NAU8214 NUVOTON | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 25
Technical content
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 1 of 25 April 22, 2015 Table of Contents
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 2 of 25 April 22, 2015
1.1 Description
The NAU8214 is a mono high efficiency filte r-free Class -D audio amplifier with variable gain amplifier , 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 NAU8214 is ideal for the portable applications of battery drive, low has the ability to configure the inputs in either single-ended or differential mode. NAU8214 is available in SOP-8 package. Key Features Low Quiescent Current: 1.4mA at 3.6V 2.7mA 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: 56 µVRMS (A –Weighted @3.6V) 82dB PSRR @217Hz Low Current Shutdown Mode Click-and Pop Suppression Max Power limiting feature
Applications
Smartphones Tablet PCs Personal Navigation Devices Rugged hand held computer and two-way radios VDD VSS Current / Thermal Protection VIN Class D Modulator Output DriverVIP ALC NAU8214 EN Click / Pop Suppression R PLMT NAU8214 Block Diagram
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 3 of 25 April 22, 2015
1.2 Pin Descriptions
Part Number Dimension Package Package Material NAU8214SG 4mm x 5mm SOP-8 Green Part Number Dimension Package Package Material NAU8214YG 4mm x 4mm QFN-20 Green VDD(output stage PWR INL NAU8214 MQFN 20-Pin VOUTP NC NC IPL VSS(output stage GND NC NC VIP NC PLM NC NC EN OUTLN NC NC GND
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 4 of 25 April 22, 2015 Pin # Name Type Functionality
1 EN Digital Input Chip Enable (High = Power Up; Low = Power Down)
2 PLMT Power Limiting Power Limiting Threshold
3 VIP Analog Input Positive Differential Input
4 VIN Analog Input Negative Differential Input
5 VOUTP Analog Output Positive BTL Output
6 VDD Supply Power Supply
7 VSS Supply High Current Ground
8 VOUTN Analog Output Negative BTL Output
Table 1 NAU8214 Pin description
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 5 of 25 April 22, 2015
1.3 Operating Characteristics
Conditions: EN = VDD = 5V, VSS = 0V, Av = 18dB, ZL = ∞, Bandwidth = 20Hz to 22kHz, TA = 25 °C 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 0.87 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 Temperature 150 °C Thermal Shutdown Hysteresis 20 °C Limiting Current ILIMIT 2.0 A Single Ended Input Resistance RIN AV = 18dB 10 kΩ Resistance (EN pin to GND) REN 300 kΩ Parameter Symbol Comments/Conditions Min Typ Max Units Normal Operation Quiescent Current Consumption IQUI VDD = 3.6V 1.4 mA VDD = 5V 2.7 mA Shut Down Current IOFF EN = 0 0.5 µA Oscillator Frequency fOSC 300 kHz Efficiency η SOP-8 (ZL=8Ω) 91 % Start Up Time Tstart 4 ms Output Offset Voltage VOS ±1 mV Common Mode Rejection Ratio CMRR fIN = 1KHz 60 dB Power Supply Rejection Ratio PSRR DC PSRR 92 dB AC PSRR VRIPPLE = 0.2Vpp @217Hz 82 dB VRIPPLE = 0.2Vpp@1kHz 80 dB VRIPPLE = 0.2Vpp@10kHz 60 dB Noise Performance VDD = 3.6V (A-weighted) 56 µVRMS
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 6 of 25 April 22, 2015 Parameter Symbol Comments/Conditions Min Typ Max Units
1.4 Absolute Maximum Ratings
Parameter Symbol Condition Min Max Units DC Power Supply VDD VDD-VSS -0.30 +6.00 V Analog Input Voltage AVIN VIN-VSS -0.3 VDD+0.3 V Digital Input Voltage DVIN DVIN-VSS -0.3 VDD+0.3 V Minimum Load Resistance RL 3.2 Ω Continuous Power Dissipation PO WCSP, T=25°C 530 mW Continuous Power Dissipation PO 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.
