evaluation board for the aat5101 2.5w mono filter-free...

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EV167EVALUATION BOARD DATA SHEET

Evaluation Board for the AAT51012.5W Mono Filter-Free Class D Audio Power Amplifier

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012

Introduction The AAT5101 is a high efficiency mono filter-free Class D audio power amplifier with fully differential architecture and BTL (Bridge Tied Load) output. The AAT5101 evaluation board is provided for demonstration and evaluation of the AAT5101. The board contains one power decoupling capacitor, two input capacitors, and two input resistors in the 0603 package suitable for portable device applications. The PCB layout has been optimized to achieve high SNR and low THD+N with the 1.45mm x 1.45mm WCSP-9 package.

The "Audio Demonstration" section of this document is intended to help the user to start the evaluation board for dem-onstration purposes. The "Amplifier Gain, THD+N, and Efficiency Evaluation” section explains procedures to measure amplifier gain, THD+N, and efficiency using the AAT5101 evaluation board. The AAT5101 evaluation board is shown in Figure 1; Figures 2 and 15 depict the AAT5101 evaluation board schematic and layout. For additional information, please consult the AAT5101 product datasheet.

Board Picture

a: Top Layer b: Bottom Layer

Figure 1: AAT5101 Evaluation Board.

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Schematic and BOM

R1150kΩ

R2150kΩ

C10.1µF

C20.1µF

C3

4.7µF

C4VDD

IN+

IN-

VO-

VO+

SD

VDD

AAT5101

U1

VDD

Shutdown

Audio In

PVDDGND

1

2

3

J1

12

J4

In-

In+

Out+Out-

Audio Out

GND

GND

GND

Figure 2: AAT5101 Evaluation Board Schematic.

Ref Part Description PCB FootprintU1 AAT5101 Class D Audio Amplifier WCSP-9

R1, R2 SMD Resistor 150kΩ 0603C1, C2 Ceramic Capacitor 0.1µF, 50V, X7R 0603

C4 Ceramic Capacitor 4.7µF, 6.3V, X5R 0603C3 Not Populated

Table 1: AAT5101 Evaluation Board Build of Materials (BOM).

Audio Demonstration

Demonstration Equipment1. Unit Under Test: AAT5101 Evaluation Board.2. Power Supply: DC Power Supply, Battery, USB or equivalent.3. Audio Source: Notebook, MP3, DVD Player or equivalent.4. Speaker: 8/4Ω Speaker.

Set-up and Demonstration1. Power supply is connected to J2. 2. Differential inputs are connected to IN+ and IN- of J3 as illustrated in Figure 3. If input is single-ended, ground one

of two input pins of J3 by tying it to the center pin of J3 as illustrated in Figure 4.3. Connect the speaker to J4.4. Configure all connections as shown in Figures 3 and 4.5. Make sure the signal source is set to minimum and the SHUTDOWN jumper is at OFF position, then turn on the

power supply.6. Set the SHUTDOWN jumper to the ON position to turn on the device.7. Increase the input signal to your favorite volume.

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Differential Audio Source

+

-G

DC Power Supply /Battery/USB etc.

2.1V to 5.5V

Figure 3: AAT5101 Evaluation Board Demo Set-up for Differential Audio Input.

Audio SourceNB/MP3 etc.

R

LG

DC Power Supply /Battery/USB etc.

2.1V to 5.5V

Figure 4: AAT5101 Evaluation Board Demo Set-up for Single-Ended Audio Input.

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Amplifier Gain, THD+N, and Efficiency Evaluation

Evaluation Equipment1. AAT5101 Evaluation Board.2. Power Supply.3. Audio Analyzer.4. One Voltage Meter and Two Current Meters.5. 30kHz Low Pass Filter.

A 30kHz RC low pass filter (100Ω, 47nF) is required on each output even if the analyzer has an internal low-pass filter. An RC low pass filter (1kΩ, 4.7nF) is required for efficiency measurement.

Amplifier Gain and THD+N Measurement

Amplifier Gain and THD+N Measurement Set-up1. Connect the power supply to J2. 2. Differential inputs are connected to IN+ and IN- of J3 as shown in Figure 5. If input is single-ended, ground one of

two input pins of J3 by tying it to the center pin of J3 as shown in Figure 6.3. Connect a 5W power resistor load of 8/4Ω to OUT+ and OUT- of J4. 4. Connect the low pass filter to the resistor load.5. The differential outputs of low pass filter are connected to audio analyzer AC IN+ and IN-.

2.1V to 5.5V

Power Supply

30 kHz LPFAudio Analyzer Part A

GEN-FGEN-L

GEN OUTTHD+N

&Voltage

Audio Analyzer Part B

AC IN

RL

Figure 5: AAT5101 Amplifier Gain and THD+N Measurement Set-up for Differential Input.

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2.1V to 5.5V

Power Supply

30 kHz LPFAudio Analyzer Part A

GEN-FGEN-L

GEN OUTTHD+N

&Voltage


AC IN

RL

Figure 6: AAT5101 Amplifier Gain and THD+N Measurement Set-up for Single-Ended Input.

Amplifier Gain Measurement1. Configure all connections as shown in Figures 5 and 6.2. Make sure signal source is set to minimum and the SHUTDOWN jumper is in the OFF position, then turn on the

power supply.3. Set the SHUTDOWN jumper at the ON position to turn on the device.4. Tune the input frequency to 1kHz, increase input amplitude to a middle point (output THD+N should be less than

1% at this point), measure input voltage (VIN) and output voltage (VOUT) by audio analyzer. Calculate the amplifier gain (G) using the following equation:

G = = VOUT

VIN

300kΩRI

Where RI =150kΩ is 1% standard metal film resistor connected to R1 and R2 of the board.

