SM6802A
Class-D Stereo Amplifier for Portable Device
OVERVIEW
The SM6802A is an analog-input, class-D stereo amplifier. Class-D operation provides high efficiency and low
power consumption. The device also incorporates an original 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
I
PINOUT
(Top view)
LEQN
VREF1
TESTN
MUTEN
LOUTN
20 19 18 17 16
I
I
I
I
I
APPLICATIONS
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I
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PACKAGE DIMENSIONS
(Unit: mm)
4.20 ± 0.20
Cellular phone
PDA
Digital still camera
ORDERING INFORMATION
4.20 ± 0.20
4.00 ± 0.10
Device
SM6802AB
Package
20-pin QFN
4.00 ± 0.10
20
1
0.50
REQN
VSS1
PWDN
DRCN
ROUTN
Operating supply voltage: 2.7 to 5.5V
Low current consumption: 6mA
(VDD1 = VDD2 = VDD3 = 3.6V)
Output power: 0.7W + 0.7W
(VDD1 = VDD2 = VDD3 = 3.6V, 8
Ω
load)
Output fundamental frequency: 125kHz
Gain
• 6dB (Normal)
• 15dB to 6dB automatic adjustment in response
to the input level
(Dynamic range compression mode)
Silicon-gate CMOS process
Package: 20-pin QFN
LEQP
LIN
VDD1
RIN
REQP
1
2
3
4
5
6 7 8 9 10
15
14
13
12
11
VDD3
LOUTP
VSS2
ROUTP
VDD2
0.60 ± 0.10
0.05
0.22 ± 0.05
0.05 M
1.00MAX
NIPPON PRECISION CIRCUITS INC.—1
+ 0.03
0.02
−
0.02
0.22