NJM2761
Audio Limiter
s
GENERAL DESCRIPTION
The
NJM2761
is the audio limiter for speaker protection.
The limit level is adjustable by external resistor.
It is suitable for PC, potable audio and others.
s
PACKAGE OUTLINE
NJM2761RB2
s
FEATURES
q
Wide Operating Voltage
q
Variable Limit Level by external resistor
q
Low Output Noise
q
Bipolar Technology
q
Package Outline
+2.7V to +13.0V
0.2 to1V
-90dBV max.
TVSP10
s
PIN CONFIGURATION
1
10
2
9
3
8
4
7
5
6
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
V+
OUTa
INa
INT
VREF
SENCE
SW
INb
OUTb
GND
s
BLOCK DIAGRAM
Vcc
Vref
INa
OUTa
INb
OUTb
SW
INT
SENSE
-1-
NJM2761
s
ABSOLUTE MAXIMUM RATING
(Ta=25°C)
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
RATINGS
14
320
-20 to +75
-40 to +125
UNIT
V
mW
°C
°C
P
D
T
opr
T
stg
s
ELECTRICAL CHARACTERISTICS
+
q
POWER SUPPLY
(Ta=25°C, V =5V unless otherwise specified)
PARAMETER
Operating Voltage
Operating Current
Reference Voltage
SYMBOL
V
+
TEST CONDITION
-
No Signal
No Signal
MIN.
2.7
-
2.2
TYP.
5.0
1.5
2.5
MAX.
13.0
2.0
2.7
UNIT
V
mA
V
I
CC
Vref
q
AC CHARACTERISTICS
+
(Ta=25°C, V =5V, V
IN
=1Vrms/f=1kHz, Rsense=20kΩ, BW=400-30kHz unless otherwise specified)
PARAMETER
Limit Level 1
Limit Level 2
Limit Off
Output Noise
Total Harmonic Distortion
Cross Talk
Ripple Rejection
SYMBOL
G
LIM1
G
LIM2
G
OFF
V
NO
THD+N
CT
RR
V
ripple
=100mVrms, f=1kHz
+
TEST CONDITION
MIN.
150
TYP.
200
1.0
1.0
-100
(10)
-
-
-
MAX.
250
1.3
1.1
-90
(31.6)
1
-70
-70
(316)
UNIT
mVrms
Vrms
Vrms
dBV
(µVrms)
%
dB
dBV
(µVrms)
V =13V, Rsense=4kΩ
SW=2V
R
S
=0Ω, A-weighting,
V
IN
=2Vrms
+
0.7
0.9
-
-
-
-
q
CONTROL CHARACTERISTICS
(Ta=25°C, V =5V unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Low Level Input Voltage
High Level Input Voltage
V
IL
V
IH
-
-
-
2.0
-
-
0.5
-
V
V
sCONTROL
TERMINAL EXPLANATION
SW(7pin)
MODE
Limiter ON
Limiter OFF
STATUS
L
H
Limiter is active.
Limiter is not active.
NOTE
-2-
NJM2761
sTERMINAL
DESCRIPTION
No.
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
1
V+
Power Supply Terminal
-
2
9
OUTa
OUTb
Ach Output Terminal
Bch Output Terminal
OUTa
OUTb
100
V+/2
1k
3
8
INa
INb
Ach Input Terminal
Bch Input Terminal
INa
INb
96k
V+/2
48k
4
INT
Smoothing Capacitor Connection
Terminal
INT
400
0.7V
300k
5
VREFIN
Reference Voltage Stabilizing
Capacitor Connection Terminal
VREFIN
300k
V+/2
300k
-3-
Microchip MCU
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