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OP249AZ Datasheet(PDF) 11 Page - Analog Devices |
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OP249AZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 17 page OP249 –11– REV. C The OP249 was carefully designed to provide symmetrically matched slew characteristics in both the negative and positive directions, even when driving a large output load. An amplifier’s slewing limitation determines the maximum frequency at which a sinusoidal output can be obtained without significant distortion. It is, however, important to note that the nonsymmetric stewing typical of previously available JFET amplifiers adds a higher series of harmonic energy content to the resulting response—and an additional dc output compo- nent. Examples of potential problems of nonsymmetric slewing behavior could be in audio amplifier applications, where a natural low distortion sound quality is desired, and in servo or signal processing systems where a net dc offset cannot be tolerated. The linear and symmetric stewing feature of the OP249 makes it an ideal choice for applications that will exceed the full-power bandwidth range of the amplifier. Figure 42. Small-Signal Transient Response, AV = +1, ZL = 2 kΩ 100 pF, No Compensation, VS = ±15 V As with most JFET-input amplifiers, the output of the OP249 may undergo phase inversion if either input exceeds the speci- fied input voltage range. Phase inversion will not damage the amplifier, nor will it cause an internal latch-up condition. Supply decoupling should be used to overcome inductance and resistance associated with supply lines to the amplifier. A 0.1 µF and a 10 µF capacitor should be placed between each supply pin and ground. OPEN-LOOP GAIN LINEARITY The OP249 has both an extremely high open-loop gain of 1 kV/mV minimum and constant gain linearity. This feature of the OP249 enhances its dc precision, and provides superb accu- racy in high closed-loop gain applications. Figure 43 illustrates the typical open-loop gain linearity—high gain accuracy is as- sured, even when driving a 600 Ω load. OFFSET VOLTAGE ADJUSTMENT The inherent low offset voltage of the OP249 will make offset adjustments unnecessary in most applications. However, where a lower offset error is required, balancing can be performed with simple external circuitry, as illustrated in Figures 44 and 45. VERTICAL 50 V/DIV INPUT VARIATION HORIZONTAL 5V/DIV OUTPUT CHARGE Figure 43. Open-Loop Gain Linearity. Variation in Open- Loop Gain Results in Errors in High Closed-Loop Gain Circuits. RL = 600 Ω, VS = ±15 V 1/2 OP249 –V +V VIN R3 R1 200k R5 50k R2 31 VOUT R4 VOS ADJUST RANGE = V R2 R1 Figure 44. Offset Adjust for Inverting Amplifier Configuration 1/2 OP249 –V +V VIN R1 200k R3 50k R2 33 VOUT R5 VOS ADJUST RANGE = V R2 R1 R4 1 + R5 R4 IF R2 << R4 VOUT VIN GAIN = = 1 + R5 R4 + R2 Figure 45. Offset Adjust for Noninverting Amplifier Configuration In Figure 44, the offset adjustment is made by supplying a small voltage at the noninverting input of the amplifier. Resistors R1 and R2 attenuates the pot voltage, providing a ±2.5 mV (with VS = ±15 V) adjustment range, referred to the input. Figure 45 illustrates offset adjust for the noninverting amplifier configura- tion, also providing a ±2.5 mV adjustment range. As indicated in the equations in Figure 45, if R4 is not much greater than R2, there will be a resulting closed-loop gain error that must be accounted for. |
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