NJRC NJW1200

NJW1200
Low-Voltage 2-channel Electronic Volume with ealaBASS
!GENERAL DESCRIPTION
The NJW1200 is a low-voltage 2-channel Electronic
Volume with ealaBASS. It includes main volume, 2 stereo
inputs selector (Differential Input), 2nd Order HPF. And It
performs NJRC original dynamic bass boost technology
“ealaBASS” provides graceful bass sound with low
distortion.
The NJW1200 performs low noise and low distortion
characteristics with resistance ladder type electrical volume.
The NJW1200 operates on low supply voltage. And It
includes power save function. Therefore, it is suitable for low
voltage supply portable systems.
2
All of internal status and variables are controlled by I C
BUS interface.
!PACKAGE OUTLINE
NJW1200V
!FEATURES
●Operating Voltage
2.7 to 5.5V
●Low Consumption
3mA typ.
●Power Save Function 120µA typ.
●I2C BUS Interface
●ealaBASS (Dynamic Bass Boost)
●eala (Surround Sound for stereo source) & eala MONO (Surround Sound for monaural source)
●Low Output Noise
-100dBV typ.
●Low Distortion
0.07% typ.
●Main Volume
0 to –78dB / 2dB step, Mute
●2 stereo Inputs Selector (Differential Input)
●2nd Order HPF
●Bi-CMOS Technology
●Package Outline
SSOP32
!BLOCK DIAGRAM
SELOUTa
EVROUTa
OUTa
AUX
Control
Differential
Input stage
IN1a
SDA
DIFFGND1
I2CBus
Interface
HPF
SCL
EVR
IN1b
eala/
ealaBass
IN2a
Bias
DIFFGND2
HPF
IN2b
EVR
Input
selector
SELOUTb
EVROUTb
OUTb
–1–
NJW1200
! Application Circuit
C25 4.7µF
C1 4.7µF
IN2a
IN2a
1
R1 51kΩ
IN1a
C2 4.7µF
DIFFGND2
DFFGND2
2
R2 51kΩ
DIFFGND1
IN2b
SELOUTa
4
SELOUTa
C5 0.47µF
C6 150nF
5
EVRINa
6
EVROUTa
7
HPF1a
8
HPF2a
9
HBSTa
10
ealaBass
LPF1
11
ealaBass
INT
NJW1200
3
R8
12kΩ
C7 150nF
R9 39kΩ
C8 1nF
C9 470nF
C10 1µF
OUTa
12
OUTa
IN1b
30
SELOUTb
29
EVRINb
28
EVROUTb
27
HPF1b
26
HPF2b
25
HBSTb
24
DIFFGND1
SELOUTb
ealaBass
LPF3
23
ealaBass
LPF2
22
C20 150nF
OUTb
C27 10µF
C18 1nF
C17 82nF
OUTb
21
C15 10nF
19
15
SCL
VREF
18
16
GND
V+
17
SCL
IN1b
R10 39kΩ
SURTC
14
R6 51kΩ
C19 150nF
SDA
SDA
C23 4.7µF
R11
12kΩ
20
AUX
R7 51kΩ
C21 0.47µF
eala
Filter
13
C24 4.7µF
31
C3 4.7µF
IN2b
C26 10µF
IN1a
32
C14 1µF
C13 1µF
V+
C12 1µF
V pullup
( 1.5V to V +)
Headphone
OUTa
1
330 uF
2
0.22uF 10ohm
0.47uF
3
0.33 uF
4
VCC
5
22uF
Headphone Driver
(NJM2776)
Power save Control
10
330uF
Headphone
OUTb
9
10ohm 0.22uF
8
0.47uF
7
6
22uF
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
–2–