UPD63310GK-9EU NEC, UPD63310GK-9EU Datasheet - Page 13

• Manufacturer Part Number: UPD63310GK-9EU
• Description: STEREO SOUND CODEC
• Manufacturer: NEC

2.3 Analog Output Block
1.4 V (TYP.), so an output coupling capacitor should be inserted to cut the DC component (see Figure 2-3).
so there is no need for an external LPF.
speaker).
2.4 Use Cautions
may be output from an analog audio output pins (OUTL or OUTR). Such noise is due to the output offset voltage of an
on-chip DAC.
The analog audio output pins (OUTL and OUTR) and the DAC output pins (DACL and DACR) are internally biased to
The out-of-band component of the output signals from these analog pins is attenuated by a post filter (LPF) in the IC,
Set the load resistance to at least 20 k (the speakers cannot be directly driven, so insert a power amp IC before the
Analog audio output pins and DAC output pins that are not used can be left unconnected.
When changing the volume (addresses 17 and 18) between the DAC output and the output mixer, noise (“pop noise”)
If this noise is audible enough to be a problem, take the following measures.
(1) Set mute mode for the volume (addresses 17 and 18) between the DAC output and the output mixer.
(2) Connect the DAC output pins (DACL and DALR) via a capacitor to a pair of unused analog input pins
(3) Adjust the volume (such as addresses 15 and 16) between the analog input pins connected as described
(such as IN4L and IN4R).
in (2) above and the output mixer to adjust the DAC output volume.
Figure 2-3. Analog Output Block Connection Example
OUTL etc.
4.7 F
+
33 k
PD63310
13