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ICL7650BCSA Datasheet(PDF) 9 Page - Maxim Integrated Products |
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ICL7650BCSA Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page The 14-pin DIP configuration has been specifically designed to ease input guarding. The pins adjacent to the inputs are not used. Pin Compatibility The ICL7653’s pinout generally corresponds to that of industry-standard 8-pin devices such as the LM741 or LM101. However, its external null storage capacitors are connected to pins 1 and 8; whereas most op amps leave these pins open or use them for offset null or compensation capacitors. The OP05 and OP07 op amps can be converted for ICL7650/ICL7653 operation. This can be accomplished by removing the offset null potentiometer, which is con- nected from pins 1 and 8 to V+, and replacing it with two capacitors connected from pins 1 and 8 to V-. For LM108 devices, the compensation capacitor is replaced by the external nulling capacitors. Pin 5 is the output clamp connection on the ICL7650/ICL7653. By removing any circuit connections from this pin, the LM101/LM748/LM709 devices can undergo a similar conversion. Typical Applications Figure 4 shows the ICL7650/ICL7653 automatically nulling the offset voltage of a high-speed amplifier. The ICL7650/ICL7653 continuously monitor the voltage at the amplifier’s inverting input, integrate the error, and drive the amplifier’s noninverting input to correct for the offset voltage detected at the inverting input. The cir- cuit’s DC offset characteristics are determined by the ICL7650/ICL7653, and its AC performance is deter- mined by the high-speed amplifier. While this circuit continuously and automatically adjusts the amplifier’s offset to less than 5µV, it does not correct for errors caused by the input bias current, so the value of resis- tor RF should be as low as is practical. This technique can be used with any op amp that is configured as an inverting amplifier. Figures 5 and 6 illustrate basic inverting and noninvert- ing amplifier circuits. Both figures show an output clamping circuit being used to enhance overload recovery performance. Supply voltage (±8V max) and output drive capability (10k Ω load for full swing) are the only limitations to consider when replacing other op amps with the ICL7650/ICL7653. Use a simple booster circuit to overcome these limitations (Figure 7). This enables the full output capabilities of the LM118 (or any other standard device) to be combined with the input capabilities of the ICL7650/ICL7653. Observe the loop gain stability carefully when the feedback network is added, particularly when a slower amplifier such as the LM741 is used. A lower voltage supply is required when mixing the ICL7650/ICL7653 with circuits that operate at ±15V sup- plies. One approach is to use a highly efficient voltage divider. This is illustrated in Figure 8, where the ICL7660 voltage converter is used to convert +15V to +7.5V. Chopper-Stabilized Op Amps _______________________________________________________________________________________ 9 HIGH- SPEED AMP 0.1 µF 47 Ω 10k 100k RF ICL7650 ICL7653 VOUT RIN ICL7650 OUTPUT (R1 || R2) ≥ 100kΩ FOR FULL CLAMP EFFECT INPUT C R C CLAMP 0.1 µF 0.1µF R2 R1 1k NOTE: R1 || R2 INDICATES THE PARALLEL COMBINATION OF R1 || R2. Figure 4. Nulling a High-Speed Amplifier Figure 5. Inverting Amplifier with Optional Clamp |
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