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OPA627 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA627 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page 9 ® OPA627, 637 – + C 2 C 1 R 2 R 1 OPA637 C 1 = CIN + CSTRAY C 2 = R 1 C1 R 2 OFFSET VOLTAGE ADJUSTMENT The OPA627/637 is laser-trimmed for low offset voltage and drift, so many circuits will not require external adjust- ment. Figure 3 shows the optional connection of an external potentiometer to adjust offset voltage. This adjustment should not be used to compensate for offsets created elsewhere in a system (such as in later amplification stages or in an A/D converter) because this could introduce excessive tempera- ture drift. Generally, the offset drift will change by approxi- mately 4 µV/°C for 1mV of change in the offset voltage due to an offset adjustment (as shown on Figure 3). FIGURE 2. Circuits with Noise Gain Equal to or Greater than Five May Use the OPA637. amp contributes little additional noise. Below 1k Ω, op amp noise dominates over the resistor noise, but compares favorably with precision bipolar op amps. CIRCUIT LAYOUT As with any high speed, wide bandwidth circuit, careful layout will ensure best performance. Make short, direct interconnections and avoid stray wiring capacitance—espe- cially at the input pins and feedback circuitry. The case (TO-99 metal package only) is internally connected to the negative power supply as it is with most common op amps. Pin 8 of the plastic DIP, SOIC, and TO-99 packages has no internal connection. Power supply connections should be bypassed with good high frequency capacitors positioned close to the op amp pins. In most cases 0.1 µF ceramic capacitors are adequate. The OPA627/637 is capable of high output current (in excess of 45mA). Applications with low impedance loads or capacitive loads with fast transient signals demand large currents from the power supplies. Larger bypass capacitors such as 1 µF solid tantalum capacitors may improve dynamic performance in these applications. NOISE PERFORMANCE Some bipolar op amps may provide lower voltage noise performance, but both voltage noise and bias current noise contribute to the total noise of a system. The OPA627/637 is unique in providing very low voltage noise and very low current noise. This provides optimum noise performance over a wide range of sources, including reactive source impedances. This can be seen in the performance curve showing the noise of a source resistor combined with the noise of an OPA627. Above a 2k Ω source resistance, the op FIGURE 4. Connection of Input Guard for Lowest IB. Board Layout for Input Guarding: Guard top and bottom of board. Alternate—use Teflon® standoff for sen- sitive input pins. Teflon® E.I. du Pont de Nemours & Co. – + 2 3 In Non-inverting 6 OPA627 Out – + 2 3 In Inverting 6 OPA627 Out – + 2 3 In Buffer 6 OPA627 Out 3 2 4 5 6 7 8 No Internal Connection 1 TO-99 Bottom View To Guard Drive – + 2 3 7 1 5 6 +V S –V S OPA627/637 100k Ω 10k Ω to 1MΩ Potentiometer (100k Ω preferred) ±10mV Typical Trim Range 4 FIGURE 3. Optional Offset Voltage Trim Circuit. |
Similar Part No. - OPA627_07 |
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Similar Description - OPA627_07 |
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