3.0 Audio input and output
The AI-Bravo supports two types of audio I/O:
l
2 USB ports
l
2 DB-15 connectors (i.e., Channel A and Channel B)
Table 1, "Audio input values" below shows the audio input values for Channels A and B:
Characteristic
Value
Input impedance
1.65 kΩ
Input level
4.5 Vpp max (2.2 V
PP
differential)
Input gain
0 dB, +10 dB to +65 dB, software configurable (go to note below)
Table 1: Audio input values
Note
: The AI-Bravo gain covers a total range of 65 dB. You can set the range of 10–65 dB in
1 dB steps; however, you cannot choose the range of 1–9 dB as a function of design.
Table 2, "Audio output values" below shows the audio output values for Channels A and B:
Characteristic
Value
Impedance
10 Ω
Max. power
150 mW at 32 Ω
Max. output signal
3.75 V
PP
at 150 Ω
2.4 V
PP
at 8 Ω
Frequency response
20 Hz to 20 kHz
Table 2: Audio output values
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AI-Bravo Technical User Guide (Rev. B, Ver. 0)