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OPA607 Datasheet(PDF) 18 Page - Texas Instruments |
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OPA607 Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 48 page  8.3 Feature Description 8.3.1 Operating Voltage The OPAx607 operational amplifiers are fully specified and assured for operation from 2.2 V to 5.5 V, applicable from –40°C to +125°C. The OPAx607 devices are completely operational with asymmetric, symmetric and single supply voltages applied across the supply pins. The total voltage (that is, (VS+) – (VS–)) must be less than the supply voltage mentioned in Section 7.1. 8.3.2 Rail-to-Rail Output and Driving Capacitive Loads Designed as a low-power, low-voltage operational amplifier, the OPAx607 devices are capable of delivering a robust output drive. For resistive loads of 10 kΩ, the output swings to within a few millivolts of either supply rail, regardless of the applied power-supply voltage. Different load conditions change the ability of the amplifier to swing close to the rails. The OPAx607 devices drive up to a nominal capacitive load of 47 pF on the output with no special consideration and without the need of a series isolation resistor RISO while still being able to achieve 45° of phase margin. When driving capacitive loads greater than 47 pF, TI recommends using RISO as shown in Figure 8-1 in series with the output as close to the device as possible. Refer to Figure 7-18 for looking up different values of RISO required for CL to achieve 45° phase margin. Without RISO, the external capacitance (CL) interacts with the output impedance (ZO) of the amplifier, resulting in stability issues. Inserting RISO isolates CL from ZO and restores the phase margin. Figure 8-1 shows the test circuit. + ± VIN RISO CL 10 k VOUT OPAx607 IOVERLOAD 10mA max Rf Rg Cf Figure 8-1. Input Current Protection and Driving Capacitive Loads Figure 8-2 and Figure 8-3 show the phase margin achieved with varying RISO with different values of CL. RISO (:) 0 50 100 150 200 250 300 350 400 450 500 0 10 20 30 40 50 60 70 80 90 100 D018 10pF 22pF 47pF 0.1nF 1nF 10nF Gain = 10 V/V, Cf = 2.5 pF, RL = 10 kΩ Figure 8-2. Phase Margin vs. Series Isolation Resistor RISO (:) 0 50 100 150 200 250 300 350 400 450 500 0 10 20 30 40 50 60 70 80 90 100 D017 10pF 22pF 47pF 0.1nF 1nF 10nF Gain = 20 V/V, Cf = 2.5 pF, RL = 10 kΩ Figure 8-3. Phase Margin vs. Series Isolation Resistor OPA607, OPA2607 SBOS981J – OCTOBER 2019 – REVISED APRIL 2021 www.ti.com 18 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: OPA607 OPA2607 |
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