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OPA2137E Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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OPA2137E Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 8 page 7 ® OPA137, 2137, 4137 APPLICATIONS INFORMATION OPA137 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. Power supply pins should be bypassed with 10nF ceramic capaci- tors or larger. All circuitry is completely independent in dual and quad versions, assuring normal performance when one amplifier in a package is overdriven or short circuited. Many key parameters are guaranteed over the specified tempera- ture range, –40 °C to +85°C. OPERATING VOLTAGE OPA137 op amps can be operated on power supplies as low as ±2.25V. Performance remains excellent with power sup- plies ranging from ±2.25V to ±18V (+4.5V to +36V single supply). Most parameters vary only slightly throughout this supply voltage range. Quiescent current and short-circuit current vs supply voltage are shown in Typical Performance Curves. Operation at very low supply voltage (VS ≤ ±3V) requires careful attention to ensure that the common-mode voltage remains within the linear range, VCM = (V–)+3V to (V+). Inputs may need to be biased above ground in accordance with the common-mode voltage range restrictions for linear operation. INPUT VOLTAGE The input common-mode voltage range of OPA137 series op amps extends from (V–)+3V to the positive rail, V+. For normal operation, inputs should be limited to this range. The inputs may go beyond the power supplies without output phase-reversal. Many FET-input op amps (such as TL061 types) exhibit phase-reversal of the output when the input common-mode range is exceeded. This can occur in voltage- follower circuits, causing serious problems in control loop applications. Input terminals are diode-clamped to the power supply rails for ESD protection. If the input voltage can exceed the negative supply by 500mV, input current should be limited to 2mA (or less). If the input current is not adequately limited, you may see unpredicatable behavior in the other amplifiers in the package. This is easily accomplished with an input resistor as shown in Figure 1. Many input signals are inherently current-limited, therefore, a limiting resistor may not be required. FIGURE 1. Input Current Protection for Voltages Exceed- ing the Supply Voltage. HIGH-SIDE CURRENT SENSING Many applications require the sensing of signals near the positive supply. The common-mode input range of OPA137 op amps includes the positive rail, enabling them to be used to sense power supply currents as shown in Figure 2. FIGURE 2. High-Side Current Monitor. INPUT BIAS CURRENT The input bias current is approximately 5pA at room tem- perature and increases with temperature as shown in the typical performance curve “Input Bias Current vs Tempera- ture.” Input Bias current also varies with common-mode voltage and power supply voltage. This variation is dependent on the voltage between the negative power supply and the common-mode input voltage. The effect is shown in the typical performance curve “Input Bias Current vs Common- Mode Voltage.” FIGURE 3. Photodetector Amplifier. R F 1M Ω 3.3pF V O = – RF ID I D λ OPA137 I D is proportional to light intensity (radiant power) Photodiode BPW34 C D = 75pF OPA137 V IN V OUT I OVERLOAD 2mA max V– V+ Inputs are internally clamped to V+ and V– R 1 0.1 Ω R 2 1k Ω R 3 10k Ω OPA241 V O = I L OPA137 20pF Load Ground-referred output V O V+ R 1 R3 R 2 Zetex Darlington ZTX712 |
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