NJM2121
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HIGH SPEED OPERATIONAL AMPLIFIER WITH SWITCH
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
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 ( ±3V~±18V )
● Slew Rate ( 4V/µs typ. )
● Wide Unity Gain Bandwidth ( 14MHz typ. )
● Package Outline DIP8,DMP8
● Bipolar Technology
■ PIN CONFIGURATION
■ EQUIVALENT CIRCUIT
NJM2121D NJM2121M
PIN FUNCTION
1.SW.CONTROL
2.A +INPUT
3.A -INPUT
4.V
-
5.OUTPUT
6.B –INPUT
7.B +INPUT
8.V
+
Top View
NJM2121
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■ ABSOLUTE MAXIMUM RATINGS
( Ta=25˚C )
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V
+
/V
-
± 18 ( 36 ) V
Differential Input Voltage V
ID
± 30 V
Input Voltage V
IC
± 15 V
Output Current I
O
± 50 mA
( DIP8 ) 500
Power Dissipation P
D
( DMP8 ) 300 mW
Operating Temperature Range T
opr
-20~+75 ˚C
Storage Temperature Range T
stg
-40~+125 ˚C
■ ELECTRICAL CHARACTERISTICS
( V+/V-=±15V
,
Ta=2 5˚C )
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Current I
CC
V
IN
SW ON - 2.3 6.0 mA
SW OFF - 2.1 6.0 mA
Input Offset Voltage V
IO
R
S
=10kΩ - 0.8 6.0 mV
Input Bias Current I
B
- 0.2 1.0 µA
Large Signal Voltage Gain A
V
R
L
=2kΩ - 110 - dB
Maximum Output Voltage Swing V
OM
R
L
≥10kΩ ± 12 ± 14 - V
Total Harmonic Distortion THD f=1kHz,V
O
=5Vrms,G
V
=20dB - 0.002 - %
Supply Voltage Rejection Ratio SVR - 20 150 µV/V
Channel Separation CS f=1kHz - 82 - dB
Unity Gain Bandwidth f
T
G
V
=0dB - 14 - MHz
Slew Rate SR G
V
=0dB,R
L
=2kΩ//100pF - 4 - V/µs
Equivalent Input Noise Voltage V
NI
R
S
=1kΩ,BW=10Hz~30kHz,Flat - 2.0 - µVrms
■ TEST CIRCUIT
NJM2121
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■ TYPICAL CHARACTERISTICS
NJM2121
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■ APPLICATION CIRCUIT
NJM2121
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( 1 ) GV=10dB FLAT Amp+Analog Switch Circuit
( 2 ) Analog Switch Circuit ( GV=0dB Voltage Follower Amp )
■ SWITCHING MECHANISM
NJM2121
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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 )
NJM2121
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[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.
