WAU8822YG Nuvoton Technology Corporation of America, WAU8822YG Datasheet - Page 9

• Manufacturer Part Number: WAU8822YG
• Description: IC STER AUDIO CODEC 24BIT 32-QFN
• Manufacturer: Nuvoton Technology Corporation of America
• Series: emPowerAudio™r
• Type: Stereo Audior

Specifications of WAU8822YG

• Data Interface: I²C, Serial
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 90 / 94
• Voltage - Supply, Analog: 2.5 V ~ 3.6 V
• Voltage - Supply, Digital: 1.65 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• For Use With: WAU8822EVB - BOARD EVALUATION FOR WAU8822
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1
General Description
The WAU8822 is a stereo device with identical left and right channels that share common support elements.
Additionally, the right channel auxiliary output path includes a dedicated submixer that supports mixing the right
auxiliary input directly into the right speaker output driver. This enables the right speaker channel to output audio
that is not present on any other output.
1.1.1 Analog Inputs
All inputs, except for the wide range programmable amplifier (PGA), have available analog input gain conditioning
of -15dB through +6dB in 3dB steps. All inputs also have individual muting functions with excellent channel
isolation and off-isolation from all outputs. All inputs are suitable for full quality, high bandwidth signals.
Each of the left-right stereo channels includes a low noise differential PGA amplifier, programmable for high-gain
input. This may be used for a microphone level through line level source. Gain may be set from +35.25db through
-12dB at the analog difference-amplifier type programmable amplifier input stage. A separate additional 20dB
analog gain is available on this input path, between the PGA output and ADC mixer input. The output of the ADC
mixer may be routed to the ADC and/or analog bypass to the analog output sections.
Each channel also has a line level input. This input may be routed to the input PGA, and/or directly to the ADC
input mixer.
Each channel has a separate additional auxiliary input. This is a line level input which may be routed the ADC input
mixer and/or directly to the analog output mixers.
1.1.2 Analog Outputs
There are six high current analog audio outputs. These are very flexible outputs that can be used individually or in
stereo pairs for a wide range of end uses. However, these outputs are optimized for specific functions and are
described in this section using the functional names that are applicable to those optimized functions.
Each output receives its signal source from built-in analog output mixers. These mixers enable a wide range of
signal combinations, including muting of all sources. Additionally, each output has a programmable gain function,
output mute function, and output disable function.
The RHP and LHP headphone outputs are optimized for driving a stereo pair of headphones, and are powered from
the main analog voltage supply rail, VDDA. These outputs may be coupled using traditional DC blocking series
capacitors. Alternatively, these may be configured in a no-capacitor DC coupled design using a virtual ground at ½
VDDA provided by an AUXOUT analog output.
The AUXOUT1 and AUXOUT2 analog outputs are powered from the VDDSPK supply rail and VSSSPK ground
return path. The supply rail may be the same as VDDA, or may be a separate voltage up to 5.5Vdc. This higher
voltage enables these outputs to have an increased output voltage range and greater output power capability.
The RSPKOUT and LSPKOUT loudspeaker outputs are powered from the VDDSPK power supply rail and
VSSGND ground return path. LSPKOUT receives its audio signal via an additional submixer. This submixer
supports combining a traditional alert sound (from the RAUXIN input) with the right channel headphone output
mixer signal. This submixer also provides the signal invert function that is necessary for the normal BTL (Bridge
Tied Load) configuration used to drive a high power external loudspeaker. Alternatively, each loudspeaker output
may be used individually as a separate high current analog output driver.
WAU8822 Data Sheet Rev 0.86
Page 9 of 21
September 4, 2008
emPowerAudio
™