GM0936TQ Datasheet, PDF (16/21 Pages) Hynix Semiconductor – Voice-Band Audio CODEC for CDMA

PRINCIPLES OF OPERATION
GM0936TQ
40 pF
50 kΩ
50 kΩ
VMID
30 kΩ
40 pF
VMID
30 kΩ
44 _EARA
45 _EARB
40 pF
GM0936TQ
100 kΩ
46 _EARGS
NOTE A: Terminal numbers shown are for the 48 LQFP package.
Figure 4. Earphone Audio-Output Amplifier Configuration
receive data format
In the decoding operation, 16 bits of data are received. The first 13 bits are the D/A code, and the
remaining three bits from the volume control word(see Table 2). The volume control function is
actually an attenuation control in which the first bit received is the most significant. The maximum
volume occurs when all three volume control bits are zero. Eight levels of attenuation are selectable in
3-dB steps, giving a maximum attenuation of 21 dB when all bits are 1s. The volume control bit are not
latched into the GM0936TQ and must be present in each received data word.
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