table 1b – On-Board controller FIR and IIR settings.
Analog Characteristics
The Buffalo II does not include an output stage but is designed to mate with the IVY III current to voltage
stage. It is not recommended to use the Buffalo II output directly, but it is possible. The output can be used
as a voltage source into a high impedance but THD+N will suffer. THD+N as a voltage source is about -
108db whereas when used with a very low input impedance current to voltage stage such as the IVY-III it
can achieve -120db THD+N in mono mode.
Each analog output at 0DBFS is equivalent to a voltage of approximately 92.4% of AVCC in series with
195
Ω
. So given 3.3VDC AVCC it will be about 3.05Vpp across 195
Ω
. The output will be DC biased at
AVCC/2. This works out to about 16ma peak to peak at each output. The amount of bias current will depend
of the voltage of the virtual ground.
In dual mono mode the channel on the DAC which is opposite the selected channel carries the same analog
signal but anti-phase as shown in table 2. This allows the use of the IVY-III as a single differential
(balanced) mono channel. Dual mono operation is used to achieve the best dynamic range. If you still need
single ended output then you would want to add a high quality BAL/SE converter such as the Ballsie Lite or
the Ventus.
For more detail about the IVY-III please check the IVY-III manual.
Mode
Left Differential Output
Right Differential Output
Stereo
Normal Phase
Normal Phase
Mono - Left
Normal Phase
Anti-Phase
Mono - Right
Anti-Phase
Normal Phase
Table 2 – R47-50 values and balanced output levels. Single ended levels are half the balanced levels.
Connecting Digital Sources
Consumer Level SPDIF
Connect consumer level SPDIF signals to SPDIF and GND at the input terminal block. Make sure the
SPDIF switch is closed.