NAU82039 NUVOTON | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 18
Technical content
NAU82039 Datasheet Rev 1.0 Page 1 of 18 Aug, 2012 NAU82039 3.2W Mono Filter-Free Class-D Audio Amplifier
1 Description
The NAU82039 is a mono high efficiency filter-free Class-D audio amplifier with 12dB of fixed gain, wh ich is capable of driving a 4 Ω load with up to 3.2W output power. This device pro vides chip enable pin with extremely low standby current and fast start-up time of 4ms. The NAU82039 is ideal for the portable applications of battery drive, as it has advanced features like 90dB PSRR at ability to configure the inputs in either single-ended or differential mode. NAU82039 is available in Miniature WCSP-9 (1.21mm x 1.23mm in 0.4mm pitch) package. Key Features /square6 Low Quiescent Current:
- 1.25mA at 3.6V
- 1.8mA at 5V /square6 Powerful Mono Class-D Amplifier:
- 3.2W (4 Ω @ 5V, 10% THD+N)
- 2.54W (4 Ω @ 5V, 1% THD+N)
- 1.42W (8 Ω @ 5V, 1% THD+N) /square6 Low Output Noise: 26 µV RMS (A –Weighted @3.6V) /square6 90dB PSRR @217Hz /square6 Low Current Shutdown Mode /square6 Click-and Pop Suppression /square6 1.21mm x 1.23mm WLCSP (0.4mm Pitch)
Applications
/square6 Smartphones /square6 Tablet PCs /square6 Personal Navigation Devices NAU82039 Block Diagram
NAU82039 Datasheet Rev1.0 Page 2 of 18 Aug, 2012
2 Pin out
Part Number Dimension Package Package Material NAU82039VG 1.21mm x 1.23mm 9-bump WCSP (0.4mm pitch) Pb-Free
3 Pin Descriptions
Pin # Name Type Functionality A1 VIP Analog Input Positive Differential Input A2 VSS Supply High Current Ground A3 VOUTN Analog Output Negative BTL Output B1 VDD Supply Power Supply B2 VDD Supply Power Supply B3 VSS Supply High Current Ground C1 VIN Analog Input Negative Differential Input C2 EN Digital Input Chip Enable (High = Power Up; L ow = Power Down) C3 VOUTP Analog Output Positive BTL Output Table 1 NAU82039 Pin description VIP VDD VIN EN VSS VSS VOUTN VOUTP 1 2 3 A B C VDD
NAU82039 Datasheet Rev1.0 Page 3 of 18 Aug, 2012 Operating Characteristics Conditions: EN = VDD = 5V, VSS = 0V, Av = 12dB, Z L = ∞, Bandwidth = 20Hz to 22kHz, T A = 25 ° C Parameter Symbol Comments/Conditions Min Typ Max Units Power Delivered Output Power P out ZL = 4 Ω + 33µH THD + N = 10% VDD = 5.0V 3.2 W VDD = 3.6V 1.58 ZL = 4 Ω + 33µH THD + N = 1% VDD = 5.0V 2.54 VDD = 3.6V 1.27 ZL = 8 Ω + 68µH THD + N = 10% VDD = 5.0V 1.80 VDD = 3.6V 0.91 ZL = 8 Ω + 68µH THD + N = 1% VDD = 5.0V 1.42 VDD = 3.6V 0.72 Parameter Symbol Comments/Conditions Min Typ Max Units Chip Enable (EN) Voltage Enable High V EN_H VDD = 2.5V to 5.5V 1.3 V Voltage Enable Low V EN_L VDD = 2.5V to 5.5V 0.35 V Input Leakage Current 0.1 2.0 µA Thermal and Current Protection Thermal Shutdown Temperature 150 ° C Thermal Shutdown Hysteresis 20 ° C Limiting Current I LIMIT 2.0 A Single Ended Input Resistance R IN AV = 12dB 75 k Ω Resistance (EN pin to GND) R EN 300 k Ω Parameter Symbol Comments/Conditions Min Typ Max Units Normal Operation Quiescent Current Consumption I QUI VDD = 3.6V 1.20 mA VDD = 5V 1.8 mA Shut Down Current I OFF EN = 0 0.1 µA Oscillator Frequency f OSC 300 kHz Efficiency η WCSP 93 % Start Up Time T start 4 ms Output Offset Voltage V OS ±1 mV Common Mode Rejection Ratio CMRR f IN = 217Hz 80 dB Click-and-Pop Suppression 1Hz Shutdown (Z L=8 Ω) 83 dBV Power Supply Rejection Ratio PSRR DC PSRR 90 dB AC PSRR V RIPPLE = 0.2Vpp @217Hz 90 dB VRIPPLE = 0.2Vpp@1kHz 84 dB VRIPPLE = 0.2Vpp@10kHz 63 dB Noise Performance V DD = 3.6V (A-weighted) 26 µV RMS V DD = 3.6V (unweighted) 36 µV RMS
