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| 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 PIN CONFIGURATION PIN FUNCTION 1.SW.CONTROL 2.A +INPUT 3.A -INPUT 4.V 5.OUTPUT 6.B -INPUT 7.B +INPUT + 8.V PACKAGE OUTLINE NJM2121D NJM2121M ( 3V~18V ) ( 4V/s typ. ) ( 14MHz typ. ) DIP8,DMP8,SIP8 NJM2121L NJM2121D NJM2121M NJM2121L EQUIVALENT CIRCUIT Ver.2003-03-18 -1- NJM2121 ABSOLUTE MAXIMUM RATINGS ( Ta=25C ) PARAMETER Supply Voltage Differential Input Voltage Input Voltage Output Current Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL +V /V VID VIC IO PD Topr Tstg RATINGS 18 ( 36 ) 30 15 50 ( DIP8 ) 500 ( DMP8 ) 300 ( SIP8 ) 800 -20~+75 -40~+125 UNIT V V V mA mW C C ELECTRICAL CHARACTERISTICS ( V+/V-=15V,Ta=25C ) 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 VIN TEST CONDITION SW ON SW OFF RS=10k 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 A dB V % V/V dB MHz V/s Vrms RL=2k RL10k f=1kHz,VO=5Vrms,GV=20dB f=1kHz GV=0dB GV=0dB,RL=2k//100pF RS=1k,BW=10Hz~30kHz,Flat -2- Ver.2003-03-18 NJM2121 TEST CIRCUIT Ver.2003-03-18 -3- NJM2121 TYPICAL CHARACTERISTICS -4- Ver.2003-03-18 NJM2121 APPLICATION CIRCUIT ( 1 ) GV=10dB FLAT Amp+Analog Switch Circuit ( 2 ) Analog Switch Circuit ( GV=0dB Voltage Follower Amp ) Ver.2003-03-18 -5- NJM2121 SWITCHING MECHANISM 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.2003-03-18 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.2003-03-18 -7- |
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