1.5 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) VIH 1.30 V Low-level input voltage(EN pin) VIL 0.35 V Operating Temperature TA -40 +25 +85 °C
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 7 of 25 April 22, 2015 TYPICAL PERFORMANCE CHARACTERISTICS THD + N vs. Output Power into 8 Ω + 66 μH, Gain = 18 dB THD + N vs. Output Power into 4 Ω + 33 μH, Gain = 18 dB Audio Precision 04/07/14 14:05:49 NAU8214 THD+N vs.Output Power into 8 Ω + 66 μ H, Gain = 18 dB A-A THD+N % vs Output Levl_8ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left 2 1 Green Solid 3 Anlr.THD+N Ratio Left 3 1 Red Solid 3 Anlr.THD+N Ratio Left 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 100u 10 200u 500u 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2 5 OUTPUT POWER (W) Audio Precision 04/07/14 13:54:18 NAU8214 THD+N vs.Output Power into 4 Ω + 33 μ H, Gain = 18 dB A-A THD+N % vs Output Levl.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 S2C.Anlr.THD+N Ratio Left VDD 2.5V 2 1 Green Solid 3 S2C.Anlr.THD+N Ratio Left VDD 3.6V 3 1 Red Solid 3 S2C.Anlr.THD+N Ratio Left VDD 5V 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 100u 10 200u 500u 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2 5 OUTPUT POWER (W)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 8 of 25 April 22, 2015 THD + N vs. Frequency, VDD = 5 V, RL = 8 Ω + 66 μH, Gain = 18 dB THD + N vs. Frequency, VDD = 5 V, RL = 4 Ω + 33 μH, Gain = 18 dB Audio Precision 04/07/14 14:16:47 THD + N vs. Frequency, VDD = 5V, Rl=8ohm+66uH, Gain = 18dB A-A THD+N % vs Frequency_8ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.25W 2 1 Green Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.5W 3 1 Red Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 1W 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz) Audio Precision 04/07/14 14:24:04 THD + N vs. Frequency, VDD = 5V, Rl=4ohm+33uH, Gain = 18dB A-A THD+N % vs Frequency_4ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.5W 2 1 Green Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 1W 3 1 Red Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 2W 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 9 of 25 April 22, 2015 THD + N vs. Frequency, VDD = 3.6 V, RL = 8 Ω + 66 μH, Gain = 18 dB THD + N vs. Frequency, VDD = 3.6 V, RL = 4 Ω + 33 μH, Gain = 18 dB Audio Precision 04/07/14 14:43:34 THD + N vs. Frequency, VDD = 3.6V, Rl=8ohm+66uH, Gain = 18dB A-A THD+N % vs Frequency_8ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.125W 2 1 Green Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.25W 3 1 Red Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.5W 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz) Audio Precision 04/07/14 14:29:03 THD + N vs. Frequency, VDD = 3.6V, Rl=4ohm+33uH, Gain = 18dB A-A THD+N % vs Frequency_4ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.25W 2 1 Green Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.5W 3 1 Red Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 1W 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 10 of 25 April 22, 2015 THD + N vs. Frequency, VDD = 2.5 V, RL = 8 Ω + 66 μH, Gain = 18 dB THD + N vs. Frequency, VDD = 2.5 V, RL = 4 Ω + 33 μH, Gain = 18 dB Audio Precision 04/07/14 14:39:21 THD + N vs. Frequency, VDD = 2.5V, Rl=8ohm+66uH, Gain = 18dB A-A THD+N % vs Frequency_8ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.0625W 2 1 Green Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.125W 3 1 Red Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.25W 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz) Audio Precision 04/07/14 14:33:12 THD + N vs. Frequency, VDD = 2.5V, Rl=4ohm+33uH, Gain = 18dB A-A THD+N % vs Frequency_4ohm.at27 ColorSweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.125W 2 1 Green Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.25W 3 1 Red Solid 3 Anlr.THD+N Ratio Left OUTPUT POWER 0.5W 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 T H D N 