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PDF NJU8755 Data sheet ( Hoja de datos )
| Número de pieza | NJU8755 | |
| Descripción | Analog Signal Input Stereo Class D Power Amplifier | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJU8755 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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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
#
#
#
#
#
#
#
#
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
VDD
INL
TEST
MUTE
VDDL
OUTLP
VSSL
OUTLN
VDDL
! BLOCK DIAGRAM
VDD
VDDL
VSS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
INL
COM
INR
-
+
Pulse
Width
- Modulator
+
+
- Pulse
Width
+ Modulator
-
Short
Protector
VSS
INR
COM
STBY
VDDR
OUTRP
VSSR
OUTRN
VDDR
VDDR
VDDL
OUTLP
VSSL
VDDL
OUTLN
VSSL
VDDR
OUTRP
VSSR
VDDR
OUTRN
VSSR
Soft Start
Control Logic
Low Voltage
Detector
MUTE STBY TEST
Ver.2003-03-12
-1-
1 page  
NJU385755
! ELECTRICAL CHARACTERISTICS
PARAMETER
VDD,VDDP,VDDN Supply Voltage
Input Impedance
Voltage Gain
Output Power Efficiency
Output THD
Output Power
S/N
Dynamic Range
Channel Separation
Output Level Difference
Between L- and R- channels
Maximum Mute Attenuation
Operating Current (Standby)
Operating Current
(No signal input)
Input Voltage
Input Leakage Current
(Ta=25°C, VDD= VDDL= VDDR=5.0V, VSS=VSSL=VSSR=0V, Input Signal=1kHz,
Input Signal Level=200mVrms, Frequency Band=20Hz~20kHz,
Load Impedance=8Ω, 2nd-order 34kHz LC Filter(Q=0.85))
SYMBOL CONDITIONS
MIN
TYP
MAX
UNIT Note
VDD
ZIN
AV
Eeff
THD
Po
SN
Drange
Echn
INL, INR pins
Output THD=10%
Po=0.6W
Output THD=10%
A weight
A weight
EIAJ(1kHz)
2.7
-
-
80
-
-
-
-
60
5.0 5.25
V
20 - kΩ
23 - dB
- -%
0.05 0.08 % 5
1.2 - W/ch
80 - dB 5
83 - dB 5
- - dB
CHD
- - 3 dB
MAT
90 -
- dB
IST
IDD
No Filter
No Load
- - 1 µA
- 7.5 10 mA
VIH MUTE, STBY pins 0.7VDD
-
VDD
V
VIL MUTE, STBY pins
0
- 0.3VDD V
ILK MUTE, STBY pins
-
- ±1.0 µA
Note 5) Test system of the output THD, S/N and Dynamic Range
The output THD, S/N and dynamic range are tested in the system shown in Figure1, where a 2nd-order
LC LPF and another filter incorporated in an audio analyzer are used.
Input Signal
NJU8755
2nd-order
LC LPF
Filter
20kHz
(AES17)
THD
Measuring
Apparatus
NJU8755 Test Board
Audio Analyzer
Figure 1. Output THD, S/N and Dynamic Range Test System
2nd-order LPF
Filters
: fc=34kHz / Refer to “Typical Application Circuit”.
: 22Hz HPF + 20kHz LPF(AES17)
(with the A-Weight filter for S/N and Dynamic-range tests)
Ver.2003-03-12
-5-
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet NJU8755.PDF ] | |
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