NJU7181
SIGNAL LEVEL SENSOR SYSTEM
GENERAL DESCRIPTION
The
NJU7181
is a signal level sensor system IC. It sends
a High flag to the microprocessor or other equipments
whenever it detects the existence of the audio signal.
The
NJU7181
includes a delay circuit which allows the
IC continue to hold the flag after the absence of the audio
signal. This holding time can be adjusted with external
capacitor.
Together with its adjustable Input Sensitivity
(by external
resistor)
& its characteristic of low current consumption and
low operating voltage,
NJU7181
is suitable for Eco-Design of
Energy-using Products and for battery operated applications.
PACKAGE OUTLINE
NJU7181RB1
MSOP8 (TVSP8)
NJU7181KU1
FEATURES
•
Operating Voltage
0.9 to 5.5V
•
Low Operating Current
55µA typ.
•
Delay circuit for long Recovery time
•
Adjustable Recovery time by external capacitor
•
Adjustable Input Sensitivity by external resistance
•
C-MOS Technology
•
Package Outline
MSOP8 (TVSP8)*
ESON8
*MEET JEDEC MO-187-DA / THIN TYPE
APPLICATIONS
•
Power Saving for battery operated devices
•
Muting Application
•
Memory saving for recording devices
•
Half- duplex transmission application
BLOCK DIAGRAM
V
+
ON
OFF
V
+
External Trigger
OUT
D
Level
Detector
Delay
L
CLR
Latch
IN
Version 5.4E
–1–
NJU7181
ABSOLUTE MAXIMUM RATING
(Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
Power Dissipation
Maximum Input Voltage
Operating Temperature Range
Storage Temperature Range
V
+
RATING
+7
MSOP8 (TVSP8): 470 (Note1)
ESON8: 450
+
0 ~ V (Note2)
-40 ~ +85
-40 ~ +125
UNIT
V
mW
V
°C
°C
P
D
V
IMAX
Topr
Tstg
(Note1) EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting
(Note2) Don’t put Input Voltage more than Power Supply Voltage.
ELECTRICAL CHARACTERISTICS
(Ta=25°C, V =3V, R
1
=10kΩ, R
2
=100kΩ, R
d
=220kΩ, C
d
=10nF)
+
PARAMETER
Operating Voltage
Operating Current
Input Sensitivity
Delay Time 1
Delay Time 2
Delay Time 3
SYMBOL
V
+
TEST CONDITION
No signal, R
L
=∞
f=1kHz
MIN.
0.9
-
-45
1.0
TYP.
-
55
-41.5
1.5
1.5
1,500
MAX.
5.5
100
-38
2.0
2.0
-
UNIT
V
µA
dBV
Sec
Sec
Sec
I
DD
V
INS
T
delay1
T
delay2
T
delay3
V =0.9V
C
d
=10µF
+
1.0
-
DC CHARACTERISTICS
DC Output Terminal (7pin)
(Ta=25°C)
PARAMETER
High Level Output Voltage
Low Level Output Voltage
(Ta=25°C)
SYMBOL
V
OH
V
OL
TEST CONDITION
I
SOURCE
=1mA
I
SINK
=1mA
MIN.
V -0.2
0
+
TYP.
-
-
MAX.
V
+
UNIT
V
V
0.2
External Trigger Switch Terminal (3pin)
High Level Input Voltage
Low Level Input Voltage
V
IH
V
IL
V -0.2
0
+
-
-
V
+
V
V
0.2
–3–
NJU7181
APPLICATION CIRCUIT
Audio Signal Input
Main Path
V
+
ON
Audio Signal Output
100kΩ
OFF
V
+
External Trigger
DC Output
D
Level
Detector
Delay
L
CLR
Latch
High or Low
DC voltage inform ation
(to Micro Processor, etc)
C
D
Ci
R
1
R
2
R
D
=220kΩ
Input sensitivity
(Detection level)
Audio Signal Input
Delay Time
(Adjustable from a few second to a few minutes by C
D
)
DC Output (NJU7181)
Low
High
Low
–5–
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