NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 36

• 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 NAU8812 features two different types of outputs, a single-ended MONO output (MOUT) and a differential
speaker outputs (SPKOUT+ and SPKOUT-).
configuration referred to as Bridge-Tied Load (BTL).
The speaker amplifiers are designed to drive a load differentially; a configuration referred to as Bridge-Tied Load
(BTL). The differential speaker outputs can drive a single 8Ω speaker or two headphone loads of 16Ω or 32Ω or a
line output. Driving the load differentially doubles the output voltage. The output of the speaker can be manipulated
by changing attenuation and the volume (loudness of the output signal).
The output stage is powered by the speaker supply, VDDSPK, which are capable of driving up to 1.5V
(equivalent to 3V
output pins are at reference DC level when the output is muted.
emPowerAudio
Datasheet Revision 2.0
12.6. ANALOG OUTPUTS
Output from PGA Boost
12.6.1.
SPKVOL[5:0]
(0x36)
SIDETONE
Auxiliary Amplifier
Output from
DAC Output
™
Speaker Mixer Outputs
RMS
Zero Cross
Detection
Buffer
into a BTL speaker). The speaker outputs can be controlled and can be muted individually. The
DACOUT[0]
-10dB or 0dB
(0x38)
Figure 19: Speaker and MONO Analogue Outputs
SPKMXEN[2]
(0x03)
SPEAKER
MIXER
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The speaker amplifiers designed to drive a load differentially; a
Zero Cross
Detection
MOUTMXEN[3]
MONO
MIXER
-10dB or +0dB
(0x03)
MOUTBST[3]
(0x31)
-1
SPKBST[2]
(0x31)
MOUTBST
SPKBST
0
1
0
1
VDDSPK
VSSSPK
GAIN
VDDSPK
1.0x
1.5x
GAIN
1.0x
1.5x
VSSSPK
1.0 x VREF
1.5 x VREF
DC output
1.0 x VREF
1.5 x VREF
DC output
NAU8812
January 2011
MOUT
SPKOUT+
SPKOUT-
RMS
signals