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 11 of 25 April 22, 2015 0.5 1.5 2.5 3.5 2.5 3 3.5 4 4.5 5 5.5 SUPPLY CURRENT (mA) Supply Current vs. Supply Voltage NO LOAD RL = 4ohm+33uH RL = 8ohm+66uH SUPPLY VOLTAGE( V ) 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.5 3 3.5 4 4.5 5 OUTPUT POWER (W) Maximum Output Power vs Supply Voltage , RL=8Ω+33uH, Gain = 18dB 10% SUPPLY VOLTAGE (V)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 12 of 25 April 22, 2015 0.5 1.5 2.5 3.5 2.5 3 3.5 4 4.5 5 OUTPUT POWER (W) Maximum Output Power vs Supply Voltage , RL=3Ω+33uH, Gain = 18dB 10% SUPPLY VOLTAGE (V) 0.5 1.5 2.5 3.5 2.5 3 3.5 4 4.5 5 OUTPUT POWER (W) Maximum Output Power vs Supply Voltage , RL=4Ω+33uH, Gain = 18dB 10% SUPPLY VOLTAGE (V)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 13 of 25 April 22, 2015 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 EFFICIENCY (%) Efficiency vs. Output Power into 8ohm + 66uH VDD 2.5V VDD 3.6V VDD 5V OUTPUT POWER (W) 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 EFFICIENCY (%) Efficiency vs. Output Power into 4ohm + 33uH VDD 2.5V VDD 3.6V VDD 5V OUTPUT POWER (W)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 14 of 25 April 22, 2015 0.0000 50.0000 100.0000 150.0000 200.0000 250.0000 300.0000 350.0000 400.0000 450.0000 SUPPLY CURRENT (mA) Supply Current vs. Output Power into 8ohm+66uH VDD 2.5V VDD 3.6V VDD 5V OUTPUT POWER (W) 0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00 800.00 SUPPLY CURRENT (mA) Supply Current vs. Output Power into 4ohm + 33uH VDD 2.5V VDD 3.6V VDD 5V OUTPUT POWER (W)
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 15 of 25 April 22, 2015 ALC release waveform , VDD 5V Input 0dBV / 3kHz sine Output LC Load 4ohm+30uH Start up time 4ms , VDD 5V Input 0dBV / 1kHz sine Output LC Load 4ohm+30uH
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 16 of 25 April 22, 2015
1.6 Special Feature Description
The NAU8214 offers excellent quantity performance as high efficiency, high output power and low quiescent current. It also provides the following special features.
1.7 Device Protection
The NAU8214 includes device protection for three operating scenarios. They are 1. Thermal Overload 2. Short circuit 3. Supply under voltage
1.7.1 Thermal Overload Protection
When the device internal junction temperature reaches 150°C, the NAU8214 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.
1.7.2 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 are 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.
1.7.3 Supply under Voltage Protection
If the supply voltage drops under 2.1V, the output drivers will be disabled while the NAU8214 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.
1.8 Max Power Limiting feature
The NAU8214 has a unique feature that limits the Maximum output power delivered to the load. This Max power limit is set by using external resistor connected to the dedicated pin PLMT. Once the threshold is set, the NAU8214 will not allow the voltage output more than the set value irrespective of the power supply voltage variations. Because of this output voltage control, the NAU8214 is able to achieve Power limit function for any given load. There are two methods to set the maximum output amplitude threshold (Vout) during the limiting mode. The following equations show the Max output voltage limit in terms of external resistor (RLMT). In equation 1, RLMT is tied to GND, which sets (Vout) as VDD independent, unlike equations two where Vout is proportional to (VDD-1.2V). The maximum peak voltage (Vout) is VDD dependent with offset voltage 1.2V in equation 2. 1. Vout = V with RLMT tied to ground 2. Vout = V with RLMT tied to supply voltage The maximum output power is calculated from the following eq. Pout = √ ) Where R is the Load resistance (Speaker Resistance) If the supply voltage is lower than the pre-set Max Vout voltage, then the output signal will clip to the supply voltage rather than being limited by the power limiter.
