NJU8755 Datasheet, PDF (1/6 Pages) New Japan Radio – Analog Signal Input Stereo Class D Power Amplifier

NJU8755
PRELIMINARY
Analog Signal Input Stereo Class D Power Amplifier
! GENERAL DESCRIPTION
The NJU8755 is an analog signal input stereo class D
power amplifier. The NJU8755 includes Inversion
operational amplifier input circuit, PWM modulators, an
output-short protector and a low voltage detector. The
NJU8755 incorporates BTL amplifiers, which eliminate
AC coupling capacitors, capable of driving up to
1.2W/channel with simple external LC low-pass filters.
Class-D operation achieves high power-efficiency,
which achieves longer battery life for battery powered
applications, thus the NJU8755 is suited for portable
audio, note-PC, etc.
! PACKAGE OUTLINE
NJU8755V
! FEATURES
! PIN CONFIGURATION
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2-Channel Analog Signal Input
2-Channel BTL Outputs :1.2W/channel
Standby(Hi-Z), Mute Control
Built-in Short Protector
Built-in Low Voltage Detector
Operating Voltage
2.7 ~ 5.25V
CMOS Technology
Package Outline
SSOP20
at
5V
into
8Ohms
V_DD
IN_L
TEST
MUTE
V_DDL
OUT_LP
V_SSL
OUT_LN
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
V_DDL
9
12
! BLOCK DIAGRAM
V_DDL
10
11
V_DD
V_SS
IN_L
COM
IN_R
-
+
Pulse
Width
-
Modulator
+
+
-
Pulse
Width
+
Modulator
-
Short
Protector
V_SS
IN_R
COM
STBY
V_DDR
OUT_RP
V_SSR
OUT_RN
V_DDR
V_DDR
V_DDL
OUT_LP
V_SSL
V_DDL
OUT_LN
V_SSL
V_DDR
OUT_RP
V_SSR
V_DDR
OUT_RN
V_SSR
Soft Start
Control Logic
Low Voltage
Detector
MUTE STBY TEST
Ver.2003-03-12
-1-