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National Semiconductor LM4681, User Manual, Page: 6 / 13

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National Semiconductor LM4681 User Manual Download Page 6

Bill of Materials

Designator

Description

Package

Value *

Notes

C1

Polarized Capacitor (Surface Mount)

CC3225–1210 (Surface Mount)

10µF

25V, Tantalum

C2

Polarized Capacitor (Surface Mount)

CC2012–0805 (Surface Mount)

1.0µF

10V, Tantalum

C3

Polarized Capacitor (Surface Mount)

CC2012–0805 (Surface Mount)

1.0µF

10V, Tantalum

C4

Polarized Capacitor (Surface Mount)

CC4532–1812 (Surface Mount)

100µF

10V, Tantalum

C5

Polarized Capacitor (Surface Mount)

CC4532–1812 (Surface Mount)

100µF

10V, Tantalum

C6

Polarized Capacitor (Surface Mount)

CC3225–1210 (Surface Mount)

10µF

25V, Tantalum

C7

Capacitor

CC3216–1206 (Surface Mount)

4.7µF

50V, Ceramic

C8

Capacitor

CC2013–0805 (Surface Mount)

1.0µF

50V, Ceramic

C9

Capacitor

CC3216–1206 (Surface Mount)

10µF

10V, Tantalum

C10

Capacitor

CC2013–0805 (Surface Mount)

270nF

50V, Ceramic

C11

Capacitor

CC2013–0805 (Surface Mount)

270nF

50V, Ceramic

C12

Capacitor

CC2013–0805 (Surface Mount)

270nF

50V, Ceramic

C13

Capacitor

CC2013–0805 (Surface Mount)

1.0µF

50V, Ceramic

C14

Capacitor

CC2013–0805 (Surface Mount)

1.0µF

50V, Ceramic

C15

Capacitor

CC2013–0805 (Surface Mount)

1µF

50V, Ceramic

C16

Capacitor

CC2013–0805 (Surface Mount)

0.1µF

50V, Ceramic

C17

Capacitor

CC2013–0805 (Surface Mount)

270nF

50V, Ceramic

C18

Capacitor

CC2013–0805 (Surface Mount)

270nF

50V, Ceramic

C19

Capacitor

CC2013–0805 (Surface Mount)

270nF

50V, Ceramic

C20

Capacitor

CC3216–1206 (Surface Mount)

4.7µF

50V, Ceramic

C21

Capacitor

CC2013–0805 (Surface Mount)

100nF

50V, Ceramic

C22

Capacitor

CC2013–0805 (Surface Mount)

100nF

50V, Ceramic

J1

3–Conductor Headphone Jack

STEREO HEADPHONE JACK (3.5MM)

JP1

Header, 2–Pin

HDR1X2

JP2

Header, 2–Pin

HDR1X2

JP3

Header, 2–Pin

HDR1X2

JP4

Header, 2–Pin

HDR1X2

JP5

Header, 2–Pin

HDR1X2

JP6

Header, 2–Pin

HDR1X2

JP7

Header, 3–Pin, Dual row

HDR2X3

JP8

Header, 3–Pin

HDR1X3

L1

Inductor

SMT_INDUCTOR

27nH

L2

Inductor

SMT_INDUCTOR

27nH

L3

Inductor

SMT_INDUCTOR

27nH

L4

Inductor

SMT_INDUCTOR

27nH

R1

Resistor

CC2013–0805

100k

5%

R2

Resistor

CC2013–0805

1k

5%

R3

Resistor

CC2013–0805

1k

5%

R4

Resistor

CC2013–0805

100k

5%

*

Capacitor values in µF

AN-1488

www.national.com

6

Summary of Contents for LM4681

Page 1: ...l to jumpers JP4 and JP2 Apply the source s signal and ground to the IN1 pin and the GND pin respectively Connect a load 8Ω between the pins on JP5 and another load between the pins on JP3 Apply power Make measurements Plug in a pair of head phones Enjoy Introduction To help the user investigate and evaluate the LM4681 s performance and capabilities a fully populated demonstra tion board is availa...

Page 2: ...area The LM4681 features a shutdown mode for micropower dissipation an internal thermal shutdown protection mecha nism and output stage fault detect and current limit protec tion Operating Conditions Temperature Range 40 C TA 85 C Amplifier Power Supply Voltage 9 0V VDD 15 5V Board Features The LM4681 demonstration board has all of the necessary connections using 100mil headers to apply the power ...

