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1.5.4. Audio Inputs and Outputs
1.5.4.1.
Microphone Input
RT6512 is designed for a standard microphone:
•
Unbalanced,
•
DC coupled,
•
DC supplied from RT6512.
The bias current for standard microphone is drawn from RT6512 internal source 15 VDC via series
resistor 470 Ohm. The input audio signal is routed to a dynamic compressor keeping the modulation
factor limited over a wide input voltage range. The microphone input uses the cable guard as ground
compensation so microphone input shall be connected exactly as specified on Installation diagrams.
1.5.4.2.
Audio Input LINE IN
The RT6512 symmetrical line input has no DC connection to ground. Input impedance is 600 Ω. The
maximum input level without clipping can be set as high as 6 V. The input audio signal is routed to a
dynamic compressor keeping the modulation factor limited over a wide input voltage range.
1.5.4.3.
Audio Output LINE OUT
The audio output LINE OUT design is symmetrical and has no DC connection to ground. If volume set
to maximum, the audio output power delivered is 100...125 mW into 600 Ω or 200 mW into 150 Ω.
DV17501.03 Issue 05 May 2017
Figure 1 Standard Microphone Input Schematic
Figure 2 LINE_IN Schematic
Figure 3 LINE_OUT
RT6512
General Description
Scope of Functionality
15
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