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EUA2005 1.5-W Mono Filterless Class-D Audio Power Amplifier
DESCRIPTION
The EUA2005 is a high efficiency, 1.5W mono class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, system cost, and simplifying design. Operating in a single 5V supply, EUA2005 is capable of driving 8 speaker load at a continuous average output of 1.5W/10% THD+N or 1.3W/1% THD+N. The EUA2005 has high efficiency with speaker load compared to a typical class AB amplifier. With a 3.6V supply driving an 8 speaker , the efficiency for a 400mW power level is 84%. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the EUA2005. The gain of EUA2005 is externally configurable which allows independent gain control from multiple sources by summing signals from seperate sources. The EUA2005 is available in DFN packages.
FEATURES
Efficiency at 3.6V With an 8- Speaker: - 84% at 400 mW - 80% at 100 mW Low 2.8-mA Quiescent Current and 0.5-A Shutdown Current 2.5V to 5.5V Wide Supply Voltage Optimized PWM Output Stage Eliminates LC Output Filter Improved PSRR (-72 dB) Eliminates Need for a Voltage Regulator Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor Improved CMRR Eliminates Two Input Coupling Capacitors Internally Generated 250-kHz Switching Frequency Integrated Pop and Click Suppression Circuitry 3mm x 3mm DFN-8 package RoHS compliant and 100% lead(Pb)-free
APPLICATIONS
Ideal for Wireless or Cellular Handsets and PDAs
Typical Application Circuit
Figure1.
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EUA2005
Pin Configurations
Part Number Pin Configurations
EUA2005 DFN-8
Pin Description
PIN DFN-8 I/O DESCRIPTION
SHUTDOWN NC IN+ INVO+ VDD GND VO-
1 2 3 4 5 6 7 8
I
Shutdown terminal (active low logic) No internal connection
I I O I I O
Positive differential input Negative differential input Positive BTL output Power supply High-current ground Negative BTL output
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Ordering Information
Order Number Package Type Marking Operating Temperature range
EUA2005JIR1
DFN-8
xxxx 2005A
-40 C to 85C
EUA2005 1/4
1/4
1/4
1/4
Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type J: DFN
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EUA2005
Absolute Maximum Ratings
u
Supply Voltage, VDD
u u
------------------------------------------------------------------------------------- -0.3 V to 6V
Voltage at Any Input Pin ------------------------------------------------------------------------- -0.3 V to VDD +0.3V Junction Temperature, TJMAX --------------------------------------------------------------------------------------- 150C
u
Storage Temperature Rang, Tstg --------------------------------------------------------------------- -65C to 150C
u
ESD Susceptibility
u
--------------------------------------------------------------------------------------------
2kV 260C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds ----------------------------------------u
Thermal Resistance JA (DFN) ---------------------------------------------------------------------------------------------------- 47C/W
Recommended Operating Conditions Min
Supply voltage, VDD High-level input voltage, VIH 2.5
Max
5.5
Unit
V
SHUTDOWN SHUTDOWN Gain 20V/V (26dB) VDD=2.5V,5.5V,CMRR -49dB
1.6 0 15 0.5 -40
VDD 0.35 VDD-0.8 85
V V k[ V C
Low-level input voltage, VIL Input resistor, RI Common mode input voltage range, VIC Operating free-air temperature, TA
Electrical Characteristics TA = 25C (Unless otherwise noted) Symbol
VOS
Parameter
Output offset voltage (measured differentially) Power supply rejection ratio
Common mode rejection ratio
Conditions
VI= 0V,AV=2 V/V, VDD=2.5V to 5.5V VDD= 2.5V to 5.5V VDD= 2.5V to 5.5V, VIC= VDD/2 to 0.5V, VIC= VDD/2 to VDD -0.8 V VDD= 5.5V, VI= 5.8V VDD= 5.5V, VI= -0.3V VDD= 5.5V, no load
Min
EUA2005 Typ Max.
1 -72 -60 25 -55 -48 100 5 4.3 2.8 2 0.5 700 500 400 >1 3.2 2 4.9
Unit
mV dB dB A A mA
PSRR
CMRR
I IH I IL
I(Q)
High-level input current Low-level input current
Quiescent current
VDD= 3.6V, no load VDD= 2.5V, no load
V (SHUTDOWN ) =0.35V,
I(SD)
Shutdown current
Static drain-source on-state rDS(on) resistance
VDD= 2.5V to 5.5V VDD= 2.5V VDD= 3.6V VDD= 5.5V
V (SHUTDOWN ) =0.4V
A
m
f(sw)
Output impedance in SHUTDOWN Switching frequency Resistance from shutdown toGND
k 300 kHz k
VDD= 2.5V to 5.5V
200
250 300
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Electrical Characteristics TA = 25C ,Gain= 2V/V,RL=8 (Unless otherwise noted) EUA2005 Symbol Parameter Conditions Min Typ Max.
