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NAU82011YG Datasheet Rev1.1 Page 1 of 22 April 2020 NAU82011YG
2.9 W Mono Filter-Free Class-D Audio Amplifier
1 GENERAL DESCRIPTION
The NAU82011YG is a mono high efficiency filter -free Class-D audio amplifier with variable gain, which is capable of driving a 4Ω load with up to 2.9W output power. This device provides chip enable pin with extremely low standby current and fast start-up time of 4ms. The NAU82011YG is ideal for the portable applications of battery drive, as it has advanced features like 91% efficiency, either single-ended or differential mode. NAU82011YG is available in QFN-16 package.
FEATURES
Low Quiescent Current:
- 1.2mA at 3.6V
- 1.7mA at 5V Powerful Mono Class-D Amplifier:
- 2.9W (4Ω @ 5V, 10% THD+N)
- 2.3W (4Ω @ 5V, 1% THD+N)
- 1.7W (8Ω @ 5V, 10% THD+N)
- 1.38W (8Ω @ 5V, 1% THD+N) Low Output Noise: 20 µVRMS Low Current Shutdown Mode Integrated Image Reject Filter Click-and Pop Suppression Integrated feedback resistor of 300 kΩ
Applications
Smartphones Tablet PCs Personal Navigation Devices
NAU82011YG Datasheet Rev1.1 Page 2 of 22 April 2020 VDD VSS Current / Thermal Protection VIN Class D Modulator Output Driver VIP NAU82011YG EN Click / Pop Suppression Figure 1: NAU82011YG Block Diagram
2 Pin out
Part Number Dimension Package Package Material NAU82011YG 3mm x 3mm QFN-16 Green
NAU82011YG Datasheet Rev1.1 Page 3 of 22 April 2020
3 Pin Descriptions
Pin # Name Type Functionality
1 NC NC No Connection
2 VDD Supply Power Supply
3 EN Digital Input Chip Enable (High = Power Up; Low = Power Down)
4 GND Supply High Current Ground
5 VDD Supply Power Supply
6 VIP Analog Input Positive Differential Input
7 VIN Analog Input Negative Differential Input
8 NC NC No Connection
9 NC NC No Connection
10 GND Supply High Current Ground
11 VDD Supply Power Supply
12 NC NC No Connection
13 VOUTP Analog Output Positive BTL Output
14 GND Supply High Current Ground
15 GND Supply High Current Ground
16 VOUTN Analog Output Negative BTL Output
Table 1: NAU82011YG Pin description
NAU82011YG Datasheet Rev1.1 Page 4 of 22 April 2020
Electrical Characteristics
Conditions: EN = VDD = 5V, VSS = 0V, Av = 6dB, ZL = ∞, unless otherwise specified, R1 = 150kΩ, Bandwidth = 20Hz to 22 kHz, TA = 25 oC Parameter Symbol Comments/Conditions Min Typ Max Units Power Delivered Output Power Pout ZL = 4Ω + 33µH THD + N = 10% VDD = 5.0V 2.9 W VDD = 3.6V 1.48 ZL = 4Ω + 33µH THD + N = 1% VDD = 5.0V 2.3 VDD = 3.6V 1.2 ZL = 8Ω + 68µH THD + N = 10% VDD = 5.0V 1.7 VDD = 3.6V 0.88 ZL = 8Ω + 68µH THD + N = 1% VDD = 5.0V 1.38 VDD = 3.6V 0.71 Parameter Symbol Comments/Conditions Min Typ Max Units Chip Enable (EN) Voltage Enable High VEN_H VDD = 2.5V to 5.5V 1.3 V Voltage Enable Low VEN_L VDD = 2.5V to 5.5V 0.35 V Input Leakage Current 0.1 2.0 µA Thermal and Current Protection Thermal Shutdown Temp 150 oC Thermal Shutdown Hysteresis 20 oC Over Current Threshold IOC 2.0 A Gain AV VDD = 2.5V to 5.5V, R1 in kΩ 255/R1 300/R1 345/R1 V/V Resistance (EN pin to GND) REN 300 kΩ
NAU82011YG Datasheet Rev1.1 Page 5 of 22 April 2020 Electrical Characteristics (continued) Conditions: EN = VDD = 5V, VSS = 0V, Av = 6dB, R1 = 150kΩ, ZL = ∞, unless otherwise specified, Bandwidth = 20Hz to 22 kHz, TA = 25 oC Parameter Symbol Comments/Conditions Min Typ Max Units Normal Operation Quiescent Current Consumption IQUI VDD = 3.6V 1.2 mA VDD = 5V 1.7 mA Shut Down Current IOFF EN = 0 0.5 µA Oscillator Frequency fOSC 300 kHz Efficiency η RL = 8Ω 91 % Start Up Time Tstart 4 msec Output Offset Voltage VOS ±1 mV Common Mode Rejection Ratio CMRR fIN = 1kHz 63 dB Click-and-Pop Suppression 1Hz Shutdown (ZL=8Ω) 83 dBV Power Supply Rejection Ratio PSRR DC PSRR 95 dB AC PSRR VRIPPLE = 0.2Vpp@1kHz 60 dB Noise Performance VDD = 3.6V (A-weighted) 20 µVRMS Absolute Maximum Ratings Parameter Min Max Units Analog supply -0.50 +5.50 V Industrial operating temperature -40 +85 °C Storage temperature range -65 +150 °C Junction temperature range -40 +150 °C CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely influence product reliability and result in failures not covered by warranty.
