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OPA637BM Datasheet(PDF) 8 Page - Texas Instruments |
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OPA637BM Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 23 page  8 ® OPA627, 637 TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, and VS = ±15V, unless otherwise noted. FIGURE 1. Circuits with Noise Gain Less than Five Require the OPA627 for Proper Stability. SETTLING TIME vs ERROR BAND 1500 1000 500 0 0.001 0.01 0.1 1 10 Error Band (%) OPA637 G = –4 OPA627 G = –1 – + C F R I R F 2k Ω +5V –5V OPA627 OPA637 R I 2kΩ 500 Ω R F 2kΩ 2k Ω C F 6pF 4pF SETTLING TIME vs LOAD CAPACITANCE 0 150 200 300 400 500 Load Capacitance (pF) 3 2 1 0 Error Band: ±0.01% OPA637 G = –4 OPA627 G = –1 APPLICATIONS INFORMATION The OPA627 is unity-gain stable. The OPA637 may be used to achieve higher speed and bandwidth in circuits with noise gain greater than five. Noise gain refers to the closed-loop gain of a circuit as if the non-inverting op amp input were being driven. For example, the OPA637 may be used in a non-inverting amplifier with gain greater than five, or an inverting amplifier of gain greater than four. When choosing between the OPA627 or OPA637, it is important to consider the high frequency noise gain of your circuit configuration. Circuits with a feedback capacitor (Figure 1) place the op amp in unity noise-gain at high frequency. These applications must use the OPA627 for proper stability. An exception is the circuit in Figure 2, where a small feedback capacitance is used to compensate for the input capacitance at the op amp’s inverting input. In this case, the closed-loop noise gain remains constant with frequency, so if the closed-loop gain is equal to five or greater, the OPA637 may be used. – + – + – + – + – + – + Buffer Bandwidth Limiting Integrator Filter R I R F < 4R Inverting Amp G < |–4| R I R F < 4RI Non-Inverting Amp G < 5 OPA627 OPA627 OPA627 OPA627 OPA627 OPA627 |
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Similar Description - OPA637BM |
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