NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 17

• 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

The last two paths above go through the ADC filters where the ALC loop controls the amplitude of the input signal.
The device also has an internal configurable biasing circuit for biasing the microphone, reducing external
components.
An internal inverting operational amplifier circuit allows the auxiliary input pin to connect multiple signals for mixing.
This can be achieved by setting AUXM[3] address (0x2C) to LOW. The combination of the 20k ohm resistors can
vary due to process variation in the gain stage. The block can also be configured to be used as a buffer by setting
AUXM[3] address (0x2C) to HIGH. The internal inverting circuit block can be enable/disable by setting AUXEN[6]
address (0x01).
emPowerAudio
Datasheet Revision 2.0
™
R
R
R
R
Figure 4: Auxiliary Input Circuit Block Diagram with AUXM[3] = 0
Figure 5: Auxiliary Input Circuit Block Diagram with AUXM[3] = 1
AUX
AUX
Pin
Pin
Page 17 of 109
AUXM[3]
AUXM[3]
(0x2C)
(0x2C)
20k
20k
VREF
VREF
AUXM[3]
AUXM[3]
AUXEN[6]
(0x2C)
AUXEN[6]
20k
(0x2C)
20k
(0x01)
(0x01)
Output to
PGA Gain
MONO Mixer
Speaker Mixer
Output to
PGA Gain
MONO Mixer
Speaker Mixer
NAU8812
January 2011