NAU82039 Datasheet Rev1.0 Page 4 of 18 Aug, 2012 Absolute Maximum Ratings Parameter Symbol Condition Min Max Units DC Power Supply VDD VDD-VSS -0.30 +6.00 V Analog Input Voltage AV IN V IN -VSS -0.3 VDD+0.3 V Digital Input Voltage DV IN DV IN -VSS -0.3 VDD+0.3 V Minimum Load Resistance R L 3.2 Ω Continuous Power Dissipation P O WCSP, T=25°C 530 mW Continuous Power Dissipation P O WCSP, T=85°C 275 mW Storage temperature range Tst -55 +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. Recommended Operating Conditions Parameter Symbol Condition Min Typical Max Units DC Power Supply VDD VDD-VSS 2.50 5.00 5.50 V High-level input voltage(EN pin) V IH 1.30 V Low-level input voltage(EN pin) V IL 0.35 V Operating Temperature T A -40 +25 +85 °C The following setup is used to measure the above parameters
NAU82039 Datasheet Rev1.0 Page 5 of 18 Aug, 2012
4 Typical Operating Characteristics
Conditions: EN = V DD = 5V, VSS = 0V, Av = 12dB, Bandwidth = 20Hz to 22 k Hz, T A = 25 ° C, 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 v 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 Frequency Pout 15mW Pout 75mW Pout 200mW ZL =8Ω + 68μH VDD 2.5V 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) frequency (Hz) THD+N v Frequency Pout 100mW Pout 500mW Pout 2W ZL= 4Ω +33μH VDD 5V
NAU82039 Datasheet Rev1.0 Page 6 of 18 Aug, 2012 Note: All the above plots are captured with 0.1µF i nput capacitor. It is recommended to use 2.2µF inpu t capacitor to get a flat low frequency response. 0.0001 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N v 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 + 33μH VDD 2.5V 0.001 0.01 0.1 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 0.01 0.1 1 10 THD+N (%) Output Power (W) THD+N v Output Power VDD 2.5V VDD 3.6V VDD 5V ZL= 4Ω+ 33μH
NAU82039 Datasheet Rev1.0 Page 7 of 18 Aug, 2012 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 0.8 Supply Current (A) Output Power Supply Current vs Output Power VDD 5V VDD 3.6V VDD 2.5V ZL=4Ω + 33μH 0.5 1.5 2.5 3.5 Output Power (W) Supply Voltage (V) Supply Voltage vs Output Power 8Ω+68μ H 1% 8Ω +68μ H 10% 4Ω+33μ H 1% 4Ω + 33μ H 10% -100 -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
NAU82039 Datasheet Rev1.0 Page 8 of 18 Aug, 2012 Note : The above PSRR plots are captured with input capacitors 2.2µF -120 -100 -80 -60 -40 -20 20 200 2000 20000 PSRR (dB) Frequency (Hz) PSRR vs Frequency VDD 5V VDD 3.6V ZL= 8Ω + 68μH -120 -100 -80 -60 -40 -20 20 200 2000 20000 PSRR (dB) Frequency (Hz) PSRR vs Frequency VDD 3.6 VDD 5V ZL = 4Ω + 33μH 100 Efficiency (%) Output Power (W) Efficiency vs Output Power VDD 5V VDD 3.6V VDD 2.5V ZL=8 Ω + 68 μH 100 Efficiency (%) Output Power (W) Efficiency vs Output Power VDD 5V VDD 3.6V VDD 2.5V ZL=4Ω + 33μH
NAU82039 Datasheet Rev1.0 Page 9 of 18 Aug, 2012 Aug, 2012
NAU82039 Datasheet Rev1.0 Page 10 of 18 Aug, 2012
5 Special Feature Description
The NAU82039 offers excellent quantity performance as high efficiency, high output power and low quiescent current. It also provides the following special features.
5.1 Device Protection
The NAU82039 includes device protection for three o perating scenarios. They are 1. Thermal Overload 2. Short circuit 3. Supply under voltage
5.1.1 Thermal Overload Protection
When the device internal junction temperature reaches 150°C, the NAU82039 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.
5.1.2 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 cont inue until the short circuit is removed. The short circuit threshold is 2.0A at 3.6V.
5.1.3 Supply under Voltage Protection
If the supply voltage drops under 2.1V, the output drivers will be disabled while the NAU82039 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.
5.2 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 w ill power down in about 30µs, when the EN pin is se t low. It is important to keep the input signal at zero amplitude or enable the mute condition in order to minimize the ‘pops’ when the EN pin is toggled.