THD+N=10%, VDD= 3.6V f=1kHz, RL=8 PO Output power
Unit
W
VDD= 5V
1.52 0.79 0.39 1.30 0.64 0.30 0.28 0.30 0.28 -60 84 157 VRMS 117 -55 11.5 dB ms dB dB % W
VDD= 2.5V VDD= 5V
THD+N=1%, VDD= 3.6V f=1kHz, RL=8
VDD= 2.5V
Total harmonic distortion THD+N plus noise
VDD= 5V,PO=1W, RL=8, f=1kHz VDD= 3.6V,PO=0.5W, RL=8, f=1kHz VDD= 2.5V,PO=200mW, RL=8, f=1kHz
kSVR SNR
Supply ripple rejection ratio Signal-to-noise ratio
VDD= 3.6V, Inputs f=217 Hz, ac-grounded with V(RIPPLE)=200mVpp CI= 2F VDD= 5V,PO=1W, RL=8 VDD= 3.6V, No weighting f=20Hz to 20kHz,Inputs ac-grounded with A weighting CI= 2F VDD= 3.6V, f=217 Hz VIC=1 VPP VDD= 3.6V
Vn
Output voltage noise
CMRR ZI
Common mode rejection ratio Start-up time from shutdown
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Typical Operating Characteristics
EFFICIENCY vs OUTPUT POWER
100 90
POWER DISSIPATION vs OUTPUT POWER
0.7
0.6
80
PD - Power Dissipation - W
70
0.5
Efficiency - %
60 50 40 30 20 10 0 0.0
VDD=2.5V, RL= 8 ohm + 33uH
VDD=5V, RL=8 ohm+33uH VDD=3.6V, RL=8 ohm + 33uH
0.4
0.3
0.2
VDD=3.6V, RL=8 ohm
0.1
VDD=5V, RL=8 ohm
0.0
0.2 0.4 0.6 0.8 1.0 1.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
PO - Output Power - W
PO - Output Power - W
Figure2.
SUPPLY CURRENT vs OUTPUT POWER
250
Figure3.
SUPPLY CURRENT vs SUPPLY VOLTAGE
5.0
RL= 8 ohm, 33uH
200
VDD=5V
4.5
IDD - Supply Current - mA
IDD - Supply Current -mA
VDD=3.6V
150
4.0
RL=8 ohm,(resistive)
VDD=2.5V
3.5
100
3.0
2.5
50
RL=8 ohm, 33uH NO Load
2.0
0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
1.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5
PO - Output Power - W
VDD - Supply Voltage -V
Figure4.
SHUTDOWN CURRENT vs SHUTDOWN VOLTAGE
2.0
3.0
Figure5.
OUTPUT POWER vs LOAD RESISTANCE PO at 10% THD Gain=2 V/V F=1KHz
2.5
VDD=5V
I(SD) -Shutdown Current - uA
1.5
PO - Output Power - W
2.0
VDD=3.6V
1.5
1.0
VDD=5V VDD=3.6V
0.5
VDD=2.5V
1.0
VDD=2.5V
0.5
0.0 0.0 0.1 0.2 0.3 0.4 0.5
0.0 8 12 16 20 24 28 32
Shutdown Voltage -V
RL - Load Resistance - ohm
Figure6.
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Figure7.
6
EUA2005
OUTPUT POWER vs LOAD RESISTANCE
2.5
OUTPUT POWER vs SUPPLY VOLTAGE
3.0
2.0
PO at 1% THD Gain=2 V/V F=1KHz PO - Output Power -W VDD=5V
GAIN=2V/V F=1KHz
2.5
PO - Output Power - W
2.0
1.5
1.0
VDD=3.6V VDD=2.5V
1.5
1.0
0.5
RL = 8 ohm, 10% THD
0.5
RL= 8 ohm, 1% THD
0.0 8 12 16 20 24 28 32
0.0 2.5 3.0 3.5 4.0 4.5 5.0
RL - Load Resistance - ohm
VCC - Supply Voltage -V
Figure8.
Figure9.
Figure10.
Figure11.
Figure12.
Figure13.
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EUA2005
TOTAL HARMONIC DISTORTION+NOISE vs COMMON MODE INPUT VOLTAGE THD+N - Total Harmonic Distortion + Noise -%
10
f= 1KHz Po=200mW
1
VDD=2.5V
VDD=3.6V VDD=5V
0.1 0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VIC - Common Mode Input Voltage - V
Figure14.
Figure15.
Figure16.
