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OPA445AP Datasheet(PDF) 8 Page - Texas Instruments |
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OPA445AP Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 25 page  OPA445 SBOS156B − MARCH 1987 − REVISED APRIL 2008 www.ti.com 8 APPLICATIONS Figure 1 shows the OPA445 connected as a basic noninverting amplifier. The OPA445 can be used in virtually any op amp configuration. Power-supply terminals should be bypassed with 0.1 µF capacitors, or greater, near the power supply pins. Be sure that the capacitors are appropriately rated for the power-supply voltage used. G= 1+ R 2 R 1 Z L R 2 R 1 OPA445 V − V+ V IN 0.1 µF 0.1 µF V O Figure 1. The OPA445 Configured as a Noninverting Amplifier POWER SUPPLIES The OPA445 may be operated from power supplies up to ±45V or a total of 90V with excellent performance. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with operating voltage are shown in the Typical Characteristics. Some applications do not require equal positive and negative output voltage swing. Power-supply voltages do not need to be equal. The OPA445 can operate with as little as 20V between the supplies and with up to 90V between the supplies. For example, the positive supply could be set to 80V with the negative supply at −10V, or vice-versa. INPUT PROTECTION The inputs of conventional FET-input op amps should be protected against destructive currents that can flow when input FET gate-to-substrate isolation diodes are forward-biased. This can occur if the input voltage exceeds the power supplies or there is an input voltage with VS = 0V. Protection is easily accomplished with a resistor in series with the input. Care should be taken because the resistance in series with the input capacitance may affect stability. Many input signals are inherently current-limited; therefore, a limiting resistor may not be required. OFFSET VOLTAGE TRIM The OPA445 provides offset voltage trim connections on pins 1 and 5. Offset voltage can be adjusted by connecting a potentiometer as shown in Figure 2. This adjustment should be used only to null the offset of the op amp, not to adjust system offset or offset produced by the signal source. Nulling system offset could degrade the offset voltage drift behavior of the op amp. While it is not possible to predict the exact change in drift, the effect is usually small. OPA445 3 2 6 1 4 5 7 V − 10mV Typical Trim Range (1) V+ NOTE: (1) 10k Ωto 1MΩ Trim Potentiometer (100k Ωrecommended). Use offset adjust pins only to null offset voltage of op amp−see text. Figure 2. Offset Voltage Trim |
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