Adc Registers - Cirrus Logic CS42L42 Manual

Bits Name
4 HSBIAS_ HSBIAS pull down. Used to enable a 60-k pulldown on HS bias.
PD
0 (Default) Pulldown resistor off
1 Pulldown resistor on
Reserved
3:2 —
1:0 HSBIAS_ HSBIAS ramp rate. Sets bidirectional output ramp rate between ground and set level. See
RAMP
Note: After setting HSBIAS_RAMP and powering up the mic bias
changed until the ramp delay count is reached. Approximate ramp delay counts for HS_BIAS_RAMP = 00/01/10/11 are,
respectively, 10/40/90/170 ms. After the ramp delay count,
00 Fast rise time; slow, load-dependent fall time.
01 Fast

7.11 ADC Registers

7.11.1 ADC Control
R/W
7
—
Default
0
Bits Name
5 ADC_ ADC digital notch filter disable. Disables the digital notch filter on the ADC.
NOTCH_
0 (Default) Enabled
DIS
1 Disabled
4 ADC_ ADC force analog input weak VCM. Controls the status of the weak VCM for the analog input.
FORCE_
0 (Default) Normal operation
WEAK_VCM
1 Forced on
3 — Reserved
2 ADC_INV ADC invert signal polarity. Configures the polarity of the ADC signal. See
0 (Default) Not inverted
1 Inverted
3 — Reserved
0 ADC_DIG_ ADC digital boost. Configures a +20-dB digital boost on the ADC. See
BOOST
0 (Default) No boost applied
1 +20-dB digital boost applied
7.11.2 ADC Soft-Ramp Enable
R/W
7
Default
0
Bits Name
7:3 — Reserved
2 ADC_ ADC soft-ramp enable. Digital soft ramp enable bit for ADC.
SOFTRAMP_
0 (Default) Disabled
EN
1 Enabled. The soft-ramp rate is set by DSR_RATE
1:0 — Reserved
7.11.3 ADC Volume
R/W
7
Default
0
Bits Name
7:0 ADC_ ADC volume. ADC digital volume. Sets the ADC signal volume. Step size: 1.0 dB
VOL 0111 1111–0000 1100 +12 dB
0000 1011 +11 dB ...
DS1083F2
6 5
ADC_NOTCH_ ADC_FORCE_
DIS WEAK_VCM
0 0
6 5
—
0 0
6 5
0 0
0000 0000 (Default) 0 dB
1111 1111 –1.0 dB
Description
HSBIAS_CTRL
HS_TRUE and SHORT_TRUE
10 (Default) Slow
11 Slowest
4 3
— ADC_INV
0 0
Description
Section 4.13.1
Section 4.1.3
4 3
SOFTRAMP_EN
0 0
Description
4 3
ADC_VOL
0 0
Description
1111 1110 –2.0 dB ...
1010 0000 –96.0 dB
CS42L42
7.11 ADC Registers
Table 3-15 for specifications.
(see p. 150), HSBIAS_RAMP cannot be
(see p. 151) become valid.
Address 0x1D01
2 1
—
0 0
for details.
for details.
Address 0x1D02
2 1
ADC_
—
0 1
Address 0x1D03
2 1
0 0
1001 1111–1000 0000 Mute
0
ADC_DIG_
BOOST
0
0
0
0
0
153