NAU82011YG Datasheet Rev1.1 Page 6 of 22 April 2020 Recommended Operating Conditions Parameter Symbol Min Typical Max Units Analog supply range VDD 2.50 5.00 5.50 V Ground VSS 0 V Input Resistor (Gain ≤ 26dB ) R1 15 kΩ Common mode Input voltage range VDD = 2.5V to 5.5V and CMRR ≥ 49dB VIC 0 VDD - 1.0 V Test Set up VDD Audio Precision Output Audio Precision Input 30kHz low pass RC filterNAU82011 ZL 0.1uF 0.1uF Note: The 30kHz low pass RC filter is implemented by using R= 1k Ohm and C = 4.7nF
NAU82011YG Datasheet Rev1.1 Page 7 of 22 April 2020
5 Typical Operating Characteristics
Conditions: EN = VDD = 5V, VSS = 0V, Av = 6dB (R1=150kΩ), ZL = ∞, unless otherwise specified, Bandwidth = 20Hz to 22 kHz, TA = 25 oC, unless otherwise noted 0.0001 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 50mW Pout 250mW Pout 1W ZL= 8Ω+ 68μH VDD 5V 0.0001 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 25mW Pout 125mW Pout 500mW ZL= 8Ω+ 68μH VDD 3.6V 0.0001 0.001 0.01 0.1 20 200 2000 20000 THD+N(%) Frequency( HZ) THD+N vs Frequency Pout 15mW Pout 75mW Pout 200mW ZL= 8Ω+ 68μH VDD 2.5V 0.0001 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 100mW Pout 500mW Pout 2W ZL= 4Ω+33μH VDD 5V
NAU82011YG Datasheet Rev1.1 Page 8 of 22 April 2020 0.0001 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 50mW Pout 250mW Pout 1W ZL= 4Ω+ 33μH VDD 3.6V 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 30mW Pout 150mW Pout 400mW ZL = 4Ω+33 μH VDD 2.5V
NAU82011YG Datasheet Rev1.1 Page 9 of 22 April 2020 0.001 0.01 0.1 100 0.01 0.1 1 10 THD+N [%] Output Power [W] THD+N vs Output Power VDD 2.5V VDD 3.6V VDD 5V ZL= 8Ω+ 68μH 0.001 0.01 0.1 100 0.01 0.1 1 10 THD+N [%] Output Power [W] THD+N vs Output Power VDD 2.5V VDD 3.6V VDD 5V ZL= 4Ω+ 33μH
NAU82011YG Datasheet Rev1.1 Page 10 of 22 April 2020 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 Supply Current [A] Output Power [W] Supply Current vs Output Power Vdd 5V Vdd 3.6V Vdd 2.5V ZL=8Ω+ 68μH 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 1 2 3 4 Supply Current [A] Output Power [W] Supply Current vs Output Power VDD 5V VDD 3.6V VDD 2.5V ZL=4Ω+ 33μH
NAU82011YG Datasheet Rev1.1 Page 11 of 22 April 2020 100 Efficiency [%] Output Power [W] Efficiency vs Output Power VDD 5V VDD 3.6V VDD 2.5V ZL=8Ω+ 68μH 100 0 1 2 3 4 Efficiency [%] Output Power [W] Efficiency vs Output Power VDD 5V VDD 3.6V VDD 2.5V ZL=4Ω+ 33μH
NAU82011YG Datasheet Rev1.1 Page 12 of 22 April 2020 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 20 200 2000 20000 PSRR [dB] Frequency [Hz] PSRR vs Frequency VDD 5V VDD 3.6V VDD 2.5V ZL= 8Ω+ 68μH -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 20 200 2000 20000 PSRR [dB] Frequency [Hz] PSRR vs Frequency VDD 5V VDD 3.6V VDD 2.5V ZL = 4Ω+ 33μH
NAU82011YG Datasheet Rev1.1 Page 13 of 22 April 2020 Note1: All the above plots are captured with 0.1uF input capacitor. It is recommended to use 2.2uF input capacitor to get a flat low frequency response. Note2 : The above PSRR plots are captured with input capacitors 2.2uF
6 Special Feature Description
The NAU82011YG offers excellent quantity performance as high efficiency, high output power and low quiescent current. It also provides the following special features. -90 -80 -70 -60 -50 -40 -30 -20 -10 20 200 2000 20000 CMRR [dB] Frequency [Hz] CMRR vs Frequency VDD 2.5V VDD 3.6V VDD 5V ZL=8Ω+68µH -90 -80 -70 -60 -50 -40 -30 -20 -10 20 200 2000 20000 CMRR [dB] Frequency [Hz] CMRR vs Frequency VDD 2.5V VDD 3.6V VDD 5V ZL=4Ω+33µH
