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NJU8725 Datasheet

  • NJU8725

  • CLASS D AMPLIFIER FOR DIGITAL AUDIO

  • 13頁

  • ETC

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NJU8725
PRELIMINARY
CLASS D AMPLIFIER FOR DIGITAL AUDIO
!
GENERAL DESCRIPTION
The
NJU8725
is an 800mW-output class D
th
Amplifier featuring 6
鈭單?/div>
modulation. It includes
Digital Attenuator, Mute, and De-emphasis circuits. It
converts Digital source input to PWM signal output
which is output PWM signal converted to analog
signal with simple external LC Filter. The
NJU8725
realizes very high power-efficiency by class D
operation. Therefore, it is suitable for battery-powered
applications and others.
!
PACKAGE OUTLINE
NJU8725V
!
FEATURES
#
#
#
#
#
#
#
#
#
#
#
#
#
!
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
F0/DATA
F1/REQ
F2/SCK
DIN
V
DDR
OUT
RP
V
SSR
OUT
RN
V
DDR
LRCK
BCK
MCK
Stereo BTL Power Amplifier
Sixth-order 32f
S
Over Sampling
鈭單?/div>
& PWM
V
DD
Internal 8f
S
Over Sampling Digital Filter
STBY
Sampling Frequency : 96kHz (Max.)
TEST
De-Emphasis
: 32kHz, 44.1kHz, 48kHz
MUTE
System Clock
: 256f
S
V
DDL
Digital Processing
: Attenuator 107step, LOG Curve
: Mute
OUT
LP
Digital Audio Interface : 16bit, 18bit
V
SSL
2
: I S, LSB Justified, MSB Justified
OUT
LN
Short Circuit Protection
V
DDL
Operating Voltage
: 3.0 to 3.6V
Driving Voltage
: V
DD
to 5.25V
MODE
C-MOS Technology
RST
Package Outline
: SSOP24
V
SS
!
BLOCK DIAGRAM
V
DD
V
SS
RST
MCK
LRCK
BCK
DIN
MUTE
STBY
MODE
F0/DATA
F1/REQ
F2/SCK
Serial
Audio Data
Interface
8f
S
Over Sampling
Digital Filter
32f
S
6
鈭單?/div>
&
PWM
th
Power On
Reset Circuit
Synchronization
Circuit
Short Circuit
Protection
V
DDL
OUT
LP
V
SSL
V
DDL
OUT
LN
V
SSL
V
DDR
OUT
RP
System
Control
V
SSR
V
DDR
OUT
RN
V
SSR
-1-

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