Q2406 Datasheet, PDF (34/81 Pages) List of Unclassifed Manufacturers – SELF CONTAINED E GSM/GPRS 900/1800 OR 850/1900 BI BAND MODULE

WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
Nevertheless in a 32 Ohms speaker case, you should use a cheaper and
smaller solution : R1 = 82 Ohm et C2 = 4.7µF (ceramic)
The gain of SPK outputs is internally adjusted and can be tuned using an AT
command.
Speaker gain vs Max output voltage
Receive Gain (dB) (*) Max output level
(Vrms)
AT+VGR (**)
Max.speaker load (Ω)
+2
1.74
0 to 15
150
0
1.38
16 to 31
50
-2
1.099
32 to 47
32
-4
0.873
48 to 63
32
-6
0.693
64 to 79
32
-8
0.551
80 to 95
32
-10
0.437
96 to 111
32
-12
0.347
112 to 127
32
-14
0.276
128 to 143
32
-16
0.219
144 to 159
32
-18
0.174
160 to 175
32
-20
0.138
176 to 191
32
-22
0.110
192 to 207
32
-24
0.087
208 to 223
32
-26
0.069
224 to 239
32
-26
0.069
240 to 255
32
(*) analog gain : might not be significant
(**) control of the receive gain by AT commands (for WISMO Quik Q24x6
Series driven by AT commands)
Recommended characteristics for the speaker:
• Type : 10 mW, electro-magnetic
• Impedance : 32 to 150 Ω
• Sensitivity : 110 dB SPL min. (0dB = 20µPa)
• Frequency response compatible with the GSM specifications
For possible references, see chapter § 4.4.
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