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 17 of 25 April 22, 2015
1.8.1 Power limiting VDD independent configuration
0.1uF 0.1uF VDD 10uF 0.1uFPLMT RLMT
1.8.2 Power limiting VDD dependent configuration
0.1uF 0.1uF VDD 10uF 0.1uFPLMT RLMT VDD
1.8.3 ATTACK TIME, HOLD TIME, AND RELEASE TIME
When the input to the NAU8214 exceeds a preset threshold, MPL reduces amplifier gain rapidly until its output settles to a target level. This gain level is maintained for a certain period. If the input does not exceed the threshold again, MPL increases the gain gradually. The attack time is the time taken to reduce the gain from maximum to minimum. The hold time is the time to sustain the reduced gain. The release time is the time taken to increase the gain from minimum to maximum. See below plots for these times.
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 18 of 25 April 22, 2015
1.8.4 Attach time Plot
1.8.5 Hold & Release plots
1.9 Power up and Power down Control
When the supply voltage ramps up, the internal power on reset, circuit is 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 comp lete power up sequence will take about 4ms. The device will power down in about 30µs, when the EN pin is set 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.
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 19 of 25 April 22, 2015
1.10 Application diagram
1.10.1 Single ended input configuration
0.1uF 0.1uF VDD 10uF 0.1uFPLMT R
1.10.2 Differential input configuration
0.1uF 0.1uF VDD 10uF 0.1uFPLMT R
1.11 Component selection
1.11.1 Coupling Capacitors
An ac coupling capacitor (Cin) is used to block the dc content from the input source. The input resistance of the amplifier (Rin) 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
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 20 of 25 April 22, 2015 Where is the desired cut off frequency of the High pass filter. Input Output Cin Rin(Input Resistance) Amplifier
1.11.2 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.
1.12 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.
1.13 Class D without filter
The NAU8214 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 NAU8214 outputs connected to speaker without filter circuit
1.14 Class D with filter
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 21 of 25 April 22, 2015 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.
1.14.1 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 NAU8214 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.
1.14.2 LC filter
The LC filter is used to suppress the low frequency emissions. The following diagra m shows the NAU8214 outputs connected to the speaker with LC filter circuit. RL is the resistance of the speaker coil. OUTLP OUTLN L L C C RL NAU8214 outputs connected to speaker with LC filter
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 22 of 25 April 22, 2015 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 √ is the cutoff frequency The L and C values for differential configuration can be calculated by duplicating the single ended configuration values and substituting RL = 2R.
1.15 NAU8214 EMI performance
The NAU8214 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.
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 23 of 25 April 22, 2015 Package Dimensions 1.16 20 Pin QFN Package TOP VIEW BOTTOM VIEW 1616 15 11
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 24 of 25 April 22, 2015 1.17 8 pin SOP package E 8 5 Control demensions are in milmeters . E
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier NAU8214 Data Sheet Rev1.6 Page 25 of 25 April 22, 2015
Ordering Information
1.18 Nuvoton Part Number Description
VERSION DATE PAGE DESCRIPTION Rev1.0 May, 2013 NA Preliminary Revision Rev 1.1 May, 2013 5 Populated the Power limiting table with resistance and Vout values. Rev1.2 November 2013 6-7 Added attack time, hold time, and release time plots PLM Rev1.3 December 2013 2 and Added new package information Rev 1.4 August 28,2014 13 Added QFN20 Package info Rev1.5 October 27, 2014 7-15 Added Performance graphs. Rev 1.6 April 22, 2015 13-25 Corrected the ordering number for SOP 8 package. Table 2 Version History Important Notice Nuvoton products are not designed, intended, authorized 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: S = 8-pin SOP Package Y = 20-pin QFN Package NAU8214XG Package Material: G = Green Package