LM48100Q

SNAS470D – OCTOBER 2008 – REVISED MARCH 2013

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PCB Layout Guidelines

Minimize trace impedance of the power, ground and all output traces for optimum performance. Voltage loss due

to trace resistance between the LM48100Q and the load results in decreased output power and efficiency. Trace

resistance between the power supply and ground has the same effect as a poorly regulated supply, increased

ripple and reduced peak output power. Use wide traces for power supply inputs and amplifier outputs to minimize

losses due to trace resistance, as well as route heat away from the device. Proper grounding improves audio

performance, minimizes crosstalk between channels and prevents digital noise from interfering with the audio

signal. Use of power and ground planes is recommended.

Place all digital components and route digital signal traces as far as possible from analog components and

traces. Do not run digital and analog traces in parallel on the same PCB layer. If digital and analog signal lines

must cross either over or under each other, ensure that they cross in a perpendicular fashion.

Exposed Dap Mounting Considerations

The LM48100Q HTSSOP-EP package features an exposed die-attach (thermal) pad on its backside. The

exposed pad provides a direct heat conduction path from the die to the PCB, reducing the thermal resistance of

the package. Connect the exposed pad to GND with a large pad and via to a large GND plane on the bottom of

the PCB for best heat distribution.

LM48100QTL Demoboard Bill of Materials

Designator

Quantity

Description

C1

1

10µF ±10% 16V Tantalum Capacitor (B Case) AVX TPSB106K016R0800

C2

1

1µF ±10% 16V X7R Ceramic Capacitor (603) Murata GRM188R71C105KA12D

0.1µF ±10% 16V X7R Ceramic Capacitor (603) Murata GRM188R71C104KA01D

C3, C5

2

Panasonic ECJ-1VB1C104K

C4

1

2.2 µF ±10% 16V X7R Ceramic Capacitor (603) Murata GRM188R71A225KE15D

0.1µF ±10% 50V X5R Ceramic Capacitor (1206) Murata

C6, C7

2

GRM319R71H104KA01D

R1, R2

2

5k

Ω ±5% 1/10W Thick Film Resistor (603) Vishay CRCW06035R1KJNEA

R3

1

1.5k

Ω ±5% 1/10W Thick Film Resistor (603) Vishay CRCW06031K50JNEA

J2

1

16-Pin Boardmount Socket 3M 8516-4500JL

JU1

1

3-Pin Header

JU2–JU12

11

2 Pin Header

LM48100QMH

U1

LM48100QMH (14-Pin HTSSOP-EP)

16

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