Page 3: ...Schematic Continued 20195908 Figure 2 The LM4681 Demonstration Board Schematic AN 1488 www national com 3 ...

Page 4: ...age is used connect this supply s positive voltage source to the JP6 pin labeled I2CVDD and the supply s ground source to the pin labeled GND If no external supply is used leave this jumper s pins unconnected JP7 This header is used for the I2 C signal inputs JP7 pin 1 is for an I2 CVDD that is generated by the I2 C signal source JP7 pin 2 is for the SCL signal JP7 pin 3 is for GND JP7 pin 4 is fo...

Page 5: ... can be set to 1 or 0 The software will force the I2 C interface board to apply a logic low or logic high to the LM4681 s ADR pin according to the radio button that is selected The LM4681 will respond to either of the ad dresses selected in the software s Address Bit control PCB Layout Guidelines This section provides general practical guidelines for PCB layouts that use various power and ground t...

Page 6: ...CC2013 0805 Surface Mount 1 0µF 50V Ceramic C14 Capacitor CC2013 0805 Surface Mount 1 0µF 50V Ceramic C15 Capacitor CC2013 0805 Surface Mount 1µF 50V Ceramic C16 Capacitor CC2013 0805 Surface Mount 0 1µF 50V Ceramic C17 Capacitor CC2013 0805 Surface Mount 270nF 50V Ceramic C18 Capacitor CC2013 0805 Surface Mount 270nF 50V Ceramic C19 Capacitor CC2013 0805 Surface Mount 270nF 50V Ceramic C20 Capaci...

Page 7: ...ration board Figure 4 is the silkscreen that shows parts location Figure 5 is the top layer Figure 6 is the upper inner layer Figure 7 is the lower inner layer Figure 8 is the bottom layer 20195909 Figure 4 Top Silkscreen Shown 2 6X actual size 20195910 Figure 5 Top Layer Shown 2 6X actual size AN 1488 www national com 7 ...

Page 8: ...Demonstration Board PCB Layout Continued 20195911 Figure 6 Upper Middle Layer Shown 2 6X actual size 20195912 Figure 7 Lower Middle Layer Shown 2 6X actual size AN 1488 www national com 8 ...

Page 9: ...Demonstration Board PCB Layout Continued 20195913 Figure 8 Bottom Layer Shown 2 6X actual size AN 1488 www national com 9 ...

Page 10: ... mode THD N versus Frequency performance curves at VDD 12V are shown in Figure 11 and Figure 12 respectively 20195914 RL 8Ω fIN 1kHz VDD 12V Figure 9 Class D Amplifier THD N vs Output Power 20195915 RL 32Ω fIN 1kHz VDD 12V Figure 10 Class AB Headphone Amplifier THD N vs Output Power 20195916 RL 8Ω fIN 1kHz VDD 12V PO 1W Figure 11 Class D Amplifier HD N vs Frequency 20195917 RL 32Ω fIN 1kHz VDD 12V...

Page 11: ...in the two internal I2 C control registers Table A1 LM4681 I2 C SPI Control Register Addressing and Data Format Chart B7 B6 B5 B4 B3 B2 B1 B0 I2 C Address 1 1 0 1 1 0 ADR 0 Mode Control Register 0 X 0 X X X 0 Mute Active 0 Shutdown Active Volume Control Register See Table 4 1 0 0 V4 V3 V2 V1 V0 AN 1488 www national com 11 ...

Page 12: ... 1 0 0 0 25 94 9 03 0 1 0 0 1 22 94 6 03 0 1 0 1 0 20 94 4 03 0 1 0 1 1 18 94 2 03 0 1 1 0 0 16 94 0 03 0 1 1 0 1 14 94 1 97 0 1 1 1 0 12 94 3 97 0 1 1 1 1 10 94 5 97 1 0 0 0 0 8 94 7 97 1 0 0 0 1 6 94 9 97 1 0 0 1 0 4 94 11 97 1 0 0 1 1 2 94 13 97 1 0 1 0 0 0 94 15 97 1 0 1 0 1 1 06 17 97 1 0 1 1 0 3 06 19 97 1 0 1 1 1 6 06 22 97 1 1 0 0 0 7 07 23 97 1 1 0 0 1 8 06 24 97 1 1 0 1 0 9 06 25 97 1 1 ...

Page 13: ...user 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers CSP 9 111C2 and Banned Substances and Materials ...

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