NAU82011VG ETC2
Document overview
- Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 17
Technical content
NAU82011VG Datasheet Rev1.1 Page 1 of 17 Jan, 2013 NAU82011VG 3.1W Mono Filter-Free Class-D Audio Amplifier
1 Description
The NAU82011VG is a mono high efficiency filte r-free Class-D audio amplifier with variable gain, which is capable of driving a 4Ω load with up to 3 .1W output power. This device provides chip enable pin with extremely low standby current and fast start-up time of 4ms. The NAU82011VG is ideal for battery drive n portable applications , as it has advanced features 9 1% efficiency, low single-ended or differential mode. NAU82011VG is available in Miniature 9 ball WL-CSP (1.17mm x 1.19mm in 0.4mm pitch). Key Features Low Quiescent Current: 1.25mA at 3.6V 1.8mA at 5V Powerful Mono Class-D Amplifier: 3.1W (4Ω @ 5V, 10% THD+N) 2.38W (4Ω @ 5V, 1% THD+N) 1.70W (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 1.17mm x 1.19mm WL-CSP (0.4mm Pitch)
Applications
Smartphones Tablet PCs Personal Navigation Devices VDD VSS Current / Thermal Protection VIN Class D Modulator Output Driver VIP NAU82011VG EN Click / Pop Suppression Figure 1: NAU82011VG Block Diagram
NAU82011VG Datasheet Rev1.2 Page 2 of 17 Oct, 2015
2 Pin out (Top View)
Part Number Dimension Package Package Material NAU82011VG 1.17mm x 1.19mm 9-ball WL-CSP (0.4mm pitch) Green
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; Low = Power Down) C3 VOUTP Analog Output Positive BTL Output Table 1: NAU82011VG Pin description VIP VDD VIN EN VSS VSS VOUTN VOUTP 1 2 3 A B C VDD
NAU82011VG Datasheet Rev1.2 Page 3 of 17 Oct, 2015
Electrical Characteristics
Conditions: EN = VDD = 5V, VSS = 0V, Av = 6dB, R1 = 150kΩ, ZL = ∞, Bandwidth = 20Hz to 22kHz, 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 3.10 W VDD = 3.6V 1.61 ZL = 4Ω + 33µH THD + N = 1% VDD = 5.0V 2.38 VDD = 3.6V 1.30 ZL = 8Ω + 68µH THD + N = 10% VDD = 5.0V 1.70 VDD = 3.6V 0.85 ZL = 8Ω + 68µH THD + N = 1% VDD = 5.0V 1.38 VDD = 3.6V 0.69 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 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
NAU82011VG Datasheet Rev1.2 Page 4 of 17 Oct, 2015 Electrical Characteristics (continued) Conditions: EN = VDD = 5V, VSS = 0V, Av = 6dB, R1 = 150kΩ , ZL = ∞, Bandwidth = 20Hz to 22kHz, TA = 25 oC Parameter Symbol Comments/Conditions Min Typ Max Units Normal Operation Quiescent Current Consumption IQUI VDD = 3.6V 1.25 mA VDD = 5V 1.8 mA Shut Down Current IOFF EN = 0 0.1 µA Oscillator Frequency fOSC 300 kHz Efficiency η WL-CSP 91 % Start Up Time Tstart 4 msec Output Offset Voltage VOS ±1 mV Common Mode Rejection Ratio CMRR1 fIN = 1kHz 80 dB Click-and-Pop Suppression 1Hz Shutdown (ZL=8Ω) 83 dBV Power Supply Rejection Ratio PSRR DC PSRR 90 dB AC PSRR VRIPPLE = 0.2Vpp@1kHz 65 dB Noise Performance VDD = 3.6V (A-weighted) 20 µVRMS Note 1: The CMRR measurement is limited by the device as well as external resistors (R1) matching. 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. 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
NAU82011VG Datasheet Rev1.2 Page 5 of 17 Oct, 2015 Test Set up VDD Audio Precision Output Audio Precision Input 30kHz low pass RC filterNAU82011VG ZL 0.1uF 0.1uF Note: The 30kHz low pass RC filter is implemented by using R= 1k Ohm and C = 4.7nF
NAU82011VG Datasheet Rev1.2 Page 6 of 17 Oct, 2015
5 Typical Operating Characteristics
Conditions: EN = VDD = 5V, VSS = 0V, Av = 6dB (R=150kΩ) , ZL = ∞, Bandwidth = 20Hz to 22kHz, TA = 25 oC, unless otherwise noted 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 50mW Pout 250mW Pout 1W 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Freqiency (Hz) THD+N vs Frequency Pout 25mW Pout 125mW Pout 500mW 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 15mW Pout 75mW Pout 200mW 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 100mW Pout 500mW Pout 2W
NAU82011VG Datasheet Rev1.2 Page 7 of 17 Oct, 2015 Note: 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. 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 50mW Pout 250mW Pout 1W 0.001 0.01 0.1 20 200 2000 20000 THD+N (%) Frequency (Hz) THD+N vs Frequency Pout 30mW Pout 150mW Pout 400mW 0.001 0.01 0.1 100 0.01 0.1 1 10 THD+N(%) Output Power (W) THD+N vs Output Power VDD VDD 3.6V VDD 2.5V ZL=8ohm+68uH 0.001 0.01 0.1 100 0.01 0.1 1 10 THD+N(%) Output Power (W) THD+N vs output Power VDD VDD 3.6 VDD 2.5 ZL=4ohm+33uH