NAU82011YG Datasheet Rev1.1 Page 14 of 22 April 2020
6.1 Device Protection
The NAU82011YG includes device protection for three operating scenarios. They are 1. Thermal Overload 2. Short circuit 3. Supply under voltage
6.1.1 Thermal Overload Protection
When the device internal junction temperature reaches 150°C, the NAU82011YG will disable the output drivers. When the device cools down and a safe operating temperature of 130°C has been reached for at least about 100ms, the output drivers will be enabled again.
6.1.2 Short Circuit Protection
If a short circuit is detected on any of the pull-up or pull-down devices on the output drivers for at least 16.7µs, the output drivers will be disabled for 100ms. The output drivers will then be enabled again and check for the short circuit. If the short circuit is still present, the output drivers are disabled after 16.7µs. This cycle will continue until the short circuit is removed. The short circuit threshold is 2.0A at 3.6V.
6.1.3 Supply under Voltage Protection
If the supply voltage drops under 2.1V, the output drivers will be disabled while the NAU82011YG control circuitry still operates. This will avoid the battery supply to drag down too low before the host processor can safely shut down the devices on the system. If the supply drops further below 1.6 V the internal power on reset is activated and puts the entire device in power down state.
6.2 Power up and Power Down Control
When the supply voltage ramps up, the internal power on reset circuit gets triggered. At this time all internal circuits will be set to power down state. The device can be enabled by setting the EN pin high. Upon setting the EN pin high, the device will go through an internal power up sequence in order to minimize ‘pops’ on the speaker output. The complete power up sequence will take about 4ms. The device will power down in about 30 µs, when the EN pin is set low. It is important to keep the input signal at zero amplitude in order to minimize the ‘pops’ when the EN pin is toggled.
NAU82011YG Datasheet Rev1.1 Page 15 of 22 April 2020
7 Application Information
7.1 Application diagram
7.1.1 Single ended input configuration
150 kΩ 150 kΩ 0.1µF 0.1µF VDD 0.1µF 10µF
7.1.2 Differential input configuration
150 kΩ 150 kΩ 0.1µF 0.1µF VDD 0.1µF 10µF
NAU82011YG Datasheet Rev1.1 Page 16 of 22 April 2020
7.2 Component selection
7.2.1 Input resistors for Gain
NAU82011YG has a provision for variable gain setting by using external input resistors. The gain is expressed as the ratio of the internal feedback resistor of 300kΩ and the external input resistor R. The Gain is expressed as 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺 = 300 𝑘𝑘Ω 𝑅𝑅1 𝑘𝑘Ω 𝑉𝑉 𝑉𝑉 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺 (𝑑𝑑𝑑𝑑) = 20 log 300 𝑘𝑘Ω 𝑅𝑅1 𝑘𝑘Ω
7.2.2 Coupling Capacitors
An ac coupling capacitor (Cin) is used to block the dc content from the input source. The input resistance of the amplifier (R) together with the Cin will act as a high pass filter. So depending on the required cut off frequency the Cin can be calculated by using the following formula 𝐶𝐶𝐺𝐺𝐺𝐺 = 1/2𝜋𝜋𝜋𝜋1𝑓𝑓𝑐𝑐 Where 𝑓𝑓𝑐𝑐 is the desired cut off frequency of the High pass filter. Input Output Cin R1 Amplifier
7.2.3 Bypass Capacitors
Bypass capacitors are required to remove the ac ripple on the VDD pins. The value of these capacitors depends on the length of the VDD trace. In most cases, 10uF and 0.1uF are enough to get the good performance.