THD+N vs. Output Power Measurement1. Configure all connections as shown in Figures 5 and 6.2. Make sure signal source is set to minimum and the SHUTDOWN jumper is at OFF position, then turn on the power

supply.3. Set the SHUTDOWN jumper at the ON position to turn on the device.4. Tune the input frequency to 1kHz, increase input amplitude until output THD+N = 10%, measure output THD+N

and output voltage (VOUT) by audio analyzer. Calculate the output power (POUT) using the following equation:

POUT = (VOUT)2

RL

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THD+N vs. Output Power(f = 1kHz; RL = 8Ω)

Output Power (W)

THD

+N (%

)

0.1 10.01 100.1

1

10VDD = 5.0VVDD = 3.6V VDD = 2.5VVDD = 2.1V

THD+N vs. Output Power(f = 1kHz; RL = 4Ω)

Output Power (W)

THD

+N (%

)

0.1 10.01 100.1

1

10VDD = 5.0VVDD = 3.6V VDD = 2.5VVDD = 2.1V

Figure 7: THD+N vs. Output Power @ RL = 8Ω. Figure 8: THD+N vs. Output Power @ RL = 4Ω.

THD+N vs. Frequency Measurement1. Configure all connections as shown in Figures 5 and 6.2. Make sure the signal frequency is set to 20Hz and the SHUTDOWN jumper is in the OFF position, then turn on the

power supply3. Set the SHUTDOWN jumper to the ON position to turn on the device.4. Increase frequency to 20kHz. Measure output THD+N vs. frequency.

THD+N vs. Frequency(CI = 2.2µF; RL = 8Ω)

Frequency (Hz)

THD

+N (%

)

10 100 1000 10000 1000000.01

0.1

1

10VDD = 5V, POUT = 1WVDD = 3.6V, POUT = 500mWVDD = 2.5V, POUT = 200mWVDD = 2.1V, POUT = 150mW

THD+N vs. Frequency(CI = 2.2µF; RL = 4Ω)

Frequency (Hz)

THD

+N (%

)

10 100 1000 10000 1000000.01

0.1

1

10VDD = 5.0V, POUT = 1.5WVDD = 3.6V, POUT = 800mWVDD = 2.5V, POUT = 300mWVDD = 2.1V, POUT = 200mW

Figure 9: THD+N vs. Frequency @ RL = 8Ω. Figure 10: THD+N vs. Frequency @ RL = 4Ω.

Efficiency Measurement

Efficiency Measurement Set-up1. Connect the power supply to J2 through the current meter.2. Connect the voltage meter to VDD and GND on the board.3. Connect the differential inputs to IN+ and IN- of J3 as shown in Figure 11. If input is single-ended, ground one of

two input pins of J3 by tying it the center pin of J3 as shown in Figure 12.4. Connect a 5W power resistor of 8/4Ω and a 33µH inductor in series with the current meter as load to OUT+ and

OUT- of J4. 5. Connect the low pass filter to the load. 6. The differential outputs of the low pass filter are connected to the audio analyzer AC IN+ and AC IN-.

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Power Supply

2.1V to 5.5V

Audio Analyzer Part A

CurrentMeter

VoltageMeter

RL

L

CurrentMeter

THD+N &Voltage


GEN-FGEN-L

AC INGEN OUT

30 kHz LPF

Figure 11: AAT5101 Efficiency Measurement Set-up for Differential Input.

Power Supply

2.1V to 5.5V

Audio Analyzer Part A

CurrentMeter

VoltageMeter

RL

L

CurrentMeter

THD+N &Voltage


GEN-FGEN-L

AC INGEN OUT

30 kHz LPF

Figure 12: AAT5101 Efficiency Measurement Set-up for Single-Ended Input.

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Efficiency vs. Output Power Measurement1. Configure all connections as shown in Figures 11 and 12.2. Make sure signal source is set to minimum and the SHUTDOWN jumper is at OFF position then turn on the power

supply.3. Set the SHUTDOWN jumper at the ON position to turn on the device.4. Tune the input frequency to 1kHz, increase input amplitude until output THD+N = 10%, then measure the supply

voltage (VS), supply current (IS), output voltage (VOUT) and output current (IOUT) to calculate the efficiency (η) by the following equation:

η = VOUT · IOUT

VS · IS

Efficiency vs. Output Power(f = 1kHz; RL = 8Ω + 33µH)

Output Power (W)

Effic

ienc

y (%

)

0 0.3 0.6 0.9 1.2 1.50

10

20

30

40

50

60

70

80

90

100

VDD = 5.0VVDD = 3.6V VDD = 2.5VVDD = 2.1V

Efficiency vs. Output Power(f = 1kHz; RL = 4Ω + 33µH)

Output Power (W)

Effic

ienc

y (%

)

0 0.5 1.0 1.5 2.0 2.50

10

20

30

40

50

60

70

80

90

VDD = 5.0VVDD = 3.6V VDD = 2.5VVDD = 2.1V

Figure 13: Efficiency vs. Output Power Figure 14: Efficiency vs. Output Power @ RL = 8Ω + 33µF @ RL = 4Ω + 33µF

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Evaluation Board PCB Layout

a: Top Layer b: Ground Layer

c: Power Layer d: Bottom Layer

Figure 15: AAT5101 Evaluation Board PCB Layouts.

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Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.

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evaluation board for the aat5101 2.5w mono filter-free...

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