SGTL5000XNAA3R2 Datasheet, PDF (41/68 Pages) Freescale Semiconductor, Inc – Low Power Stereo Codec with Headphone Amp

FUNCTIONAL DEVICE OPERATION
PROGRAMMING EXAMPLES
Table 30. CHIP_LINE_OUT_CTRL 0x002C
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RSVD
OUT_CURRENT
RSVD
LO_VAGCNTRL
BITS
15:12
11:8
7:6
5:0
FIELD
RSVD
OUT_CURRENT
RSVD
LO_VAGCNTRL
RW RESET
DEFINITION
RO
0x0
Reserved
RW
0x0
Controls the output bias current for the LINEOUT amplifiers. The nominal
recommended setting for a 10 kohm load with 1.0 nF load cap is 0x3. There are only
5 valid settings.
0x0=0.18 mA, 0x1=0.27 mA, 0x3=0.36 mA, 0x7=0.45 mA, 0xF=0.54 mA
RO
0x0
Reserved
RW
0x0
LINEOUT Amplifier Analog Ground Voltage
Controls the analog ground voltage for the LINEOUT amplifiers in 25 mV steps. This
should usually be set to VDDIO/2.
0x00 = 0.800 V
...
0x1F = 1.575 V
...
0x23 = 1.675 V
0x24-0x3F are invalid
Table 31. CHIP_LINE_OUT_VOL 0x002E
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RSVD
LO_VOL_RIGHT
RSVD
LO_VOL_LEFT
BITS
15:13
12:8
7:5
4:0
FIELD
RSVD
LO_VOL_RIGHT
RSVD
LO_VOL_LEFT
RW RESET
DEFINITION
RO
0x0
Reserved
RW
0x4
LINEOUT Right Channel Volume
Controls the right channel LINEOUT volume in 0.5 dB steps. Higher codes have more
attenuation. See programming information for Left channel.
RO
0x0
Reserved
RW
0x4
LINEOUT Left Channel Output Level
The LO_VOL_LEFT is used to normalize the output level of the left line output to full
scale based on the values used to set LINE_OUT_CTRL -> LO_VAGCNTRL and
CHIP_REF_CTRL -> VAG_VAL. In general this field should be set to:
40*log((VAG_VAL)/(LO_VAGCNTRL)) + 15
Table 32 shows suggested values based on typical VDDIO and VDDA voltages.
After setting to the nominal voltage, this field can be used to adjust the output level in
+/-0.5 dB increments by using values higher or lower than the nominal setting.
Table 32. LINEOUT Output Level Values
VDDA
1.8 V
1.8 V
3.3 V
3.3 V
VAG_VAL
0.9
0.9
1.55
1.55
VDDIO
3.3 V
1.8 V
1.8 V
3.3 V
LO_VAGCNTRL
1.55
0.9
0.9
1.55
LO_VOL_*
0x06
0x0F
0x19
0x0F
Analog Integrated Circuit Device Data
Freescale Semiconductor
SGTL5000
41