Specifications

Wireless CPU
®
Q24 Series
Interfaces
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WM_PGM_Q24NG_PTS_001-005 November 20, 2007
Microphone gain versus Max input voltage
Using Controller 1 Using Controller 2
Transmit Gain
(dB)
Max V Vin (m rms) Transmit Gain (dB) Max Vin (mVrms)
+30 43.80 3031 -6.5
+33 31.01 -6 2861
[phone] .95 0
+39 480 15.54 +9.5
+42 454 11 +10
+45 7.79 0.3 43.80 +3
+48 5.51 41.36 +30.8
+51 +50.8 4.14 3.9
- - +51.3 3.90
* For more details, refer to the AT commands documentation [4]
3.12.1.2 MIC1 Microphone Inputs
The MIC1 inputs are differential and do not include internal bias
. To use these inputs
with an electret microphone, bias must be generated outside the Wireless CPU
®
Q24
Series in accordance with the characteristic of this electret microphone. These inputs
et or a hands-free kit.
The impedance of microphone 1 must be around 2 kΩ. AC coupling is already
embedded in the Wireless CPU
®
.
quivalent circu
are the standard inputs used either for an external heads
E its
DC equivalent circuit AC equivalent circuit