Q2686 Wavecom, Q2686 Datasheet - Page 46

• Manufacturer Part Number: Q2686
• Description: Wireless CPU
• Manufacturer: Wavecom

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3.11.2 Common Speaker Output Characteristics
The connection is single-ended on SPK1 and either is differential or single-
ended on SPK2.
and TDMA noise is strongly recommended. Moreover, in single-ended mode,
½ of the power is
ground plane, a good filtering as well as shielding in order to avoid any
disturbance on the audio path.
3.11.2.1 Differential Connection
Impedance of the speaker amplifier output in differential mode is shown below:
3.11.2.2 Single-ended Connection
Impedance of the speaker amplifier output in single-ended mode is shown
below:
3.11.3 Speaker Outputs
3.11.3.1 Speaker 2 Outputs
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
SPK2N
SPK2P
Signal
Z (SPK2P, SPK2N)
Z (SPK1P, SPK1N)
Z (SPK2P, SPK2N)
Use of a differential connection to reject common mode noise
confidential ©
number
lost. When using a single-ended connection, ensure a good
Pin
39
41
Speaker 2 outputs pin description
Parameter
Parameter
Electrical characteristics
Electrical characteristics
I/O
O
O
I/O type
Analog
Analog
16 or 32
Typ
Typ
Speaker 2 negative output
Speaker 2 positive output
8
4
Q2686 Wireless CPU
Description
Unit
Unit
Ω
Ω
Ω
Interfaces
March 6, 2007
Page: 45 / 87
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