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ICL7650S Fiches technique(PDF) 6 Page - Renesas Technology Corp |
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ICL7650S Fiches technique(HTML) 6 Page - Renesas Technology Corp |
6 / 13 page ICL7650S FN2920 Rev 10.00 Page 6 of 13 April 12, 2007 PIN COMPATIBILITY The basic pinout of the 8-pin device corresponds, where possible, to that of the industry standard 8-pin devices, the LM741, LM101, etc. The null-storing external capacitors are connected to pins 1 and 8, usually used for offset null or compensation capacitors, or simply not connected. In the case of the OP-05 and OP-07 devices, the replacement of the offset-null pot, connected between pins 1 and 8 and V+, by two capacitors from those pins to pin 5, will provide easy compatibility. As for the LM108, replacement of the compensation capacitor between pins 1 and 8 by the two capacitors to pin 5 is all that is necessary. The same operation, with the removal of any connection to pin 5, will suffice for the LM101, A748, and similar parts. The 14-pin device pinout corresponds most closely to that of the LM108 device, owing to the provision of “NC” pins for guarding between the input and all other pins. Since this device does not use any of the extra pins, and has no provision for offset-nulling, but requires a compensation capacitor, some changes will be required in layout to convert it to the ICL7650S. Typical Applications Clearly the applications of the ICL7650S will mirror those of other op amps. Anywhere that the performance of a circuit can be significantly improved by a reduction of input-offset voltage and bias current, the ICL7650S is the logical choice. Basic non-inverting and inverting amplifier circuits are shown in Figures 2 and 3. Both circuits can use the output clamping circuit to enhance the overload recovery performance. The only limitations on the replacement of other op amps by the ICL7650S are the supply voltage ( 8V Max) and the output drive capability (10k load for full swing). Even these limitations can be overcome using a simple booster circuit, as shown in Figure 4, to enable the full output capabilities of the LM741 (or any other standard device) to be combined with the input capabilities of the ICL7650S. The pair form a composite device, so loop gain stability, when the feedback network is added, should be watched carefully. Figure 5 shows the use of the clamp circuit to advantage in a zero-offset comparator. The usual problems in using a chopper stabilized amplifier in this application are avoided, since the clamp circuit forces the inverting input to follow the input signal. The threshold input must tolerate the output clamp current VlN/R without disturbing other portions of the system. The pin configuration of the 14 pin dual in-line package is designed to facilitate guarding, since the pins adjacent to the inputs are not used (this is different from the standard 741 and 101A pin configuration, but corresponds to that of the LM108). FIGURE 1A. INVERTING AMPLIFIER FIGURE 1B. FOLLOWER FIGURE 1C. NON-INVERTING AMPLIFIER FIGURE 1. CONNECTION OF INPUT GUARDS + - INPUT R1 R2 OUTPUT + - INPUT OUTPUT + - INPUT R1 R2 OUTPUT R1 R2 R1 R2 + ---------------------- NOTE: SHOULD BE LOW IMPEDANCE FOR OPTIMUM GUARDING 7650S + - 0.1 F OUTPUT C R C R2 R1 R3 CLAMP INPUT 0.1 F R3 + (R1||R2) 100k For Full Clamp Effect NOTE: R1||R2 indicates the parallel combination of R1 and R2. FIGURE 2. NON INVERTING AMPLIFIER WITH OPTIONAL CLAMP |
Numéro de pièce similaire - ICL7650S |
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Description similaire - ICL7650S |
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