GV200 User Manual
3.5.
Audio Interface
There is a differential output for speaker and a signal-ended microphone on GV200. Please
note that the PIN 1 is analog ground and should not be used as a power ground. GV200 has an
audio amplifier internally, so it can drive a louder speaker directly. It is recommended to
connect an 8 Ohm speaker to speaker interface, and an electret microphone is also
recommended.
Figure 18: Example connection for audio
Microphone input characteristics
Table 14: The characteristics of Microphone
Parameter
Min
Typ
Max
Unit
Working Voltage
1.0
1.5
2.0
V
Working Current
200
500
uA
External Microphone Load Resistance
2.2
k Ohm
Please note there are some recommendations about microphone:
1: Use an electret microphone with a sensitivity of -42±3dB/Pa @ 2V
（
not less than -44±3dB
）
and impedance of 2.2k
Ω
.
2: Two filter capacitors (10pF (0603) and 33pF (0603)) are recommended to build into
microphone by vendor. These two capacitors could largely suppress coupling TDD noise
from RF interference.
3: MIC /AGND should be a couple of differential traces, not be close to power supply signals.
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