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OPA2690 Datasheet(PDF) 16 Page - Burr-Brown (TI) |
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OPA2690 Datasheet(HTML) 16 Page - Burr-Brown (TI) |
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16 / 31 page  www.ti.com 1/3 OPA3693 +5V DIS 50W V O R F 300W R G 300W R M 60.4W + 6.8 F m 0.1 F m 50 Load W -5V + 6.8 F m 0.1 F m 50 Source W V I SINGLE-SUPPLY OPERATION 1/3 OPA3693 +5V +V S DIS V /2 S 604W 100W V O V I 604W R G 300W R F 300W 1000pF 1000pF + 6.8 F m 0.1 F m 50 Source W 60.4W OPA3693 SBOS353 – DECEMBER 2006 Figure 44 shows the DC-coupled, gain of –1V/V in the single +5V Typical Characteristic curves, the buffer configuration used as a starting point for the OPA3693 provides > 300MHz bandwidth driving a gain of –1V/V Typical Characteristic curves. The 3VPP swing into a 100Ω load. The key requirement of input impedance is set to 50 Ω using the parallel broadband single-supply operation is to maintain combination of an external 60.4 Ω resistor and the input and output signal swings within the useable internal 300 Ω R G resistor. The noninverting input is voltage ranges at both the input and the output. tied directly to ground. Since the internal design for The circuit of Figure 45 shows the AC-coupled, gain the OPA3693 is current-feedback, trying to get of +2V/V, video buffer circuit used as the basis for improved dc accuracy by including a resistor on the the Electrical Characteristics table and Typical noninverting input to ground is ineffective. Using a Characteristics curves. The circuit of Figure 45 direct short to ground on the noninverting input establishes an input midpoint bias using a simple reduces both the contribution of the dc bias current resistive divider from the +5V supply (two 604 Ω and noise current to the output error. While the resistors). The input signal is then AC-coupled into external 60.4 Ω is used here to match to the 50Ω this midpoint voltage bias. The input voltage can source from the test equipment, the maximum input swing to within 1.6V of either supply pin, giving a impedance in this configuration is limited to the 300 Ω 1.8VPP input signal range centered between the R G resistor even with the R M resistor removed. supply pins. The input impedance matching resistor Unlike the noninverting unity gain buffer application, (60.4 Ω) used for testing is adjusted to give a 50Ω removing R M does not strongly impact the dc input match when the parallel combination of the operating point because the short on the biasing divider network is included. The gain resistor noninverting input of Figure 44 provides the dc (RG) is AC-coupled, giving the circuit a dc gain of operating voltage. This application of the OPA3693 +1V/V, which puts the input dc bias voltage (2.5V) on provides a very broadband, high-output, signal the output as well. Again, on a single +5V supply, the inverter. output voltage can swing to within 1V of either supply pin while delivering more than 85mA output current. A demanding 100 Ω load to a midpoint bias is used in this characterization circuit. The new output stage used in the OPA3693 can deliver large bipolar output current into this midpoint load with minimal crossover distortion, as illustrated by the +5V supply, 3rd-harmonic distortion plots. Figure 44. DC-Coupled, G = –1V/V, Bipolar-Supply Specification and Test Circuit The OPA3693 may be used over a single-supply range of +3.5V to +12V. Though not a rail-to-rail Figure 45. AC-Coupled, G = +2V/V, Single-Supply output design, the OPA3693 requires minimal input Specification and Test Circuit and output voltage headroom compared to other very-wideband video buffer amplifiers. As illustrated 16 Submit Documentation Feedback |
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