7.3 Layout considerations
Good PCB layout and grounding techniques are essential to get the good audio performance. It is better to use low resistance traces as these devices are driving low impedance loads. The resistance of the traces has a significant effect on the output power delivered to the load. In order to dissipate more heat, use wide traces for the power and ground lines.
NAU82011YG Datasheet Rev1.1 Page 17 of 22 April 2020
7.4 Class D without filter
The NAU82011YG is designed for use without any filter on the output line. That means the outputs can be directly connected to the speaker in the simplest configuration. This type of filter less design is suitable for portable applications where the speaker is very close to the amplifier. In other words, this is preferable in applications where the length of the traces between the speaker and amplifier is short. The following diagram shows this simple configuration. VOUTP VOUTN NAU82011YG outputs connected to speaker without filter circuit
7.5 Class D with filter
In some applications, the shorter trace lengths are not possible because of speaker size limitations and other layout reasons. In these applications, the long traces will cause EMI issues. There are two types of filter circuits available to reduce the EMI effects. These are ferrite bead and LC filters.
7.5.1 Ferrite Bead filter
The ferrite bead filters are used to reduce the high frequency emissions. The typical circuit diagram is shown in the figure. 1nF 1 nF Ferrite Bead Ferrite Bead VOUTP VOUTN NAU82011YG outputs connected to speaker with Ferrite Bead filter The characteristic of ferrite bead is such that it offers higher impedance at high frequencies. For better EMI performance select ferrite bead which offers highest impedance at high frequencies, so that it will attenuate the signals at higher frequencies. Usually the ferrite beads have low impedance in the audio range, so it will act as a pass through filter in the audio frequency range.
NAU82011YG Datasheet Rev1.1 Page 18 of 22 April 2020
7.5.2 LC filter
The LC filter is used to suppress the low frequency emissions. The following diagram shows the NAU82011YG outputs connected to the speaker with LC filter circuit. RL is the resistance of the speaker coil. VOUTP VOUTN L C C RL L NAU82011YG outputs connected to speaker with LC filter L C Input Output R Standard Low pass LCR filter The following are the equations for the critically damped (ζ = 0.707) standard low pass LCR filter 2𝜋𝜋𝑓𝑓𝑐𝑐 = √(𝐿𝐿𝐿𝐿) 𝑓𝑓𝑐𝑐 is the cutoff frequency 𝜁𝜁 = 0.707 = 1 2𝜋𝜋 ∗√𝐿𝐿 𝐶𝐶 The L and C values for differential configuration can be calculated by duplicating the single ended configuration values and substituting R L = 2R.
NAU82011YG Datasheet Rev1.1 Page 19 of 22 April 2020
8 Package Dimensions
8.1 16 pin QFN package
NAU82011YG Datasheet Rev1.1 Page 20 of 22 April 2020
9 Ordering Information
Part Number Dimension Package Package Material NAU82011YG 3x3 mm QFN-16 Green Package Type: Y = 16-Pin QFN Package Package Material: G = Pb-free Package NAU82011 _ _
NAU82011YG Datasheet Rev1.1 Page 21 of 22 April 2020
REVISION HISTORY
VERSION DATE PAGE DESCRIPTION NAU82011YG Datasheet Rev1.0 Sep, 2018 NA Revision1.0 Rev 1.1 April 2020 Remove Preliminary Table 1: Revision History
NAU82011YG Datasheet Rev1.1 Page 22 of 22 April 2020 Important Notice Nuvoton Products are neither intended nor warranted for usage in systems or equipment, any malfunction or failure of which may cause loss of human life, bodily injury or severe property damage. Such applications are deemed, “Insecure Usage”. Insecure usage includes, but is not limited to: equipment for surgical implementation, atomic energy control instruments, airplane or spaceship instruments, the control or operation of dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all types of safety devices, and other applications intended to support or sustain life. All Insecure Usage shall be made at customer’s risk, and in the event that third parties lay claims to Nuvoton as a result of customer’s Insecure Usage, customer shall indemnify the damages and liabilities thus incurred by Nuvoton.