NAU82011VG Datasheet Rev1.2 Page 8 of 17 Oct, 2015 100 0 0.5 1 1.5 2 Efficiency (%) Output power (W) Efficiency vs Output power VDD 5V VDD 3.6V VDD 2.5V 100 0 1 2 3 4 Efficiency (%) Output power (W) Efficiency vs Output power VDD 5V VDD 3.6V VDD 2.5V 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0 0.5 1 1.5 2 Supply current (A) Output power (W) Supply current vs Output power VDD 5V VDD 3.6V VDD 2.5V 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 1 2 3 4 Supply current (A) Output power (W) Supply Current vs Output power VDD 5V VDD 3.6V VDD 2.5V
NAU82011VG Datasheet Rev1.2 Page 9 of 17 Oct, 2015 Note : The above PSRR plots are captured with input capacitors 2.2uF -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 20 200 2000 20000 PSRR [dB] Frequency [Hz] PSRR vs Frequency VDD 2.5V VDD 3.6V VDD 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 2.5V VDD 3.6V VDD 5V ZL = 4Ω + 33μH -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
NAU82011VG Datasheet Rev1.2 Page 10 of 17 Oct, 2015
6 Special Feature Description
The NAU82011VG offers excellent quantity performance including high efficiency, high output power and low quiescent current. It also provides the following special features.
6.1 Device Protection
The NAU82011VG 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 NAU82011VG 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 ed for the short circuit. If the short circuit is still present, the output drivers are disabled after 16.7 µs. 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 NAU82011VG control circuitry still operates. This will avoid the battery supply being dragged down too low before the host processor can safely shut down the devices in the system. If the supply drops further below 1.6V, the internal power on reset is activated and puts the entire device in power down state.
6.1.4 Power up and Power down Control
When the supply voltage ramps up, the internal power on reset circuit gets triggered. At t his 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.
NAU82011VG Datasheet Rev1.2 Page 11 of 17 Oct, 2015
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
NAU82011VG Datasheet Rev1.2 Page 12 of 17 Oct, 2015
7.2 Component selection
7.2.1 Input resistors for Gain
NAU82011VG 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 ) ( )
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 Where 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.
NAU82011VG Datasheet Rev1.2 Page 13 of 17 Oct, 2015 Recommended PCB footprint for NAU82011VG The recommended PCB footprint for NAU82011VG is shown in the above diagram.
7.4 Class D without filter
The NAU82011VG 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 filterless 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 NAU82011VG 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.
NAU82011VG Datasheet Rev1.2 Page 14 of 17 Oct, 2015
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 NAU82011VG 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.
7.5.2 LC filter
The LC filter is used to suppress the low frequency emissions. The following diagram shows the NAU82011VG outputs connected to the speaker with LC filter circuit. RL is the resistance of the speaker coil. VOUTP VOUTN L C C RL L NAU82011VG outputs connected to speaker with LC filter
NAU82011VG Datasheet Rev1.2 Page 15 of 17 Oct, 2015 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 ( ) 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.
NAU82011VG Datasheet Rev1.2 Page 16 of 17 Oct, 2015
8 Package Dimensions
8.1 9 ball WL-CSP (0.4mm pitch)(1.17mm x1.19mm)
NAU82011VG Datasheet Rev1.2 Page 17 of 17 Oct, 2015
9 Ordering Information
Nuvoton Part Number Description Version History VERSION DATE PAGE DESCRIPTION NAU82011 Datasheet Rev1.0 Oct, 2012 NA Revision1.0 NAU82011VG Datasheet Rev1.1 Jan, 2013 NA 1. Removed MSOP 8 package information 2. Changed package material from pb-free to Green NAU82011 Datasheet Rev1.2 Oct, 2015 1, 7 Updated 4omh loading power at THD+N=1% and 10% Put new THD vs Po plot Table 1: 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: V = 9-ball WL-CSP Package NAU82011VG Package Material: G = Green