NAU82039 Datasheet Rev1.0 Page 11 of 18 Aug, 2012
6 Application Information
6.1 Application diagram
6.1.1 Single ended input configuration
6.1.2 Differential input configuration
NAU82039 Datasheet Rev1.0 Page 12 of 18 Aug, 2012
6.2 Component selection
6.2.1 Coupling Capacitors
An ac coupling capacitor (C in ) is used to block the dc content from the input source. The input resistance of the amplifier (R in ) together with the C in will act as a high pass filter. So depending on the required cut off frequency the C in can be calculated by using the following formula /g1829/g3036/g3041 /g3404 /g2869 /g2870/g3095/uni0020/g3019/g3284/g3289/uni0020/uni0020/uni0020/g3033/g3278 Where /g1858/g3030 is the desired cut off frequency of the High pass filter.
6.2.2 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, 10µF and 0. 1µF are enough to get the good performance.
6.3 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. Recommended PCB footprint for NAU82039
NAU82039 Datasheet Rev1.0 Page 13 of 18 Aug, 2012 The recommended PCB footprint for NAU82039 is show n in the above diagram.
6.4 Class D without filter
The NAU82039 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 configurat ion. NAU82039 outputs connected to speaker without filte r circuit
6.5 Class D with filter
In some applications, short 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.
6.5.1 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 NAU82039 outputs connected to speaker with Ferrite Bead filter The characteristic of ferrite bead is such that it offers higher impedance at high frequencies. For be tter 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.
NAU82039 Datasheet Rev1.0 Page 14 of 18 Aug, 2012
6.5.2 LC filter
The LC filter is used to suppress the low frequency emissions. The following diagram shows the NAU8203 9 outputs connected to the speaker with LC filter circuit. R L is the resistance of the speaker coil. NAU82039 outputs connected to speaker with LC filte r Ls Cs 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 /uni0032/g2024/g1858/g3030/uni0020/uni0020/g3404 /g2869 /uni221A/g3013/g3004 /g1858/g3030 is the cutoff frequency /g2014 /g3404 /uni0030/uni002E/uni0037/uni0030/uni0037 /g3404/uni0031 /uni0032/g1844/g1499/g3496/g1838 /g1829 The L and C values for differential configuration can be calculated by duplicating the single ended co nfiguration values and substituting R L = 2R.
NAU82039 Datasheet Rev1.0 Page 15 of 18 Aug, 2012
6.6 NAU82039 EMI performance
The NAU82039 includes a spread spectrum oscillator for reduced EMI. The PWM oscillator frequency typically sweeps in a range of 300 kHz +/- 15 kHz in order to spread the energy of the PWM pulses over a larger frequency band. In addition, slew rate control on the output drivers allows the application of ‘filter less’ loads, while suppressing EMI at high frequencies. The below graph shows the EMI per formance of NAU82039 with and without ferrite beads and speaker cable length of 30cm.
6.6.1 Test Setup
6.6.2 EMI performance with Ferrite bead (220 Ohm@100MHz)
The following are test conditions applied while doing the test: wire length (cm) wire type twisted pair Load Resistance (Ohm) 8 Load Inductance ( µH) 68 Output LC filter No Number of channels Tested 1 Supply Voltage (V) 5 Input Signal Frequency (Hz) 1000 Output Power (Watt) 0.1 Specification Standard EN55022B
NAU82039 Datasheet Rev1.0 Page 16 of 18 Aug, 2012
6.6.3 EMI performance without Ferrite bead
Note: The Blue line is peak measurement but limit is defined as QUASI peak measurement and green X represent QUASI – peak value at corresponding frequency and should be referred to when deciding pass/fail.
NAU82039 Datasheet Rev1.0 Page 17 of 18 Aug, 2012
7 Package Dimensions
7.1 9 bump WCSP (0.4mm pitch)(1.21mm x1.23mm)
NAU82039 Datasheet Rev1.0 Page 18 of 18 Aug, 2012
8 Ordering Information
Nuvoton Part Number Description Version History VERSION DATE PAGE DESCRIPTION Rev1.0 Aug, 2012 NA Preliminary Revision Table 2 Version History Important Notice Nuvoton products are not designed, intended, author ized or warranted for use as components in systems or equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, or for other applications intended to support or sustain life. Furthermore, Nuvoton products are not intended for applications wherein failure of Nuvoton products could result or lead to a situation wherein personal injury, death or severe property or environmental damage could occur. Nuvoton customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Nuvoton for any damages resulting from such improper use or sales. Package Type: V = 9-bump WCSP Package NAU 82039V G Package Material: G = Pb-free Package