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OPA692 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA692 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 27 page OPA3692 SBOS228E 11 www.ti.com APPLICATIONS INFORMATION WIDEBAND BUFFER OPERATION The OPA3692 gives the exceptional AC performance of a wideband, current-feedback op amp with a highly linear, high-power output stage. It features internal RF and RG resistors that make it easy to select a gain of +2, +1, or –1 without external resistors. Requiring only 5.1mA/ch quies- cent current, the OPA3692 swings to within 1V of either supply rail and delivers in excess of 160mA at room tempera- ture. This low output headroom requirement, along with supply voltage independent biasing, gives remarkable +5V single-supply operation. The OPA3692 will deliver greater than 200MHz bandwidth driving a 2Vp-p output into 100 Ω on a +5V single supply. Previous boosted output stage amplifi- ers have typically suffered from very poor crossover distor- tion as the output current goes through zero. The OPA3692 achieves a comparable power gain with much better linearity. Figure 1 shows the DC-coupled, gain of +2, dual power- supply circuit configuration used as the basis of the ±5V Electrical and Typical Characteristics. For test purposes, the input impedance is set to 50 Ω with a resistor to ground and the output impedance is set to 50 Ω with a series output resistor. Voltage swings reported in the specifications are taken directly at the input and output pins while load powers (dBm) are defined at a matched 50 Ω load. For the circuit of Figure 1, the total effective load will be 100 Ω || 804Ω = 89Ω. The disable control line (DIS) is typically left open to ensure normal amplifier operation. In addition to the usual power- supply decoupling capacitors to ground, a 0.1 µF capacitor can be included between the two power-supply pins. This optional capacitor typically improves the 2nd-harmonic dis- tortion performance by 3dB to 6dB. Figure 2 shows the AC-coupled, gain of +2, single-supply circuit configuration used as the basis of the +5V Electrical and Typical Characteristics. Though not a rail-to-rail design, the OPA3692 requires minimal input and output voltage headroom compared to other very wideband, current-feedback op amps. It will deliver a 3Vp-p output swing on a single +5V supply with greater than 150MHz bandwidth. The key requirement of broadband single-supply operation is to maintain input and output signal swings within the usable voltage ranges at both the input and the output. The circuit in Figure 2 establishes an input midpoint bias using a simple resistive divider from the +5V supply (two 806 Ω resistors). The input signal is then AC- coupled into this midpoint voltage bias. The input voltage can swing to within 1.5V of either supply pin, giving a 2Vp-p input signal range centered between the supply pins. The input impedance matching resistor (57.6 Ω) used for testing is ad- justed to give a 50 Ω input match when the parallel combination of the biasing divider network is included. The gain resistor (RG) is AC-coupled, giving the circuit a DC gain of +1, which puts the input DC bias voltage (2.5V) on the output as well. Again, on a single +5V supply, the output voltage can swing to within 1V of either supply pin while delivering more than 120mA output current. A demanding 100 Ω load to a midpoint bias is used in this characterization circuit. The new output stage used in the OPA3692 can deliver large bipolar output currents into this midpoint load with minimal crossover distortion, as shown by the +5V supply, 3rd-harmonic distortion plots. Although Figure 2 shows a single +5V operation, this same circuit is suitable for applications up to a single +12V supply. 1/3 OPA3692 +5V –5V 50 Ω Load 50 Ω 50 Ω 50 Ω Source R G 402 Ω R F 402 Ω + 6.8 µF 0.1 µF + 6.8 µF 0.1 µF DIS V IN 1/3 OPA3692 +5V +V S DIS V S/2 806 Ω 100 Ω V O V IN 806 Ω R G 402 Ω R F 402 Ω 0.1 µF 0.1 µF + 6.8 µF 0.1 µF 50 Ω Source 57.6 Ω FIGURE 1. DC-Coupled, G = +2, Bipolar Supply, Specifica- tion and Test Circuit. FIGURE 2. AC-Coupled, G = +2, Single-Supply Specification and Test Circuit. VIDEO RGB AMPLIFIER The front page shows an RGB amplifier based on the OPA3692. The package pinout supports a signal flow-through printed circuit board (PCB). The internal resistors simplify the PCB even more, while maintaining good gain accuracy. For systems that need to conserve power, the total supply current for the disabled OPA3692 is only 450 µA. This triple op amp could also be used to drive triple video ADCs to digitize component video. |
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