Figure17.
Figure18.
DS2005 Ver 1.1 Nov. 2006
Figure19.
8
EUA2005
SUPPLY RIPPLE REJECTION RATIO vs DC COMMON MODE VOLTAGE
0 -10 -20 -30 -40
Supply Ripple Rejection Ratio - dB
VDD=2.5V
-50 -60 -70 -80 0.0 0.5 1.0 1.5 2.0 2.5
VDD=3.6V VDD=5V
3.0
3.5
4.0
4.5
5.0
DC Common Mode Voltage - V
Figure20.
COMMON-MODE REJECTION RATIO vs COMMON-MODE INPUT VOLTAGE
0
Figure21.
CMRR - Common Mode Rejection Ratio - dB
-10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0 1 2 3 4 5
VDD=2.5V
VDD=3.6V
VDD=5V, Gain=2V/V
VIC - Common Mode Input Voltage - V
Figure22.
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EUA2005
Application Information
Fully Differential Amplifier
Table 1. Typical Component Values
REF DES VALUE
The EUA2005 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier consists of a differential amplifier and a common-mode amplifier. The differential amplifier ensures that the amplifier outputs a differential voltage on the output that is equal to the differential input times the gain. The common-mode feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the common-mode voltage at the input. The fully differential EUA2005 can still be used with a single-ended input; however, the EUA2005 should be used with differential inputs when in a noisy environment, like a wireless handset, to ensure maximum noise rejection. Advantages of Fully Differential Amplifiers Input-coupling capacitors not required: - The fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. For example, if a codec has a midsupply lower than the midsupply of the EUA2005, the common-mode feedback circuit will adjust, and the EUA2005 outputs will still be biased at midsupply of the EUA2005. The inputs of the EUA2005 can be biased from 0.5V to VDD - 0.8 V. If the inputs are biased outside of that range, input-coupling capacitors are required. Midsupply bypass capacitor, C(BYPASS), not required: - The fully differential amplifier does not require a bypass capacitor. This is because any shift in the midsupply affects both positive and negative channels equally and cancels at the differential output. Better RF-immunity: -GSM handsets save power by turning on and shutting off the RF transmitter at a rate of 217 Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier cancels the signal much better than the typical audio amplifier.
Component Selection
RI CS CI (1)
150k ( 0.5%) 1F (+22%,-80%) 3.3nF ( 10%)
(1) CI is only needed for single-ended input or if VICM is not between 0.5 V and VDD - 0.8 V. CI = 3.3 nF (with RI = 150 k) gives a high-pass corner frequency of 321 Hz.
Figure 23. Typical Application Schematic With Differential Input for a Wireless Phone
Figure 24. Typical Application Schematic With Differential Input and Input Capacitors
Figure 23 shows the EUA2005 typical schematic with differential inputs and Figure 24 shows the EUA2005 with differential inputs and input capacitors, and Figure 25 shows the EUA2005 with single-ended inputs. Differential inputs should be used whenever possible because the single-ended inputs are much more susceptible to noise.
Figure 25. Typical Application Schematic With Single-Ended Input
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EUA2005
Input Resistors (RI) The input resistors (RI) set the gain of the amplifier according to equation (1).
2 x 150k
V ---------------------------------(1) V
Gain =
RI
Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with 1% matching can be used with a tolerance greater than 1%. Place the input resistors very close to the EUA2005 to limit noise injection on the high-impedance nodes. For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the EUA2005 to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. Decoupling Capacitor (CS)
Input Capacitors (CI) The EUA2005 does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 V to VDD - 0.8 V (shown in Figure 23). If the input signal is not biased within the recommended common -mode input range, if needing to use the input as a high pass filter (shown in Figure 24), or if using a single-ended source (shown in Figure 25), input coupling capacitors are required. The input capacitors and input resistors form a high-pass filter with the corner frequency, fC, determined in equation (2).
fc = 1 (2R I C I ) --------------------------------------------(2)
The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. Equation (3) is reconfigured to solve for the input coupling capacitance.
CI = 1
(2R I f c )
--------------------------------------------(3)
The EUA2005 is a high-performance class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically1 F, placed as close as possible to the device VDD lead works best. Placing this decoupling capacitor close to the EUA2005 is very important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 10F or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device.
If the corner frequency is within the audio band, the capacitors should have a tolerance of 10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. For a flat low-frequency response, use large input coupling capacitors (1 F). However, in a GSM phone the ground signal is fluctuating at 217 Hz, but the signal from the codec does not have the same 217 Hz fluctuation. The difference between the two signals is amplified, sent to the speaker, and heard as a 217 Hz hum.
