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OPA635 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA635 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 18 page  OPA634, OPA635 11 SBOS097A APPLICATIONS INFORMATION WIDEBAND VOLTAGE FEEDBACK OPERATION The OPA634 and OPA635 are unity-gain stable, very high- speed voltage feedback op amps designed for single supply operation (+3V to +10V). The input stage supports input voltages below ground, and to within 1.2V of the positive supply. The complementary common-emitter output stage provides an output swing to within 30mV of ground and 140mV of the positive supply. They are compensated to provide stable operation with a wide range of resistive loads. The OPA635’s internal disable circuitry is designed to minimize supply current when disabled. Figure 1 shows the AC-coupled, gain of +2 configuration used for the +5V Specifications and Typical Performance Curves. For test purposes, the input impedance is set to 50 Ω with a resistor to ground. Voltage swings reported in the Specifications are taken directly at the input and output pins. For the circuit of Figure 1, the total effective load on the output at high frequencies is 150 Ω || 1500Ω. The disable pin needs to be driven by a low impedance source, such as a CMOS inverter. The 1.50k Ω resistors at the non-inverting input provide the common-mode bias voltage. Their parallel combination equals the DC resistance at the inverting input, (RF), minimizing the DC offset. SINGLE SUPPLY ADC CONVERTER INTERFACE The front page shows a DC-coupled, single-supply ADC (Analog-to-Digital Converter) driver circuit. Many systems are now requiring +3V supply capability of both the ADC and its driver. The OPA635 provides excellent performance in this demanding application. Its large input and output voltage ranges, and low distortion, support converters such as the ADS900 shown in this figure. The input level-shifting circuitry was designed so that VIN can be between 0V and 0.5V, while delivering an output voltage of 1V to 2V for the ADS900. Both the OPA635 and ADS900 have power reduc- tion pins with the same polarity for those systems that need to conserve power. Figure 2 shows the DC-coupled, gain of +2 configuration used for the +3V Specifications and Typical Performance Curves. For test purposes, the input impedance is set to 50 Ω with a resistor to ground. Though not strictly a “rail-to-rail” design, these parts come very close, while maintaining excellent performance. They will deliver ≈ 2.8Vp-p on a single +3V supply with 70MHz bandwidth. The 374 Ω and 2.26k Ω resistors at the input level-shift V IN so that VOUT is within the allowed output voltage range when VIN = 0. See the typical performance curves for information on driving capacitive loads. FIGURE 1. AC-Coupled Signal—Resistive Load to Supply Midpoint. FIGURE 2. DC-Coupled Signal—Resistive Load to Supply Midpoint. OPA63x +V S = 5V DIS (OPA635 only) V OUT 53.6 Ω V IN 1.50k Ω 1.50k Ω R L 150 Ω +V S 2 6.8 µF + 0.1 µF 0.1 µF 0.1 µF R F 750 Ω R G 750 Ω OPA63x +V S = 3V DIS (OPA635 only) V OUT 57.6 Ω V IN R F 750 Ω R G 562 Ω 374 Ω 2.26k Ω R L 150 Ω +V S 2 6.8 µF + 0.1 µF z |
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