SGTL5000XNAA3R2 Datasheet, PDF (47/68 Pages) Freescale Semiconductor, Inc – Low Power Stereo Codec with Headphone Amp

FUNCTIONAL DEVICE OPERATION
PROGRAMMING EXAMPLES
BITS
FIELD
RW RESET
DEFINITION
10 LO_PASS_MASTERV RW
0x0
Tie the main analog VAG to the LINEOUT VAG. This can improve SNR for the
AG
LINEOUT when both are the same voltage.
9 INVERT_DAC_SAMPL RW
0x0
Change the clock edge used for the DAC output sampling.
E_CLOCK
8 INVERT_DAC_DATA_ RW
0x0
Change the clock edge used for the digital to analog DAC data crossing.
TIMING
7
DAC_EXTEND_RTZ RW
0x0
Extend the return-to-zero time for the DAC.
6
DAC_DOUBLE_I
RW
0x0
Double the output current of the DAC amplifier when it is in classA mode.
5
DAC_DIS_RTZ
RW
0x0
Turn off the return-to-zero in the DAC. In mode cases, this hurts the SNDR of the DAC.
4
DAC_CLASSA
RW
0x0
Turn off the classAB mode in the DAC amplifier. This mode should normally not be
used. The output current is not high enough to support a full scale signal in this mode.
3 INVERT_ADC_SAMPL RW
0x0
Change the clock edge used for the ADC sampling.
E_CLOCK
2 INVERT_ADC_DATA_ RW
0x0
Change the clock edge used for the analog to digital ADC data crossing
TIMING
1
ADC_LESSI
RW
0x0
Drops ADC bias currents by 20%
0
ADC_DITHEROFF RW
0x0
Turns off the ADC dithering.
The Table 39, CHIP_SHORT_CTRL 0x003C register
contains controls for the headphone short detectors.
Table 39. CHIP_SHORT_CTRL 0x003C
15
RSVD
14
13
12
LVLADJR
11
RSVD
10
9
8
LVLADJL
7
RSVD
6
5
4
LVLADJC
3
2
MODE_LR
1
0
MODE_CM
BITS
15
14:12
11
FIELD
RSVD
LVLADJR
RSVD
RW RESET
DEFINITION
RO
0x0
Reserved
RW
0x0
These bits adjust the sensitivity of the right channel headphone short detector in 25 mA
steps.This trip point can vary by ~30% over process so leave plenty of guard band to
avoid false trips. This short detect trip point is also effected by the bias current
adjustments made by CHIP_REF_CTRL -> BIAS_CTRL and by CHIP_ANA_TEST1 -
> HP_IALL_ADJ.
0x3=25 mA
0x2=50 mA
0x1=75 mA
0x0=100 mA
0x4=125 mA
0x5=150 mA
0x6=175 mA
0x7=200 mA
RO
0x0
Reserved
Analog Integrated Circuit Device Data
Freescale Semiconductor
SGTL5000
47