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3. TECHNICAL BRIEF
3.13 Earpiece
The earpiece is driven directly from AD6521 VOUTNORP (#K8) and VOUTNORN (#K7) pins and
the gain is controlled by the PGA in an AD6521. The earpiece is located in the handset floder front
panel, and the signals are routed to it via FPCB connector between Main Board and FPCB board.
But, The VOUTNORP signal has to be selected by the control signal "SPK_EN". If SPK_EN is low,
VOUTNORP is directly connected to the Earpiece, else VOUTNOTP is connected to the Midi
Chip(U203).
Figure 3-13. Earpiece & Handsfree Interface
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