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Nuvoton Technology Corporation NAU8220WG
NAU8220WG Product Description
NAU8220WG Overview
The NAU8220WG from Nuvoton Technology Corporation is a stereo analog audio line driver for consumer audio equipment. It provides ground-referenced 2 Vrms outputs from a single 3.3 V supply, supporting connections between audio-processing circuitry and external line-level inputs. Typical applications include televisions, set-top boxes, A/V receivers, and media players.
Technical Context
In an audio signal chain, the NAU8220WG sits after a DAC or analog processing stage and before the line-output connector. Its charge pump generates a negative rail, enabling bipolar output swing around ground without output DC-blocking capacitors.
External resistors set gain. The recommended single-ended configuration uses 15 kΩ input and 30 kΩ feedback resistors for an inverting gain of two. Mute and undervoltage control coordinate output activation with supply and signal readiness.
Key Specifications
- Operating supply: 3.0–3.6 V. Supports integration with a nominal 3.3 V audio supply.
- Output level: 2 Vrms at 3.3 V supply. Provides the signal amplitude needed by compatible consumer line inputs.
- A-weighted SNR: 108 dB typical. Helps preserve low-level audio detail above the output noise floor.
- Channel separation: 110 dB at 1 kHz. Limits signal leakage between the stereo channels.
- Mute attenuation: 114 dB. Suppresses signal feedthrough when the outputs are muted.
- Output offset: within ±1 mV. Limits DC voltage presented to downstream line-input circuitry under specified conditions.
- Operating temperature: −40°C to +85°C. Defines the supported ambient operating range for thermal planning.
Specifications depend on the datasheet test conditions. Typical performance does not represent a guaranteed limit across every load, frequency, and operating condition.
Pinout & Package
The NAU8220WG uses a 14-pin TSSOP with a nominal 5.0 mm × 4.4 mm body.
- Pins 1/2, RINP/RINN: Right-channel inputs.
- Pin 3, ROUT: Right-channel output.
- Pins 4/10, GND: Ground.
- Pin 5, MUTEB: Active-low mute control.
- Pin 6, VEE: Negative-rail decoupling.
- Pins 7/8, CN/CP: Charge-pump capacitor connections.
- Pin 9, VDD: Positive supply.
- Pin 11, UVP: Undervoltage detection.
- Pin 12, LOUT: Left-channel output.
- Pins 13/14, LINN/LINP: Left-channel inputs.
For NAU8220WG pinout design, keep charge-pump and decoupling connections short. Route sensitive inputs away from switching nodes and verify the complete footprint against the official package drawing.
Key Features
- Integrated charge pump: In single-supply playback equipment, provides the negative rail needed for ground-centered audio swing, simplifying power architecture.
- Ground-referenced outputs: In stereo line-output stages, removes the need for large output coupling capacitors, reducing component count and board area.
- Pop/click suppression: In consumer equipment, manages startup transitions to reduce audible disturbances during power sequencing.
- Differential or single-ended inputs: In DAC interface circuits, accommodates different analog source arrangements through the appropriate external network.
Applications
Each NAU8220WG application below uses the device as an analog line-output stage.
Set-Top BoxesUsage scenario: Analog stereo connections to external audio equipment. IC role: Drives the line outputs after audio conversion. Value: Provides standard-level analog connectivity from a low-voltage supply. |
LCD and LED TelevisionsUsage scenario: Stereo audio outputs to compatible sound systems. IC role: Interfaces processed analog audio with line-input equipment. Value: Supports compact output circuitry with startup noise suppression. |
A/V ReceiversUsage scenario: Auxiliary stereo line-output paths. IC role: Conditions and drives analog audio signals. Value: Adds a dedicated line interface between processing and connected equipment. |
DVD and Blu-ray PlayersUsage scenario: Analog playback into amplifiers or active speakers. IC role: Provides stereo line drive after the DAC. Value: Enables analog system compatibility with fewer output-stage components. |
Equivalent & Alternatives
A suitable NAU8220WG equivalent must meet the circuit's electrical, mechanical, and sequencing requirements. The following candidates require engineering review before substitution.
NAU8220WG vs NAU8220SG
The NAU8220SG is the same-family SOP-14 package option, retaining the core stereo line-driver architecture. The principal selection difference is packaging: NAU8220WG uses TSSOP-14, while NAU8220SG uses SOP-14.
Selection advice: Choose NAU8220WG for the TSSOP footprint. Consider NAU8220SG for a board designed around SOP-14; it is not a direct mechanical replacement on the existing TSSOP land pattern.
NAU8220WG vs DRV632
The Texas Instruments DRV632 is another stereo, ground-referenced 2 Vrms line driver with an integrated charge pump and external gain setting. TI specifies 2 Vrms into 10 kΩ from 3.3 V, adjustable gain, and external undervoltage muting. Its published headline SNR specification is greater than 90 dB, while Nuvoton lists 108 dB typical for the NAU8220 family; these figures require matching test conditions before comparison.
Selection advice: Evaluate DRV632 for an alternative line-output design when its noise performance, control behavior, and component network meet the application requirements. Similar function and pin count do not establish drop-in compatibility.
Quality & Traceability
Specify genuine Nuvoton components with documented sourcing. Incoming inspection should check markings, package condition, quantities, and available lot records. Define any functional or audio-performance testing in the purchase agreement.
Use ESD-controlled receiving, storage, and assembly procedures. Retain sourcing and inspection documentation for traceability, and follow the applicable moisture-handling and soldering requirements.
Availability & Supply Planning
For stable supply, bulk requirements, and long-term production, request confirmation of available quantities, replenishment lead times, packaging, and scheduled delivery options. Delivery capability and long-term supply commitments should be established through a current quotation and procurement agreement.
Manufacturer
Nuvoton Technology Corporation is an established semiconductor supplier with dedicated audio product families covering converters, amplifiers, and audio SoCs. Its analog and mixed-signal capabilities support audio conversion, processing, and output-interface design.
FAQ
Where can I find the NAU8220WG datasheet download?
The official NAU8220WG datasheet includes electrical specifications, application circuits, pin functions, and package information.
What matters most in NAU8220WG pinout design?
Verify package orientation, charge-pump capacitor connections, local decoupling, and the MUTEB and UVP control networks before fabrication.
Does NAU8220WG process digital audio directly?
No. It handles analog audio. A digital source requires a suitable DAC or codec upstream.
Can NAU8220WG directly drive passive loudspeakers?
It is a line driver rather than a loudspeaker power amplifier. Use a suitable power amplifier between the line output and passive loudspeakers.
NAU8220WG Details
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