January 2001/ version 1.4
WMOi3 Integrated Modem
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4.1.10.44.1.10.4 SpeakerSpeaker 1 Outputs 1 Outputs
Speaker outputs SPK1 are push-pull amplifiers and can be loaded down to 50
Ohms and up to 1nF. These outputs are differential and the output power can be
adjusted by step of 2dB. The output can be directly connected to a speaker.
When using a single-ended connection, be sure to have a very good ground
plane, a very good filtering as well as a shielding in order to avoid any
disturbance on the audio path.
Differential Connection
Single-ended Connection
figure 13 : speaker 1 output
C1 = from 100nF to 47µF as per the speaker characteristics.
Using a single-ended connection also includes losing half of the output power
compared to a differential connection.
Table 21 : speaker 1 output pin description
Signal Pin # I/O I/O type* Description
SPK1P 12 O Analog Speaker 1 positive output
SPK1N 14 O Analog Speaker 1 negative output
*See Table 3 “operating conditions” in subdivision 4.1.1The 50-pin
connector description
SPK1P
SPK1N
+
SPK1P
C1
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