NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 28

• Manufacturer Part Number: NAU8812EVB
• Description: BOARD EVAL FOR NAU8812
• Manufacturer: Nuvoton Technology Corporation of America
• Series: emPowerAudio™r

Specifications of NAU8812EVB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant



ALCMNGAIN[2:0]
ALCMXGAIN[2:0]
ALCEN[8]
ALCSL[3:0]
ALCHT[3:0]
ALCZC[8]
ALCATK[3:0]
ALCDCY[3:0]
ALCM[8]
The operating range of the ALC is set by ALCMXGAIN[5:3] address (0x20) and ALCMNGAIN[2:0] address (0x20) bits
such that the PGA gain generated by the ALC is between the programmed minimum and maximum levels. When the
ALC is enabled, the PGA gain is disabled.
In Normal mode, the ALCMXGAIN bits set the maximum level for the PGA in the ALC mode but in the Limiter mode
ALCMXGAIN has no effect because the maximum level is set by the initial PGA gain setting upon enabling of the
ALC.
emPowerAudio
Datasheet Revision 2.0
Inhibition of gain increment during noise inputs
Limiter mode operation
Bit(s)
ALC Max Gain Range 35.25dB to -6dB @
ALCMAXGAIN
™
111
110
001
000
Addr
0x20
0x21
0x22
6dB increments
Maximum Gain (dB)
Table 15: ALC Maximum and Minimum Gain Values
Minimum Gain of PGA
Maximum Gain of PGA
Enable ALC function
ALC Target
ALC Hold Time
ALC Zero Crossing
ALC Attack time
ALC Decay time
ALC Select
Table 14: Registers associated with ALC Control
35.25
29.25
-0.75
-6.75
Parameter
Page 28 of 109
Range: -12dB to +30dB @ 6dB increment
Range: -6.75dB to +35.25dB @ 6dB increment
0 = Disable
1 = Enable
Range: -28.5dB to -6dB @ 1.5dB increment
Range: 0ms to 1s, time doubles with every step)
0 = Disable
1 = Enable
ALCM=0 - Range: 125us to 128ms
ALCM=1 - Range: 31us to 32ms (time doubles with
every step)
ALCM=0 - Range: 500us to 512ms
ALCM=1 - Range: 125us to 128ms
(Both ALC time doubles with every step)
0 = ALC mode
1 = Limiter mode
ALCMINGAIN
ALC Min Gain Range -12dB to 30dB @
000
001
110
111
6dB increments
Programmable Range
Minimum Gain (dB)
-12
24
30
-6
NAU8812
January 2011