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SBOU006 Datasheet(PDF) 13 Page - Texas Instruments |
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SBOU006 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 33 page  OPA3691 13 www.ti.com SBOS227E TRIPLE ADC BUFFER CHANNEL The OPAx691 family is ideally suited to single-supply, wideband ADC driving. A current-feedback op amp is ideal where high gains with high bandwidths are required. The wide 3Vp-p output swing with over 150MHz full-power band- width on a single +5V supply is well suited to the 2Vp-p input range commonly required from modern CMOS pipelined ADCs. Three channels of very high-speed digitizer channels are shown in Figure 3 using the OPA3691 driving three ADS831s (8-bit, 80MSPS CMOS converters). Each input is AC-coupled into a 50 Ω gain resistor that also will act as a 50 Ω impedance match at high frequencies. The amplifier’s inputs and outputs are centered on the ADC common-mode input voltage by tying each converter’s VCM to the noninverting inputs of the amplifier. This VCM acts as the swing midpoint for the input to the converter. Since the ADS831 can operate with differential inputs, driving into the IN input will give a net noninverting signal channel even with the amplifiers operat- ing at an inverting gain of –6. The other input to the ADS831 is tied to this VCM as well to give an input signal midpoint equal to VCM. The 300Ω feedback resistor will be the output load in this configuration. Harmonic distortion for the OPA3691 will not degrade the converter’s SFDR performance in this application. WIDEBAND RGB MULTIPLEXER The OPA3691 is ideally suited to implementing a simple, very wideband, 2x1 RGB multiplexer. This simple wired-OR video multiplexer can be easily implemented using the circuit shown in Figure 4. This circuit uses two OPA3691s where each package accepts the three RGB component video signals from one of two possible sources. Each noninverting input is terminated in 75 Ω FIGURE 4. Wideband 2x1 RGB Multiplexer. FIGURE 3. Triple-Channel ADC Driver. 1/3 OPA3691 22 Ω 300 Ω 50 Ω 0.1 µF 300 Ω 0.1 µF 47pF V 1 ADS831 8-Bit 80MSPS IN V CM IN 1/3 OPA3691 22 Ω 300 Ω 50 Ω 0.1 µF 300 Ω 0.1 µF 47pF V 1 ADS831 8-Bit 80MSPS IN V CM IN 1/3 OPA3691 22 Ω 300 Ω 50 Ω 0.1 µF 300 Ω 0.1 µF 47pF V 1 ADS831 8-Bit 80MSPS IN V CM IN +5V Power-supply decoupling not shown. 1/3 OPA3691 340 Ω 402 Ω 75 Ω 82.5 Ω V OUT Red 75 Ω Line R1 +5V +5V –5V 1/3 OPA3691 340 Ω 402 Ω 75 Ω 82.5 Ω V OUT Green 75 Ω Line G1 1/3 OPA3691 340 Ω 402 Ω 75 Ω 82.5 Ω V OUT Blue 75 Ω Line B1 1/3 OPA3691 340 Ω 402 Ω 75 Ω 82.5 Ω R2 +5V –5V 1/3 OPA3691 340 Ω 402 Ω 75 Ω 82.5 Ω G2 1/3 OPA3691 340 Ω 402 Ω 75 Ω 82.5 Ω B2 V DIS U1 U2 Power-supply decoupling not shown. |
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