Designated client product
This product will be discontinued its production in the near term.
And it is provided for customers currently in use only, with a time limit.
It can not be available for your new project. Please select other new or
existing products.
For more information, please contact our sales office in your region.
New Japan Radio Co.,Ltd.
www.njr.com
NJM2121
HIGH SPEED OPERATIONAL AMPLIFIER WITH SWITCH
■ GENERAL DESCRIPTION
The NJM2121 is a dual operational amplifier of 2-INPUT and
1-OUTPUT with analog switch. The NJM2121 can be used as
analog switch under the condition of GV=0dB, as Switch + Amp
in order that each gain (A or B) can be adjusted independently.
Each amplifier of the NJM2121 has the same electrical
characteristics as the NJM4560.
The NJM2121 is suitable for Audio, Video, Electrical musical
instrument…etc.
■ FEATURES
● Analog Switch Function
● Operating Voltage
● Slew Rate
● Wide Unity Gain Bandwidth
● Package Outline
● Bipolar Technology
■ PACKAGE OUTLINE
NJM2121D
NJM2121M
( ±3V~±18V )
( 4V/µs typ. )
( 14MHz typ. )
DIP8,DMP8
■ PIN CONFIGURATION
Top View
PIN FUNCTION
1.SW.CONTROL
2.A +INPUT
3.A -INPUT
4.V5.OUTPUT
6.B –INPUT
7.B +INPUT
+
8.V
■ EQUIVALENT CIRCUIT
Ver.2011-03-16
-1-
NJM2121
■ ABSOLUTE MAXIMUM RATINGS
( Ta=25˚C )
PARAMETER
Supply Voltage
Differential Input Voltage
Input Voltage
Output Current
SYMBOL
V+/VVID
VIC
IO
Power Dissipation
PD
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
RATINGS
± 18 ( 36 )
± 30
± 15
± 50
( DIP8 ) 500
( DMP8 ) 300
-20~+75
-40~+125
UNIT
V
V
V
mA
mW
˚C
˚C
■ ELECTRICAL CHARACTERISTICS
( V+/V-=±15V,Ta=25˚C )
PARAMETER
Operating Current
Input Offset Voltage
Input Bias Current
Large Signal Voltage Gain
Maximum Output Voltage Swing
Total Harmonic Distortion
Supply Voltage Rejection Ratio
Channel Separation
Unity Gain Bandwidth
Slew Rate
Equivalent Input Noise Voltage
SYMBOL
ICC
VIO
IB
AV
VOM
THD
SVR
CS
fT
SR
VNI
TEST CONDITION
SW ON
SW OFF
RS=10kΩ
VIN
RL=2kΩ
RL≥10kΩ
f=1kHz,VO=5Vrms,GV=20dB
f=1kHz
GV=0dB
GV=0dB,RL=2kΩ//100pF
RS=1kΩ,BW=10Hz~30kHz,Flat
MIN.
± 12
-
TYP.
2.3
2.1
0.8
0.2
110
± 14
0.002
20
82
14
4
2.0
MAX.
6.0
6.0
6.0
1.0
150
-
UNIT
mA
mA
mV
µA
dB
V
%
µV/V
dB
MHz
V/µs
µVrms
■ TEST CIRCUIT
-2-
Ver.2011-03-16
NJM2121
■ TYPICAL CHARACTERISTICS
Ver.2011-03-16
-3-
NJM2121
■ APPLICATION CIRCUIT
-4-
Ver.2011-03-16
NJM2121
( 1 ) GV=10dB FLAT Amp+Analog Switch Circuit
( 2 ) Analog Switch Circuit ( GV=0dB Voltage Follower Amp )
■ SWITCHING MECHANISM
Ver.2011-03-16
-5-
NJM2121
Switching Mechanism of NJM2121 is as follows.
Switch signal is communicated in case that VF of Q26 goes ON on current mirror which is composed with Q26 and Q27.Q10
goes ON by 4diodes of Q10 in case that terminal 1 goes OFF and Amp ( ch A ) goes active.Q9 goes ON by 6 diodes of Q9 in
case that terminal 1 goes ON and Amp ( ch B ) goes active.So,NJM2121 have merit that drive system is controlled freely.
Because drive system is not related to supply voltage system ( Single supply type/Two supply type ) in order that switch change
by current ON/OFF.
But, this switch goes ON by very little current because of signal communicate system which depend on ON of VF. So, please
use NJM2121 under the condition of lowering sensitivity for current ON/OFF by external Pull-up-resistance ( Rp )
-6-
Ver.2011-03-16
NJM2121
[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.
Ver.2011-03-16
-7-
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