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TC7650CPD 데이터시트(PDF) 5 Page - TelCom Semiconductor, Inc |
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TC7650CPD 데이터시트(HTML) 5 Page - TelCom Semiconductor, Inc |
5 / 7 page 3-277 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 Figure 4. Noninverting Amplifier With Optional Clamp Figure 3. Internal Clamp Circuit INTERNAL POSITIVE CLAMP BIAS V –V V – 0.7V ++ T P-CHANNEL OUTPUT CLAMP PIN N-CHANNEL INTERNAL NEGATIVE CLAMP BIAS V + V – T V + 0.7V – TC7650 OUTPUT PIN ≈≈ ≈ ≈ TC7650 + – C R C OUTPUT INPUT FOR FULL CLAMP EFFECT. R2 R1 + ( / ) R2 R1 ≥ 100k Ω R3 0.1µF CONNECT TO V ON 8-PIN DIP. * SS * R CLAMP 3 eliminates the overload recovery problem by reducing the feedback network gain before the output voltage reaches either supply rail. The output clamp circuit is shown in Figure 3, with typical inverting and noninverting circuit connections shown in Figures 4 and 5. Output voltage versus clamp circuit current characteristics are shown in the typical operating curves. For the clamp to be fully effective, the impedance across the clamp output should be greater than 100k Ω. Latch-Up Avoidance Junction-isolated CMOS circuits inherently include a parasitic 4-layer (p-n-p-n) structure which has characteris- tics similar to an SCR. Under certain circumstances this junction may be triggered into a low-impedance state, result- ing in excessive supply current. To avoid this condition, no voltage greater than 0.3V beyond the supply rails should be applied to any pin. In general, the amplifier supplies must be established either at the same time or before any input signals are applied. If this is not possible, the drive circuits must limit input current flow to under 0.1mA to avoid latch- up. Thermoelectric Potentials Precision DC measurements are ultimately limited by thermoelectric potentials developed in thermocouple junc- tions of dissimilar metals, alloys, silicon, etc. Unless all junctions are at the same temperature, thermoelectric volt- ages, typically around 0.1 µV/°C, but up to tens of µV/°C for some materials, will be generated. In order to realize the benefits extremely-low offset voltages provide, it is essential to take special precautions to avoid temperature gradients. All components should be enclosed to eliminate air move- ment, especially those caused by power-dissipating ele- ments in the system. Low thermoelectric-coefficient con- nections should be used where possible and power supply voltages and power dissipation should be kept to a mini- mum. High-impedance loads are preferable, and separation from surrounding heat-dissipating elements is advised. Pin Compatibility On the 8-pin mini-DIP TC7650, the external null storage capacitors are connected to pins 1 and 8. On most other operational amplifiers these are left open or are used for offset potentiometer or compensation capacitor connec- tions. For OP05 and OP07 operational amplifiers, the replace- ment of the offset null potentiometer between pins 1 and 8 by two capacitors from the pins to VSS will convert the OP05/ 07 pin configurations for TC7650 operation. For LM108 devices, the compensation capacitor is replaced by the external nulling capacitors. The LM101/748/709 pinouts are modified similarly by removing any circuit connections to pin 5. On the TC7650, pin 5 is the output clamp connection. Figure 5. Inverting Amplifier with Optional Clamp TC7650 CLAMP + – C R C R1 OUTPUT 0.1 F µ 0.1 F µ INPUT R2 FOR FULL CLAMP EFFECT. ( ) R2 R1 ≥ 100kΩ * CONNECT TO V ON 8-PIN DIP. * R – CHOPPER-STABILIZED OPERATIONAL AMPLIFIER TC7650 |
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