NJM2121 データシートの表示（PDF） - Japan Radio Corporation

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NJM2121

HIGH SPEED OPERATIONAL AMPLIFIER WITH SWITCH

Japan Radio Corporation  

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

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