The NJM2123 is a operational amplifier with analog switch ( 2
circuit of 2-input/1-output ). It is applicable to the audio part for
Video ( VTR,LD…) and the Car-stereo.
The NJM2123 has the same electrical characteristic of the
NJM2112,and is low saturation output type.
The mode of switch is improved from the current control type
( NJM2120:1 circuit of 2-input/1-output ) to the voltage control
type.So,it is easy to use.
■
FEATURES
●
Single Supply
●
Operating Voltage
●
Slew Rate
●
Analog Switch Function
●
Wide Unity Gain Bandwidth
●
Package Outline
●
Bipolar Technology
■
PIN CONFIGURATION
PIN FUNCTION
1.V
+
■
PACKAGE OUTLINE
NJM2123D
NJM2123M
( +4V~+20V )
( 3V/µs typ. )
( 10MHz typ. )
DIP16,DMP16,SSOP16
NJM2123V
9.GND
10.SW R
11.IN2 B +INPUT
12.IN2 B -INPUT
13.OUT2
14.IN2 A -INPUT
15.IN2 A +INPUT
16.SW2
2.SW1
3.IN1 A +INPUT
4.IN1 A –INPUT
5.OUT1
6.IN1 B –INPUT
7.IN1 B +INPUT
8.SW C
NJM2123D
NJM2123M
NJM2123V
■
EQUIVALENT CIRCUIT
Ver.2003-03-17
-1-
NJM2123
■
ABSOLUTE MAXIMUM RATINGS
( Ta=25˚C )
PARAMETER
Supply Voltage
Differential Input Voltage
Input Voltage
Control Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
+
V
V
ID
V
IC
V
CTR
P
D
T
opr
T
stg
RATINGS
20 (± 10)
± 14
+
20(±10)note:Less than V (note)
+
20(±10)note:Less than V
( DIP8 ) 700
( DMP8 ) 300
( SSOP8 ) 300
-30~+85
-40~+125
UNIT
V
V
V
V
mW
˚C
˚C
■
ELECTRICAL CHARACTERISTICS
( V
+
=5V
,
Ta=25˚C )
PARAMETER
Operating Current
Input Offset Voltage
Input Offset Current
Input Bias Current
Large Signal Voltage Gain
Maximum Output Voltage Swing 1
Maximum Output Voltage Swing 2
Input Common Mode Voltage Range
Common Mode Rejection Ratio
Supply Voltage Rejection Ratio
Slew Rate
Gain Bandwidth Product
Crosstalk
Channel Separation
Switch Threshold Voltage
SYMBOL
I
CC
V
IO
I
IO
I
B
A
V
V
OM1
V
OM2
V
ICM
CMR
SVR
SR
GB
CT
CS
V
th
TEST CONDITION
V
IN
=2.5V,R
L
=∞
R
S
≤
10kΩ
R
L
≥10KΩ
+ -
V /V =±2.5V,R
L
≥2kΩ
+ -
V /V =±2.5V,R
L
≥10kΩ
MIN.
-
-
-
-
60
± 2.0
± 2.3
1.5
60
60
-
-
-
-
2.0
TYP.
6.0
1.0
10
100
80
± 2.2
± 2.4
-
74
80
3
10
90
120
2.5
MAX.
8.0
6.0
200
300
-
-
-
4.0
-
-
-
-
-
-
3.0
UNIT
mA
mV
nA
nA
dB
V
V
V
dB
dB
V/µs
MHz
dB
dB
V
A
V
=1,V
IN
=2V~3V
f=1kHz
f=1kHz
Internal
V
th
( note1 ) Applied circuit voltage gain is desired to be operated within the range of 3dB to 30 dB.
( note2 ) Special care being required for input common mode voltage range and the oscillation due to the capacitive load when operating on voltage follower.
( note3 ) “Crosstalk” is defined about leak of signal on the same circuit.
( note4 ) “Channel Separation” is defined about leak of signal between 2 circuits.
( note5 ) Vth is possible to adjust by external parts.
( note6 ) Voltage for V
-
-PIN has to be supplied earlier than V
+
-PIN in case of two supply voltage.
-2-
Ver.2003-03-17
NJM2123
■
TYPICAL CHARACTERISTICS
In case of single supply voltage ( V =5V )
+
■
SWITCHING MECHANISM
The switch circuit of NJM2123 consist of comparators for switch and circuit for switch threshold voltage ( Vth ) due to establish
threshold of comparator.Vth=Ii x Ri=2.5V in case of above Figure.
Comparator selects INPUT ( A or B ) by compare of control voltage ( V
CTR
) and threshold voltage ( Vth ) and control of
operating current of Amp ( INPUT ).
INPUT A is selected in case of V
CTR
>Vth and INPUT B is selected in case of V
CTR
<Vth.
V
CTR
can not be used between Vth±0.1V in order that signal of both INPUT A and INPUT B are mixed in case that V
CTR
is
near Vth
.
Ver.2003-03-17
-3-
NJM2123
■
ABOUT ADJUSTMENT OF VTH
The switch threshold voltage ( Vth ) is possible to adjust by external parts to SW C/SW R.It needs to be satisfy with
condition of Vth≤V
+
-2V.
This reason is cased by equivalent circuit of comparator for switch.
The Vth has to be adjust in case that supply voltage is less than 5V (
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