Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.11.2 Speaker Features
The connection is single-ended on AUXO and is differential on EAR. Using a
differential connection to reject common mode noise and TDMA noise is strongly
recommended. Moreover in single-ended mode, ½ of the power is lost. When using a
single-ended connection, make sure to have a very good ground plane, a very good
filtering as well as shielding in order to avoid any disturbance on the audio path. It is
recommended to use the Q64 Wireless CPU
®
AREF pin for good plane connection.
Parameter Typ Unit Connection
Z (EARP, EARN) 4
single-ended mode
Ω
Z (EARP, EARN) 8
Differential mode
Ω
Z (AUXO) 16 or 32
single-ended mode
Ω
3.11.2.1 Speakers Outputs Power
Both speakers maximum power output are not similar, due to the different
configuration between the AUXO which is only single-ended and the EAR which can
be differential, so EAR provides more power.
The maximal specifications given below are available with the maximum power
output configuration values set by an AT command. The default values are
recommended.
3.11.2.1.1 Speaker Outputs
The EAR interface allows differential and single-ended earpiece connection.
Equivalent circuits of SPK1
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prior written agreement.
WA_DEV_Q64_PTS_001-003 January 9, 2009
1
Ω
1
Ω
SPK
Q64
EARN
+
EARP