SM6801A
Class-D Mono Amplifier for Portable Device
OVERVIEW
The SM6801A is an analog-input, class-D mono 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 16-pin QFN
packages, and requires only a peripheral chip capacitor to form a miniature amplifier circuit.
FEATURES
I
PINOUT
(Top view)
OUTP
VSS2
OUTN
VDD3
VDD4
PDWN
VDD2
MUTEN
DRCN
VDD1
VREF1
IN
TESTN
VSS1
EQN
EQP
I
I
I
I
I
I
Operating supply voltage
• V
DDS
= 2.0 to 3.6V (input, logic)
• V
DDP
= 2.0 to 5.5V (output)
Low current consumption: 4.2mA (V
DD
= 3.6V)
1.6mA (V
DD
= 2.4V)
Output power: 0.7W (V
DD
= 3.6V, 8
Ω
load)
0.28W (V
DD
= 2.4V, 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: 16-pin QFN
PACKAGE DIMENSIONS
APPLICATIONS
I
I
I
(Unit: mm)
Cellular phone
PDA
Digital still camera
A
TOP VIEW
3.0 ± 0.08
B
BOTTOM VIEW
1.8
3 = 1.5 ± 0.05
3.0 ± 0.08
0.3 ± 0.1
ORDERING INFORMATION
Device
SM6801AB
Package
0.5
1.8
C 0.3
0.22 ± 0.05
0.02 S A B
0.1 ± 0.05
φ
0.05 M
S A B
16-pin QFN
S
0.2 S
0.2 ± 0.05
0.05 S
0.5
0.7 ± 0.05
SEIKO NPC CORPORATION —1
NPC [ NIPPON PRECISION CIRCUITS INC ]
