SM6800A

NIPPON PRECISION CIRCUITS INC.—1

Class-D Mono Amplifier for Mobile Telephones

OVERVIEW

The SM6800A is an analog-input, class-D mono amplifier. Class-D operation provides high efficiency and low

power consumption. The device also incorporates a selectable real-time operation dynamic range compression

function that effectively suppresses the distortion in the saturation level region output by soft-clipping, boost-

ing the average sound pressure from the speaker during playback. It also incorporates an input equalizer pin for

output speaker frequency characteristics adjustment. These features make the device ideal for use in mobile

telephones and speaker applications requiring miniaturization and high-efficiency. The output stage has a BTL

output configuration where the output waveform inverts only the modulation components, enabling direct drive

connection, without using an LC filter, to a dynamic speaker. The device is available in miniature 20-pin QFN

packages, and requires only a peripheral chip capacitor to form a miniature amplifier circuit.

FEATURES

I

Operating supply voltage: 2.7 to 4.3V

I

I

I

Output fundamental frequency: 125kHz

I

Gain

• 4.5dB (Normal)

• 12dB

to

4.5dB

automatic

adjustment

in

response to the input level

(Dynamic range compression mode)

I

Silicon-gate CMOS process

I

Package: 20-pin QFN

APPLICATIONS

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Cellular phone

I

PDA

I

Digital still camera

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

Device

Package

SM6800AB

20-pin QFN

67 89 10

20 19 18 17 16

15

14

13

12

11

1

2

3

4

5

VDD3

OUTP

VSS2

OUTN

VDD2

VDD1

IN

EQP

EQN

VSS1

4.20 ± 0.20

4.00 ± 0.10

1

0.50

0.60 ± 0.10

0.22 ± 0.05

0.05

0.05 M