Summing Input Signals Most wireless phones or PDAs need to sum signals at the audio power amplifier or just have two signal sources that need separate gain. The EUA2005 makes it easy to sum signals or use separate signal sources with different gains. Many phones now use the same speaker for the earpiece and ringer, where the wireless phone would require a much lower gain for the phone earpiece than for the ringer. PDAs and phones that have stereo headphones require summing of the right and left channels to output the stereo signal to the mono speaker.
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Summing Two Differential Input Signals Two extra resistors are needed for summing differential signals (a total of 5 components). The gain for each input source can be set independently (see equations (4) and (5), and Figure 26).
Gain1 =
Summing a Differential Input Signal and a Single-Ended Input Signal
VO 2 x 150 k V -----------------------(4) = V R I1 VI1 VO 2 x 150 k V -----------------------(5) = V R I2 VI 2
Gain 2 =
Figure 27 shows how to sum a differential input signal and a single-ended input signal. Ground noise can couple in through IN+ with this method. It is better to use differential inputs. The corner frequency of the single-ended input is set by CI2, shown in equation (8). To assure that each input is balanced, the single-ended input must be driven by a low-impedance source even if the input is not in use V 2 x 150 k V ------------------------ (6) Gain1 = O = V R I1 VI1
Gain 2 =
If summing left and right inputs with a gain of 1 V/V, use RI1 = RI2 = 300 k[ . If summing a ring tone and a phone signal, set the ring-tone gain to Gain 2 = 2 V/V, and the phone gain to Gain 1 = 0.1 V/V. The resistor values would be. . . RI1=3M[ , and=RI2=150k[
VO 2 x 150 k V -----------------------(7) = R I2 V VI 2
1
C I2 =
(2R I2 f c 2 )
-----------------------------------------(8)
If summing a ring tone and a phone signal, the phone signal should use a differential input signal while the ring tone might be limited to a single-ended signal. Phone gain is set at gain 1 = 0.1 V/V, and the ring-tone gain is set to gain 2 = 2 V/V, the resistor values would be... RI1=3M[ , and=RI2=150k[ The high pass corner frequency of the single-ended input is set by CI2. If the desired corner frequency is less than 20 Hz...
C I2 >
1 (2150 k 20 Hz ) --------------------------------(9)
Figure 26. Application Schematic With EUA2005 Summing Two Differential Inputs
C I 2 > 53 P F -----------------------------------------------(10)
Figure 27. Application Schematic With EUA2005 Summing Input and Single-Ended Input Signals
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EUA2005
Summing Two Single-Ended Input Signals
Four resistors and three capacitors are needed for summing single-ended input signals. The gain and corner frequencies (fc1 and fc2) for each input source can be set independently (see equations (11) through (14), and Figure 28). Resistor, RP, and capacitor, CP, are needed on the IN+ terminal to match the impedance on the IN- terminal. The single-ended inputs must be driven by low impedance sources even if one of the inputs is not outputting an ac signal.
Gain1 =
VO 2 x 150 k V = V ---------------------(11) R I1 VI1 VO 2 x 150 k V ---------------------(12) = V R I2 VI 2
1
Gain 2 = C I1 = C I2 =
(2R I1f c1 ) -----------------------------------------(13) (2R I2 f c 2 ) -----------------------------------------(14)
R I1 x R I 2
1
CP = C I1 + C I 2 -------------------------------------------(15) RP =
(R I1 + R I2 ) ------------------------------------- (16)
Figure 28. Application Schematic With EUA2005 Summing Two Single-Ended Input
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EUA2005
Packaging Information
DFN-8
NOTE 1. All dimensions are in millimeters, is in degrees 2. M: The maximum allowable corner on the molded plastic body corner 3. Dimension D does not include mold protrusions or gate burrs. Mold protrusions and gate burrs shall not exceed 0.15mm per side 4. Dimension E does not include interterminal mold protrusions or terminal protrusions. Interminal mold protrusions and/or terminal protrusions shall not exceed 0.20mm per side 5. Dimension b applies to plated terminals. Dimension A1 is primarily Y terminal plating, but may or may not include a small protrusion of terminal below the bottom surface of the package 6. Burr shall not exceed 0.060mm 7. JEDEC MO-229
SYMBOLS A A1 A3 b D D1 E E1 e L aaa bbb ccc M
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MIN. 0.70 0 -----0.20 2.85 -----2.85 ----------0.25 ---------------------12
DIMENSIONS IN MILLIMETERS NOM. MAX. 0.80 0.90 0.015 0.03 0.20 REF -----0.30 0.40 3.00 3.15 2.30 BSC -----3.00 3.15 1.50 BSC -----0.65 BSC ----0.35 0.45 0.25 -----0.10 -----0.10 ----------0.05 -----0
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